An air fryer

Abstract

The application discloses an air fryer, which comprises a shell with a cooking cavity, a bottom heating device located below the cooking cavity, an air fryer assembly in the cooking cavity, a heat transfer cover plate arranged above the bottom heating device, the heat transfer cover plate constituting at least part of the bottom wall of the cooking cavity, the heat transfer cover plate being spaced apart from the air fryer assembly, the heat transfer cover plate comprising a central recess and a flange portion surrounding the outer periphery of the recess, and the recess being recessed downward relative to the flange portion. The recessed design of the recess in the application shortens the distance between the recess and the bottom heating device, which is conducive to the rapid conduction or radiation of the heat generated by the bottom heating device to the central recess and the rapid heat transfer from the recess to the flange portion, the flange portion being close to the bottom of the air fryer assembly, so that the heat transfer to the bottom of the air fryer assembly can be realized in a short time, the bottom of the air fryer assembly is heated, and then the uniform heating of food materials is facilitated, and the cooking effect is improved.

Description

Technical Field

[0001] This application belongs to the field of household appliance technology, specifically relating to an air fryer. Background Technology

[0002] Existing air fryers typically have an upper heating element located above the cooking chamber. This upper heating element includes a heating element, a fan, and a motor that drives the fan. The heating element generates heat during operation, and the fan, driven by the motor, rotates to blow this heat into the cooking chamber to heat the food. However, this simple upper heating method results in most of the heat being transferred to the top surface of the food, leading to overheating of the top surface and underheating of the bottom surface. This uneven heating affects the cooking results.

[0003] To improve the baking effect on the bottom surface of food, some air fryers have added bottom heating devices. Currently, there are two common types of bottom heating devices: one uses a one-piece die-cast heating element to an aluminum plate, or a one-piece brazed heating element to an aluminum plate, or a heating element riveted to an aluminum plate, to wrap or clamp the heating element inside the aluminum plate. When the air fryer is removed, the user sees a complete heating plate structure, which has good integrity and texture, and also makes it easy for users to wipe away food residue or grease dripping onto the heating plate, making cleaning convenient. However, this type of heating plate is expensive and difficult to popularize. The other type uses a heating element directly exposed at the bottom of the cooking cavity to heat the food. This method means that the user can see the heating element directly after removing the air fryer. It has poor integrity, and food residue or grease dripping onto the heating element is not easy to clean. Moreover, after cooking, the residual temperature on the surface of the heating element is still high, and the direct exposure of the heating element also poses certain safety hazards.

[0004] Furthermore, existing technologies propose a structure that adds a cover plate above the bottom heating element. This cover plate prevents oil and other impurities from dripping onto the heating element, facilitating cleaning. However, existing covers are generally thin, horizontally positioned plates. Since the distance between the fryer assembly and the bottom heating element is fixed, if the cover plate is close to or against the heating element, its temperature rise rate is rapid, but due to the large distance between it and the fryer assembly, its heat transfer performance to the fryer assembly is poor, resulting in ineffective heating of the food. Conversely, if the cover plate is positioned close to the fryer assembly but far from the heating element, its temperature rise rate is slower, also leading to poor heat transfer performance to the fryer assembly. Therefore, there is an urgent need for a bottom heating structure that is easy to clean and provides good heating performance. Utility Model Content

[0005] This application provides an air fryer to solve the technical problem that existing air fryers using bottom heating elements, when adding a horizontal cover plate above the heating element to solve the problem of difficult cleaning, are unable to achieve a balance between the distance between the cover plate and the fryer assembly, and between the cover plate and the heating element, resulting in poor heat transfer performance of the cover plate to the fryer assembly and poor cooking effect of the food.

[0006] The technical solution adopted in this application is as follows:

[0007] An air fryer includes a housing having a cooking chamber and a bottom heating device located below the cooking chamber, the cooking chamber having an air fryer assembly, and a heat transfer cover plate disposed above the bottom heating device. The heat transfer cover plate forms at least a portion of the bottom wall of the cooking chamber. The heat transfer cover plate is spaced apart from the air fryer assembly. The heat transfer cover plate includes a central recess and a flanged portion surrounding the outer periphery of the recess. The recess is close to the bottom heating device, and the flanged portion is close to or abuts against the air fryer assembly.

[0008] This application adds a heat transfer cover plate above the bottom heating element. Because of the cover plate, food residue and grease dripping during cooking will not fall onto the bottom heating element but will be caught by the cover plate. After cooking, users can directly wipe and wash the cover plate, significantly reducing the difficulty and burden of cleaning and improving the user experience. Furthermore, the cover plate conceals the bottom heating element, preventing it from being exposed. Even if the bottom heating element remains warm after cooking, users will not directly touch it, thus avoiding burns.

