Air fryer with firm structure

Abstract

The air fryer comprises a machine body and a reflection cover arranged in the machine body, the reflection cover divides the space in the machine body into a cooking cavity and an installation cavity, a heating piece and a hot air fan are arranged in the cooking cavity, a motor and a cooling fan driven by the motor are arranged in the installation cavity, a motor support is installed on the reflection cover, and the motor support is connected with the machine body. The motor is hung between the motor support and the reflecting cover, the motor comprises an outer rotor shell, the cooling fan comprises a mounting part and a plurality of fan blades, the mounting part comprises a vertical and annular sleeve and an annular bottom plate which is arranged at the bottom of the sleeve and extends towards the center, the fan blades are arranged on the sleeve, and the sleeve is arranged on the periphery of the outer rotor shell in an interference sleeving mode. And the bottom plate abuts against the lower end of the outer rotor shell. According to the invention, the sleeve and the bottom plate cooperate with the outer rotor shell at the same time to enhance the installation firmness of the cooling fan, avoid the noise caused by the shaking and loosening of the cooling fan, and improve the heat dissipation of the bottom of the motor.

Description

Technical Field

[0001] The utility model relates to the field of kitchen appliances, in particular to an air fryer with a firm structure. Background Art

[0002] An air fryer is a device that relies on a hot air component in a cooking chamber to generate a hot air flow to cook food. The hot air fan of the hot air component is driven by a motor outside the cooking chamber. At the same time, a cooling fan is also provided at the top of the motor to enhance the heat dissipation of the motor, thereby improving the performance and life of the motor.

[0003] In the existing air fryers using outer rotor motors, the cooling fan is generally fixed to the outer rotor casing of the motor through a middle sleeve. The cooling fan and the outer rotor casing are only radially positioned. During the operation of the motor, the cooling fan is prone to shaking, resulting in low transmission efficiency. In addition, relative movement is prone to occur between the cooling fan and the outer rotor casing, producing abnormal noise, which increases the working noise of the machine and is not conducive to improving the user experience.

[0004] In particular, when the outer rotor motor is installed by hoisting, the top of the motor is hung on the motor bracket, and there is only a small air gap between the lower end of the motor and the reflector. Since the distance between the motor and the reflector is relatively close, when the air fryer is working, the temperature of the reflector plus the temperature of the motor itself will cause the temperature rise around the motor to increase. In addition, the cooling fan and the outer rotor housing are made of different materials (such as the solution disclosed in patent CN216530776U). The different expansion coefficients of different materials in a high temperature environment can easily cause the cooling fan to fail to fix, further reducing the stability and reliability of the cooling fan installation and increasing the working noise of the machine. Utility Model Content

[0005] In order to solve the technical problems in the prior art that when the outer rotor motor of an air fryer is hoisted, the cooling fan and the outer rotor casing are not securely installed, the transmission efficiency is low, and the noise is high due to the different thermal expansion coefficients under high temperature environment, the utility model provides an air fryer with a secure structure, in which the sleeve and the bottom plate cooperate with the outer rotor casing at the same time to enhance the reliability of the cooling fan installation, avoid the noise caused by shaking and loosening of the cooling fan, and improve the heat dissipation at the bottom of the motor.

[0006] The utility model discloses an air fryer with a reliable structure, comprising a machine body and a reflective cover arranged in the machine body, wherein the reflective cover divides the space in the machine body into a cooking cavity and an installation cavity, a heating element and a hot fan are arranged in the cooking cavity, a motor and a heat dissipation fan driven by the motor are arranged in the installation cavity, a motor bracket is installed on the reflective cover, the motor is suspended between the motor bracket and the reflective cover, the motor comprises an outer rotor shell, the heat dissipation fan comprises a mounting portion and a plurality of fan blades, the mounting portion comprises a vertical and annular sleeve and an annular bottom plate arranged at the bottom of the sleeve and extending toward the center, the plurality of fan blades are arranged on the sleeve, the sleeve is interference-fittedly sleeved on the outer periphery of the outer rotor shell, and the bottom plate abuts against the lower end of the outer rotor shell.

