Air fryer and manufacturing method of circulating fan

Abstract

The invention relates to a manufacturing method of an air fryer and a circulating fan, the air fryer comprises a machine shell and a fan assembly, a cooking cavity is formed in the machine shell, the fan assembly is arranged in the machine shell, the fan assembly comprises a driving motor and a circulating fan, the circulating fan comprises a fixing part and a plurality of blades, and the blades are arranged on the fixing part. The multiple blades are arranged in the circumferential direction of the fixing part, the blades obliquely extend in the direction close to the cooking cavity in the direction from the radial inner side of the circulating fan to the radial outer side of the circulating fan, and each blade is provided with a first side deviating from the cooking cavity and a second side close to the cooking cavity. The included angle alpha between the plane where the fixing part is located and the first side is larger than or equal to 3 degrees and smaller than or equal to 12 degrees. According to the air fryer, by improving the structure of the circulating fan, the air supply amount can be increased, so that the circulating flowing efficiency of hot air in the cooking cavity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking appliances, and particularly to a manufacturing method of an air fryer and a circulation fan. Background Art

[0002] An air fryer heats the air in a cooking cavity through a heating structure, and then makes the high-temperature air circulate in the cooking cavity through a circulation fan, so that the food is dehydrated and the surface becomes golden and crispy, achieving the frying effect. In the related art, the structural design of the circulation fan is unreasonable, resulting in a low circulation efficiency of the hot air in the cooking cavity. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0004] To this end, the present invention provides an air fryer, which can increase the air delivery volume by improving the structure of the circulation fan to improve the circulation efficiency of the hot air in the cooking cavity.

[0005] The present invention also provides a manufacturing method of a circulation fan.

[0006] The air fryer of the present invention includes: a housing, a cooking cavity is provided in the housing; a fan assembly, the fan assembly is provided in the housing, the fan assembly includes a driving motor and a circulation fan, the circulation fan includes a fixing part and a plurality of blades, the plurality of blades are arranged along the circumferential direction of the fixing part, in the direction from the radial inner side to the radial outer side of the circulation fan, the blades extend obliquely towards the cooking cavity, the blades have a first side facing away from the cooking cavity and a second side close to the cooking cavity, and the included angle between the plane where the fixing part is located and the first side is α, where 3°≤α≤12°.

[0007] According to the air fryer of the present invention, since in the direction from the radial inner side to the radial outer side of the circulation fan, the blades extend obliquely towards the cooking cavity, and the first side of the blades satisfies the above included angle range with the fixing part, the air delivery volume towards the cooking cavity when the circulation fan rotates can be increased to promote the circulation and diffusion of heat in the cooking cavity. Therefore, the air fryer of the present invention can increase the air delivery volume by improving the structure of the circulation fan, which is beneficial to improving the circulation efficiency of the hot air in the cooking cavity, thereby improving the cooking efficiency of the air fryer.

[0008] Optionally, the included angle between the plane where the fixing part is located and the second side is β, where β>α. Thus, the inclination degree of the second side of the blade is greater than that of the first side of the blade to further increase the air delivery volume of the circulation fan, reduce the wind pressure loss, and improve the circulation effect of the hot air in the cooking cavity.

[0009] Optionally, the circulation fan further includes a main body plate disposed radially outside the fixing portion. The blade is disposed on a surface of the main body plate close to the cooking cavity, and the first side is connected to the fixing portion. An included angle between the plane where the fixing portion is located and the main body plate is γ, where γ = α. Thus, the inclination angle of the main body plate is consistent with the inclination angle of the first side of the blade. Since the blade is disposed on the surface of the main body plate close to the cooking cavity and the first side is connected to the fixing portion, the vibration amplitude during the rotation of the blade can be reduced, and the vibration reduction and noise reduction effects are better, and it is beneficial to improve the stability during the rotation of the circulation fan.

[0010] Optionally, the main body plate includes a skirt and support ribs. The skirt is disposed on the outer periphery of the circulation fan and is connected to a plurality of the blades. One end of the support rib is connected to the fixing portion, and the other end of the support rib is connected to the skirt. Thus, the skirt can be made to be generally annular and disposed on the outer periphery of the circulation fan. The radially outer ends of a plurality of blades are all connected to the skirt, thereby reducing the vibration amplitude during the rotation of the blades, improving the stability during the rotation of the circulation fan, and having better vibration reduction and noise reduction effects.

