Fan blade and cooking equipment

Abstract

The utility model provides a fan blade and cooking equipment, and relates to the technical field of cooking equipment. The fan blade comprises a plurality of blades, each blade comprises an inner end and an outer end, the inner ends are close to the axis of the fan blade, the outer ends are far away from the axis of the fan blade, the size of the inner ends in the axial direction of the fan blade is a first height, and the size of the outer ends in the axial direction of the fan blade is a second height; the second height is greater than the first height. The blades are designed to be in the shape with the low inside and the high outside, the speed increasing and pressurizing capacity of the blades can be enhanced, stripping of high-speed areas on the blades is reduced, the wind speed output from inside to outside on the blades is gradually increased along with increase of the height of the blades, and therefore the flowing speed of high-temperature airflow in the cooking cavity is increased, and the heating rate of the high-temperature airflow to food is increased; the technical effects of improving the heating performance of the cooking equipment and optimizing the quality of cooked food are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooking equipment, in particular to a fan blade and cooking equipment. Background Art

[0002] In cooking equipment with hot air heating function, food needs to be cooked through hot air circulation formed by the disturbance of the rotating mechanism.

[0003] In the related art, a fan blade is selected as a rotating mechanism, wherein the blades on the fan blade are equal-height blades, and the heights of the inner and outer ends of the fan blade are the same.

[0004] However, the ability of contour blades to accelerate airflow is limited, resulting in technical problems such as low heating efficiency and poor heating effect. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the first aspect of the present invention provides a fan blade.

[0007] A second aspect of the present invention provides a cooking device.

[0008] In view of this, the first aspect of the present invention provides a fan blade, which includes: multiple blades, the blade includes an inner end and an outer end, the inner end is close to the axis of the fan blade, and the outer end is far away from the axis of the fan blade; the size of the inner end in the axial direction of the fan blade is a first height, and the size of the outer end in the axial direction of the fan blade is a second height; the second height is greater than the first height.

[0009] This technical solution defines a fan blade comprising a plurality of blades distributed around an axis of the fan blade and extending away from the axis of the fan blade. The end of the blade closest to the axis of the fan blade is the inner end of the blade, and the end of the blade away from the axis of the fan blade is the outer end of the blade. Each blade includes an inner end and an outer end.

[0010] In the axial direction of the fan blade, the height of the inner end of the blade is a first height, the height of the outer end of the blade is a second height, and the second height is greater than the first height.

[0011] By designing the blades to be low inside and high outside, the blades' speed-up and pressure-increasing capabilities can be enhanced, reducing the peeling of the high-speed area on the blades, so that the wind speed output from the inside to the outside of the blades shows an increasing trend with the increase of the blade height, thereby increasing the flow rate of the high-temperature airflow in the cooking cavity, and increasing the heating rate of the high-temperature airflow on the food, so that the outer skin of the food is quickly heated up and becomes brittle, thereby solving the technical problems of low heating efficiency and poor heating effect in related technologies, and achieving the technical effect of improving the heating performance of cooking equipment and optimizing the quality of cooked food.

[0012] In addition, the fan blades provided by the present invention may also have the following additional technical features:

[0013] In some technical solutions of the present invention, optionally, the height of at least part of the blades gradually increases in the direction from the inner end to the outer end.

[0014] In this technical solution, different from the chamfering solution in the aforementioned technical solution, at least part of the blades have continuously increasing height from the inner end to the outer end. For example, you can choose a blade whose height continuously increases from the inner end to the outer end, or you can choose a blade whose height gradually increases in the front half and remains unchanged in the back half, or you can choose a blade whose height remains unchanged in the front half and gradually increases in the back half.

[0015] By setting blades with at least partially increasing heights, the blades' speed-up and pressure-increasing capabilities can be enhanced, as well as the blades' speed-up and pressure-increasing uniformity can be improved, reducing the peeling of high-speed areas on the blades, so that the wind speed output from the inside to the outside of the blades shows an increasing trend with increasing blade height, thereby increasing the flow rate of the high-temperature airflow in the cooking cavity, increasing the heating rate of the high-temperature airflow on food, and causing the food's skin to heat up quickly and become brittle, thereby solving the technical problems of low heating efficiency and poor heating effect existing in related technologies, and achieving the technical effect of improving the heating performance of cooking equipment and optimizing the quality of cooked food.

[0016] In some technical solutions of the present invention, optionally, the outer end is provided with a chamfer, and the chamfer is a rounded corner.

[0017] In this technical solution, a chamfer is provided at the outer end of the blade, and the chamfer extends a distance from the outer end of the blade toward the inner end of the blade. After the fan blade is installed on the cooking equipment, the outer end of the blade faces outward, and the user is more likely to touch the outer end than the inner end.

[0018] The chamfer prevents users from being scratched by sharp blades when touching the blades, thereby achieving the technical effect of improving the safety of the cooking device. At the same time, the chamfer reduces the probability of interference between the outer end of the blade and the cover outside the fan blade, thereby improving the operating reliability of the fan blade.

[0019] On this basis, the chamfer is a rounded corner, that is, the chamfer includes an arc surface. By setting the arc surface, the protection effect of the chamfer on the user can be enhanced.

[0020] In some technical solutions of the present invention, optionally, the fan blades are centrifugal wind wheels; and the blades are forward blades.

[0021] In this technical solution, the fan blades are centrifugal impellers, which draw air in axially and out radially. By configuring the fan blades as centrifugal impellers, the centrifugal force generated during rotation increases the pressure and speed of the air, thereby increasing the velocity of the high-temperature airflow within the cooking chamber and improving food heating efficiency.

[0022] Specifically, on the centrifugal wind wheel, the blades are forward blades, and the centrifugal blades whose geometric angle of the blade outlet is greater than 90° are forward blades. By setting the blades as forward blades, the pressurization and acceleration effect of the blades on the high-temperature airflow can be improved.

[0023] A second aspect of the present invention provides a cooking device, comprising: a fan blade according to any of the above technical solutions; a main body, wherein the main body includes a cooking cavity, and the fan blade is arranged on the main body, and is used to blow airflow into the cooking cavity by rotating.

[0024] In this technical solution, a cooking device is defined that is provided with fan blades in any of the above-mentioned technical solutions. Therefore, the cooking device has the advantages of the fan blades in any of the above-mentioned technical solutions, and can achieve the technical effects that can be achieved by the fan blades in any of the above-mentioned technical solutions. To avoid repetition, it will not be repeated here.