[0009] Compared to the horizontal cover plates in existing technologies, the heat transfer cover plate in this application features a central recessed portion that is recessed downwards relative to the outer flanged portion. The recessed portion is closer to the bottom heating device, and the flanged portion is closer to or abuts against the fryer assembly. The recessed design shortens the distance between the recessed portion and the bottom heating device, facilitating rapid heat conduction or radiation from the bottom heating device to the central recessed portion. Furthermore, because the heat transfer cover plate is made of a material with good thermal conductivity, the recessed portion, which heats up first, will quickly transfer heat to the flanged portion located around it, allowing the entire heat transfer cover plate to reach a higher temperature in a short time. Compared to the recessed portion, the flanged portion is closer to the fryer assembly, so the heat from the flanged portion can also be quickly transferred to the food on the fryer assembly, helping to achieve bottom heating of the food in a shorter time. Combined with the function of the top heating device of the air fryer, the food can be heated evenly, thereby improving the cooking effect. Therefore, the heat transfer cover plate in this application has better heat transfer performance for the fryer assembly. From another perspective, the stepped structure formed by the recessed portion and the flanged portion of the heat transfer cover plate in this application also helps to improve the structural strength of the heat transfer cover plate and reduce the probability of deformation under external force and preferential heating of the recessed portion.

[0010] The flanged portion has an outer ring portion and an inner ring portion connecting the outer ring portion and the recessed portion. The inner ring portion is arranged inclined downward from the outside to the inside to form a guide surface on the upper surface of the inner ring portion.

[0011] During food cooking, some food residue, seasonings, and grease from the food itself drip down onto the heat transfer cover. In this technical solution, the inclined arrangement of the inner ring creates a guide surface on its upper surface. On one hand, this allows condensed water droplets and oil stains to flow downwards along the guide surface and accumulate in the recessed area, reducing the contamination area of ​​the heat transfer cover and facilitating centralized cleaning after cooking. On the other hand, the inclined arrangement of the inner ring avoids cleaning dead corners, allowing for thorough cleaning and preventing dirt accumulation. Furthermore, the inclination of the inner ring relative to the outer ring increases the structural strength of the flange, thereby improving the overall structural strength of the heat transfer cover, reducing the probability of deformation under stress, and extending the service life of the heat transfer cover.

[0012] The bottom wall of the cooking cavity is provided with a support portion for supporting the fryer assembly on the outside of the heat transfer cover plate, and the top surface of the support portion is higher than the top surface of the outer ring portion.

[0013] In this technical solution, the top surface of the support part is higher than the top surface of the outer ring part, allowing the entire weight of the fryer assembly to be supported by the support part. The heat transfer cover becomes a non-load-bearing component, thus enabling a thinner design. This improves the heat transfer performance of the heat transfer cover, allowing the heat generated by the bottom heating device to be transferred more efficiently to the cooking cavity, thereby enhancing the hot air circulation within the cooking cavity. Furthermore, because the top surface of the support part is higher than the top surface of the outer ring part, during cooking, some dripping food residue and grease can roll more smoothly onto the heat transfer cover, facilitating the accumulation of contaminants and making cleaning easier for the user. Furthermore, in this technical solution, the top surfaces of the supporting part, the outer ring part, the inner ring part, and the recessed part exhibit progressively different heights, thus forming a stepped structure that gradually decreases from the outside to the inside between the bottom wall of the cooking cavity and the bottom wall of the fryer assembly. This stepped structure creates a heat storage zone between the top surface of the heat transfer cover and the bottom wall of the fryer assembly. The existence of this heat storage zone can, on the one hand, store heat, allowing the heat to be distributed and transferred more evenly to the bottom of the fryer assembly, making the food heated more evenly during cooking; on the other hand, it can reduce the loss of heat to the outside of the fryer assembly through the supporting part, reducing energy waste.

[0014] There is a heat insulation gap between the lower surface of the recess and the bottom heating device.

