Air fryer capable of optimizing heat dissipation

Abstract

The air fryer comprises a machine body, a reflecting cover is arranged in the machine body and divides the space in the machine body into an upper mounting cavity and a lower cooking cavity, and a motor support, a motor, a motor driving plate for controlling the motor to work and a cooling fan driven by the motor are arranged in the mounting cavity. The motor comprises a motor body, the motor body is hung below a motor support, a cooling fan is fixed to an outer rotor shell of the motor body, a motor driving plate is fixed to the lower end of the motor support, a first cooling gap is formed between the lower end of the motor driving plate and the top end of the motor body, and the cooling fan comprises a plurality of fan blades. The fan blade comprises a horizontal base plate and blades extending upwards from the base plate. The arrangement of the motor driving board is optimized, so that the motor driving board is arranged in a relatively open environment to enhance heat dissipation, and meanwhile, the heat dissipation of heat on the motor driving board is accelerated by virtue of the effect of the heat dissipation fan, so that the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of kitchen appliances, in particular to an air fryer with optimized heat dissipation. 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. Usually, a heat dissipation fan is provided on the top of the motor to enhance the heat dissipation of the motor, so as to improve the performance and life of the motor. Furthermore, a motor drive board is usually provided to control the operation of the motor. Since the motor drive board is also a heat-generating component, it will generate a lot of heat when in use. If heat dissipation is not performed, its performance and life will inevitably be affected.

[0003] Most of the existing technologies only focus on the heat dissipation of the motor and ignore the heat dissipation of the motor drive board, resulting in extremely poor heat dissipation of the motor drive board. For example, the existing patent CN216290557U discloses a motor structure that can be applied to an air fryer, wherein the motor includes a rotor shell, a base, a stator, a rotating shaft and a control circuit board, wherein the stator is clamped on the base, the rotor shell covers the outside of the stator, and the control circuit board is arranged in the space surrounded by the rotor shell and the base.

[0004] In the above scheme, the control circuit board is arranged in a relatively closed space, which is not conducive to heat dissipation. The fan connected to the outside of the motor cannot play a role in cooling the control circuit board. In addition, the control circuit board is closely attached to the base. When the temperature of the motor rises, the base is affected by the ambient temperature and heated up. The heat on the base is easily transferred to the control circuit board, which can easily lead to an increase in the temperature rise of the control circuit board, and then lead to a decrease in the service life of the components on the control circuit board. Utility Model Content

[0005] In order to solve the technical problem in the prior art that the motor drive board is set in a relatively closed environment and has poor heat dissipation effect, the utility model provides an air fryer with optimized heat dissipation, which enhances heat dissipation by optimizing the arrangement of the motor drive board and placing it in a relatively open environment. At the same time, with the help of the cooling fan, the heat dissipation of the motor drive board is accelerated to improve its heat dissipation efficiency. The heat dissipation effect of the motor drive board can be improved without increasing the cost, thereby enhancing its performance and extending its life.

[0006] The utility model discloses an air fryer with optimized heat dissipation, comprising a machine body, wherein a reflective cover is arranged in the machine body, wherein the reflective cover divides the space in the machine body into an upper installation cavity and a lower cooking cavity, wherein a motor bracket, a motor, a motor drive plate for controlling the operation of the motor and a heat dissipation fan driven by the motor are arranged in the installation cavity, wherein the motor comprises a motor body, wherein the motor body is hoisted below the motor bracket, wherein the heat dissipation fan is fixed on an outer rotor shell of the motor body, wherein the motor drive plate is fixed to the lower end of the motor bracket and a first heat dissipation gap is arranged between the lower end of the motor drive plate and the top end of the motor body, wherein the heat dissipation fan comprises a plurality of fan blades, wherein the fan blades comprise a horizontal base plate and blades extending upward from the base plate.

[0007] The air fryer with optimized heat dissipation of the utility model also has the following additional technical features:

[0008] The motor bracket includes a horizontal bracket body and a support arm connected to the periphery of the bracket body, a second heat dissipation gap is provided between the upper end of the motor drive plate and the lower end of the bracket body, and a penetrating heat dissipation hole connected to the second heat dissipation gap is provided on the bracket body.

[0009] At least part of the heat dissipation holes are arranged above the motor driving board.

[0010] The heat dissipation hole is communicated with the first heat dissipation gap.

[0011] The distance of the first heat dissipation gap is 2-3 mm; and / or the distance of the second heat dissipation gap is 2-3 mm.