[0025] Among them, the cooking equipment can quickly heat the surface of food through high-temperature airflow to obtain food with a crispy skin and attractive appearance. Specific cooking equipment includes: air fryers and ovens.

[0026] The cooking device includes a body and fan blades. The body is the main structure of the cooking device, forms the outer surface of the cooking device, and encloses a cooking cavity in the body. Food is cooked in the cooking cavity.

[0027] The fan blades have an outlet side and a return side. The outlet side is located around the fan blades, while the return side is located on the side of the fan blades facing the cooking cavity. The directional high-temperature airflow consists of both outlet and return air. When the fan blades rotate, the outlet airflow first diffuses outward, then flows downward along the side walls of the cooking cavity. It then converges toward the center of the cooking cavity, heating the food and forming a return airflow that flows toward the fan blades.

[0028] In some technical solutions of the present invention, optionally, the cooking device also includes: a cover body, which is arranged on the outside of the fan blade, and the cover body includes an air outlet, which is located on the circumferential side of the fan blade, and the size of the air outlet in the circumferential direction of the fan blade is larger than the size of the air outlet in the axial direction of the fan blade.

[0029] In this technical solution, a cover is positioned outside the fan blades and is equipped with an air outlet and return air vent. The air outlet is located on the outlet side of the fan blades, and the return air vent is located on the return side of the fan blades. The outgoing airflow must pass through the air outlet to the outside of the cover, and the corresponding return airflow must enter the cover through the return air vent. The cover protects the outside of the fan blades, preventing the rotating fan blades from contacting food and preventing scratches from the fan blades when storing or removing food or cleaning the cooking chamber. The cover also acts as a grease barrier on the outside of the fan blades, thereby improving the cleanliness of the fan blades and extending the cleaning cycle.

[0030] On this basis, the size of the air outlet in the circumferential direction of the fan blade is the width of the air outlet, and the size of the air outlet in the axial direction of the fan blade is the height of the air outlet, where the width of the air outlet needs to be greater than the height of the air outlet.

[0031] Compared to longitudinal openings, the transverse air outlets in this application, which are wider than they are tall, better align with the flow direction of the airflow around the fan blades, thereby reducing wind resistance to the airflow and increasing the velocity of the airflow. Furthermore, transverse air outlets, which are wider than they are tall, can guide the airflow, thereby optimizing the wind field characteristics within the cooking cavity and further increasing the velocity of the high-temperature airflow within the cooking cavity.

[0032] It can be seen that this technical solution can improve the heating rate and uniformity of food in the cooking cavity by setting an air outlet with a width greater than the height, thereby achieving the technical effect of improving the quality of cooked food and improving the practicality of the cooking equipment.

[0033] Specifically, in this technical solution, the air outlet can be a vertically opened strip hole, or a special-shaped hole, such as an elliptical hole or a diamond hole. In this regard, this technical solution does not impose a rigid restriction on the shape of the air outlet, and it only needs to meet the size requirement that the width is greater than the height.

[0034] In some technical solutions of the present invention, optionally, the air outlet is strip-shaped; the angle between the tangential direction of the air outlet and the axial direction of the fan blade is in the range of: greater than 45° and less than or equal to 90°.

[0035] In this technical solution, the air outlet is strip-shaped, that is, the air outlet extends in a single direction, and the extending direction corresponds to the tangential direction of the air outlet.

[0036] On this basis, the angle between the tangential direction of the air outlet and the axial direction of the fan blade must be greater than 45° and less than or equal to 90°.

[0037] By limiting the above-mentioned angle range, it can be ensured that the size of the strip-shaped air outlet in the tangential direction is larger than the size in the axial direction, so as to reduce the wind resistance of the air outlet to the outlet air flow and improve the air outlet's guiding effect on the outlet air flow.

[0038] Specifically, the angle between the tangential direction of the air outlet and the axial direction of the fan blade can be adjusted according to the shape of the blades on the fan blade, the orientation of the blades and the number of blades to further reduce wind resistance and improve the diversion effect.

[0039] Specifically, the tangential direction of the air outlet is perpendicular to the axial direction of the fan blade, that is, the air outlet extends in the tangential direction of the fan blade.

[0040] By setting a horizontal air outlet with a tangential direction perpendicular to the axial direction of the fan blade, the shape of the air outlet can be adapted to the centrifugal fan wheel. On the one hand, the wind resistance is reduced to increase the flow rate of the air flow that diffuses from the lateral side of the fan wheel to the surrounding areas. On the other hand, the wind field characteristics in the cooking cavity are optimized by enhancing the guiding effect of the air flow, and the probability of turbulence and turbulence problems in the cooking cavity is reduced, thereby achieving the technical effect of improving the cooking effect of the cooking equipment and improving the practicality of the cooking equipment.

[0041] Specifically, the ratio of the width of the air outlet to the height of the air outlet must be greater than 1 and less than or equal to 20.

[0042] By limiting the ratio of the width of the air outlet to the height of the air outlet to be greater than 1, the resistance of the air outlet to the outlet air flow can be effectively reduced, and the guiding effect of the air outlet on the outlet air flow can be improved, thereby increasing the air flow velocity in the cooking cavity and improving the heating efficiency of food.

[0043] By limiting the ratio of the width of the air outlet to the height of the air outlet to be less than or equal to 20, the size of a single air outlet can be controlled on the basis of ensuring the low wind resistance and high flow diversion performance requirements of the air outlet, ensuring that the cover can provide effective protection for the inner blades, preventing food and users from contacting the inner fan blades through the air outlet, and improving the cover's grease blocking effect.

[0044] Specifically, the ratio of the size of the air outlet in the tangential direction of the fan blade to the size of the air outlet in the axial direction of the fan blade is 3, 4 or 5.

[0045] In some technical solutions of the present invention, optionally, the cover body includes an air outlet array, the air outlet array includes multiple air outlets, and the multiple air outlets in the same air outlet array are evenly distributed in the circumferential direction of the fan blade; the number of air outlet arrays is multiple; the multiple air outlet arrays are distributed in the axial direction of the fan blade; the air outlets on two adjacent air outlet arrays are staggered in the tangential direction of the fan blade.