[0015] If the lower surface of the recessed area is in direct contact with the bottom heating device, the heat generated by the bottom heating device will be directly transferred to the recessed area through contact heat transfer, causing the recessed area to heat up rapidly. Over time, this can easily lead to damage to the recessed area due to thermal stress, such as deformation and bulging, reducing the service life of the heat transfer cover. In this technical solution, there is a heat insulation gap between the lower surface of the recessed area and the bottom heating device. After the bottom heating device generates heat, it transfers heat to the recessed area through thermal radiation, making the heating of all areas of the recessed area more uniform. This reduces the probability of deformation caused by excessive local temperature in the recessed area and extends the service life of the heat transfer cover. Moreover, after the bottom heating device stops operating, it will still retain residual heat. The presence of the heat insulation gap helps dissipate heat between the recessed area and the bottom heating device, thereby reducing the risk of burns when users touch the recessed area.

[0016] Below the cooking cavity is a mounting cavity for accommodating the bottom heating device. The heat transfer cover plate covers the mounting cavity and has a positioning part extending toward the inside of the mounting cavity. The inner wall of the mounting cavity protrudes to form a support step, and the positioning part abuts against the support step.

[0017] This technical solution houses the bottom heating device within the installation cavity and covers it with a heat transfer cover, providing a relatively enclosed space for the device. This reduces the entry of oil, water, food residue, dust, etc., into the installation cavity, effectively protecting the bottom heating device. To improve the heat transfer performance of the heat transfer cover, its thickness is typically designed to be thin. However, this introduces the risk of hollowing, deformation, or collapse when the user presses the cover. Therefore, this solution utilizes support steps formed on the inner wall of the installation cavity to support the positioning part of the heat transfer cover. This disperses the pressure on the cover, preventing deformation or damage caused by pressure concentration and extending its service life. Furthermore, the design of the support steps and positioning part provides clear guidance and positioning for the installation of the heat transfer cover, making the installation process simpler and faster, reducing installation difficulty and error rates, and improving production efficiency.

[0018] The bottom heating device includes a heating element, and a support block for supporting the heating element is protruding from the bottom of the mounting cavity. There are multiple support steps, and at least some of the support steps are connected to the support block.

[0019] In this technical solution, the design of the support block at the bottom of the mounting cavity raises the position of the heating element. This allows the heating element to be closer to the heat transfer cover, improving the heat transfer efficiency from the heating element to the cover. Furthermore, it reduces the contact area between the heating element and the bottom wall of the mounting cavity, decreasing heat transfer and allowing more heat to be transferred to the cover, thus improving thermal efficiency and reducing energy waste. The support block also provides a stable support point for the heating element, ensuring its stability during operation and reducing the risk of poor contact or damage due to shaking or displacement. Connecting at least part of the support step to the support block allows for extension of the support step height using the block's height, saving materials and reducing costs. Compared to solutions that separately install support steps in other areas of the mounting cavity's inner wall, this simplifies the cavity design and reduces manufacturing complexity.

[0020] The positioning part includes an annular body and a support protrusion protruding downward from the body, and the positioning part abuts against the support step through the support protrusion.

[0021] Compared to the technical solution of extending the entire ring-shaped body downwards to abut against the supporting steps, this technical solution saves materials and reduces costs by setting a separate supporting protrusion at the bottom of the body.

[0022] The housing has a mounting cavity for accommodating the bottom heating device. The heat transfer cover plate covers the mounting cavity and has a positioning part extending toward the mounting cavity. The positioning part is connected to the side wall of the mounting cavity by fasteners.

[0023] In this technical solution, the positioning part of the heat transfer cover extends towards the installation cavity and mates with the side wall of the installation cavity, providing precise positioning for the installation of the heat transfer cover. This ensures the accurate relative position of the heat transfer cover with the bottom heating device and the cooking cavity, improving installation precision. Compared to other installation methods, connecting the positioning part to the side wall of the installation cavity using fasteners simplifies the structural design of both the positioning part and the side wall of the installation cavity, facilitates assembly, and allows the heat transfer cover to form a robust whole with the housing, enhancing structural stability.

[0024] The mounting cavity has a slot and a first fixing hole on its side wall, and the positioning part has a insert and a second fixing hole. One end of the heat transfer cover is inserted into the slot through the insert, and the fastener passes through the first fixing hole and the second fixing hole to fix the other end of the heat transfer cover to the side wall of the mounting cavity.

[0025] In this technical solution, the cooperation between the insert and the slot enables rapid positioning and initial fixation of one end of the heat transfer cover, ensuring that the heat transfer cover will not shift or misalign during subsequent installation and guaranteeing the accurate relative position of the heat transfer cover and the mounting cavity. After fixing one end of the heat transfer cover with the insert, the other end of the heat transfer cover is fixed to the side wall of the mounting cavity with fasteners, which greatly improves assembly efficiency. Moreover, after the heat transfer cover is fixed as a whole, it can form a stable connection structure with the shell, preventing the heat transfer cover from shaking or shifting during use.