[0012] The bracket body is provided with a fixing portion extending downward, and the motor drive board is provided with a matching portion, and the matching portion and the fixing portion cooperate to enable the motor drive board to be hoisted.

[0013] The heat dissipation fan comprises a mounting sleeve and a plurality of fan blades arranged on the mounting sleeve. The mounting sleeve is sleeved and fixed on the outer rotor housing, and the plurality of fan blades are arranged on the top end of the mounting sleeve.

[0014] An annular bottom plate extending inward is provided at the bottom of the mounting sleeve, and the bottom plate abuts against the lower end of the outer rotor housing.

[0015] The lower end of the motor bracket extends downward to form a hollow mounting column, the motor body includes a stator, an outer rotor shell surrounding the outside of the stator, and a rotating shaft passed through and fixed at the center of the outer rotor shell, the rotating shaft passes through the inner cavity of the mounting column, a ball bearing is arranged between the rotating shaft and the inner wall of the mounting column, the ball bearing includes a bearing inner ring, a bearing outer ring and balls arranged between the bearing inner ring and the bearing outer ring, the bearing outer ring is in interference with the inner wall of the mounting column, and along the axial direction of the rotating shaft, a compression spring surrounding the rotating shaft is arranged between the bearing inner ring and the outer rotor shell.

[0016] A boss protruding upward is provided at the bottom center of the outer rotor housing, the boss is provided with a rotating shaft through hole, and the compression spring abuts between the boss and the inner ring of the bearing.

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

[0018] 1. The utility model of the air fryer with optimized heat dissipation, in order to solve the problem of poor heat dissipation of the motor drive board, when the motor is hoisted, the motor drive board is arranged between the motor and the motor bracket, and a first heat dissipation gap is formed, which can not only avoid the heat transfer that is easy to occur when the motor is too close to the motor drive board, but also provide a heat dissipation flow channel, which can increase the contact area between the cold air and the surface of the motor drive board, and improve the heat dissipation effect of the motor drive board.

[0019] Furthermore, the cooling fan can not only dissipate heat from the motor, but also dissipate heat from the motor drive board. Since the blades extend upward and the motor drive board is closer to the blades, the heat on the motor drive board can reach the blades more quickly and be blown away by the blades, thereby accelerating the cooling of the motor drive board and helping to improve its heat dissipation efficiency.

[0020] It should be noted that, based on the setting of the first heat dissipation gap, the lower surface of the motor drive board of the present application is in an open environment, which is conducive to cold air flowing through its surface, and can effectively improve its heat dissipation effect compared to being in a closed environment.

[0021] 2. In order to further improve the heat dissipation effect of the motor drive board, as a preferred embodiment, the motor bracket includes a horizontal bracket body and a support arm connected to the periphery of the bracket body, a second heat dissipation gap is provided between the upper end of the motor drive board and the lower end of the bracket body, and a penetrating heat dissipation hole connected to the second heat dissipation gap is provided on the bracket body. By setting the heat dissipation hole and the second heat dissipation gap, cold air can flow into the second heat dissipation gap through the heat dissipation hole to dissipate the upper surface of the motor drive board, thereby effectively dissipating the upper and lower surfaces of the motor drive board, which can improve the overall heat dissipation effect and heat dissipation efficiency. In addition, the setting of the second heat dissipation gap can prevent the motor drive board from being close to the bracket body and causing heat transfer, thereby achieving heat isolation and preventing the motor drive board from overheating.

[0022] In addition, the cold air flowing into the second heat dissipation gap through the heat dissipation holes can also dissipate heat at the upper end of the motor, thereby enhancing the heat dissipation effect of the motor.

[0023] As a preferred embodiment of the present embodiment, at least part of the heat dissipation holes are arranged above the motor drive board. In this embodiment, at least part of the heat dissipation holes can face the upper surface of the motor drive board, so that cold air can be blown directly to the motor drive board, thereby accelerating the heat dissipation of the motor drive board.

[0024] As a preferred embodiment of the present embodiment, the heat dissipation hole is connected to the first heat dissipation gap. In this embodiment, the heat dissipation hole, the second heat dissipation gap and the first heat dissipation gap are connected in sequence, so that the cold air passing through the heat dissipation hole can not only dissipate the upper surface of the motor drive board, the lower surface of the motor drive board, but also dissipate the upper end of the motor, thereby improving the utilization rate of the cold air and the heat dissipation efficiency.