[0007] The air fryer of the utility model has a reliable structure and also has the following additional technical features:

[0008] The fan blade comprises a base plate formed by bending the top edge of the sleeve outwards and a blade arranged on the base plate.

[0009] The driving circuit board of the motor is arranged on the motor bracket, and the blades extend upward relative to the base plate.

[0010] The driving circuit board and the top end of the motor are spaced apart to form a heat dissipation gap.

[0011] The blades extend downward relative to the base plate, and the lower ends of the blades are arranged higher than the bottom plate.

[0012] The height of the sleeve is not less than 5 mm, and the height of the sleeve is not greater than the height of the outer rotor housing.

[0013] The radius of the outer rotor housing is R, and the radial width of the bottom plate is no greater than 0.5R.

[0014] The outer cover of the reflector cover is provided with a heat insulation cover to isolate the reflector cover and the motor.

[0015] The width of the base plate decreases in a direction away from the sleeve.

[0016] The motor includes a rotating shaft, which passes through the center of the outer rotor shell. The lower end of the rotating shaft is connected to the thermal fan. A retaining ring and a fastening nut arranged below the retaining ring are sleeved on the rotating shaft, and the thermal fan is fastened between the retaining ring and the fastening nut.

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

[0018] 1. The utility model has a reliable structure of the air fryer. In order to solve the technical problems of the unreliable installation, low transmission efficiency and high noise caused by the different thermal expansion coefficients of the cooling fan and the outer rotor shell in a high temperature environment when the outer rotor motor of the existing air fryer is hoisted, the outer rotor shell is tightened by the sleeve and the cooperation between the bottom plate and the outer rotor shell is increased, so that the cooling fan and the outer rotor shell can achieve radial and axial limit, and the firmness and stability of the cooling fan installation are enhanced. On the one hand, the bottom plate can increase the friction between the bottom plate and the outer rotor shell to prevent the cooling fan from loosening, and prevent the cooling fan and the outer rotor shell from relative movement to affect the transmission and increase the noise. On the other hand, the bottom plate can transfer the heat from the bottom of the motor to the fan blades, and can also block the heat transfer of the reflector cover, thereby improving the heat dissipation effect of the motor and facilitating the use performance and life of the motor.

[0019] 2. To improve the working stability of the cooling fan, as a preferred embodiment, the fan blades include a base formed by bending the top edge of the sleeve outward and blades arranged on the base. By arranging the fan blades at the upper end of the sleeve, the center of gravity of the cooling fan can be increased, and the stability of the cooling fan rotation can be increased under the premise of hoisting the motor.

[0020] In order to enhance the heat dissipation of related components, as a preferred embodiment of the present embodiment, the driving circuit board of the motor is arranged on the motor bracket, and the blades extend upward relative to the substrate. Since the blades extend upward, the distance between them and the driving circuit board is relatively close, which is beneficial for the blades to take away the heat of the driving circuit board while dissipating the heat of the motor, thereby enhancing the heat dissipation of the driving circuit board, improving the heat dissipation efficiency of the driving circuit board, and preventing the high temperature of the driving circuit board from affecting the life of the components thereon.

[0021] Furthermore, in order to prevent the heat of the motor from being transferred to the driver circuit board and to further improve the heat dissipation effect of the driver circuit board, in one embodiment, the driver circuit board and the top of the motor are spaced apart to form a heat dissipation gap. By setting the heat dissipation gap, on the one hand, the motor can be prevented from being too close to the driver circuit board, thereby preventing the heat of the motor from being transferred to the driver circuit board, and on the other hand, the driver circuit board can be placed in an open environment, which is conducive to cold air flowing through the driver circuit board to accelerate its heat dissipation, thereby improving the heat dissipation efficiency.