[0046] In this technical solution, multiple air outlets form an air outlet array, and at least one air outlet array is provided on the cover body, wherein multiple air outlets belonging to the same air outlet array are spaced apart in the circumferential direction of the fan blade, and multiple air outlets are evenly distributed around the fan blade, that is, the angles between two adjacent air outlets are equal.

[0047] By setting up an air outlet array consisting of multiple air outlets, the air outlets can cover multiple angles around the fan blades, so that the air flow blown out by the fan blades can be diffused into the cooking cavity in multiple directions, thereby improving the heating uniformity of the food and improving the quality of the food.

[0048] By evenly distributing multiple air outlets in the air outlet array around the fan blades, the uniformity of the air outlet from the hood can be further improved, thereby optimizing the wind field characteristics in the cooking cavity, improving the uniformity of heating the food by the high-temperature airflow, and reducing the probability of turbulence and turbulence problems in the cooking cavity.

[0049] Specifically, a plurality of air outlet arrays are provided on the cover body, and the plurality of air outlet arrays are arranged at intervals in the circumferential direction of the fan blades.

[0050] For example, the cover includes three air outlet arrays, one of which is located in the middle section of the cover, and the remaining two air outlet arrays are located on the upper and lower sides respectively.

[0051] By increasing the number of air outlet arrays, the area covered by the air outlet can be expanded. On the one hand, the probability of dead corners on the cover is reduced, and on the other hand, the resistance of the cover to the air flow is reduced, thereby increasing the heating rate of food and improving the quality of food by increasing the flow rate of the air flow.

[0052] Specifically, the cover includes a bottom plate and side plates, the side plates are connected to the edge of the bottom plate, and the side plates surround the bottom plate. After assembly, the bottom plate is located on the side of the fan blade facing the cooking cavity, and the side plates are located around the fan blade.

[0053] Among them, the air outlet is arranged on the side panel, and the return air outlet is arranged on the bottom panel. The directional high-temperature airflow includes the outlet airflow and the return airflow. When the fan blades rotate, the outlet airflow first diffuses to the surroundings, passes through the side panel through the air outlet, and contacts the side wall of the cooking cavity, and flows from top to bottom under the pressure of the side wall of the cooking cavity. Thereafter, the airflow converges to the central area of ​​the cooking cavity, and forms a return airflow flowing toward the fan blades after heating the food. The return airflow enters the interior of the cover through the return air outlet to participate in the next high-temperature airflow heating cycle.

[0054] The side panels and bottom plate protect the outer edges of the fan blades, preventing them from contacting food and scratching the user when loading or unloading food or cleaning the cooking chamber. The cover also blocks grease from the outer edges of the fan blades, improving their cleanliness and extending cleaning cycles.

[0055] In this technical solution, when the cover body has multiple air outlet arrays distributed along the axial direction of the fan blade, the air outlets of two adjacent air outlet arrays along the axial direction of the fan blade are staggered, that is, there is a deflection angle between the two adjacent air outlet arrays in the circumferential direction of the fan blade.

[0056] Specifically, the deflection angle can be designed according to the size of the air outlet, the number of air outlets in the air outlet array, and the number of air outlet arrays. This technical solution does not impose any rigid restrictions on this, and it only needs to meet the requirements of the staggered setting.

[0057] By staggering the two adjacent air outlet arrays, the wind resistance of the air outlet to the air flow can be further reduced, thereby increasing the air outlet speed of the cover and improving the heating efficiency of the food. At the same time, staggering the two adjacent air outlet arrays can also reduce the probability of turbulence and turbulence in the cooking cavity, thereby improving the heating uniformity of the food and improving the quality of the cooked food.

[0058] In some technical solutions of the present invention, optionally, the fan blades have magnetic conductivity, and the cooking device includes an electromagnetic disk, which is arranged opposite to the fan blades.

[0059] In this technical solution, the fan blades are made of a material having magnetic conductivity, and specifically, metal material can be selected to make the fan blades.

[0060] On this basis, the cooking device further comprises an electromagnetic disk, which is arranged on the main body, and the electromagnetic disk and the magnetically conductive fan blades are arranged opposite to each other.

[0061] When powered, the electromagnetic disk generates an electromagnetic field in the fan blade area. This field heats the magnetically conductive fan blades, causing them to heat up. The high-temperature blades not only create a directional airflow during rotation, but also heat the airflow, raising its temperature and thereby improving the heating efficiency of the cooking device. Furthermore, compared to heat pipes used in radiant heating solutions, the electromagnetic disk generates relatively little heat, which helps lower the external surface temperature of the cooking device, reducing the risk of burns and ultimately improving the safety of the cooking device.

[0062] On this basis, if the fan blades have a heating function, the fan blades can be increased in size to improve the efficiency of the airflow. In this regard, the large-sized fan blades and the provision of horizontally arranged air outlets can improve the efficiency of the airflow while also providing the fan blades with a heating function, thereby further improving the heating efficiency of the cooking device.

[0063] In some technical solutions of the present invention, optionally, the cover has magnetic conductivity, and the cooking device includes an electromagnetic disk, which is arranged opposite to the cover.

[0064] In this technical solution, the cover body is made of a material having magnetic conductivity, and specifically a metal material can be selected to prepare the cover body.

[0065] On this basis, the cooking device further includes an electromagnetic disk, which is arranged on the main body, and the electromagnetic disk and the magnetic cover are arranged opposite to each other.

[0066] When powered, the electromagnetic disk generates an electromagnetic field in the area surrounding the cover. This field heats the magnetic cover, which not only protects the fan blades but also heats the airflow, increasing its temperature and thereby improving the heating efficiency of the cooking device. Furthermore, compared to heat pipes used in radiant heating solutions, the electromagnetic disk generates relatively little heat, which helps lower the external surface temperature of the cooking device, reducing the risk of burns and ultimately improving the safety of the cooking device.

[0067] In some technical solutions of the present invention, optionally, the cover body is rotatable.

[0068] In this technical solution, the cover is rotatably connected to the main body, and the cover and the fan blades rotate coaxially.

[0069] By setting up a cover that can rotate along with the fan blades, the air flow can be blown out of the cover evenly through multiple air outlets distributed circumferentially on the cover, avoiding the high-temperature air flow flowing in a certain direction from being blocked for a long time by the area on the cover where no air outlet is opened, thereby achieving the technical effect of improving the heating uniformity of the cooking equipment.