[0025] As a preferred embodiment of the present embodiment, the distance of the first heat dissipation gap is 2-3mm. By reasonably setting the distance of the first heat dissipation gap, it is possible to avoid heat transfer between components when the distance is too small, and to avoid the difficulty of cold air flowing into the gap to dissipate heat on the lower surface of the motor drive board; at the same time, it is possible to avoid the situation where the distance is too large, on the one hand, the distance from the fan blade to the motor drive board is increased, causing the path of heat from the motor drive board to the fan blade to be extended, thereby affecting the heat dissipation efficiency; on the other hand, when the axial size of the motor assembly remains unchanged, it is necessary to set the motor drive board upward or the motor body downward, and setting the motor drive board upward will cause the motor drive board to be too close to the bracket body, which is not conducive to the heat dissipation on the upper surface of the motor drive board, and setting the motor body downward will make the motor closer to the reflector cover below, and the heat of the reflector cover is easily transferred to the motor, resulting in an increase in the temperature rise of the motor, which is not conducive to the extension of the motor life.

[0026] It is understandable that the second heat dissipation gap can also be set within a certain range, for example, the distance of the second heat dissipation gap is 2-3mm. When the distance of the second heat dissipation gap is too small, the heat on the motor bracket is easily transferred to the motor drive board. When the distance of the second heat dissipation gap is too large, if the distance of the first heat dissipation gap remains unchanged, the axial size of the motor bracket needs to be enlarged. At this time, the motor hoisting is prone to shaking, which is not conducive to the stability of the motor operation.

[0027] As a preferred embodiment of the present embodiment, the bracket body is provided with a fixing portion extending downward, and the motor drive board is provided with a matching portion, and the matching portion and the fixing portion cooperate to enable the motor drive board to be hoisted. Under the premise of ensuring that the motor drive board is securely installed, by hoisting the motor drive board, the motor drive board can be suspended relative to the bracket body, which can avoid heat transfer caused by contact between the two, and is conducive to the motor drive board being fully exposed to cold air, thereby ensuring its heat dissipation effect.

[0028] 3. In order to simplify the assembly of the cooling fan and the motor, and further improve the heat dissipation efficiency of the motor drive board, as a preferred embodiment, the cooling fan includes a mounting sleeve and a plurality of blades arranged on the mounting sleeve, the mounting sleeve is fixedly mounted on the outer rotor housing, and the plurality of blades are arranged on the top of the mounting sleeve. Among them, the cooling fan is mounted on the outer rotor housing and is firmly installed, which can improve the stability and reliability of the cooling fan transmission, and the assembly is simple. The overall structure formed by the motor and the cooling fan is compact, which is conducive to reducing the occupation of the installation cavity space and is conducive to the miniaturization of the air fryer in the axial direction. The blades are arranged at the top of the mounting sleeve and can be closer to the motor drive board, which is conducive to the blades to take away the heat on the motor drive board in time so that the motor drive board works in a suitable temperature range, thereby improving its performance and life.

[0029] In order to further enhance the firmness and stability of the cooling fan installation, as a preferred embodiment of the present embodiment, the bottom of the installation sleeve is provided with an annular bottom plate extending inward, and the bottom plate abuts against the lower end of the outer rotor housing. On the one hand, the bottom plate can increase the friction between the outer rotor housing and prevent the cooling fan from loosening, and prevent the cooling fan and the outer rotor housing from relative movement to affect the transmission and increase the noise. On the other hand, the bottom plate can transfer the heat at 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 helping to improve the performance and life of the motor.

[0030] 4. The structure adopted by existing motors to solve the assembly tolerance / preload between the rotor and the motor bracket is generally a stamped single-layer corrugated washer, which provides a small preload and compensation tolerance range, is costly, and is prone to increase the mechanical loss of the motor itself and the noise of the motor operation. In order to solve the above problems, as a preferred embodiment, the lower end of the motor bracket extends downward to form a hollow mounting column, the motor body includes a stator, an outer rotor shell surrounded by the outside of the stator, and a rotating shaft passed through and fixed in the center of the outer rotor shell, the rotating shaft passes through the inner cavity of the mounting column, a ball bearing is arranged between the rotating shaft and the inner wall of the mounting column, the ball bearing includes a bearing inner ring, a bearing outer ring and a ball arranged between the bearing inner ring and the bearing outer ring, the bearing outer ring is in interference with the inner wall of the mounting column, and a compression spring surrounding the rotating shaft is arranged between the bearing inner ring and the outer rotor shell along the axial direction of the rotating shaft. The compression spring is used to provide preload and compensate for assembly tolerance when the outer ring of the bearing is fixed, which can improve the vibration noise between the bearing and the motor bracket caused by the inability to fix the outer ring of the bearing due to the need to add a wave washer; after the inner ring of the bearing is subjected to the force of the compression spring, a preload can be applied to the inner ring of the bearing, which can reduce the bearing noise caused by radial and axial movement of the inner ring of the bearing.

