Air fryer with good heating effect

Abstract

The air fryer with the good heating effect comprises a machine shell provided with an assembly cavity and a fryer assembly, an opening communicated with the assembly cavity is formed in one side of the machine shell, the fryer assembly enters and exits the assembly cavity through the opening, heat dissipation holes are formed in the bottom of the machine shell, and a heating assembly is arranged at the bottom of the assembly cavity. The heating assembly comprises a metal bottom plate arranged at the bottom of the assembly cavity and a PTC heating element arranged on the side, facing the bottom of the machine shell, of the metal bottom plate, an installation cavity is formed between the metal bottom plate and the bottom of the machine shell, and a heat insulation cover covering the PTC heating element is arranged in the installation cavity. The heat insulation cover covers the outer side of the PTC heating element, so that the heating effect of the PTC heating element and air inlet heat dissipation at the bottom of the machine shell can be considered.

Description

Technical Field

[0001] The utility model relates to the field of air fryers, in particular to an air fryer with good heating effect. Background Art

[0002] In order to improve the uniformity of heating the upper and lower surfaces of food materials in existing air fryers, some air fryers are also provided with a heating device at the bottom of the assembly cavity. In this way, when the air fryer works, the upper and lower double heat sources heat the food materials at the same time, which can make the food materials color more evenly and have a better taste. One type of existing bottom heating structure adopts a heating plate structure, and the heating element is included in the die-cast heating plate, with good overall appearance and easy cleaning at the bottom of the assembly cavity, but the cost of die-castings is relatively high; another type adopts a stainless steel heating tube, and the heating tube is directly exposed at the bottom surface of the cavity (such as the solution of patent CN221153837U). When the user pulls out the fryer, the heating tube can be seen, which is not beautiful, easy to scald the user, and the dirt at the bottom of the cavity is not easy to clean.

[0003] In common household appliances, PTC is also a common heating structure. In related products, PTC is usually directly exposed and arranged in the electrical cavity. For scenarios where heat dissipation is not required in the electrical cavity, PTC can achieve a good heating effect.

[0004] However, when PTC is applied to an air fryer, based on the design of the air fryer, heat dissipation holes are generally provided at the bottom of the casing. External air can flow into the space between the casing and the pot body through the heat dissipation holes to reduce the temperature rise of the casing. If a PTC heating structure is arranged at the bottom of the assembly cavity and PTC is exposed, due to the low heating efficiency of PTC, a part of the heat of PTC will be lost due to the bottom air flow entering from the heat dissipation holes, which is not conducive to the heating effect of PTC on food materials. Moreover, if the air flow carries a part of the heat and flows upward to the machine head, it will also cause the temperature rise of components such as motors in the machine head to increase, which is not conducive to the heat dissipation of electronic components. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an air fryer with good heating effect to solve the problems of excessive heat dissipation and low heating efficiency when the PTC heating structure is exposed at the bottom of the assembly cavity of the existing air fryer under the condition that heat dissipation holes are provided at the bottom of the casing of the air fryer.

[0006] An air fryer with good heating effect disclosed by the utility model comprises a housing with an assembly cavity and a fryer assembly. An opening communicating with the assembly cavity is arranged on one side of the housing. The fryer assembly enters and exits the assembly cavity through the opening. Heat dissipation holes are arranged at the bottom of the housing. A heating component is arranged at the bottom of the assembly cavity. The heating component comprises a metal bottom plate arranged at the bottom of the assembly cavity and a PTC heating element arranged on the bottom side of the metal bottom plate facing the housing. An installation cavity is formed between the metal bottom plate and the bottom of the housing. A heat insulation cover covering the outside of the PTC heating element is arranged in the installation cavity.

[0007] The air fryer with good heating effect of the utility model further has the following additional technical features:

[0008] A first air isolation layer is formed between the inner wall of the heat insulation cover and the PTC heating element with a clearance fit therebetween.

[0009] A second air isolation layer is arranged between the heat insulation cover and the bottom of the housing.