[0026] The positioning part is provided with a limiting hole near the second fixing hole, and the side wall of the mounting cavity is provided with a limiting protrusion near the first fixing hole. The limiting protrusion engages with the limiting hole.

[0027] Based on the initial positioning after the insert and slot are engaged, the engagement of the limiting protrusion and the limiting hole in this technical solution provides secondary positioning for the installation process of the heat transfer cover plate. This ensures that the heat transfer cover plate will not shift or misalign before the fasteners are installed into the first and second fixing holes. This not only ensures the accurate relative position of the heat transfer cover plate and the mounting cavity, but also improves the assembly efficiency between the two. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of an air fryer without the fryer components according to one embodiment of this application;

[0030] Figure 2 This is a schematic diagram of an air fryer according to one embodiment of this application, excluding the fryer components and the heat transfer cover plate.

[0031] Figure 3 This application provides a three-dimensional heat transfer cover plate according to one embodiment. Figure 1 ;

[0032] Figure 4 This application provides a three-dimensional heat transfer cover plate according to one embodiment. Figure 2 ;

[0033] Figure 5 This application provides a three-dimensional representation of the base plate in one embodiment. Figure 1 ;

[0034] Figure 6 This application provides a three-dimensional representation of the base plate in one embodiment. Figure 2 .

[0035] in,

[0036] 1. Heat transfer cover plate; 11. Recessed part; 12. Flanged part; 121. Outer ring part; 122. Inner ring part; 13. Body; 14. Support protrusion; 15. Insert plate; 16. Positioning plate; 161. Second fixing hole; 162. Limiting hole;

[0037] 2. Base plate; 21. Mounting cavity; 22. Support block; 23. Support step; 24. Slot; 25. Limiting protrusion; 26. Support part; 27. Guide structure; 28. First fixing hole;

[0038] 3. Heating element; 31. Heating section;

[0039] 4. Shell. Detailed Implementation

[0040] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0042] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0045] like Figure 1 and Figure 2 As shown, an air fryer includes a shell 4 having a cooking cavity and a bottom heating device located below the cooking cavity. The cooking cavity has an air fryer assembly and also includes a heat transfer cover 1 covering the bottom heating device. The heat transfer cover 1 forms at least a portion of the bottom wall of the cooking cavity. The heat transfer cover 1 is spaced apart from the air fryer assembly. The heat transfer cover 1 includes a central recess 11 and a flange 12 surrounding the outer periphery of the recess 11. The recess 11 is recessed downward relative to the flange 12. The recess 11 is close to the bottom heating device, and the flange 12 is close to or abuts against the air fryer assembly.

[0046] In a preferred embodiment, such as Figure 1 , Figures 3 to 6 As shown, the housing 4 includes a bottom plate 2 and a heat transfer cover plate 1, which cooperate with each other to form the bottom wall of the cooking cavity.

[0047] This application does not limit the material of the heat transfer cover plate 1, which can be an aluminized plate, a galvanized plate, an aluminum plate or a stainless steel plate.

[0048] This application adds a heat transfer cover 1 above the bottom heating element. Because of the heat transfer cover 1, food residue and grease dripping during cooking will not fall onto the bottom heating element but will be caught by the heat transfer cover 1. After cooking, users can directly wipe and wash the heat transfer cover 1, significantly reducing the difficulty and burden of cleaning and improving the user experience. Furthermore, the heat transfer cover 1 covers the bottom heating element, preventing it from being exposed. Even if the bottom heating element retains residual heat after cooking, users will not directly touch it, thus avoiding burns.

[0049] Compared to the horizontal cover plates in the prior art, the heat transfer cover plate 1 in this application is designed with a central recessed portion 11 that is recessed downward relative to the outer flanged portion 12. The recessed design of the recessed portion 11 shortens the distance between the recessed portion 11 and the bottom heating device, which is conducive to the rapid conduction or radiation of the heat generated by the bottom heating device to the central recessed portion 11. Since the heat transfer cover plate 1 is made of a material with good thermal conductivity, the recessed portion 11, which heats up first, will quickly transfer heat to the flanged portion 12 located around it, so that the heat transfer cover plate 1 as a whole reaches a high temperature in a short time. Compared to the recessed portion 11, the flanged portion 12 is closer to the air fryer assembly, so the heat of the flanged portion 12 can also be quickly transferred to the food on the air fryer assembly, which helps to achieve bottom heating of the food in a shorter time. Combined with the function of the top heating device of the air fryer, the food can be heated evenly, thereby improving the cooking effect. Therefore, the heat transfer cover plate 1 in this application has better heat transfer performance for the air fryer assembly. From another perspective, the stepped structure formed by the recessed portion 11 and the flanged portion 12 of the heat transfer cover plate 1 in this application also helps to improve the structural strength of the heat transfer cover plate and reduce the probability of deformation under external force and preferential heating of the recessed portion.