[0011] Optionally, a plurality of hollow holes are provided on the main body plate, and the plurality of hollow holes correspond to the plurality of blades one by one. The outer peripheral contour of the hollow hole is consistent with the outer peripheral contour of the blade. On the one hand, the hollow holes can promote the circulation of hot air on the upper and lower sides of the circulation fan to ensure the normal circulation and flow of hot air. On the other hand, since the outer peripheral contour of the hollow hole is consistent with the outer peripheral contour of the blade, the blade contour can be punched out on the main body plate and bent to form the blade, thus facilitating the processing and manufacturing of the circulation fan.

[0012] Optionally, the plate surface of the main body plate and the leaf surface of the blade are arranged perpendicular to each other. Thus, the turbulent flow effect during the rotation of the circulation fan can be improved, which is beneficial to increasing the air delivery volume of the circulation fan.

[0013] Optionally, the thicknesses of both the main body plate and the blade are M, where 0.4 mm ≤ M ≤ 0.8 mm. With the above parameter design for the thicknesses of the main body plate and the blade of the circulation fan of the present invention, the noise during the operation of the circulation fan can be reduced, the energy consumption of the driving motor can be decreased, and the production cost is relatively low.

[0014] Optionally, an infrared reflection layer is provided on the surface of the main body plate close to the cooking cavity and on the surface of the blade, so that heat can be circulated and reflected in the cooking cavity to improve the cooking effect of food.

[0015] Optionally, the circulation fan is located on the upper side of the cooking cavity, thereby promoting the circulation effect of hot air in the up and down directions. Alternatively, the circulation fan is located on one side in the horizontal direction of the cooking cavity, that is, the cooking cavity adopts the form of lateral air intake, which can reduce the probability of oil stains depositing on the circulation fan, and the oil stains deposited on the circulation fan will not fall down into the cooking cavity, and the use effect is better.

[0016] Optionally, the air fryer further includes a wind guide cover, the wind guide cover is arranged in the housing and located on the upper side of the cooking cavity, the circulation fan is arranged in the wind guide cover, the height of the circulation fan is H0, and the height of the wind guide cover is H1, wherein H0≤5H1 / 6. This can reduce the axial height of the circulation fan and have little impact on the air delivery volume when the circulation fan rotates.

[0017] Optionally, the air fryer further includes a wind guide cover, the wind guide cover is arranged in the housing and located on the upper side of the cooking cavity, the circulation fan is arranged in the wind guide cover, the inner diameter of the wind guide cover gradually increases in the direction from top to bottom, the inner diameter of the lower edge of the wind guide cover is W1, the inner diameter of the upper edge of the wind guide cover is W2, and the height of the wind guide cover is H1, wherein tan(α)=(W1 - W2) / H1. When the wind guide cover has a taper, the height of the wind guide cover, the inner diameter difference between the upper and lower edges of the wind guide cover, and the inclination angle α of the blade can satisfy the above relational expression, thereby further optimizing the structures of the wind guide cover and the circulation fan to improve the air flow field in the cooking cavity, that is, using the shape of the fan blade and the coupling mechanism between the inner cavity of the wind guide cover and the wind field to increase the circulation air delivery volume of the fan blade inside the air fryer.

[0018] Optionally, the inner diameter of the wind guide cover is constant in the direction from top to bottom, and 3°≤α≤7°. When the inner diameter of the upper edge of the wind guide cover is equal to the inner diameter of the lower edge of the wind guide cover, using the above parameter range for α can further increase the air delivery volume of the circulation fan, reduce the wind pressure loss, and improve the circulation effect of hot air in the cooking cavity.

[0019] Optionally, the arrangement quantity of the blades is negatively correlated with the value of H1. This can improve the cyclone circulation effect of hot air in the cooking cavity, so that the heat is concentrated as much as possible in the food placement area of the cooking cavity, and the oil removal effect on the food is more obvious, which is beneficial to improving the taste of food cooking.

[0020] Optionally, in the projection plane orthogonal to the axial direction of the circulation fan, the diameter of the inscribed circle of the outer peripheral contour of the cooking cavity is φ1, and the outer diameter of the circulation fan is φ2, where φ2 ≤ φ1, and the value of φ2 is positively correlated with the value of φ1. Since φ2 ≤ φ1, it is possible to avoid the problem of interference between the circulation fan and the inner walls of the air guide cover and the cooking cavity during installation, and since the value of φ2 is positively correlated with the value of φ1, the cross-sectional area of the hot air cyclone circulation flow field in the cooking cavity is relatively large, which is beneficial to improving the air supply volume of the air fryer, and the oil removal effect on food is more obvious, and the taste of food cooking is better.