[0022] 3. In order to speed up the heat transfer from the bottom of the motor to the blades through the bottom plate and be carried away by the airflow, as a preferred embodiment, the blades extend downward relative to the base plate, and the lower ends of the blades are arranged higher than the bottom plate. In this solution, the blades are closer to the bottom plate, which can improve the heat conduction efficiency of the bottom of the motor and the heat dissipation efficiency of the bottom of the motor. In addition, the lower ends of the blades are arranged higher than the bottom plate, which helps to make the center of gravity of the cooling fan as a whole higher, so as to ensure the stability of the rotation of the cooling fan and the motor as a whole.

[0023] 4. In order to improve the assembly effect between the sleeve and the outer rotor housing and the heat dissipation effect of the motor, as a preferred embodiment, the height of the sleeve is not less than 5 mm, and the height of the sleeve is not greater than the height of the outer rotor housing. That is, the height of the sleeve should not be too small to prevent the sleeve from having a low fixing strength with the outer rotor housing and the cooling fan from falling off easily. At the same time, the height of the sleeve cannot exceed the height of the outer rotor housing, otherwise the outer periphery of the motor will be blocked too much, which will affect the heat dissipation effect of the motor and increase the manufacturing cost.

[0024] 5. Under the premise of ensuring the limiting effect of the bottom plate on the outer rotor housing, in order to avoid the bottom plate being too large to affect the heat dissipation at the bottom of the motor, as a preferred embodiment, the radius of the outer rotor housing is R, and the radial width of the bottom plate is not greater than 0.5R. That is, the bottom plate half-wraps the bottom of the motor, which can enhance the fixing reliability of the cooling fan while partially exposing the bottom of the motor to facilitate heat dissipation, thereby improving the heat dissipation effect.

[0025] 6. In order to reduce the heat transfer from the reflector to the motor, which may cause the motor to rise too high in temperature, and the heat dissipation fan and the outer rotor housing to expand to different degrees due to high temperature, which may affect the installation effect of the heat dissipation fan, as a preferred embodiment, the outer cover of the reflector is provided with a heat insulation cover to isolate the reflector and the motor. The heat insulation cover can block heat transfer and prevent the motor from rising too high in temperature, and at the same time, it is conducive to allowing the heat of the reflector to fully act on the food to improve the cooking effect in the cooking cavity.

[0026] 7. In order to further improve the working stability of the cooling fan and reduce the working noise, as a preferred embodiment, the width of the substrate decreases in the direction away from the sleeve. On the one hand, the area of ​​the substrate between adjacent blades is reduced, so that the probability of collision between the airflow and the substrate between adjacent blades can be reduced during the process of the airflow being pushed by the blades, thereby helping to reduce the generation of noise. On the other hand, the overall area of ​​the substrate is reduced, which helps to reduce its weight and reduce the burden of the cooling fan on the motor, so that the transmission effect of the motor driving the cooling fan is better and the working stability is improved.

[0027] 8. In conventional structures, the lower end of the motor shaft is provided with a shaft sleeve to install the heat fan. In order to facilitate the lower end of the shaft provided with the shaft sleeve to pass through the shaft hole on the reflector to extend into the cooking cavity, the shaft hole is required to have a larger opening. The increase in the shaft hole will inevitably increase the probability of the airflow overflowing from the cooking cavity during the operation of the machine, causing high-temperature steam and water vapor to damage the electrical components in the installation cavity. In order to solve this problem, as a preferred embodiment, the motor includes a shaft, which is passed through the center of the outer rotor housing, and the lower end of the shaft is connected to the heat fan. A retaining ring and a fastening nut provided below the retaining ring are sleeved on the shaft, and the heat fan is fastened between the retaining ring and the fastening nut. That is, by omitting the shaft sleeve and using the retaining ring and the fastening nut to limit the heat fan from both ends, not only can the heat fan be firmly installed, but also the size of the shaft hole can be reduced to further reduce the probability of the airflow overflowing from the cooking cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 on the present invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a cooling fan and a motor after assembly according to an implementation mode of the present application.

[0030] Figure 2 A schematic diagram of the structure of a heat dissipation fan according to an embodiment of the present application.