[0010] The heat insulation cover is hoisted on the lower surface of the metal bottom plate, so that a second air isolation layer is formed between the heat insulation cover and the bottom of the housing; or, a convex rib protruding upward is arranged on the bottom wall of the housing, and the heat insulation cover is supported and fixed on the convex rib, so that a second air isolation layer is formed between the heat insulation cover and the bottom wall of the housing.

[0011] At least three column holes are convexly arranged on the side wall of the heat insulation cover, and at least three stud bolts are arranged at the bottom of the housing. The column holes are sleeved outside the stud bolts, and at least one of the column holes and the stud bolt is fixed by a fastener.

[0012] The PTC heating element comprises a heating body and a wire harness connected to the heating body. A wire passing hole for the wire harness to pass through is arranged on the side wall of the heat insulation cover.

[0013] The heating temperature of the PTC heating element does not exceed 150 °C.

[0014] The PTC heating element is fixed to the metal bottom plate by screwing or riveting; or, the heat insulation cover is fixed to the bottom of the housing. The heat insulation cover has a cover side wall extending upward. The PTC heating element comprises a heating body and an installation part radially extending outward from the edge of the heating body. The installation part is placed on the cover side wall, and the cover side wall and the metal bottom plate jointly clamp the installation part.

[0015] A convex reinforcing rib is arranged on the upper surface of the metal bottom plate facing the assembly cavity. The metal bottom plate is provided with an installation hole for fixing the PTC heating element, and the installation hole is arranged on the reinforcing rib.

[0016] The part of the metal bottom plate located inside the opening includes a planar area in the middle and a stepped area surrounding the outside of the planar area. The planar area is recessed relative to the stepped area, and the PTC heating element is arranged on the planar area.

[0017] Due to the above technical solution, the utility model has the following beneficial effects:

[0018] 1. The air fryer with good heating effect of the utility model can prevent the loss of heat of the PTC heating element when the air enters the bottom of the casing by covering the PTC heating element with a heat insulation cover, ensuring the heating effect of the PTC heating element on the food materials. At the same time, the heat insulation cover can prevent the heat radiation of the PTC heating element from being transmitted to the casing, resulting in serious temperature rise and melting at the bottom of the casing, which is beneficial to extending the service life of the casing.

[0019] The PTC heating element is hidden in the installation cavity, which can avoid being exposed and affecting the aesthetics, and the upper surface of the metal bottom plate is easy to clean when the fryer assembly is pulled out, facilitating the operation of the user; when the air fryer is working, the food materials are heated simultaneously by the heating tube above the fryer assembly and the PTC heating element below, which is beneficial to improving the uniformity of food material heating and making the food materials more evenly colored and better in taste.

[0020] 2. As a preferred embodiment, the inner wall of the heat insulation cover is in clearance fit with the PTC heating element, so that a first air isolation layer is formed between the heat insulation cover and the PTC heating element. By setting the first air isolation layer, the isolation of the heat of the PTC heating element from the bottom of the casing is strengthened, reducing the heat transfer to the bottom of the casing and being beneficial to reducing the temperature of the bottom of the casing.

[0021] As a preferred embodiment of this embodiment, a second air isolation layer is provided between the heat insulation cover and the bottom of the casing. Thus, the heat insulation cover does not contact the bottom of the casing, preventing the heat of the PTC heating element from being indirectly transmitted to the bottom of the casing through the heat insulation cover and being beneficial to reducing the temperature of the bottom of the casing.

[0022] Furthermore, the heat insulation cover is hoisted on the lower surface of the metal bottom plate, so that a second air isolation layer is formed between the heat insulation cover and the bottom of the casing. When the heat insulation cover is hoisted, the heat insulation cover does not contact the bottom of the casing at all, and the heat insulation effect is better.

[0023] Or, a rib protruding upward is provided on the bottom wall of the casing, and the heat insulation cover is supported and fixed on the rib, so that a second air isolation layer is formed between the heat insulation cover and the bottom wall of the casing. By raising the heat insulation cover through the rib, the heat insulation cover can be higher than the bottom wall of the casing, and since the contact area between the rib and the heat insulation cover is small, the heat on the heat insulation cover will not be transmitted to the bottom wall of the casing through the rib, ensuring the heat insulation effect.