[0021] The manufacturing method of the circulation fan of the present invention is applied to the circulation fan in any one of the air fryers of the present invention. The manufacturing method of the circulation fan includes the following steps:

[0022] S1: Cut out a fan mounting hole on the fixing part of the metal sheet, and cut out a plurality of blade profiles on the main body plate of the metal sheet body;

[0023] S2: Bend the main body plate into a conical shape, and the angle between the plane where the fixing part is located and the main body plate is α;

[0024] S3: Bend the sheet metal at the position of the blade profile to form blades, and the blades are located inside the conical surface of the main body plate.

[0025] According to the manufacturing method of the circulation fan of the present invention, by designing the circulation fan in the above manner, the air supply volume towards the cooking cavity when the circulation fan rotates can be increased to promote the circulation and diffusion of heat in the cooking cavity. Therefore, the manufacturing method of the circulation fan of the present invention can improve the structure of the circulation fan to increase the air supply volume, which is beneficial to improving the efficiency of the hot air circulating in the cooking cavity, thereby improving the cooking efficiency of the air fryer.

[0026] Optionally, the width of the blade profile gradually increases from the radially inner side to the radially outer side of the circulation fan. Thus, the inclination degree of the second side of the blade is larger than that of the first side of the blade, so as to further improve the air supply volume of the circulation fan, reduce the wind pressure loss, and improve the circulation effect of the hot air in the cooking cavity.

[0027] Optionally, there is a preset distance between the radially outer end of the blade and the outer peripheral edge of the main body plate. Thus, it is possible to form a skirt edge on the outer peripheral edge of the metal sheet after blanking, so as to improve the stability when the circulation fan rotates, and the vibration reduction and noise reduction effect is better.

[0028] Optionally, the bending radius at the connection position between the blade and the main body plate is r, where r ≥ 0.8 mm, and the plane of the main body plate is perpendicular to the plane of the blade. This can avoid the problem of fracture at the connection position between the blade and the main body plate due to stress concentration, which is beneficial to extending the service life of the circulation fan. In addition, the plane of the main body plate being perpendicular to the plane of the blade can improve the turbulent flow effect during the rotation of the circulation fan, which is beneficial to increasing the air delivery volume of the circulation fan. Brief Description of the Drawings

[0029] Figure 1 is a cross-sectional view of the air fryer according to an embodiment of the present invention.

[0030] Figure 2 is a schematic structural diagram of the air fryer according to an embodiment of the present invention.

[0031] Figure 3 is a side view of the circulation fan of the air fryer according to an embodiment of the present invention.

[0032] Figure 4 is a top view of the circulation fan of the air fryer according to an embodiment of the present invention.

[0033] Figure 5 is a side view of the blade of the circulation fan of the air fryer before bending according to an embodiment of the present invention.

[0034] Figure 6 is a schematic diagram of a single bent blade of the circulation fan of the air fryer according to an embodiment of the present invention.

[0035] Figure 7 is a cross-sectional view of the air fryer according to another embodiment of the present invention.

[0036] Reference Signs:

[0037] 1, housing; 11, cooking cavity;

[0038] 2, fan assembly; 21, drive motor; 211, output shaft; 22, circulation fan; 221, fixing part; 222, blade; 2221, first side; 2222, second side; 223, main body plate; 2231, skirt; 2232, support rib; 2233, hollow hole;

[0039] 3, air guide cover;

[0040] 4, heating element. Detailed Description of the Embodiments

[0041] The embodiments of the present invention will be described in detail below, and the examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] The following refers to the attached Figures 1 to 7 Describe the manufacturing method of the air fryer and the circulation fan according to the embodiments of the present invention.

[0043] As Figures 1 to 7 shown, the air fryer according to the embodiment of the present invention includes: a housing 1 and a blower assembly 2. A cooking cavity 11 is provided in the housing 1, the blower assembly 2 is provided in the housing 1, the blower assembly 2 includes a driving motor 21 and a circulation fan 22, the circulation fan 22 includes a fixing part 221 and a plurality of blades 222, the plurality of blades 222 are arranged along the circumferential direction of the fixing part 221, and in the direction from the radial inner side to the radial outer side of the circulation fan 22, the blades 222 extend obliquely towards the cooking cavity 11. The blade 222 has a first side 2221 facing away from the cooking cavity 11 and a second side 2222 close to the cooking cavity 11. The included angle between the plane where the fixing part 221 is located and the first side 2221 is α, where 3° ≤ α ≤ 12°.