[0050] As a preferred embodiment of this application, such as Figure 2 As shown, the bottom heating device includes a heating element 3, which extends in a meandering manner and has at least a heating section 31 located directly below the central region of the recess 11. By arranging the heating section 31 directly below the central region of the recess 11, the temperature rise rate of the central region of the recess 11 can be further increased, thus improving the problem of low temperature in the central region of the cooking cavity caused by the top heating device.

[0051] In this application, the relative positional relationship between the recessed portion 11 and the bottom heating device can be any of the following embodiments:

[0052] Implementation method 1: The lower surface of the recessed part 11 abuts against the bottom heating device.

[0053] Implementation Method Two: A heat-insulating gap exists between the lower surface of the recessed portion 11 and the bottom heating device. With this configuration, the bottom heating device generates heat and transfers it to the recessed portion 11 via thermal radiation, ensuring uniform heating across all areas of the recessed portion 11. This reduces the probability of deformation due to localized overheating and extends the service life of the heat transfer cover plate 1. Furthermore, even after the bottom heating device stops operating, it retains residual heat. The heat-insulating gap helps dissipate heat between the recessed portion 11 and the bottom heating device, thereby reducing the risk of burns when a user touches the recessed portion 11.

[0054] During food cooking, some food residue, seasonings, and oils released from the food itself will drip down onto the heat transfer cover plate 1. As a preferred embodiment of this application, such as... Figure 1 , Figure 3 and Figure 4 As shown, the flanged portion 12 has an outer ring portion 121 and an inner ring portion 122 connecting the outer ring portion 121 and the recessed portion 11. The inner ring portion 122 is arranged inclined downward from the outside to the inside to form a guide surface on the upper surface of the inner ring portion 122. The presence of the guide surface has two advantages. First, it facilitates the downward flow of condensed water droplets and oil stains during cooking, allowing them to accumulate in the recessed portion 11, reducing the contamination area of ​​the heat transfer cover plate 1 and making it easier for users to clean the heat transfer cover plate 1 centrally after cooking. Second, the inclined arrangement of the inner ring portion 122 avoids the existence of cleaning dead corners, making it easier for users to thoroughly clean the heat transfer cover plate 1, thus preventing the accumulation of dirt. Furthermore, the inclination of the inner ring portion 122 relative to the outer ring portion 121 can, to a certain extent, improve the structural strength of the flanged portion 12, thereby improving the overall structural strength of the heat transfer cover plate 1, reducing the probability of deformation under stress, and extending the service life of the heat transfer cover plate 1.

[0055] The bottom wall of the cooking cavity has a support for supporting the fryer assembly on the outside of the heat transfer cover.

[0056] In one embodiment, the top surface of the support portion is flush with the top surface of the outer ring portion.

[0057] In a preferred embodiment, such as Figure 1As shown, the top surface of the support portion 26 is higher than the top surface of the outer ring portion 121. In this embodiment, the top surface of the support portion 26 is higher than the top surface of the outer ring portion 121, which allows the weight of the entire fryer assembly to be supported by the support portion 26. The heat transfer cover plate 1 becomes a non-load-bearing component, so the heat transfer cover plate 1 can be designed to be thinner, thereby helping to improve the heat transfer performance of the heat transfer cover plate 1. This allows the heat generated by the bottom heating device to be transferred to the cooking cavity more efficiently, thereby improving the hot air circulation effect in the cooking cavity. Moreover, since the top surface of the support portion 26 is higher than the top surface of the outer ring portion 121, during the cooking process, some dripping food residue and grease can roll off more smoothly onto the heat transfer cover plate 1, realizing the accumulation of dirt and facilitating user cleaning. Furthermore, in this embodiment, the top surface of the support portion 26, the top surface of the outer ring portion 121, the top surface of the inner ring portion 122, and the top surface of the recessed portion 11 present a series of height differences, thereby forming a stepped structure that gradually decreases from the outside to the inside between the bottom wall of the cooking cavity and the bottom wall of the fryer assembly. This stepped structure creates a heat storage zone between the top surface of the heat transfer cover plate 1 and the bottom wall of the fryer assembly. The existence of this heat storage zone can, on the one hand, store heat, so that the heat can be more evenly distributed and transferred to the bottom of the fryer assembly, making the food more evenly heated during the cooking process; on the other hand, it can reduce the heat loss to the outside of the fryer assembly through the support portion, thus reducing energy waste.