[0070] In some technical solutions of the present invention, optionally, the cooking device further includes: a guide plate, which is arranged on the peripheral side of the cover body and is used to guide the air flow to flow toward the peripheral side of the cover body.

[0071] In this technical solution, a guide plate is provided on the peripheral side of the cover body, and the guide plate is arranged opposite to the air outlet. The extension direction of the cover body is adapted to the flow direction of the airflow discharged from the air outlet, so that the airflow is guided by the guide plate and the rate of diffusion of the airflow to the four sides of the cover body is increased, thereby achieving the technical effect of improving the internal gas flow efficiency of the cooking equipment and increasing the heating rate of the cooking equipment.

[0072] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0074] Figure 1 A schematic structural diagram of a fan blade according to an embodiment of the present invention is shown;

[0075] Figure 2 A schematic structural diagram of a fan blade according to an embodiment of the present invention is shown;

[0076] Figure 3 A schematic structural diagram of a fan blade according to an embodiment of the present invention is shown;

[0077] Figure 4 A schematic structural diagram of a blade according to an embodiment of the present utility model is shown;

[0078] Figure 5 A schematic structural diagram of a cover body according to an embodiment of the present utility model is shown;

[0079] Figure 6 A schematic structural diagram of a cover body according to an embodiment of the present utility model is shown;

[0080] Figure 7 A schematic structural diagram of a cooking device according to an embodiment of the present invention is shown;

[0081] Figure 8 An exploded view of a cooking device according to an embodiment of the present invention is shown;

[0082] Figure 9 shows a wind field streamline diagram of a cooking device in the related art;

[0083] Figure 10 shows a wind field streamline diagram of a cooking device in the related art;

[0084] Figure 11 shows a wind field streamline diagram of a cooking device according to an embodiment of the present utility model;

[0085] Figure 12 A wind field streamline diagram of a cooking device according to an embodiment of the present invention is shown.

[0086] in, Figures 1 to 8 The corresponding relationship between the reference numerals and component names is as follows:

[0087] 100 cooking device, 110 main body, 1102 cooking cavity, 112 pot body, 114 cover body, 1142 through hole, 116 light-transmitting plate, 120 fan blade, 122 blade, 1222 inner end, 1224 outer end, 1229 chamfer, 130 cover body, 1302 air outlet, 1304 air outlet array, 132 bottom plate, 134 side plate, 1322 return air outlet, 140 supporting component, 150 electromagnetic disk, 160 guide plate. DETAILED DESCRIPTION

[0088] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0089] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0090] Refer to the following Figures 1 to 12 The fan blade and cooking device according to some embodiments of the present invention are described.

[0091] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, an embodiment of the present invention provides a fan blade 120, which includes: a plurality of blades 122, the blade 122 including an inner end 1222 and an outer end 1224, the inner end 1222 is close to the axis of the fan blade 120 ( Figure 1 The outer end 1224 is away from the axis of the blade 120, and the dimension of the inner end 1222 in the axial direction of the blade 120 is a first height ( Figure 4 H1 in the figure), the dimension of the outer end 1224 in the axial direction of the blade 120 is the second height ( Figure 4 The second height is greater than the first height.

[0092] Figure 1 、 Figure 3 and Figure 4 , arrow a shows the axial direction of the blade 120 .

[0093] This technical solution defines a fan blade 120, which includes a plurality of blades 122 distributed around the axis of the fan blade 120 and extending away from the axis of the fan blade 120. The end of the blade 122 closer to the axis of the fan blade 120 is an inner end 1222 of the blade 122, and the end of the blade 122 farther from the axis of the fan blade 120 is an outer end 1224 of the blade 122. Each blade 122 includes an inner end 1222 and an outer end 1224.

[0094] In the axial direction of the blade 120 , the height of the inner end 1222 of the blade 122 is a first height, the height of the outer end 1224 of the blade 122 is a second height, and the second height is greater than the first height.

[0095] By designing the blades 122 to be low inside and high outside, the speed-up and pressure-increasing capabilities of the blades 122 can be enhanced, and the peeling of the high-speed area on the blades 122 can be reduced, so that the wind speed output from the inside to the outside of the blades 122 shows an increasing trend with the increase of the height of the blades 122, thereby increasing the flow rate of the high-temperature airflow in the cooking cavity 1102, and increasing the heating rate of the high-temperature airflow on the food, so that the outer skin of the food is quickly heated and brittle, thereby solving the technical problems of low heating efficiency and poor heating effect in the related technology, and achieving the technical effect of improving the heating performance of the cooking equipment 100 and optimizing the quality of the cooked food.

[0096] In some technical solutions of the present invention, optionally, the height of at least part of the blades 122 gradually increases in the direction from the inner end 1222 to the outer end 1224 .

[0097] In this technical solution, different from the chamfering solution in the aforementioned technical solution, at least part of the blades 122 have a height that continuously increases in the direction from the inner end 1222 to the outer end 1224. For example, a blade 122 whose height continuously increases from the inner end 1222 to the outer end 1224 can be selected, or a blade 122 whose height gradually increases in the front half and remains unchanged in the back half can be selected, or a blade 122 whose height remains unchanged in the front half and gradually increases in the back half can be selected.

[0098] By setting blades 122 with at least partially increasing heights, the speed-up and pressure-increasing capabilities of the blades 122 can be enhanced, as well as the uniformity of the speed-up and pressure-increasing of the blades 122, reducing the peeling of the high-speed area on the blades 122, so that the wind speed output from the inside to the outside of the blades 122 shows an increasing trend with the increase in the height of the blades 122, thereby increasing the flow rate of the high-temperature airflow in the cooking cavity 1102, and increasing the heating rate of the high-temperature airflow on the food, so that the outer skin of the food is quickly heated and brittle, thereby solving the technical problems of low heating efficiency and poor heating effect in the related technology, and achieving the technical effect of improving the heating performance of the cooking device 100 and optimizing the quality of the cooked food.

[0099] like Figure 4 As shown, in some technical solutions of the present invention, optionally, the outer end 1224 is provided with a chamfer 1229, and the chamfer 1229 is a rounded corner.

[0100] In this technical solution, the outer end 1224 of the blade 122 is provided with a chamfer 1229, and the chamfer 1229 extends a distance from the outer end 1224 of the blade 122 toward the direction of the inner end 1222 of the blade 122. After the fan blade 120 is installed on the cooking device 100, the outer end 1224 on the blade 122 faces outward, and compared with the inner end 1222, the user is more likely to touch the outer end 1224.