[0044] It can be understood that the plane where the fixing part 221 is located is perpendicular to the axis of the output shaft 211 of the driving motor 21. The first side 2221 of the blade 222 is the side close to the driving motor 21 (such as Figure 1 the upper side of the blade 222 in Figure 1 ), and the second side 2222 of the blade 222 is the side close to the cooking cavity 11 (such as Figure 1 the lower side of the blade 222 in

[0045] For the air fryer according to the embodiment of the present invention, since in the direction from the radial inner side to the radial outer side of the circulation fan 22, the blades 222 extend obliquely towards the cooking cavity 11, and the first side 2221 of the blade 222 and the fixing part 221 satisfy the above included angle range, the air supply volume towards the cooking cavity 11 when the circulation fan 22 rotates can be increased, so as to promote the circulation and diffusion of heat in the cooking cavity 11 and reduce the wind pressure loss. Therefore, the air fryer according to the embodiment of the present invention can increase the air supply volume by improving the structure of the circulation fan 22, which is beneficial to improving the efficiency of the hot air circulating in the cooking cavity 11, thereby improving the cooking efficiency of the air fryer.

[0046] As Figure 1 and Figure 2 shown, when the circulation fan 22 is assembled into the housing 1, in order to ensure the first side 2221 of the blade 222 (such as Figure 1There is a certain air circulation space between the upper side of the middle blade 222 (the upper side of the middle blade 222) and the inner wall of the casing 1. It is necessary to space a certain distance between the first side 2221 of the blade 222 and the inner top wall of the casing 1. Since the blade 222 gradually inclines and extends towards the cooking cavity 11 in the direction from the inside to the outside, it can make the first side 2221 of the blade 222 reserve more sufficient space with the inner wall of the casing 1 to supply hot air to circulate in the cooking cavity 11, thereby increasing the air delivery volume of the circulation fan 22. And the air fryer of the embodiment of the present invention can, on the basis of ensuring a certain space between the first side 2221 of the blade 222 and the inner wall of the casing 1, shorten the installation dimension between the fixing part 221 and the inner wall of the casing 1, so that the output shaft 211 of the driving motor 21 can be designed shorter, thereby reducing the vibration of the output shaft 211 when the driving motor 21 works and reducing the noise when the fan assembly 2 rotates.

[0047] For example, as Figure 3 shown, the included angle α between the plane where the fixing part 221 is located and the first side 2221 can be 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°.

[0048] The inventor of the present application found through experimental research that when the included angle α between the plane where the fixing part 221 is located and the first side 2221 is less than 3°, the air delivery volume of the circulation fan 22 towards the cooking cavity 11 during rotation is small, and a relatively large distance needs to be spaced between the fixing part 221 and the inner wall of the casing 1 to ensure the air supply requirement of the cooking cavity 11. Furthermore, when the fan assembly 2 works, the output shaft 211 of the driving motor 21 and the circulation fan 22 will generate relatively large vibration noise.

[0049] When the included angle α between the plane where the fixing part 221 is located and the first side 2221 is greater than 12°, on the one hand, it will cause the circulation fan 22 to require a relatively large installation space, resulting in a relatively large height dimension of the whole machine. On the other hand, the air delivery wind field of the circulation fan 22 with the above structure is poor during rotation, reducing the food cooking efficiency.

[0050] In summary, for the air fryer of the embodiment of the present invention, by selecting the included angle α between the plane where the fixing part 221 is located and the first side 2221 to be between 3° and 12°, the air delivery volume can be increased, the wind pressure loss can be reduced, the circulation effect of hot air in the cooking cavity 11 can be improved, and it is beneficial to reduce the vibration noise of the output shaft 211 of the driving motor 21 and the circulation fan 22 during operation.

[0051] As Figure 1As shown, the air fryer further includes a heating element 4 disposed below the circulation fan 22. When the circulation fan 22 rotates, the circulation fan 22 can deliver the heat generated by the heating element 4 into the cooking cavity 11. Exemplarily, the heating element 4 can be a heating tube or a heating wire. In an example of the present invention, the heating element 4 is a disc-shaped heating tube.