[0031] As a preferred embodiment of this embodiment, a boss protruding upward is provided at the bottom center of the outer rotor housing, the boss is provided with a shaft through hole, and the compression spring abuts between the boss and the inner ring of the bearing. The boss can provide an axial pressing force to the compression spring, so that the compression spring is elastically supported between the inner ring of the bearing and the outer rotor housing, ensuring that the compression spring provides a suitable preload force to the inner ring of the bearing, thereby reducing the generation of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 This is a schematic diagram of the assembly structure of a motor bracket, a motor, a cooling fan and a motor drive board in one implementation of the present application.

[0034] Figure 2 for Figure 1 A cross-sectional diagram of the structure.

[0035] Figure 3 This is a schematic diagram of the assembly structure of a compression spring, a bearing inner ring, and an outer rotor housing in one embodiment of the present application.

[0036] Reference numerals:

[0037] 10. Motor body; 11. Cooling fan; 12. Motor bracket; 13. Outer rotor housing; 14. Fan blade; 15. Mounting sleeve; 16. Bottom plate; 141. Base plate; 142. Blade; 17. Motor drive board; 18. First heat dissipation gap; 121. Bracket body; 122. Support arm; 123. Heat dissipation hole; 19. Second heat dissipation gap; 124. Mounting column; 20. Stator; 21. Rotating shaft; 22. Ball bearing; 221. Bearing inner ring; 222. Bearing outer ring; 23. Compression spring; 131. Boss; 132. Through hole. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] like Figures 1 to 3 As shown, the present application provides an air fryer with optimized heat dissipation, including a body, a reflector is arranged in the body, the reflector divides the space in the body into an installation cavity above and a cooking cavity below, a motor bracket 12, a motor, a motor drive board 17 for controlling the operation of the motor and a heat dissipation fan 11 driven by the motor are arranged in the installation cavity, the motor includes a motor body 10, the motor body 10 is hoisted under the motor bracket 12, the heat dissipation fan 11 is fixed on the outer rotor housing 13 of the motor body 10, the motor drive board 17 is fixed at the lower end of the motor bracket 12 and a first heat dissipation gap 18 is arranged between the lower end of the motor drive board 17 and the top of the motor body 10, the heat dissipation fan 11 includes a plurality of fan blades 14, and the fan blades 14 include a horizontal base plate 141 and blades 142 extending upward from the base plate 141.

[0046] The utility model provides an air fryer with optimized heat dissipation, in order to solve the problem of poor heat dissipation of the motor drive board 17, when the motor is hoisted, the motor drive board 17 is arranged between the motor and the motor bracket 12, and a first heat dissipation gap 18 is formed, which can not only avoid heat transfer easily occurring when the motor is too close to the motor drive board 17, but also provide a heat dissipation flow channel, which can increase the contact area between the cold air and the surface of the motor drive board 17, and improve the heat dissipation effect of the motor drive board 17.

[0047] Furthermore, the cooling fan 11 can not only dissipate heat for the motor, but also dissipate heat for the motor drive board 17. Since the blades 142 extend upward and the motor drive board 17 is closer to the blades 142, the heat on the motor drive board 17 can quickly reach the blades 142 and be blown away by the blades 142, thereby accelerating the cooling of the motor drive board 17 and helping to improve its heat dissipation efficiency.

[0048] It should be noted that, based on the setting of the first heat dissipation gap 18, the lower surface of the motor drive plate 17 of the present application is in an open environment, which is conducive to cold air flowing through its surface, and can effectively improve its heat dissipation effect compared to being in a closed environment.

[0049] Specifically, the motor is hoisted between the motor bracket 12 and the reflector. The motor bracket 12 can be a shell structure or a plate structure, and is set according to actual needs. For example, when the motor bracket 12 is a shell structure, the motor bracket 12 and the reflector can be enclosed to form a heat dissipation duct to improve the heat dissipation of the motor, or, when the motor bracket 12 is a plate structure, the motor bracket 12 can be installed on the reflector through the duct cover, and the duct cover and the reflector can be enclosed to form a heat dissipation duct. With the outer rotor motor, the overall structure height of the motor and the cooling 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. The motor body 10 specifically includes a stator 20, an outer rotor housing 13 surrounding the outside of the stator 20, and a rotating shaft 21 that is fixed to the center 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 optimizes the relationship between the motor, the motor bracket 12 and the motor drive board 17 to strengthen the heat dissipation of the motor drive board 17, and of course, it can also improve the heat dissipation of the motor at the same time.