[0101] The provision of chamfer 1229 can prevent a user from being scratched by the sharp blade 122 when touching the blade 122, thereby achieving the technical effect of improving the safety of the cooking device 100. At the same time, the chamfer 1229 can reduce the probability of interference between the outer end 1224 of the blade 122 and the cover 130 outside the fan blade 120, thereby improving the operating reliability of the fan blade 120.

[0102] On this basis, the chamfer 1229 is a rounded corner, that is, the chamfer 1229 includes an arc surface. By setting the arc surface, the protection effect of the chamfer 1229 on the user can be enhanced.

[0103] like Figure 1 and Figure 2 As shown, in some technical solutions of the present invention, optionally, the fan blade 120 is a centrifugal wind wheel; and the blade 122 is a forward blade.

[0104] In this technical solution, fan blades 120 are centrifugal impellers, which draw air in axially and out radially. By configuring fan blades 120 as centrifugal impellers, the centrifugal force generated during rotation increases the pressure and speed of the air, thereby increasing the velocity of the high-temperature airflow within cooking cavity 1102 and improving food heating efficiency.

[0105] Specifically, on the centrifugal wind wheel, the blade 122 is a forward blade, and the centrifugal blade 122 whose outlet geometric angle is greater than 90° is a forward blade. By setting the blade 122 as a forward blade, the pressurization and acceleration effect of the blade 122 on the high-temperature airflow can be improved.

[0106] like Figure 7 and Figure 8 As shown, the second aspect of the present invention provides a cooking device 100, which includes: the fan blades 120 in any of the above-mentioned technical solutions; a main body 110, which includes a cooking cavity 1102, and the fan blades 120 are arranged on the main body 110, and the fan blades 120 are used to blow air flow toward the cooking cavity 1102 by rotating.

[0107] In this technical solution, a cooking device 100 is defined that is provided with the fan blades 120 in any of the above-mentioned technical solutions. Therefore, the cooking device 100 has the advantages of the fan blades 120 in any of the above-mentioned technical solutions, and can achieve the technical effects that can be achieved by the fan blades 120 in any of the above-mentioned technical solutions. To avoid repetition, it will not be repeated here.

[0108] The cooking device 100 can quickly heat the surface of food through high-temperature airflow to obtain food with a crispy outer skin and attractive appearance. Specifically, the cooking device 100 includes: an air fryer and an oven.

[0109] The cooking device 100 includes a body 110 and fan blades 120. The body 110 is the main structure of the cooking device 100. The body 110 forms the outer surface of the cooking device 100, and a cooking cavity 1102 is enclosed within the body 110. Food is cooked in the cooking cavity 1102.

[0110] Fan blade 120 includes an outlet side and a return side. The outlet side is located around fan blade 120, and the return side is located on the side of fan blade 120 facing cooking cavity 1102. The directional high-temperature airflow includes an outlet airflow and a return airflow. When fan blade 120 rotates, the outlet airflow first diffuses in all directions, then flows downward along the sidewalls of cooking cavity 1102 after contacting them. The airflow then converges toward the center of cooking cavity 1102, heating the food and forming a return airflow that flows toward fan blade 120.

[0111] like Figure 5 、 Figure 6 and Figure 7 As shown, in some technical solutions of the present invention, optionally, the cooking device 100 also includes: a cover body 130, the cover body 130 is arranged on the outside of the fan blade 120, the cover body 130 includes an air outlet 1302, the air outlet 1302 is located on the peripheral side of the fan blade 120, and the size of the air outlet 1302 in the circumferential direction of the fan blade 120 is larger than the size of the air outlet 1302 in the axial direction of the fan blade 120.

[0112] Figure 5 The middle arrow a shows the axial direction of the fan blade 120, the arrow b shows the circumferential direction of the fan blade 120, L shows the size of the air outlet 1302 in the circumferential direction, and H3 shows the size of the air outlet 1302 in the axial direction.

[0113] Figure 6 The middle arrow c shows the circumferential direction of the fan blade 120.

[0114] Figure 7 The arrow d shows the direction of the outgoing air flow, and the arrow e shows the direction of the return air flow.

[0115] In this technical solution, the cover 130 is arranged outside the fan blades 120, and is provided with an air outlet 1302 and a return air outlet 1322. The air outlet 1302 is located on the air outlet side of the fan blades 120, and the return air outlet 1322 is located on the return air side of the fan blades 120. The outgoing airflow needs to pass through the air outlet 1302 to the outside of the cover 130, and the return airflow needs to enter the cover 130 from the return air outlet 1322. The cover 130 can play a protective role on the outside of the fan blades 120. On the one hand, it prevents the rotating fan blades 120 from contacting food. On the other hand, it can prevent the user from being scratched by the fan blades 120 when storing or removing food or cleaning the cooking chamber 1102. The cover 130 can also block grease on the outside of the fan blades 120, thereby improving the cleanliness of the fan blades 120 and extending the cleaning cycle of the fan blades 120.

[0116] On this basis, the size of the air outlet 1302 in the circumferential direction of the fan blade 120 is the width of the air outlet 1302, and the size of the air outlet 1302 in the axial direction of the fan blade 120 is the height of the air outlet 1302, where the width of the air outlet 1302 needs to be greater than the height of the air outlet 1302.

[0117] Compared to longitudinal openings, the transverse air outlets 1302 of the present invention, which are wider than they are tall, better align with the flow direction of the outgoing airflow around the fan blades 120, thereby reducing the wind resistance of the outgoing airflow through the air outlets 1302 and increasing the outgoing airflow velocity. Furthermore, the transverse air outlets 1302, which are wider than they are tall, can guide the outgoing airflow, thereby optimizing the wind field characteristics within the cooking cavity 1102 and further increasing the flow velocity of the high-temperature airflow within the cooking cavity 1102.

[0118] It can be seen that this technical solution can improve the heating rate and heating uniformity of food in the cooking cavity 1102 by setting the air outlet 1302 with a width greater than the height, thereby achieving the technical effect of improving the quality of cooked food and improving the practicality of the cooking device 100.

[0119] Specifically, in this technical solution, the air outlet 1302 can be a vertically opened strip hole, or a special-shaped hole, such as an elliptical hole or a diamond hole. In this regard, this technical solution does not impose a rigid restriction on the shape of the air outlet 1302, and it only needs to meet the size requirement that the width is greater than the height.