[0052] Optionally, as Figure 3 shown, the angle between the plane where the fixing portion 221 is located and the second side 2222 is β, where β > α. It can be understood that the inclination degree of the second side 2222 of the blade 222 is greater than that of the first side 2221 of the blade 222. Thereby, the air delivery volume of the circulation fan 22 can be further increased, the wind pressure loss can be reduced, and the circulation effect of the hot air in the cooking cavity 11 can be improved.

[0053] Exemplarily, the angle β between the plane where the fixing portion 221 is located and the second side 2222 is less than 40°, so as to reduce the space required for installing the circulation fan 22, which is beneficial to reducing the height dimension of the air fryer, and can ensure that the circulation fan 22 has sufficient air delivery volume when rotating.

[0054] Optionally, as Figure 3 and Figure 4 shown, the circulation fan 22 further includes a main body plate 223 disposed radially outside the fixing portion 221. The blades 222 are disposed on the side of the main body plate 223 close to the cooking cavity 11, and the first side 2221 is connected to the fixing portion 221. The angle between the plane where the fixing portion 221 is located and the main body plate 223 is γ, where γ = α. It can be understood that the inclination angle of the main body plate 223 is the same as that of the first side 2221 of the blade 222, and the main body plate 223 is generally in a conical structure. Since the blades 222 are disposed on the side of the main body plate 223 close to the cooking cavity 11 and the first side 2221 is connected to the fixing portion 221, the vibration amplitude when the blades 222 rotate can be reduced, the vibration reduction and noise reduction effect is better, and it is beneficial to improve the stability when the circulation fan 22 rotates.

[0055] As Figure 4 and Figure 6 shown, the main body plate 223 includes a skirt 2231 and support ribs 2232. The skirt 2231 is disposed on the outer periphery of the circulation fan 22 and is connected to a plurality of blades 222. One end of the support rib 2232 is connected to the fixing portion 221, and the other end of the support rib 2232 is connected to the skirt 2231. It can be understood that there is a support rib 2232 between every two adjacent blades 222. The skirt 2231 is generally in a ring shape and is disposed on the outer periphery of the circulation fan 22. The radially outer ends of the plurality of blades 222 are all connected to the skirt 2231. Thereby, the vibration amplitude when the blades 222 rotate can be reduced, the stability when the circulation fan 22 rotates can be improved, and the vibration reduction and noise reduction effect is better.

[0056] Optionally, as Figure 3 and Figure 4 shown, a plurality of hollow holes 2233 are provided on the main body plate 223. The plurality of hollow holes 2233 correspond to the plurality of blades 222 one by one, and the outer peripheral contour of the hollow hole 2233 is the same as the outer peripheral contour of the blade 222. On the one hand, the hollow holes 2233 can promote the circulation of hot air on both the upper and lower sides of the circulation fan 22 to ensure the normal circulation of hot air. On the other hand, since the outer peripheral contour of the hollow hole 2233 is the same as the outer peripheral contour of the blade 222, the contour of the blade 222 can be punched out on the main body plate 223 and bent to form the blade 222, which is convenient for the processing and manufacturing of the circulation fan 22.

[0057] As Figure 6 shown, the plate surface of the main body plate 223 is vertically arranged with the blade surface of the blade 222, which can improve the turbulent flow effect when the circulation fan 22 rotates and is beneficial to increasing the air delivery volume of the circulation fan 22.

[0058] Optionally, as Figure 3 shown, the thicknesses of both the main body plate 223 and the blade 222 are M, where 0.4 mm ≤ M ≤ 0.8 mm. For example, M can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm. The inventor of the present application found through experimental research that when the thickness M of the main body plate 223 and the blade 222 is less than 0.4 mm, there is a problem of unstable structure when the circulation fan 22 rotates, and large vibration noise is easily generated. When the thickness M of the main body plate 223 and the blade 222 is greater than 0.4 mm, the energy consumption of the driving motor 21 is increased and the production cost is relatively high. Therefore, the thicknesses of the main body plate 223 and the blade 222 of the circulation fan 22 in the embodiments of the present invention are designed with the above parameters, which can not only reduce the noise when the circulation fan 22 works, but also reduce the energy consumption of the driving motor 21 and have a relatively low production cost.