[0024] 3. As a preferred embodiment, at least three stud holes are convexly provided on the side wall of the heat insulation cover, at least three studs are provided at the bottom of the casing, the stud holes are sleeved outside the studs, and at least one of the stud holes and the studs are fixed by fasteners. It can be understood that the radial limit of the heat insulation cover can be realized by the plug-in fit of at least three stud holes and at least three studs. On this basis, the axial limit of the heat insulation cover can be realized by using at least one fastener. On the premise of ensuring the fixing effect, the use of accessories can be reduced and the structural configuration can be simplified.

[0025] 4. As a preferred embodiment, the PTC heating element includes a heating body and a wire harness connected to the heating body, and a wire passing hole for the wire harness to pass through is provided on the side wall of the heat insulation cover. By providing the wire passing hole, the wire harness can be connected to the control device outside the heat insulation cover through the wire passing hole to ensure the energized use of the PTC heating element.

[0026] 5. As a preferred embodiment, the heating temperature of the PTC heating element does not exceed 150 °C. By adopting this upper limit temperature, the heating effect of the PTC heating element on the food materials can be taken into account, and at the same time, the influence of high temperature on the bottom of the casing can be avoided to extend the service life of the casing.

[0027] 6. As a preferred embodiment, the PTC heating element is fixed to the metal bottom plate by screwing or riveting. By adopting the conventional screwing or riveting method, the structure is simple and the fixing is firm.

[0028] Alternatively, the heat insulation cover is fixed to the bottom of the casing. The heat insulation cover has a cover side wall extending upward. The PTC heating element includes a heating body and an installation part radially extending outward from the edge of the heating body. The installation part is placed on the cover side wall, and the cover side wall and the metal bottom plate jointly clamp the installation part. The PTC heating element can simplify the installation process and omit the separate fixing of the PTC heating element on the premise of ensuring the fixing effect through clamping.

[0029] 7. As a preferred embodiment, a raised reinforcing rib is provided on the upper surface of the metal bottom plate facing the assembly cavity. The metal bottom plate is provided with an installation hole for fixing the PTC heating element, and the installation hole is arranged on the reinforcing rib. By arranging the installation hole on the reinforcing rib, on the one hand, the strength of the fixing point can be ensured, and on the other hand, the aesthetics can be improved.

[0030] 8. As a preferred embodiment, the part of the metal base plate located inside the opening includes a flat area in the middle and a stepped area surrounding the outside of the flat area. The flat area is recessed relative to the stepped area, and the PTC heating element is arranged on the flat area. Arranging the PTC heating element on the flat area can correspond to the middle area of the air fryer assembly, which is beneficial to fully heating the food materials and improving the heat utilization rate. Moreover, the metal base plate adopts a shape with a higher outer part and a lower inner part, which can avoid the local deformation of the metal base plate easily caused by high temperature when adopting an overall flat structure, reduce the probability of the metal base plate being deformed by heat, and improve its use reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0032] Figure 1 is a schematic external view of the housing and the assembly cavity under an embodiment of the present application.

[0033] Figure 2 is an exploded schematic view of the composition structure of the air fryer under an embodiment of the present application.

[0034] Figure 3 is a schematic view of the heat insulation cover fixed on the base under an embodiment of the present application.

[0035] Figure 4 is a schematic cross-sectional view inside the housing under an embodiment of the present application.

[0036] Figure 5 is a schematic view of the structure of the PTC heating element under an embodiment of the present application.

[0037] Figure 6 is a schematic view of the PTC heating element fixed on the metal base plate under an embodiment of the present application.

[0038] Reference numerals:

[0039] 10. Assembly cavity; 11. Housing; 12. Air fryer assembly; 13. Reflector; 14. Thermal fan; 15. Heating tube; 16. Metal base plate; 17. PTC heating element; 18. Installation cavity; 19. Heat insulation cover; 20. Column hole; 171. Heating body; 172. Wiring harness; 191. Wire passing hole; 161. Installation hole; 173. Through hole; 174. Fastener; 162. Reinforcing rib; 163. Flat area; 164. Stepped area; 111. Housing main body; 112. Base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] To more clearly illustrate the overall concept of the present utility model, the following will be further described in detail by way of examples in combination with the accompanying drawings of the specification.