[0050] It should be noted that there are multiple components distributed on the motor drive board 17, and the components are at least arranged on one of the upper surface and the lower surface of the motor drive board 17. When the lower surface of the motor drive board 17 is a smooth structure, the first heat dissipation gap 18 refers to the distance from the lower surface of the motor drive board 17 to the top of the motor body 10. At this time, the first heat dissipation gap 18 is uniform at all horizontal positions; and when the lower surface of the motor drive board 17 is provided with components so that its lower surface is uneven, the first heat dissipation gap 18 includes multiple distances, that is, the distance from the lower surface of the board to the top of the motor body 10, and the distance from the bottom of the component to the top of the motor body 10, wherein the components protruding downward are still isolated from the motor body 10 in the vertical direction (i.e., there is no contact) to avoid affecting the heat dissipation of these components. The top of the motor body 10 may refer to the top of the outer rotor housing 13.

[0051] In order to further improve the heat dissipation effect of the motor drive board 17, as a preferred embodiment, the motor bracket 12 includes a horizontal bracket body 121 and a support arm 122 connected to the periphery of the bracket body 121, and a second heat dissipation gap 19 is provided between the upper end of the motor drive board 17 and the lower end of the bracket body 121, and a penetrating heat dissipation hole 123 connected to the second heat dissipation gap 19 is provided on the bracket body 121.

[0052] like Figure 1 and Figure 2 As shown, by providing the heat dissipation holes 123 and the second heat dissipation gap 19, cold air can flow into the second heat dissipation gap 19 through the heat dissipation holes 123 to dissipate heat on the upper surface of the motor drive board 17, thereby effectively dissipating heat on both the upper and lower surfaces of the motor drive board 17, which can improve the overall heat dissipation effect and heat dissipation efficiency. In addition, the provision of the second heat dissipation gap 19 can prevent the motor drive board 17 from being closely attached to the bracket body 121 and causing heat transfer, thereby achieving heat isolation and preventing the motor drive board 17 from overheating.

[0053] In addition, the cold air flowing into the second heat dissipation gap 19 through the heat dissipation holes 123 can also dissipate heat at the upper end of the motor, thereby enhancing the heat dissipation effect of the motor.

[0054] like Figure 2 As shown, the blades 142 extend upward. When an air inlet is provided on the top of the motor bracket 12, it is beneficial for the blades 142 to absorb air, which can promote the cold air to flow into the second heat dissipation gap 19 to dissipate heat for the motor drive board 17, thereby improving the heat dissipation efficiency.

[0055] Among them, the bracket body 121 provides conditions for the installation of the motor and the motor drive board 17, and the support arm 122 provides conditions for the installation of the motor bracket 12. For example, when an air duct cover (volute structure) is provided above the reflector cover, the motor bracket 12 can be fixed to the top of the air duct cover through the support arm 122. The support arm 122 is provided with a positioning hole, which can be fixed in conjunction with the positioning column on the air duct cover. A plurality of support arms 122 can be arranged at intervals along the circumference, and air vents can be formed between adjacent support arms 122 so that airflow can flow into the air duct cover through the air vents to meet the airflow circulation in the air duct cover.

[0056] It should be noted that when the upper surface of the motor drive board 17 is a smooth structure, the second heat dissipation gap 19 refers to the distance from the upper surface of the motor drive board 17 to the bottom surface of the bracket body 121, and the second heat dissipation gap 19 is uniform at all horizontal positions; and when the upper surface of the motor drive board 17 is provided with components so that its upper surface is uneven, the second heat dissipation gap 19 includes multiple distances, namely, the distance from the upper surface of the board to the bottom surface of the bracket body 121, and the distance from the top of the component to the bottom surface of the bracket body 121, wherein the components protruding upward are still isolated from the bracket body 121 in the vertical direction (i.e., there is no contact) to avoid affecting the heat dissipation of these components. The bottom surface of the bracket body 121 is preferably a plane.

[0057] As a preferred embodiment of the present embodiment, at least part of the heat dissipation holes 123 are arranged above the motor driving board 17 .