[0031] Figure 3 This is a schematic diagram of the driver circuit board configuration and its relationship with the blades in one implementation of the present application.

[0032] Figure 4 This is a schematic diagram of the blade arrangement according to one embodiment of the present application.

[0033] Reference numerals:

[0034] 10. Motor; 11. Cooling fan; 12. Motor bracket; 13. Outer rotor housing; 14. Fan blade; 15. Sleeve; 16. Bottom plate; 141. Base plate; 142. Blade; 17. Drive circuit board; 18. Cooling gap; 101. Rotating shaft. DETAILED DESCRIPTION

[0035] 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.

[0036] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0037] 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 protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0038] 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through a transition structure, but are only connected to form a whole through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0041] In the present utility model, 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 utility model. 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.

[0042] like Figures 1 to 4 As shown, the present application provides an air fryer with a reliable structure, comprising a body and a reflective cover arranged in the body, the reflective cover divides the space in the body into a cooking cavity and an installation cavity, the cooking cavity is provided with a heating element and a hot fan, the installation cavity is provided with a motor 10 and a cooling fan 11 driven by the motor 10, a motor bracket 12 is installed on the reflective cover, the motor 10 is suspended between the motor bracket 12 and the reflective cover, the motor 10 comprises an outer rotor housing 13, the cooling fan 11 comprises a mounting portion and a plurality of fan blades 14, the mounting portion comprises a vertical and annular sleeve 15 and an annular bottom plate 16 arranged at the bottom of the sleeve 15 and extending toward the center, the plurality of fan blades 14 are arranged on the sleeve 15, the sleeve 15 is interference-fitted on the outer periphery of the outer rotor housing 13, and the bottom plate 16 abuts against the lower end of the outer rotor housing 13.

[0043] The utility model has an air fryer with a reliable structure. In order to solve the technical problems of unstable installation, low transmission efficiency and high noise caused by different thermal expansion coefficients of the heat dissipation fan 11 and the outer rotor shell 13 in a high temperature environment when the outer rotor motor of the existing air fryer is hoisted, a bottom plate 16 is added to cooperate with the outer rotor shell 13 while the sleeve 15 is used to tighten the outer rotor shell 13, so that the heat dissipation fan 11 and the outer rotor shell 13 can achieve radial and axial limit, thereby enhancing the firmness and stability of the installation of the heat dissipation fan 11. On the one hand, the bottom plate 16 can increase the friction between the bottom plate 16 and the outer rotor shell 13 to prevent the heat dissipation fan 11 from loosening, and prevent the heat dissipation fan 11 and the outer rotor shell 13 from relative movement to affect the transmission and increase the noise. On the other hand, the bottom plate 16 can transfer the heat from the bottom of the motor 10 to the fan blades 14, and can also block the heat transfer of the reflector cover, thereby improving the heat dissipation effect of the motor 10, which is beneficial to improving the performance and life of the motor 10.

[0044] Specifically, the motor 10 is hoisted between the motor bracket 12 and the reflector cover. The motor bracket 12 is, for example, a shell structure. The motor 10 is hoisted on the top wall of the motor bracket 12. The side wall of the motor bracket 12 can be fixed to the reflector cover. The motor bracket 12 and the reflector cover can enclose a heat dissipation duct to improve the heat dissipation of the motor 10. Alternatively, the motor bracket 12 can also adopt other structures. For example, the motor bracket 12 is a plate structure, which can be installed on the reflector cover through an air duct cover. The air duct cover and the reflector cover enclose a heat dissipation duct. With the outer rotor motor 10, the overall structural height of the motor 10 and the heat dissipation fan 11 is small, which can reduce the occupation of the space in the installation cavity, which is conducive to the miniaturization of the air fryer in the axial direction. Regarding the structure of the motor 10, the motor 10 also includes a rotor, a stator and a motor shaft 101 arranged on the inner side of the outer rotor housing 13. The characteristics of each component and the relationship between the components can refer to the relevant technology. The present application mainly improves the assembly relationship between the heat dissipation fan 11 and the outer rotor housing 13.