[0041] In order to better understand the above-mentioned objects, features, and advantages of the present application, the following will further describe the present application in detail in combination with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0042] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0043] In addition, in the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0045] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. However, indicating a direct connection means that there is no connection relationship constructed through a transition structure between the two connected main bodies, and they are only connected through the connection structure to form a whole. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean 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 terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0047] As Figures 1 to 6 shown, the present application provides an air fryer with good heating effect, which includes a housing 11 having an assembly cavity 10 and a fryer assembly 12. An opening communicating with the assembly cavity 10 is provided on one side of the housing 11, and the fryer assembly 12 enters and exits the assembly cavity 10 through the opening. A reflector 13 is provided above the assembly cavity 10, and an electrical cavity is formed above the reflector 13. A motor and a cooling fan are provided in the electrical cavity. A hot air assembly formed by a hot air fan 14 and a heating tube 15 is provided at the top of the assembly cavity 10. Heat dissipation holes are provided at the bottom of the housing 11, and a heating assembly is provided at the bottom of the assembly cavity 10. The heating assembly includes a metal bottom plate 16 provided at the bottom of the assembly cavity 10 and a PTC heating element 17 provided on the bottom side of the metal bottom plate 16 facing the housing 11. An installation cavity 18 is formed between the metal bottom plate 16 and the bottom of the housing 11, and a heat insulation cover 19 covering the outside of the PTC heating element 17 is provided in the installation cavity 18.

[0048] For the air fryer with good heating effect of the present application, by covering the outside of the PTC heating element 17 with a heat insulation cover 19, it is possible to prevent heat loss of the PTC heating element 17 when air enters from the bottom of the housing 11, ensure the heating effect of the PTC heating element 17 on the food materials. At the same time, the heat insulation cover 19 can prevent the heat radiation of the PTC heating element 17 from being transmitted to the housing 11, resulting in serious temperature rise and melting at the bottom of the housing 11, which is beneficial to extending the service life of the housing 11.

[0049] The PTC heating element 17 is hidden in the installation cavity 18, which can avoid being exposed and affecting the aesthetics, and the upper surface of the metal bottom plate 16 is easy to clean when the fryer assembly 12 is removed, which is convenient for users to operate; when the air fryer is working, the food materials are heated simultaneously by the heating tube 15 above the fryer assembly 12 and the PTC heating element 17 below, which is beneficial to improving the uniformity of food material heating and can make the food materials color more evenly and taste better.

[0050] On the premise that heat dissipation holes are provided at the bottom of the casing 11, external air can flow into the installation cavity 18 through the heat dissipation holes to dissipate heat from the bottom of the casing 11, which can prevent the bottom of the casing 11 from melting due to excessive temperature rise. And due to the protection of the heat insulation cover 19, the airflow will not carry away the heat of the PTC heating element 17, which can avoid heat loss and thus ensure the heating effect. Further, a sandwich layer is provided, for example, between the side wall of the casing 11 and the assembly cavity 10. External air can flow into the sandwich layer through the heat dissipation holes to cool the side wall of the casing 11, so that the whole casing 11 is maintained within a suitable temperature range, which is beneficial to extending the service life of the casing 11. It can be understood that the heat dissipation holes are not only used for air intake. In some embodiments, the heat dissipation holes can also be used for exhaust heat dissipation. In this case, if the PTC is exposed, heat dissipation will also occur. Therefore, the heat insulation cover 19 of the present application can prevent the influence of the airflow on the PTC heat to ensure its heating efficiency. In some embodiments, the casing 11 includes a casing main body 111 and a base 112 provided at the bottom of the casing main body 111. As Figures 2 to 4 shown, the metal bottom plate 16 and the base 112 can enclose to form an installation cavity 18, and the PTC heating element 17 and the heat insulation cover 19 are both arranged in the installation cavity 18.