[0059] Exemplarily, an infrared reflection layer is provided on the surface of the main body plate 223 close to the cooking cavity 11 and on the surface of the blade 222. This can enable the heat to be circulated and reflected in the cooking cavity 11 to improve the cooking effect of the food.

[0060] Optionally, as Figure 1 shown, the circulation fan 22 is located on the upper side of the cooking cavity 11, which can promote the circulation effect of hot air in the up and down directions. In other examples, as Figure 7 shown, the circulation fan 22 is located on one side in the horizontal direction of the cooking cavity 11, that is, the cooking cavity 11 adopts the form of side air intake, which can reduce the probability of oil stains depositing on the circulation fan 22, and the oil stains deposited on the circulation fan 22 will not fall down into the cooking cavity 11, and the use effect is better.

[0061] Optionally, as Figure 1 and Figure 2 shown, the air fryer further includes a wind guide cover 3. The wind guide cover 3 is disposed inside the housing 1 and is located above the cooking cavity 11. The circulation fan 22 is disposed inside the wind guide cover 3. The height of the circulation fan 22 is H0, and the height of the wind guide cover 3 is H1, where H0 ≤ 5H1 / 6. The inventors of the present application found through experimental research that when the height H0 of the circulation fan 22 and the height H1 of the wind guide cover 3 satisfy the above parameters, the axial height of the circulation fan 22 can be reduced, and the influence on the air delivery volume when the circulation fan 22 rotates is small. In order to further improve the air delivery volume of the circulation fan 22, the number of blades 222 can be appropriately increased. For example, the number of blades 222 can be increased to 36. The circulation fan 22 with the above height and the number of blades 222 enable the drive motor 21 to improve the internal air field circulation at a low rotation speed of 2000 rpm and enhance the circulation effect of hot air in the cooking cavity 11.

[0062] As Figure 2 shown, the inner diameter of the wind guide cover 3 gradually increases in the direction from top to bottom. The inner diameter of the lower edge of the wind guide cover 3 is W1, the inner diameter of the upper edge of the wind guide cover 3 is W2, and the height of the wind guide cover 3 is H1, where tan(α) = (W1 - W2) / H1. It can be understood that when the wind guide cover 3 has a taper, the height of the wind guide cover 3, the inner diameter difference between the upper and lower edges of the wind guide cover 3, and the inclination angle α of the blades 222 can satisfy the above relational expression, thereby further optimizing the structures of the wind guide cover 3 and the circulation fan 22 to improve the air flow field in the cooking cavity 11, that is, by utilizing the coupling mechanism between the shape of the fan blades and the inner cavity of the wind guide cover 3 and the wind field, the circulation air delivery volume of the fan blades inside the air fryer is increased.

[0063] In other examples, the inner diameter of the wind guide cover 3 is constant in the direction from top to bottom, and 3° ≤ α ≤ 7°. It can be understood that the outer peripheral contour of the wind guide cover is generally cylindrical, that is, the inner diameter of the upper edge of the wind guide cover 3 is equal to the inner diameter of the lower edge of the wind guide cover 3. At this time, the inclination angle α of the blades 222 can be selected among 3°, 4°, 5°, 6°, and 7°. Thereby, the air delivery volume of the circulation fan 22 can be further increased, the wind pressure loss can be reduced, and the circulation effect of hot air in the cooking cavity 11 can be improved.

[0064] Optionally, the arrangement quantity of the blades 222 is negatively correlated with the value of H1. It can be understood that when the height of H1 is higher, the number of blades 222 of the adapted circulation fan 22 is less, and when the height of H1 is lower, the number of blades 222 of the adapted circulation fan 22 is more. Thereby, the cyclone circulation effect of hot air in the cooking cavity 11 can be improved, so that the heat is concentrated as much as possible in the food placement area of the cooking cavity 11, and the oil removal effect on the food is more obvious, which is beneficial to improving the taste of food cooking.

[0065] Optionally, in the projection plane orthogonal to the axis of the circulation fan 22, the diameter of the inscribed circle of the outer peripheral contour of the cooking cavity 11 is φ1, and the outer diameter of the circulation fan 22 is φ2, where φ2 ≤ φ1, and the value of φ2 is positively correlated with the value of φ1. Since φ2 ≤ φ1, it is possible to avoid the problem of interference between the circulation fan 22 and the inner walls of the air guide cover 3 and the cooking cavity 11 during installation, and since the value of φ2 is positively correlated with the value of φ1, the cross-sectional area of the hot air cyclone circulation flow field in the cooking cavity 11 is relatively large, which is beneficial to increasing the air supply volume of the air fryer, and the oil removal effect on food is more obvious, and the taste of food cooking is better.