[0120] Figure 9 and Figure 10 The figure shows the wind field streamline diagram of the cooking device 100 in the related art. In the related art, the ascending blades 122 are selected, and the openings on the safety cover are vertical holes, that is, the size in the axial direction is larger than the size in the circumferential direction. It can be seen that in this case, the wind field flow velocity in the cooking cavity 1102 is low, and the angle between the air outlet direction and the horizontal direction is small, which is not conducive to efficient heating of food.

[0121] Figure 11 and Figure 12 A wind field streamline diagram of a cooking device 100 according to an embodiment of the present invention is shown. It can be seen that when a blade 122 is selected with a lower first height at the inner end 1222 and a higher second height at the outer end 1224, and a transverse opening with a circumferential dimension greater than an axial dimension is provided, the wind field flow velocity in the cooking cavity 1102 is higher, and the angle between the air outlet direction and the horizontal direction is larger, which can improve the heating rate of food.

[0122] On this basis, under the same cooking conditions, Figure 9 、 Figure 10 Program and Figure 11 、 Figure 12 The heating effect of the scheme can be shown in Table 1 below. It can be seen that the scheme proposed in this application can improve the dehydration rate of French fries, thereby optimizing the taste of French fries.

[0123] Table 1

[0124] plan Warm-up time Flipping time Dehydration rate Figure 9 、 Figure 10 plan No preheating Do not flip 45％ Figure 11 、 Figure 12 plan No preheating Do not flip 51％

[0125] In some technical solutions of the present invention, optionally, the air outlet 1302 is strip-shaped; the angle between the tangential direction of the air outlet 1302 and the axial direction of the fan blade 120 is in the range of: greater than 45° and less than or equal to 90°.

[0126] In this technical solution, the air outlet 1302 is strip-shaped, that is, the air outlet 1302 extends in a single direction, and the extending direction corresponds to the tangential direction of the air outlet 1302 .

[0127] On this basis, the angle between the tangential direction of the air outlet 1302 and the axial direction of the fan blade 120 needs to be greater than 45° and less than or equal to 90°.

[0128] By limiting the above-mentioned angle range, it can be ensured that the size of the strip-shaped air outlet 1302 in the tangential direction is larger than the size in the axial direction, thereby reducing the wind resistance of the air outlet 1302 to the outlet airflow and improving the air outlet 1302's guiding effect on the outlet airflow.

[0129] Specifically, the angle between the tangential direction of the air outlet 1302 and the axial direction of the fan blade 120 can be adjusted according to the shape of the blade 122 on the fan blade 120, the orientation of the blade 122 and the number of blades 122 to further reduce wind resistance and improve the diversion effect.

[0130] Specifically, the tangential direction of the air outlet 1302 is perpendicular to the axial direction of the fan blade 120 , that is, the air outlet 1302 extends in the tangential direction of the fan blade 120 .

[0131] By setting a horizontal air outlet 1302 whose tangential direction is perpendicular to the axial direction of the fan blade 120, the shape of the air outlet 1302 can be adapted to the centrifugal wind wheel. On the one hand, the flow rate of the outlet air flow that diffuses from the lateral side of the wind wheel to the surrounding areas is increased by reducing the wind resistance. On the other hand, the wind field characteristics in the cooking cavity 1102 are optimized by enhancing the guiding effect of the outlet air flow, and the probability of turbulence and turbulent flow problems in the cooking cavity 1102 is reduced, thereby achieving the technical effect of improving the cooking effect of the cooking device 100 and improving the practicality of the cooking device 100.

[0132] Specifically, the ratio of the width of the air outlet 1302 to the height of the air outlet 1302 needs to be greater than 1 and less than or equal to 20.

[0133] By limiting the ratio of the width of the air outlet 1302 to the height of the air outlet 1302 to be greater than 1, the resistance of the air outlet 1302 to the outlet air flow can be effectively reduced, and the guiding effect of the air outlet 1302 on the outlet air flow can be improved, thereby increasing the air flow velocity in the cooking cavity 1102 and improving the heating efficiency of food.

[0134] By limiting the ratio of the width of the air outlet 1302 and the height of the air outlet 1302 to be less than or equal to 20, the size of a single air outlet 1302 can be controlled on the basis of ensuring the low wind resistance requirements and high flow guidance performance requirements of the air outlet 1302, ensuring that the cover body 130 can provide effective protection for the inner blades 122, preventing food and users from contacting the inner fan blades 120 through the air outlet 1302, and improving the grease blocking effect of the cover body 130.

[0135] Specifically, the ratio of the size of the air outlet 1302 in the tangential direction of the fan blade 120 to the size of the air outlet 1302 in the axial direction of the fan blade 120 includes 3, 4 or 5.

[0136] like Figure 5 、 Figure 6 and Figure 7 As shown, in some technical solutions of the present invention, optionally, the cover body 130 includes an air outlet array 1304, the air outlet array 1304 includes multiple air outlets 1302, and the multiple air outlets 1302 in the same air outlet array 1304 are evenly distributed in the circumferential direction of the fan blade 120; the number of the air outlet arrays 1304 is multiple; and the multiple air outlet arrays 1304 are distributed in the axial direction of the fan blade 120.

[0137] In this technical solution, multiple air outlets 1302 form an air outlet array 1304, and at least one air outlet array 1304 is provided on the cover body 130, wherein the multiple air outlets 1302 belonging to the same air outlet array 1304 are spaced apart in the circumferential direction of the fan blade 120, and the multiple air outlets 1302 are evenly distributed around the fan blade 120, that is, the angles between two adjacent air outlets 1302 are equal.

[0138] By setting up an air outlet array 1304 composed of multiple air outlets 1302, the air outlet 1302 can cover multiple angles around the fan blades 120, so that the air flow blown out by the fan blades 120 can be diffused into the cooking cavity 1102 in multiple directions, thereby improving the heating uniformity of the food and improving the quality of the food.

[0139] By evenly distributing the multiple air outlets 1302 in the air outlet array 1304 around the fan blades 120, the uniformity of the air outlet from the cover 130 can be further improved, thereby optimizing the wind field characteristics within the cooking cavity 1102, improving the uniformity of heating the food by the high-temperature airflow, and reducing the probability of turbulence and turbulent flow problems within the cooking cavity 1102.