[0058] As a preferred embodiment of this implementation, such as Figure 1 As shown, the top surface of the support 26 is provided with a guide structure 27 for guiding the fryer assembly into and out. The design of the guide structure 27 not only provides guidance for the fryer assembly to move in and out, but also provides clear guidance for the placement of the fryer assembly in the cooking cavity, preventing the fryer assembly from being misaligned after placement, and ensuring that the relative positions of the fryer assembly, the heat transfer cover plate 1 and the bottom heating device are accurate, thereby ensuring that the food is heated evenly.

[0059] As a preferred embodiment of this application, such as Figures 1 to 3 , Figure 5 and Figure 6 As shown, a mounting cavity 21 for accommodating a bottom heating device is provided below the cooking cavity. A heat transfer cover 1 covers the mounting cavity 21. The heat transfer cover 1 has a positioning part extending toward the inside of the mounting cavity 21. The inner wall of the mounting cavity 21 protrudes to form a support step 23, and the positioning part abuts against the support step 23.

[0060] In this embodiment, the bottom heating device is housed within the mounting cavity 21 and covered by the heat transfer cover plate 1, thus providing a relatively enclosed space for the bottom heating device. This reduces the entry of oil, water, food residue, dust, etc., into the mounting cavity 21, effectively protecting the bottom heating device. To improve the heat transfer performance of the heat transfer cover plate 1, its thickness is generally designed to be relatively thin. However, this also introduces the risk of hollowing, deformation, or collapse when the user presses the heat transfer cover plate 1. Therefore, in this embodiment, the positioning part of the heat transfer cover plate 1 is supported by a support step 23 formed on the inner wall of the mounting cavity 21. This disperses the pressure on the heat transfer cover plate 1, preventing deformation or damage caused by pressure concentration and extending the service life of the heat transfer cover plate 1. Moreover, the design of the support step 23 and the positioning part provides clear guidance and positioning for the installation of the heat transfer cover plate 1, making the installation process simpler and faster, reducing installation difficulty and error rate, and improving production efficiency.

[0061] In this embodiment, the specific structure of the supporting steps can adopt any of the following embodiments:

[0062] Example 1: This example 1 is not illustrated. In this example 1, there are several support steps. At least some of the support steps are fixed to the bottom wall of the mounting cavity and extend upward to abut against the positioning part.

[0063] Example 2: This example 2 is not illustrated. In this example 2, there are several support steps. At least some of the support steps are fixed to the side wall of the mounting cavity and extend upward to abut against the positioning part.

[0064] Example 3: As Figure 5 and Figure 6 As shown, the bottom heating device includes a heating tube 3, and a support block 22 for supporting the heating tube 3 is protruding from the bottom of the mounting cavity 21. There are multiple support steps 23, and at least some of the support steps 23 are connected to the support block 22.

[0065] In this embodiment 3, the design of the bottom support block 22 of the mounting cavity 21 can raise the position height of the heating tube 3. On the one hand, it allows the heating tube 3 to be closer to the heat transfer cover plate 1, thereby improving the heat transfer efficiency from the heating tube 3 to the heat transfer cover plate 1. On the other hand, it can reduce the contact area between the heating tube 3 and the bottom wall of the mounting cavity 21, reducing the heat transfer from the heating tube 3 to the bottom wall of the mounting cavity 21, so that more heat can be transferred to the heat transfer cover plate 1, thereby improving the thermal energy utilization rate and reducing energy waste. Moreover, the support block 22 can provide a stable support point for the heating tube 3, ensuring the stability of the heating tube 3 during operation and reducing the risk of poor contact or damage caused by the shaking or displacement of the heating tube 3. Connecting at least part of the support step 23 to the support block 22 can extend the height of the support step 23 by means of the height of the support block 22 itself, which helps to save materials and reduce costs. Moreover, compared with the technical solution of separately setting the support step 23 in other areas of the inner wall of the mounting cavity 21, it can simplify the design of the mounting cavity 21, thereby reducing the processing difficulty of the mounting cavity 21.