[0066] A manufacturing method of a circulation fan according to another embodiment of the present invention is applied to the circulation fan 22 of the air fryer in any one of the embodiments of the present invention. The manufacturing method of the circulation fan includes the following steps:

[0067] S1: Cut out a fan mounting hole on the fixing part 221 of the metal sheet, and cut out the outlines of a plurality of blades 222 on the main body plate 223 of the metal plate body;

[0068] S2: Bend the main body plate 223 into a conical shape, and the angle between the plane where the fixing part 221 is located and the main body plate 223 is α;

[0069] S3: Bend the sheet metal at the position of the blade 222 outline to form the blade 222, and the blade 222 is located inside the conical surface of the main body plate 223.

[0070] According to the manufacturing method of the circulation fan of the embodiment of the present invention, by designing the circulation fan 22 in the above manner, the air supply volume towards the cooking cavity 11 when the circulation fan 22 rotates can be increased, so as to promote the circulation and diffusion of heat in the cooking cavity 11. Therefore, the manufacturing method of the circulation fan of the embodiment of the present invention can improve the structure of the circulation fan 22 to increase the air supply volume, which is beneficial to improving the circulation efficiency of hot air in the cooking cavity 11, thereby improving the cooking efficiency of the air fryer. On the other hand, since when the circulation fan 22 is processed, the outlines of the blades 222 are punched out on the main body plate 223, and the sheet metal at the position of the blade 222 outline is bent to form the blade 222, it is convenient for the processing and manufacturing of the circulation fan 22 and reduces the production cost.

[0071] Optionally, the width of the blade 222 outline gradually increases from the radially inner side to the radially outer side of the circulation fan 22. Thus, the inclination degree of the second side 2222 of the blade 222 is larger than that of the first side 2221 of the blade 222, so as to further increase the air supply volume of the circulation fan 22, reduce the wind pressure loss, and improve the circulation effect of hot air in the cooking cavity 11.

[0072] Such asFigure 4 As shown, there is a preset distance between the radially outer end of the blade 222 and the outer periphery of the main body plate 223. Thus, a skirt 2231 can be formed at the outer periphery of the blanked metal sheet, which can improve the stability when the circulation fan 22 rotates, and has a good vibration reduction and noise reduction effect.

[0073] Optionally, the bending radius at the connection position between the blade 222 and the main body plate 223 is r, where r≥0.8 mm. Thus, the problem that the connection position between the blade 222 and the main body plate 223 breaks due to stress concentration can be avoided, which is beneficial to extending the service life of the circulation fan 22. In addition, the plate surface of the main body plate 223 is arranged perpendicular to the blade surface of the blade 222, which can improve the turbulent flow effect when the circulation fan 22 rotates and is beneficial to increasing the air delivery volume of the circulation fan 22.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0075] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0076] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the present invention, unless otherwise clearly defined or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact via an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0078] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0079] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and alterations made by those of ordinary skill in the art to the above embodiments are all within the scope of protection of the present invention.

Claims

1. An air fryer, characterized in that: include: A casing (1), wherein a cooking cavity (11) is provided in the casing (1); A fan assembly (2), wherein the fan assembly (2) is arranged in the housing (1), the fan assembly (2) comprises a driving motor (21) and a circulation fan (22), the circulation fan (22) comprises a fixing portion (221) and a plurality of blades (222), the plurality of blades (222) being arranged along the circumference of the fixing portion (221), and in a direction from the radial inner side of the circulation fan (22) to the radial outer side of the circulation fan (22), the blades (222) extend obliquely in a direction close to the cooking cavity (11), the blades (222) have a first side (2221) facing away from the cooking cavity (11) and a second side (2222) close to the cooking cavity (11), and an angle α between a plane where the fixing portion (221) is located and the first side (2221), wherein 3°≤α≤12°.

2. The air fryer according to claim 1, characterized in that: The angle between the plane where the fixing portion (221) is located and the second side (2222) is β, wherein β>α.