[0045] like Figure 2 As shown, the sleeve 15 and the bottom plate 16 are limited with the outer rotor housing 13 in both radial and axial directions. Even when the mounting portion and the outer rotor housing 13 are made of different materials, the sleeve 15 will be restricted to a certain extent by the bottom plate 16 in a high temperature environment, which can reduce the probability of the mounting portion and the outer rotor housing 13 expanding to different degrees and causing the fixing failure of the cooling fan 11, thereby enhancing the installation firmness and stability of the cooling fan 11. The bottom plate 16 is in contact with the bottom of the outer rotor housing 13, which is conducive to guiding the heat at the bottom of the motor 10 to transfer upward to the position of the fan blades 14, so that the fan blades 14 can take away the heat in time, thereby helping to improve the heat dissipation efficiency of the motor 10. Among them, the sleeve 15 and the bottom plate 16 can be integrally formed to improve the overall structural strength.

[0046] In order to improve the working stability of the cooling fan 11, as a preferred embodiment, the fan blade 14 includes a base plate 141 formed by bending the top edge of the sleeve 15 outward and a blade 142 arranged on the base plate 141. By arranging the fan blade 14 at the upper end of the sleeve 15, the center of gravity of the cooling fan 11 can be increased, and the stability of the rotation of the cooling fan 11 can be increased under the premise of hoisting the motor 10.

[0047] The substrate 141 extends horizontally. The substrate 141 can be configured as a continuous ring structure or as Figure 2As shown, a plurality of substrates 141 are arranged at intervals along the circumferential direction. Preferably, the width of the substrate 141 decreases in the direction away from the sleeve 15. On the one hand, the area of ​​the substrate 141 between adjacent blades 142 is reduced, so that the probability of collision between the airflow and the substrate 141 between adjacent blades 142 can be reduced in the process of the airflow being pushed by the blades 142, thereby helping to reduce the generation of noise. On the other hand, the overall area of ​​the substrate 141 is reduced, which helps to reduce its weight and reduce the burden of the cooling fan 11 on the motor 10, so that the transmission effect of the motor 10 driving the cooling fan 11 is better and the working stability is improved. In addition, a gripping gap is formed between adjacent blades 142, which can facilitate technicians to pick up the cooling fan 11 through the gripping gap, providing convenient operation.

[0048] In order to enhance the heat dissipation of related components, as a preferred embodiment of the present embodiment, the driving circuit board 17 of the motor 10 is disposed on the motor bracket 12 , and the blades 142 extend upward relative to the base plate 141 .

[0049] like Figure 3 As shown, since the blade 142 extends upward, the distance between it and the driving circuit board 17 is relatively close, while dissipating heat for the motor 10, the blade 142 is conducive to taking away the heat of the driving circuit board 17, thereby enhancing the heat dissipation of the driving circuit board 17, and improving the heat dissipation efficiency of the driving circuit board 17, and preventing the high temperature of the driving circuit board 17 from affecting the life of the components thereon. The motor bracket 12 is, for example, a plate-type structure, and the driving circuit board 17 is arranged on the lower surface of the motor bracket 12, so that the blade 142 can take away the heat of the driving circuit board 17 in time.

[0050] Furthermore, in order to prevent the heat of the motor 10 from being transferred to the driving circuit board 17 and to further improve the heat dissipation effect of the driving circuit board 17, in one embodiment, the driving circuit board 17 and the top of the motor 10 are spaced apart to form a heat dissipation gap 18. Figure 3 As shown, by setting the heat dissipation gap 18, on the one hand, the motor 10 can be prevented from being too close to the driving circuit board 17, thereby preventing the heat of the motor 10 from being transferred to the driving circuit board 17. On the other hand, the driving circuit board 17 can be placed in an open environment, which is conducive to cold air flowing through the driving circuit board 17 to accelerate its heat dissipation, thereby improving the heat dissipation efficiency.