[0140] Specifically, a plurality of air outlet arrays 1304 are provided on the cover body 130 , and the plurality of air outlet arrays 1304 are arranged at intervals in the circumferential direction of the fan blades 120 .

[0141] For example, the cover body 130 includes three air outlet arrays 1304 , one of which is located in the middle section of the cover body 130 , and the remaining two air outlet arrays 1304 are located at the upper and lower sides, respectively.

[0142] By increasing the number of air outlet arrays 1304, the area covered by the air outlet 1302 can be expanded. On the one hand, the probability of dead corners appearing on the cover body 130 is reduced, and on the other hand, the resistance of the cover body 130 to the air flow is reduced, thereby increasing the heating rate of food and improving the quality of food by increasing the flow rate of the air flow.

[0143] Specifically, the cover 130 includes a bottom plate 132 and side plates 134. The side plates 134 are connected to the edges of the bottom plate 132 and surround the bottom plate 132. After assembly, the bottom plate 132 is located on the side of the fan blade 120 facing the cooking cavity 1102, and the side plates 134 are located around the fan blade 120.

[0144] Among them, the air outlet 1302 is set on the side panel 134, and the return air outlet 1322 is set on the bottom plate 132. The directional high-temperature airflow includes an outlet airflow and a return airflow. When the fan blade 120 rotates, the outlet airflow first diffuses to the surroundings, passes through the side panel 134 through the air outlet 1302, and contacts the side wall of the cooking cavity 1102, and flows from top to bottom under the pressure of the side wall of the cooking cavity 1102. Thereafter, the airflow converges toward the central area of ​​the cooking cavity 1102, and forms a return airflow flowing toward the fan blade 120 after heating the food. The return airflow enters the interior of the cover body 130 through the return air outlet 1322 to participate in the next high-temperature airflow heating cycle.

[0145] The side panels 134 and bottom panel 132 protect the outer sides of the fan blades 120, preventing the rotating fan blades 120 from contacting food and preventing the user from being scratched by the fan blades 120 when accessing food or cleaning the cooking chamber 1102. The cover 130 also blocks grease from the outer sides of the fan blades 120, thereby improving the cleanliness of the fan blades 120 and extending the cleaning cycle of the fan blades 120.

[0146] like Figure 5 、 Figure 6 and Figure 7 As shown, in some technical solutions of the present invention, optionally, the air outlets 1302 on two adjacent air outlet arrays 1304 are staggered in the tangential direction of the fan blades 120 .

[0147] In this technical solution, when the cover body 130 has multiple air outlet arrays 1304 distributed along the axial direction of the fan blade 120, the air outlets 1302 of two adjacent air outlet arrays 1304 along the axial direction of the fan blade 120 are staggered, that is, there is a deflection angle between the two adjacent air outlet arrays 1304 in the circumferential direction of the fan blade 120.

[0148] Specifically, the deflection angle can be designed according to the size of the air outlet 1302, the number of air outlets 1302 in the air outlet array 1304, and the number of air outlet arrays 1304. This technical solution does not impose any rigid restrictions on this, and it only needs to meet the requirements of the staggered setting.

[0149] By staggering the two adjacent air outlet arrays 1304, the wind resistance of the air outlet 1302 to the air flow can be further reduced, thereby increasing the air outlet speed of the cover 130 to improve the heating efficiency of the food. At the same time, staggering the two adjacent air outlet arrays 1304 can also reduce the probability of turbulence and turbulence in the cooking cavity 1102, thereby improving the heating uniformity of the food and improving the quality of the cooked food.

[0150] like Figure 8 As shown, in some technical solutions of the present invention, optionally, the main body 110 includes: a pot body 112, the cooking cavity 1102 is located in the pot body 112; a cover body 114, the cover body 114 covers the pot body 112, and the cover body 114 includes a through hole 1142; a light-transmitting plate 116, the light-transmitting plate 116 is provided on the cover body 114, the light-transmitting plate 116 covers the through hole 1142, and the fan blades 120 and the cover body 130 are located on the side of the light-transmitting plate 116 facing the pot body 112.

[0151] In this technical solution, the main body 110 includes a pot body 112 , a cover body 114 and a light-transmitting plate 116 .

[0152] A cooking cavity 1102 is formed inside the pot body 112, and the pot body 112 is used to hold food. When the pot body 112 is installed to a predetermined position, the lid 114 can cover the opening at the top of the pot body 112 to prevent heat from being lost from the opening at the top of the pot body 112.

[0153] Specifically, the inner side of the cover 114 is provided with a coating that can reflect heat radiation, thereby improving the heating efficiency of the food in the pot body 112.

[0154] The fan blades 120 and the cover 130 are arranged on the inner side of the cover 114. A through hole 1142 is provided on the cover 114, and the through hole 1142 is opposite to the fan blades 120. The motor that drives the fan blades 120 to rotate is arranged on the outer side of the cover 114 to prevent the high temperature environment from affecting the normal operation of the motor.

[0155] A light-transmitting plate 116 is provided at the through hole 1142. After assembly, the light-transmitting plate 116 can cover the through hole 1142 to prevent heat from being lost through the through hole 1142. At the same time, the user can observe the food in the pot body 112 through the light-transmitting plate 116, thereby visualizing the entire cooking process, providing convenient conditions for the user to control the cooking process of the food, and thus achieving the technical effect of optimizing the user experience.

[0156] Specifically, the cover plate is a glass plate.

[0157] In this technical solution, a supporting component 140 is provided in the pot body 112 , and the supporting component 140 can lift the food in the pot body 112 to separate the food from the bottom wall of the pot body 112 .

[0158] The support member 140 shortens the distance between the food and the top heat source, thereby increasing the food heating rate. Furthermore, the support member 140 includes air holes for high-temperature airflow, which heats the lower surface of the food through the holes, effectively heating the entire outer surface of the food. Furthermore, when cooking food with a high moisture content, liquid accumulates at the bottom of the pot 112. The support member 140 supports the food, preventing contact between the food and the liquid, thereby maintaining the food's crispy texture and improving food quality.

[0159] Specifically, the supporting component 140 includes a baking pan and a tray.

[0160] like Figure 7 As shown, in some embodiments of the present invention, optionally, the fan blades 120 have magnetic conductivity, and the cooking device 100 includes an electromagnetic disk 150 , which is arranged opposite to the fan blades 120 .