[0051] Among them, by using the characteristic that the resistance of the PTC thermosensitive material increases with the increase of temperature, the PTC heating element 17 can realize its own temperature control and stable output power, and has multiple functions such as heating, temperature control, overload protection and temperature compensation. By using the characteristic that the power of the PTC will decay during dry burning, and selecting an appropriate model (dry burning power, upper limit of surface temperature), automatic protection can be realized, and there is no need to additionally equip a temperature controller / fuse to control / protect the bottom heating module. Preferably, selecting a PTC with a dry burning power of 25 watts and an upper limit of surface temperature of 150 °C can take into account the heating effect and will not melt the base 112 of the casing 11. For the specific composition structure and working principle of the PTC, reference can be made to the prior art and will not be elaborated here.

[0052] As a preferred embodiment, the inner wall of the heat insulation cover 19 is in clearance fit with the PTC heating element 17, so that a first air isolation layer is formed between the heat insulation cover 19 and the PTC heating element 17.

[0053] As Figure 4 shown, the PTC heating element 17 is not in contact with the inner side wall and the inner bottom wall of the heat insulation cover 19. By providing the first air isolation layer surrounding the PTC heating element 17, the isolation between the heat of the PTC heating element 17 and the bottom of the casing 11 can be strengthened, the heat transfer between the PTC heating element 17 and the heat insulation cover 19 is reduced, and further the heat transfer between the heat insulation cover 19 and the bottom of the casing 11 can be reduced, which can reduce the heat transfer to the bottom of the casing 11 and is beneficial to reducing the temperature of the bottom of the casing 11.

[0054] As a preferred embodiment of this implementation manner, a second air isolation layer is provided between the heat shield 19 and the bottom of the housing 11. In this embodiment, the heat shield 19 does not contact the bottom of the housing 11, which can prevent the heat of the PTC heating element 17 from indirectly transferring to the bottom of the housing 11 through the heat shield 19, and is beneficial to reducing the temperature of the bottom of the housing 11.

[0055] On the premise of forming the above-mentioned second air isolation layer, the installation of the heat shield 19 can be achieved by any of the following methods.

[0056] In one embodiment, the heat shield 19 is hoisted on the lower surface of the metal bottom plate 16, so that a second air isolation layer is formed between the heat shield 19 and the bottom of the housing 11. When the heat shield 19 is hoisted, the heat shield 19 does not contact the bottom of the housing 11 at all, and the heat insulation effect is better. Specifically, for example, the heat shield 19 is provided with a flanging portion that can be attached to the lower surface of the metal bottom plate 16, and the flanging portion and the metal bottom plate 16 can be fixed by screwing.

[0057] In another embodiment, the bottom wall of the housing 11 is provided with upwardly protruding ribs, and the heat shield 19 is supported and fixed on the ribs, so that a second air isolation layer is formed between the heat shield 19 and the bottom wall of the housing 11. Lifting the heat shield 19 by the ribs can make the heat shield 19 higher than the bottom wall of the housing 11, and since the contact area between the ribs and the heat shield 19 is small, the heat on the heat shield 19 will not be transferred to the bottom wall of the housing 11 through the ribs, ensuring the heat insulation effect. Specifically, the height of the heat shield 19 provided on the ribs satisfies that the top end of the heat shield 19 abuts against the lower surface of the metal bottom plate 16, so as to prevent heat loss of the PTC heating element 17 due to a gap between the heat shield 19 and the metal bottom plate 16.

[0058] As a preferred implementation manner, at least three stud holes 20 are convexly provided on the side wall of the heat shield 19, and at least three studs are provided on the bottom of the housing 11. The stud holes 20 are sleeved outside the studs, and at least one stud hole 20 and the stud are fixed by a fastener.

[0059] It can be understood that the radial limit of the heat shield 19 can be achieved by the insertion and cooperation of at least three stud holes 20 and at least three studs. On this basis, the axial limit of the heat shield 19 can be achieved by using at least one fastener. On the premise of ensuring the fixing effect, the use of accessories can be reduced and the structural configuration can be simplified.