[0051] It is understood that the extension direction of the blade 142 is not limited to Figure 3 In other embodiments, the blades 142 may also extend downward relative to the base plate 141.

[0052] In order to accelerate the heat transfer from the bottom of the motor 10 to the blade 142 through the bottom plate 16 and be taken away by the airflow, as a preferred embodiment, the blade 142 extends downward relative to the base plate 141, and the lower end of the blade 142 is arranged higher than the bottom plate 16. Figure 4 As shown, in this embodiment, the blade 142 is closer to the base plate 16, which can improve the heat conduction efficiency at the bottom of the motor 10 and improve the heat dissipation efficiency at the bottom of the motor 10. The lower end of the blade 142 is higher than the base plate 16, which helps to move the center of gravity of the cooling fan 11 upward to ensure the stability of the overall rotation of the cooling fan 11 and the motor 10.

[0053] When the top of the motor bracket 12 is used for air intake, the blades 142 can be arranged to extend upward relative to the base plate 141, which is conducive to air intake to improve heat dissipation efficiency.

[0054] In order to improve the assembly effect between the sleeve 15 and the outer rotor housing 13 and the heat dissipation effect of the motor 10, it can be achieved by reasonably setting the height H of the sleeve 15. As a preferred embodiment, the height H of the sleeve 15 is not less than 5 mm, and the height H of the sleeve 15 is not greater than the height of the outer rotor housing 13. That is, the height H of the sleeve 15 should not be too small to prevent the sleeve 15 from having a low fixing strength with the outer rotor housing 13, and the cooling fan 11 from easily falling off. At the same time, the height H of the sleeve 15 cannot exceed the height of the outer rotor housing 13, otherwise the outer periphery of the motor 10 is too blocked to affect the heat dissipation effect of the motor 10, and also increase the manufacturing cost.

[0055] Under the premise of ensuring the limiting effect of the bottom plate 16 on the outer rotor housing 13, in order to avoid the bottom plate 16 being too large to affect the heat dissipation at the bottom of the motor 10, as a preferred embodiment, the radius of the outer rotor housing 13 is R, and the radial width of the bottom plate 16 is not greater than 0.5R. That is, the bottom plate 16 half-wraps the bottom of the motor 10, while strengthening the fixing reliability of the cooling fan 11, the bottom of the motor 10 can be partially exposed to facilitate outward heat dissipation, thereby improving the heat dissipation effect. In addition, the half-wrapped setting of the bottom plate 16 is conducive to placing the top of the motor 10 and the bottom of the motor 10 (partial area) in an open environment, which can achieve a certain amount of air convection and further enhance the heat dissipation of the motor 10.

[0056] exist Figure 2 In the example, the base plate 16 is a single annular structure. It can be understood that in other embodiments, the base plate 16 may include a first annular plate located on the outer circle and a second annular plate located on the inner circle, wherein the first annular plate is a complete structure, and the second annular plate is provided with a plurality of air holes for heat dissipation, and the center of the second annular plate can provide a space for the rotating shaft 101 to pass through.

[0057] In order to reduce the heat transfer from the reflector to the motor 10, which may cause the motor 10 to have an excessively high temperature rise, and the heat dissipation fan 11 and the outer rotor housing 13 to expand to different degrees due to high temperature, thereby affecting the installation effect of the heat dissipation fan 11, as a preferred embodiment, the outer cover of the reflector is provided with a heat insulation cover to isolate the reflector and the motor 10. The heat insulation cover can block the heat transfer and prevent the motor 10 from having an excessively high temperature rise, and at the same time, it is conducive to allowing the heat of the reflector to fully act on the food to improve the cooking effect in the cooking cavity.

[0058] Specifically, when the motor bracket 12 is in direct contact with the reflector, the heat insulation cover can be provided to reduce the effect of the temperature of the reflector on the motor 10. When the motor bracket 12 is not in direct contact with the reflector (for example, the motor bracket 12 is installed on the reflector through the duct cover), the heat insulation cover can be omitted, and the duct cover can be used for heat insulation, which can be provided according to actual needs.