3. The air fryer according to claim 1, characterized in that: The circulation fan (22) further comprises a main body plate (223), wherein the main body plate (223) is arranged on the radially outer side of the fixing portion (221), the blades (222) are arranged on a side of the main body plate (223) close to the cooking cavity (11), and the first side (2221) is connected to the fixing portion (221), and the angle between the plane where the fixing portion (221) is located and the main body plate (223) is γ, wherein γ=α.

4. The air fryer according to claim 3, characterized in that: The main body plate (223) comprises a skirt (2231) and a supporting rib (2232); the skirt (2231) is arranged on the outer periphery of the circulation fan (22) and is connected to the plurality of blades (222); one end of the supporting rib (2232) is connected to the fixing portion (221), and the other end of the supporting rib (2232) is connected to the skirt (2231).

5. The air fryer according to claim 3, characterized in that: The main body plate (223) is provided with a plurality of hollow holes (2233), the plurality of hollow holes (2233) correspond one-to-one to the plurality of blades (222), and the outer peripheral contour of the hollow holes (2233) is consistent with the outer peripheral contour of the blades (222).

6. The air fryer according to claim 3, characterized in that: The plate surface of the main plate (223) is arranged perpendicularly to the blade surface of the blade (222); And / or, the thickness of the main plate (223) and the blade (222) are both M, wherein 0.4 mm ≤ M ≤ 0.8 mm.

7. The air fryer according to claim 3, characterized in that: A surface of the main body plate (223) close to the cooking cavity (11) and a surface of the blade (222) are both provided with an infrared reflection layer.

8. The air fryer according to any one of claims 1 to 7, characterized in that: The circulation fan (22) is located on the upper side of the cooking cavity (11), or the circulation fan (22) is located on one side of the cooking cavity (11) in the horizontal direction.

9. The air fryer according to any one of claims 1 to 7, characterized in that: The air fryer further comprises an air guide cover (3), wherein the air guide cover (3) is arranged in the housing (1) and is located on the upper side of the cooking cavity (11), the circulation fan (22) is arranged in the air guide cover (3), the height of the circulation fan (22) is H0, and the height of the air guide cover (3) is H1, wherein H0≤5H1 / 6.

10. The air fryer according to any one of claims 1 to 7, characterized in that: The air fryer further comprises an air guide cover (3), wherein the air guide cover (3) is arranged in the housing (1) and is located on the upper side of the cooking cavity (11), the circulating fan (22) is arranged in the air guide cover (3), the inner diameter of the air guide cover (3) gradually increases from top to bottom, the inner diameter of the lower edge of the air guide cover (3) is W1, the inner diameter of the upper edge of the air guide cover (3) is W2, and the height of the air guide cover (3) is H1, wherein tan(α)=(W1-W2) / H1; Alternatively, the inner diameter of the air guide cover (3) is constant in a direction from top to bottom, and is 3°≤α≤7°.

11. The air fryer according to claim 10, characterized in that: The number of blades (222) arranged is negatively correlated with the value of H1.

12. The air fryer according to any one of claims 1 to 7, characterized in that: In a projection plane orthogonal to the axial direction of the circulation fan (22), the diameter of the inscribed circle of the outer peripheral contour of the cooking cavity (11) is φ1, and the outer diameter of the circulation fan (22) is φ2, wherein φ2≤φ1, and the value of φ2 is positively correlated with the value of φ1.

13. A method for manufacturing a circulating fan, characterized in that: The circulating fan (22) used in the air fryer according to any one of claims 1 to 12, wherein the manufacturing method of the circulating fan comprises the following steps: S1: cutting a fan mounting hole on a fixing portion (221) of a metal plate, and cutting a plurality of blade (222) contours on a main body plate (223) of the metal plate; S2: bending the main body plate (223) into a cone shape, and the angle between the plane where the fixing portion (221) is located and the main body plate (223) is α; S3: bending the sheet metal at the contour position of the blade (222) to form the blade (222), and the blade (222) is located on the inner side of the conical surface of the main body plate (223).

14. The method for manufacturing a circulating fan according to claim 13, characterized in that: The width of the blade (222) profile gradually increases from the radial inner side of the circulation fan (22) to the radial outer side of the circulation fan (22); And / or, the radial outer end of the blade (222) has a preset distance from the outer peripheral edge of the main body plate (223); And / or, the bending radius of the connection position between the blade (222) and the main plate (223) is r, wherein r≥0.8 mm, and the plate surface of the main plate (223) is arranged perpendicular to the blade surface of the blade (222).

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