[0060] Such as Figure 3As shown, in one embodiment, the heat shield 19 is, for example, square, and four stud holes 20 are provided near the four azimuth angles of the heat shield 19. During fixation, at least one fastener can be passed through the stud and the stud holes 20 for axial positioning. Of course, at least three stud holes 20 can also be provided. The heat shield 19 can be radially positioned and its circumferential rotation can be restricted by the insertion fit of the three stud holes 20 and the three studs, ensuring the reliability of the positioning on the premise of simplifying the structure.

[0061] As a preferred embodiment, the PTC heating element 17 includes a heating body 171 and a wire harness 172 connected to the heating body 171. A wire passing hole 191 for the wire harness 172 to pass through is provided on the side wall of the heat shield 19.

[0062] By providing the wire passing hole 191, the wire harness 172 can be connected to the control device outside the heat shield 19 through the wire passing hole 191 to ensure the energized use of the PTC heating element 17. As Figure 2 and Figure 5 shown, a concave notch is provided at the upper end of one of the side walls of the heat shield 19 to form the wire passing hole 191. However, the shape of the wire passing hole 191 is not limited to this, and it can also be a small hole structure corresponding to the wire harness 172, which is not limited in this application. The shape of the heat shield 19 is not limited to being square and can be adjusted according to the shape of the heating body 171.

[0063] As a preferred embodiment, the heating temperature of the PTC heating element 17 does not exceed 150°C. By adopting this upper limit temperature, the heating effect of the PTC heating element 17 on the food ingredients can be taken into account, and at the same time, the influence of high temperature on the bottom of the housing 11 can be avoided to extend the service life of the housing 11.

[0064] As a preferred embodiment, the PTC heating element 17 is fixed to the metal base plate 16 by screwing or riveting. Using the conventional screwing or riveting method, the structure is simple and the fixation is firm. For example, as Figure 6 shown, the metal base plate 16 is provided with mounting holes 161, and the PTC heating element 17 is provided with through holes 173 corresponding to the mounting holes 161. The PTC heating element 17 can be fixed by passing through fasteners 174 (such as screws).

[0065] As another preferred embodiment, the heat shield 19 is fixed to the bottom of the housing 11. The heat shield 19 has a cover side wall extending upward. The PTC heating element 17 includes a heating body 171 and a mounting portion radially extending outward from the edge of the heating body 171. The mounting portion is placed on the cover side wall, and the cover side wall and the metal base plate 16 jointly clamp the mounting portion. By clamping the PTC heating element 17, the installation process can be simplified and the separate fixation of the PTC heating element 17 can be omitted on the premise of ensuring the fixation effect.

[0066] As a preferred embodiment, the upper surface of the metal base plate 16 facing the assembly cavity 10 is provided with raised reinforcing ribs 162. The metal base plate 16 is provided with mounting holes 161 for fixing the PTC heating element 17, and the mounting holes 161 are arranged on the reinforcing ribs 162. As Figure 1 shown, by arranging the mounting holes 161 on the reinforcing ribs 162, on the one hand, the strength of the fixing site can be ensured, and on the other hand, the aesthetics can be improved. As Figure 5 and Figure 6 shown, the PTC heating element 17 includes a heating body 171 and a mounting portion extending radially outward from the edge of the heating body 171. The mounting portion is provided with a through hole 173, and the PTC heating element 17 can be fixed by passing a fastener 174 through the through hole 173 and the mounting hole 161. Preferably, the reinforcing ribs 162 can be designed into a certain pattern to improve the aesthetics.

[0067] As a preferred embodiment, the part of the metal base plate 16 located inside the opening includes a planar area 163 in the middle and a stepped area 164 surrounding the outside of the planar area 163. The planar area 163 is recessed relative to the stepped area 164, and the PTC heating element 17 is arranged on the planar area 163.