[0059] In the conventional structure, the lower end of the rotating shaft 101 of the motor 10 is provided with a shaft sleeve to install the hot fan. In order to facilitate the lower end of the rotating shaft 101 provided with the shaft sleeve to pass through the shaft hole on the reflector to extend into the cooking cavity, the shaft hole is required to have a larger opening. The increase in the shaft hole will inevitably increase the probability of the airflow overflowing from the cooking cavity during the operation of the machine, resulting in damage to the electrical components in the installation cavity caused by high-temperature steam and water vapor. In order to solve this problem, as a preferred embodiment, the motor 10 includes a rotating shaft 101, the rotating shaft 101 is passed through the center of the outer rotor housing 13, the lower end of the rotating shaft 101 is connected to the hot fan, the rotating shaft 101 is sleeved with a retaining ring and a fastening nut provided below the retaining ring, and the hot fan is fastened between the retaining ring and the fastening nut. That is, by omitting the shaft sleeve and using the retaining ring and the fastening nut to limit the hot fan from both ends, not only can the hot fan be firmly installed, but also the size of the shaft hole can be reduced to further reduce the probability of the airflow overflowing from the cooking cavity.

[0060] The technical solution protected by the present utility model is not limited to the above-mentioned embodiments. It should be pointed out that the combination of the technical solution of any embodiment with the technical solution 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 above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to it based on the present utility model. Therefore, these modifications or improvements made without departing from the spirit of the present utility model are within the scope of protection claimed by the present utility model.

Claims

1. An air fryer with a reliable structure, comprising a body and a reflector arranged in the body, wherein the reflector divides the space in the body into a cooking cavity and an installation cavity, wherein a heating element and a heat fan are arranged in the cooking cavity, and wherein a motor and a heat dissipation fan driven by the motor are arranged in the installation cavity, wherein: A motor bracket is installed on the reflector cover, and the motor is suspended between the motor bracket and the reflector cover. The motor includes an outer rotor shell, and the cooling fan includes a mounting portion and a plurality of fan blades. The mounting portion includes a vertical and annular sleeve and an annular bottom plate arranged at the bottom of the sleeve and extending toward the center. The plurality of fan blades are arranged on the sleeve, and the sleeve is interference-fitted on the outer periphery of the outer rotor shell, and the bottom plate abuts against the lower end of the outer rotor shell.

2. The air fryer with a reliable structure according to claim 1, characterized in that: The fan blade comprises a base plate formed by bending the top edge of the sleeve outwards and a blade arranged on the base plate.

3. The air fryer with a reliable structure according to claim 2, characterized in that: The driving circuit board of the motor is arranged on the motor bracket, and the blades extend upward relative to the base plate.

4. The air fryer with a reliable structure according to claim 3, characterized in that: The driving circuit board and the top end of the motor are spaced apart to form a heat dissipation gap.

5. The air fryer with a reliable structure according to claim 2, characterized in that: The blades extend downward relative to the base plate, and the lower ends of the blades are arranged higher than the bottom plate.

6. The air fryer with a reliable structure according to claim 1, characterized in that: The height of the sleeve is not less than 5 mm, and the height of the sleeve is not greater than the height of the outer rotor housing.

7. The air fryer with a reliable structure according to claim 1, characterized in that: The radius of the outer rotor housing is R, and the radial width of the bottom plate is no greater than 0.5R.

8. The air fryer with a reliable structure according to claim 1, characterized in that: The outer cover of the reflector cover is provided with a heat insulation cover to isolate the reflector cover and the motor.

9. The air fryer with a reliable structure according to claim 2, characterized in that: The width of the base plate decreases in a direction away from the sleeve.

10. The air fryer with a reliable structure according to claim 1, characterized in that: The motor includes a rotating shaft, which passes through the center of the outer rotor shell. The lower end of the rotating shaft is connected to the thermal fan. A retaining ring and a fastening nut arranged below the retaining ring are sleeved on the rotating shaft, and the thermal fan is fastened between the retaining ring and the fastening nut.

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