[0066] In this embodiment, the specific structure of the positioning part can adopt any of the following embodiments:

[0067] Example 4: This example 4 is not illustrated. In this example 4, the positioning part includes an annular body. The body is fixed to the outer periphery of the flange and extends downward along the entire circumference of the flange. The body abuts against the support step to support the heat transfer cover plate.

[0068] Example 5: Figure 3 As shown, the positioning part includes an annular body 13 and a support protrusion 14 protruding downward from the body 13. The positioning part abuts against the support step 23 through the support protrusion 14. Compared with embodiment 4, this embodiment 5 saves materials and reduces costs by providing a separate support protrusion 14 below the body 13.

[0069] The heat transfer cover plate 1 in this application can be installed using any of the following embodiments:

[0070] Embodiment Three: This embodiment three is not illustrated. In this embodiment three, the shell has a mounting cavity for accommodating the bottom heating device. A heat transfer cover plate covers the mounting cavity. The flanged portion of the heat transfer cover plate has several magnetic elements spaced along its circumference. The top opening of the mounting cavity has a stepped portion for supporting the heat transfer cover plate. The stepped portion has several mating parts spaced along its circumference that can magnetically engage with the magnetic elements, so that the heat transfer cover plate is magnetically attracted and fixed to the top opening of the mounting cavity. In this embodiment three, the heat transfer cover plate is easy and quick to install, and can be easily disassembled to facilitate thorough cleaning of the heat transfer cover plate and the joint gap between the heat transfer cover plate and the supporting portion, preventing dirt accumulation. Furthermore, after the heat transfer cover plate is disassembled, the bottom heating device inside the mounting cavity can be easily inspected and maintained.

[0071] Implementation Method Four: (e.g.) Figures 3 to 6 As shown, the housing 4 has a mounting cavity 21 for accommodating the bottom heating device. A heat transfer cover 1 covers the mounting cavity 21. The heat transfer cover 1 has a positioning part extending into the mounting cavity 21. The positioning part is connected to the side wall of the mounting cavity 21 by fasteners. The fasteners can be screws or rivets, for example. In this fourth embodiment, the positioning part of the heat transfer cover 1 extends into the mounting cavity 21 and cooperates with the side wall of the mounting cavity 21, providing precise positioning for the installation of the heat transfer cover 1. This ensures that the relative positions of the heat transfer cover 1, the bottom heating device, and the cooking cavity are accurate, thus improving installation accuracy. Compared to other installation methods, connecting the positioning part to the side wall of the mounting cavity 21 with fasteners simplifies the structural design of the positioning part and the side wall of the mounting cavity 21, facilitates assembly between the two, and makes the heat transfer cover 1 and the housing 4 form a solid whole, enhancing structural stability.

[0072] As a preferred embodiment of this fourth implementation method, such as Figures 3 to 6 As shown, the side wall of the mounting cavity 21 is provided with a slot 24 and a first fixing hole 28, and the positioning part is provided with a insert 15 and a second fixing hole 161. One end of the heat transfer cover plate 1 is inserted into the slot 24 through the insert 15, and the fastener passes through the first fixing hole 28 and the second fixing hole 161 to fix the other end of the heat transfer cover plate 1 to the side wall of the mounting cavity 21. In this embodiment, the cooperation between the insert 15 and the slot 24 can realize the quick positioning and initial fixation of one end of the heat transfer cover plate 1, ensuring that the heat transfer cover plate 1 will not shift or misalign during subsequent installation, and ensuring the accurate relative position of the heat transfer cover plate 1 and the mounting cavity 21. After fixing one end of the heat transfer cover plate 1 with the insert 15, the other end of the heat transfer cover plate 1 is fixed to the side wall of the mounting cavity 21 by the fastener, which greatly improves the assembly efficiency. Moreover, after the heat transfer cover plate 1 is fixed as a whole, it can form a stable connection structure with the shell 4, preventing the heat transfer cover plate 1 from shaking or shifting during use.

[0073] Specifically, such as Figures 3 to 5As shown, the positioning part includes an annular body 13 that is fixed to the outer periphery of the flange 12 and bent downwards. The insert 15 includes a vertical connecting part connected to the body 13 and a horizontal connecting part that is connected to the vertical connecting part and protrudes laterally. The slot 24 is adapted to the horizontal connecting part, and the horizontal connecting part is inserted into the slot 24 to achieve support and positioning of one end of the heat transfer cover plate 1. The positioning part also includes a positioning piece 16 that is connected to the body 13 and extends downwards. The insert 15 and the positioning piece 16 are located on two opposite sides of the body 13. The positioning piece 16 is provided with a second fixing hole 161, and the side wall of the mounting cavity 21 is provided with a first fixing hole 28 that is opposite to the position of the second fixing hole 161. After one end of the heat transfer cover plate 1 is fixed by the insert 15, the heat transfer cover plate 1 is rotated and pressed downwards with the insert 15 as the fulcrum to align the first fixing hole 28 and the second fixing hole 161. Then, fasteners are inserted into the first fixing hole 28 and the second fixing hole 161 to lock and fix the heat transfer cover plate 1 above the mounting cavity 21.