[0068] As Figure 1 and Figure 6 shown, the planar area 163 has a larger area than the stepped area 164. Arranging the PTC heating element 17 on the planar area 163 can correspond to the middle area of the fryer assembly 12. Based on user habits, the food is usually placed at a position covering the middle area of the pot body. Then, the PTC heating element 17 arranged in the middle will be beneficial to fully heat the food to improve the heat utilization rate. Moreover, the metal base plate 16 adopts a shape with an outer high and inner low structure, which can avoid the local deformation of the metal base plate 16 easily affected by high temperature when adopting an overall planar structure, reduce the probability of the metal base plate 16 being deformed by heat, and improve its use reliability.

[0069] The technical solution protected by the present utility model is not limited to the above embodiments. It should be noted that the combination of the technical solution of any one embodiment with the technical solutions of one or more other embodiments is within the protection scope of the present utility model. Although the present utility model has been described in detail with general descriptions and specific embodiments above, based on the present utility model, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present utility model all belong to the scope required to be protected by the present utility model.

Claims

1. An air fryer with good heating effect, comprising a housing having an assembly cavity and a fryer assembly. An opening communicating with the assembly cavity is provided on one side of the housing. The fryer assembly enters and exits the assembly cavity through the opening. Heat dissipation holes are provided at the bottom of the housing, and a heating component is provided at the bottom of the assembly cavity. It is characterized in that, the heating component includes a metal bottom plate provided at the bottom of the assembly cavity and a PTC heating element provided on the bottom side of the metal bottom plate facing the housing. An installation cavity is formed between the metal bottom plate and the bottom of the housing, and a heat insulation cover covering the outside of the PTC heating element is provided in the installation cavity.

2. The air fryer with good heating effect according to claim 1, characterized in that, the inner wall of the heat insulation cover is in clearance fit with the PTC heating element, so that a first air isolation layer is formed between the heat insulation cover and the PTC heating element.

3. The air fryer with good heating effect according to claim 2, characterized in that, a second air isolation layer is provided between the heat insulation cover and the bottom of the housing.

4. The air fryer with good heating effect according to claim 3, characterized in that, the heat insulation cover is hoisted on the lower surface of the metal bottom plate, so that a second air isolation layer is formed between the heat insulation cover and the bottom of the housing; alternatively, a convex rib protruding upward is provided on the bottom wall of the housing, and the heat insulation cover is supported and fixed on the convex rib, so that a second air isolation layer is formed between the heat insulation cover and the bottom wall of the housing.

5. The air fryer with good heating effect according to claim 1, characterized in that, at least three column holes are convexly provided on the side wall of the heat insulation cover, and at least three stud bolts are provided at the bottom of the housing. The column holes are sleeved on the outside of the stud bolts, and at least one of the column holes and the stud bolts is fixed by a fastener.

6. The air fryer with good heating effect according to claim 1, characterized in that, the PTC heating element includes a heating body and a wire harness connected to the heating body, and a wire passing hole for the wire harness to pass through is provided on the side wall of the heat insulation cover.

7. The air fryer with good heating effect according to claim 1, characterized in that, the heating temperature of the PTC heating element does not exceed 150 °C.

8. The air fryer with good heating effect according to claim 1, characterized in that, the PTC heating element is fixed to the metal bottom plate by screwing or riveting; alternatively, the heat insulation cover is fixed to the bottom of the housing. The heat insulation cover has a cover side wall extending upward. The PTC heating element includes a heating body and an installation portion radially extending outward from the edge of the heating body. The installation portion is placed on the cover side wall, and the cover side wall and the metal bottom plate jointly clamp the installation portion.

9. The air fryer with good heating effect according to claim 1, characterized in that, a raised reinforcing rib is provided on the upper surface of the metal bottom plate facing the assembly cavity. The metal bottom plate is provided with an installation hole for fixing the PTC heating element, and the installation hole is provided on the reinforcing rib.

10. The air fryer with good heating effect according to claim 1, characterized in that, The portion of the metal base plate located inside the opening includes a planar region at the middle and a stepped region surrounding the outside of the planar region. The planar region is recessed relative to the stepped region, and the PTC heating element is disposed on the planar region.

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