[0058] like Figure 2 As shown, in this embodiment, at least part of the heat dissipation holes 123 can be directly opposite to the upper surface of the motor drive board 17, so that cold air can be directly blown to the motor drive board 17, thereby accelerating the heat dissipation of the motor drive board 17. Specifically, at least part of the heat dissipation holes 123 are distributed within the horizontal range covered by the motor drive board 17. Multiple heat dissipation holes 123 can correspond to different areas of the motor drive board 17 to achieve uniform heat dissipation.

[0059] As a preferred example of the present embodiment, the heat dissipation hole 123 is communicated with the first heat dissipation gap 18 .

[0060] In this embodiment, the heat dissipation holes 123, the second heat dissipation gap 19 and the first heat dissipation gap 18 are connected in sequence, so that the cold air passing through the heat dissipation holes 123 can dissipate heat to the upper surface of the motor drive board 17, the lower surface of the motor drive board 17, and the upper end of the motor, thereby improving the utilization rate of the cold air and the heat dissipation efficiency. Specifically, a part of the heat dissipation holes 123 is arranged above the motor drive board 17, and another part of the heat dissipation holes 123 is arranged on the outside of the motor drive board 17 and is located above the motor body 10, so that the cold air can be directly blown to the motor and the motor drive board 17 for heat dissipation at the same time.

[0061] As a preferred embodiment of the present embodiment, the distance of the first heat dissipation gap 18 is 2-3mm. By reasonably setting the distance of the first heat dissipation gap 18, it is possible to avoid heat transfer between components when the distance is too small, and to avoid the difficulty of cold air flowing into the gap to dissipate heat on the lower surface of the motor drive board 17; at the same time, it is possible to avoid the situation that when the distance is too large, on the one hand, the distance from the fan blade 14 to the motor drive board 17 will be increased, causing the path of heat from the motor drive board 17 to the fan blade 14 to be extended, thereby affecting the heat dissipation efficiency; on the other hand, when the axial size of the motor assembly remains unchanged, it is necessary to set the motor drive board 17 upward or the motor body 10 downward, and the motor drive board 17 being arranged upward will cause the motor drive board 17 to be too close to the bracket body 121, which is not conducive to the heat dissipation of the upper surface of the motor drive board 17, and the motor body 10 being arranged downward will make the motor closer to the reflector cover below, and the heat of the reflector cover is easily transferred to the motor, resulting in an increase in the temperature rise of the motor, which is not conducive to the extension of the motor life.

[0062] It is understandable that the second heat dissipation gap 19 can also be set within a certain range, for example, the distance of the second heat dissipation gap 19 is 2-3mm. When the distance of the second heat dissipation gap 19 is too small, the heat on the motor bracket 12 is easily transferred to the motor drive board 17. When the distance of the second heat dissipation gap 19 is too large, if the distance of the first heat dissipation gap 18 remains unchanged, the axial size of the motor bracket 12 needs to be enlarged. At this time, the motor hoisting is prone to shaking, which is not conducive to the stability of the motor operation.

[0063] When the first heat dissipation gap 18 and the second heat dissipation gap 19 include multiple distances, the above value may refer to the minimum distance.

[0064] As a preferred embodiment of the present embodiment, the bracket body 121 is provided with a fixing portion extending downward, and the motor drive board 17 is provided with a matching portion, and the matching portion and the fixing portion cooperate to hoist the motor drive board 17. Under the premise of ensuring that the motor drive board 17 is securely installed, by hoisting the motor drive board 17, the motor drive board 17 can be suspended relative to the bracket body 121, which can avoid heat transfer caused by contact between the two, which is beneficial for the motor drive board 17 to be fully exposed to cold air, thereby ensuring its heat dissipation effect.

[0065] Specifically, in one example, the fixing portion is a screw column, and the matching portion is a screw hole, and the motor drive board 17 can be screwed to the bracket body 121. Alternatively, in another example, the fixing portion is a snap structure, and the matching portion is a structure such as a slot or a platform, and the motor drive board 17 is snapped to the bracket body 121.

[0066] In order to simplify the assembly of the cooling fan 11 and the motor and further improve the heat dissipation efficiency of the motor drive board 17, as a preferred embodiment, the cooling fan 11 includes a mounting sleeve 15 and a plurality of fan blades 14 arranged on the mounting sleeve 15, the mounting sleeve 15 is sleeved and fixed on the outer rotor housing 13, and the plurality of fan blades 14 are arranged on the top of the mounting sleeve 15.