[0161] In this embodiment, the fan blades 120 are made of a material having magnetic conductivity, and specifically, the fan blades 120 can be made of a metal material.

[0162] On this basis, the cooking device 100 further includes an electromagnetic disk 150 . The electromagnetic disk 150 is disposed on the body 110 , and the electromagnetic disk 150 and the magnetically conductive fan blades 120 are disposed opposite to each other.

[0163] When powered, electromagnetic disk 150 generates an electromagnetic field in the area where blades 120 are located. This electromagnetic field heats up the magnetically conductive blades 120, and the high-temperature blades 120, when rotating, not only create a directional airflow but also heat the airflow, increasing its temperature. This improves the heating efficiency of cooking device 100. Furthermore, compared to heat pipes used in radiant heating solutions, electromagnetic disk 150 generates relatively little heat, which helps lower the external surface temperature of cooking device 100, thereby reducing the risk of burns to the user and enhancing the safety of cooking device 100.

[0164] On this basis, if the fan blades 120 have a heating function, the efficiency of the fan blades 120 in heating the airflow can be increased by increasing the size of the fan blades 120. In this regard, providing horizontally arranged air outlets with large-sized fan blades 120 can improve the efficiency of the airflow while maintaining the heating function of the fan blades 120, thereby further improving the heating efficiency of the cooking device 100.

[0165] like Figure 7 As shown, in some embodiments of the present invention, optionally, the cover 130 has magnetic conductivity, and the cooking device 100 includes an electromagnetic disk 150 , which is arranged opposite to the cover 130 .

[0166] In this embodiment, the cover body 130 is made of a material having magnetic conductivity, and specifically, the cover body 130 can be made of a metal material.

[0167] On this basis, the cooking device 100 further includes an electromagnetic disk 150 . The electromagnetic disk 150 is disposed on the body 110 , and the electromagnetic disk 150 and the magnetic cover 130 are disposed opposite to each other.

[0168] When powered, electromagnetic disk 150 generates an electromagnetic field in the area where cover 130 is located. This electromagnetic field heats up the magnetically conductive cover 130, which not only protects fan blades 120 but also heats the airflow, increasing its temperature and thereby improving the heating efficiency of cooking device 100. Furthermore, compared to heat pipes used in radiant heating solutions, electromagnetic disk 150 generates relatively little heat, which helps lower the external surface temperature of cooking device 100, thereby reducing the risk of burns to the user and improving the safety of cooking device 100.

[0169] In some embodiments of the present invention, optionally, the cover body 130 is rotatable.

[0170] In this embodiment, the cover 130 is rotatably connected to the body 110 , and the cover 130 and the fan blades 120 rotate coaxially.

[0171] By providing a cover body 130 that can rotate along with the fan blades 120, the air flow can be evenly blown out of the cover body 130 through multiple air outlets distributed circumferentially on the cover body 130, thereby preventing the high-temperature air flow flowing in a certain direction from being blocked for a long time by the area on the cover body 130 where no air outlet is provided, thereby achieving the technical effect of improving the heating uniformity of the cooking device 100.

[0172] like Figure 7 As shown, in some embodiments of the present invention, optionally, the cooking device 100 further includes: a guide plate 160 , which is disposed on the peripheral side of the cover body 130 , and is used to guide the airflow to flow toward the peripheral side of the cover body 130 .

[0173] In this embodiment, a guide plate 160 is provided on the peripheral side of the cover body 130. The guide plate 160 is arranged opposite to the air outlet. The extension direction of the cover body 130 is adapted to the flow direction of the airflow discharged from the air outlet, so that the airflow is guided by the guide plate 160, and the diffusion rate of the airflow to the surrounding of the cover body 130 is increased, thereby achieving the technical effect of improving the internal gas flow efficiency of the cooking device 100 and improving the heating rate of the cooking device 100.

[0174] It should be clarified that in the claims, specification and drawings of the present invention, the term "plurality" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of more conveniently describing the present invention and making the description process simpler, and is not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions cannot be understood as limitations on the present invention. The terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the specific circumstances of the above data.

[0175] In the claims, specification, and drawings of the present invention, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In the claims, specification, and drawings of the present invention, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0176] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fan blade, characterized in that: include: a plurality of blades, each blade comprising an inner end and an outer end, wherein the inner end is close to the axis of the fan blade and the outer end is away from the axis of the fan blade; The dimension of the inner end in the axial direction of the fan blade is a first height, and the dimension of the outer end in the axial direction of the fan blade is a second height; The second height is greater than the first height.

2. The fan blade according to claim 1, characterized in that In a direction from the inner end to the outer end, the height of at least part of the blades gradually increases.

3. The fan blade according to claim 1, characterized in that The outer end is provided with a chamfer, and the chamfer is a rounded corner.

4. A cooking device, characterized in that: include: The fan blade according to any one of claims 1 to 3; The main body includes a cooking cavity, and the fan blades are arranged on the main body, and the fan blades are used to blow air flow toward the cooking cavity through rotation.

5. The cooking device according to claim 4, characterized in that Also includes: The cover body is arranged on the outer side of the fan blade, and the cover body includes an air outlet. The air outlet is located on the peripheral side of the fan blade, and the size of the air outlet in the circumferential direction of the fan blade is larger than the size of the air outlet in the axial direction of the fan blade.

6. The cooking device according to claim 5, characterized in that The cover body includes an air outlet array, the air outlet array includes a plurality of air outlets, and the plurality of air outlets in the same air outlet array are evenly distributed in the circumferential direction of the fan blade; The number of the air outlet arrays is multiple; The plurality of air outlet arrays are distributed in the axial direction of the fan blade; The air outlets on two adjacent air outlet arrays are staggered in the tangential direction of the fan blades.

7. The cooking device according to any one of claims 4 to 6, characterized in that The fan blades have magnetic conductivity, and the cooking device includes an electromagnetic disk, which is arranged opposite to the fan blades.

8. The cooking device according to claim 5 or 6, characterized in that: The cover has magnetic conductivity, and the cooking device includes an electromagnetic disk, which is arranged opposite to the cover.

9. The cooking device according to claim 5 or 6, characterized in that: The cover body is rotatable.

10. The cooking device according to claim 5 or 6, characterized in that Also includes: A guide plate is provided on the peripheral side of the cover body, and is used to guide the airflow to flow toward the peripheral side of the cover body.

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