[0074] Furthermore, such as Figure 4 and Figure 6 As shown, a limiting hole 162 is provided near the second fixing hole 161 on the positioning part, and a limiting protrusion 25 is provided near the first fixing hole 28 on the side wall of the mounting cavity 21. The limiting protrusion 25 engages with the limiting hole 162. Combined with the initial positioning after the insert 15 and the slot 24 are engaged, the engagement of the limiting protrusion 25 and the limiting hole 162 provides secondary positioning for the installation process of the heat transfer cover 1, ensuring that the heat transfer cover 1 will not shift or misalign before the fasteners are installed to the first fixing hole 28 and the second fixing hole 161. This ensures the accurate relative position of the heat transfer cover 1 and the mounting cavity 21 and improves the assembly efficiency between the two. Of course, it is also possible to reverse this process, providing a limiting protrusion near the second fixing hole 161 on the positioning part and a limiting hole near the first fixing hole 28 on the side wall of the mounting cavity 21, with the limiting protrusion engaging with the limiting hole, to achieve the same secondary positioning effect during the installation of the heat transfer cover 1.

[0075] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0076] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. The above descriptions are merely embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. An air fryer, comprising a shell having a cooking cavity and a bottom heating device located below the cooking cavity, wherein the cooking cavity has an air fryer assembly, characterized in that, It also includes a heat transfer cover plate disposed above the bottom heating device, the heat transfer cover plate forming at least a portion of the bottom wall of the cooking cavity, the heat transfer cover plate being spaced apart from the fryer assembly, the heat transfer cover plate including a central recess and a flanged portion surrounding the outer periphery of the recess, the recess being close to the bottom heating device, and the flanged portion being close to or abutting against the fryer assembly.

2. An air fryer according to claim 1, characterized in that, The flanged portion has an outer ring portion and an inner ring portion connecting the outer ring portion and the recessed portion. The inner ring portion is arranged inclined downward from the outside to the inside to form a guide surface on the upper surface of the inner ring portion.

3. An air fryer according to claim 2, characterized in that, The bottom wall of the cooking cavity is provided with a support portion for supporting the fryer assembly on the outside of the heat transfer cover plate, and the top surface of the support portion is higher than the top surface of the outer ring portion.

4. An air fryer according to claim 1, characterized in that, There is a heat insulation gap between the lower surface of the recess and the bottom heating device.

5. An air fryer according to claim 1, characterized in that, Below the cooking cavity is a mounting cavity for accommodating the bottom heating device. The heat transfer cover plate covers the mounting cavity and has a positioning part extending toward the inside of the mounting cavity. The inner wall of the mounting cavity protrudes to form a support step, and the positioning part abuts against the support step.

6. An air fryer according to claim 5, characterized in that, The bottom heating device includes a heating element, and a support block for supporting the heating element is protruding from the bottom of the mounting cavity. There are multiple support steps, and at least some of the support steps are connected to the support block.

7. An air fryer according to claim 5, characterized in that, The positioning part includes an annular body and a support protrusion protruding downward from the body, and the positioning part abuts against the support step through the support protrusion.

8. An air fryer according to claim 1, characterized in that, The housing has a mounting cavity for accommodating the bottom heating device. The heat transfer cover plate covers the mounting cavity and has a positioning part extending toward the mounting cavity. The positioning part is connected to the side wall of the mounting cavity by fasteners.

9. An air fryer according to claim 8, characterized in that, The mounting cavity has a slot and a first fixing hole on its side wall, and the positioning part has a insert and a second fixing hole. One end of the heat transfer cover is inserted into the slot through the insert, and the fastener passes through the first fixing hole and the second fixing hole to fix the other end of the heat transfer cover to the side wall of the mounting cavity.

10. An air fryer according to claim 9, characterized in that, The positioning part is provided with a limiting hole near the second fixing hole, and the side wall of the mounting cavity is provided with a limiting protrusion near the first fixing hole. The limiting protrusion engages with the limiting hole.

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