[0067] The cooling fan 11 is sleeved on the outer rotor housing 13 and is firmly installed, which can improve the stability and reliability of the transmission of the cooling fan 11, and is easy to assemble. The overall structure formed by the motor and the cooling fan 11 is compact, which is conducive to reducing the occupation of the installation cavity space and is conducive to the miniaturization of the air fryer in the axial direction. The fan blade 14 is arranged at the top of the installation sleeve 15 and can be closer to the motor drive board 17, which is conducive to the fan blade 14 to take away the heat on the motor drive board 17 in time so that the motor drive board 17 works in a suitable temperature range, improving its performance and life. The installation sleeve 15 is interference fit with the outer rotor housing 13, and the installation sleeve 15 has a certain vertical height to increase the tightness of the fit with the outer rotor housing 13.

[0068] To further enhance the firmness and stability of the installation of the cooling fan 11 , as a preferred embodiment of the present embodiment, an annular bottom plate 16 extending inward is provided at the bottom of the mounting sleeve 15 , and the bottom plate 16 abuts against the lower end of the outer rotor housing 13 .

[0069] like Figures 1 to 3 As shown, on the one hand, the bottom plate 16 can increase the friction between the bottom plate 16 and the outer rotor housing 13 to prevent the cooling fan 11 from loosening, and prevent the cooling fan 11 and the outer rotor housing 13 from moving relative to each other to affect the transmission and increase the noise. On the other hand, the bottom plate 16 can transfer the heat at the bottom of the motor to the fan blades 14, and can also block the heat transfer of the reflective cover, thereby improving the heat dissipation effect of the motor and helping to improve the performance and life of the motor.

[0070] The vertical sleeve portion and the bottom plate 16 of the mounting sleeve 15 can be limited with the outer rotor housing 13 in both radial and axial directions. Even when the mounting sleeve 15 and the outer rotor housing 13 are made of different materials, the sleeve portion 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 sleeve 15 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 to transfer upward to the position of the fan blades 14, so that the fan blades 14 can take away the heat in time, which is conducive to improving the heat dissipation efficiency of the motor. Among them, the sleeve portion and the bottom plate 16 can be integrally formed to improve the overall structural strength.

[0071] The existing motor generally adopts a stamped single-layer corrugated washer to solve the assembly tolerance / preload between the rotor and the motor bracket 12. The preload and compensation tolerance range provided by the stamped single-layer corrugated washer are small, the cost is high, and the mechanical loss of the motor itself is easily increased, and the running noise of the motor is increased. In order to solve the above problems, Figure 3 As shown, as a preferred embodiment, the lower end of the motor bracket 12 extends downward to form a hollow mounting column 124, the motor body 10 includes a stator 20, an outer rotor housing 13 surrounding the outside of the stator 20, and a rotating shaft 21 passing through and fixed at the center of the outer rotor housing 13, the rotating shaft 21 passes through the inner cavity of the mounting column 124, a ball bearing 22 is arranged between the rotating shaft 21 and the inner wall of the mounting column 124, the ball bearing 22 includes a bearing inner ring 221, a bearing outer ring 222 and a ball arranged between the bearing inner ring 221 and the bearing outer ring 222, the bearing outer ring 222 has an interference fit with the inner wall of the mounting column 124, and along the axial direction of the rotating shaft 21, a compression spring 23 surrounding the rotating shaft 21 is arranged between the bearing inner ring 221 and the outer rotor housing 13.

[0072] Specifically, the single-layer corrugated washer realizes the preload force through the points of the concave and convex surface, and has high requirements on the precision of the concave and convex surfaces of the parts. The precision of the concave and convex surfaces will affect the force balance of the preload force. Since the single-layer corrugated washer is stamped, it has a certain plasticity and requires a large compression force to achieve the effect of compensating tolerances and realizing the preload force. For micromotors, it will aggravate the motor's own loss. The conventional single-layer corrugated washer is added between the bearing and the motor bracket 12. The bearing has a certain preload force when pressed down, and a certain gap is required between the outer diameter of the bearing and the motor bracket 12. When the outer diameter of the bearing and the motor bracket 12 are interference fit, the single-layer corrugated washer will lose the effect of the preload force. When the outer diameter of the bearing and the motor bracket 12 are clearance fit, the noise during motor operation will be aggravated.

[0073] The present application adopts a compression spring 23 installed between the bearing inner ring 221 and the outer rotor housing 13, which can make up for the cumulative assembly tolerance between the rotor and the motor bracket 12, and play a role in flexibly supporting the rotor. When the rotor end face is subjected to an action force, the compression spring 23 can damp a part of the impact force, and can prevent the motor from stalling and getting stuck within a certain range. Secondly, for low-power motors, the compression spring 23 has a small rebound pressure, which can reduce the friction between the preloaded components and the rotating components, which is beneficial to reducing the mechanical loss of the motor itself.

[0074] The compression spring 23 of the present application can provide a preload and compensate for assembly tolerances when the bearing outer ring 222 is fixed, thereby improving the vibration noise between the bearing and the motor bracket 12 that was originally generated due to the need to add a corrugated washer, which makes it impossible to fix the bearing outer ring 222; after the bearing inner ring 221 is acted upon by the compression spring 23, a preload can be applied to the bearing inner ring 221, thereby reducing the bearing noise caused by radial and axial movement of the bearing inner ring 221.

[0075] As a preferred embodiment of the present embodiment, an upwardly protruding boss 131 is provided at the bottom center of the outer rotor housing 13 , the boss 131 is provided with a shaft 21 through hole 132 , and the compression spring 23 abuts between the boss 131 and the bearing inner ring 221 .

[0076] like Figure 3 As shown, the boss 131 can provide an axial pressing force to the compression spring 23, so that the compression spring 23 is elastically supported between the bearing inner ring 221 and the outer rotor housing 13, ensuring that the compression spring 23 provides a suitable preload force to the bearing inner ring 221, thereby reducing the generation of noise.

[0077] 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 optimized heat dissipation, comprising a body, a reflector provided in the body, the reflector dividing the space in the body into an upper mounting cavity and a lower cooking cavity, the mounting cavity being provided with a motor bracket, a motor, a motor driving board for controlling the motor, and a heat dissipation fan driven by the motor, characterized in that: The motor includes a motor body, which is suspended below the motor bracket. The cooling fan is fixed to the outer rotor shell of the motor body. The motor drive plate is fixed to the lower end of the motor bracket and a first cooling gap is provided between the lower end of the motor drive plate and the top of the motor body. The cooling fan includes a plurality of fan blades, which include a horizontal base plate and blades extending upward from the base plate.

2. The air fryer with optimized heat dissipation according to claim 1, characterized in that: The motor bracket includes a horizontal bracket body and a support arm connected to the periphery of the bracket body, a second heat dissipation gap is provided between the upper end of the motor drive plate and the lower end of the bracket body, and a penetrating heat dissipation hole connected to the second heat dissipation gap is provided on the bracket body.

3. The air fryer with optimized heat dissipation according to claim 2, characterized in that: At least part of the heat dissipation holes are arranged above the motor driving board.

4. The air fryer with optimized heat dissipation according to claim 2, characterized in that: The heat dissipation hole is communicated with the first heat dissipation gap.

5. The air fryer with optimized heat dissipation according to claim 2, characterized in that: The distance of the first heat dissipation gap is 2-3 mm; And / or, the distance of the second heat dissipation gap is 2-3 mm.

6. The air fryer with optimized heat dissipation according to claim 2, characterized in that: The bracket body is provided with a fixing portion extending downward, and the motor drive board is provided with a matching portion, and the matching portion and the fixing portion cooperate to enable the motor drive board to be hoisted.

7. The air fryer with optimized heat dissipation according to claim 1, characterized in that: The heat dissipation fan comprises a mounting sleeve and a plurality of fan blades arranged on the mounting sleeve. The mounting sleeve is sleeved and fixed on the outer rotor housing, and the plurality of fan blades are arranged on the top end of the mounting sleeve.

8. The air fryer with optimized heat dissipation according to claim 7, characterized in that: An annular bottom plate extending inward is provided at the bottom of the mounting sleeve, and the bottom plate abuts against the lower end of the outer rotor housing.

9. The air fryer with optimized heat dissipation according to claim 1, characterized in that: The lower end of the motor bracket extends downward to form a hollow mounting column, the motor body includes a stator, an outer rotor shell surrounding the outside of the stator, and a rotating shaft passed through and fixed at the center of the outer rotor shell, the rotating shaft passes through the inner cavity of the mounting column, a ball bearing is arranged between the rotating shaft and the inner wall of the mounting column, the ball bearing includes a bearing inner ring, a bearing outer ring and balls arranged between the bearing inner ring and the bearing outer ring, the bearing outer ring is in interference with the inner wall of the mounting column, and along the axial direction of the rotating shaft, a compression spring surrounding the rotating shaft is arranged between the bearing inner ring and the outer rotor shell.

10. The air fryer with optimized heat dissipation according to claim 9, characterized in that: A boss protruding upward is provided at the bottom center of the outer rotor housing, the boss is provided with a rotating shaft through hole, and the compression spring abuts between the boss and the inner ring of the bearing.

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