Air fryer

Abstract

The utility model relates to an air fryer which 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, the structure of the circulating fan is improved, so that the air supply amount can be increased, and the circulating flowing efficiency of hot air in the cooking cavity is improved.

Description

Technical Field

[0001] This utility model relates to the field of cooking appliance technology, specifically to an air fryer. Background Technology

[0002] Air fryers heat the air inside the cooking chamber using a heating element, and then a circulating fan circulates this hot air throughout the chamber, dehydrating the food and causing it to become golden brown and crispy, achieving a frying effect. However, in some technologies, the circulating fan design is flawed, resulting in low efficiency in the circulation of hot air within the cooking chamber. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, this utility model proposes an air fryer that improves the structure of the circulating fan to increase the air volume and improve the efficiency of hot air circulation in the cooking cavity.

[0005] This utility model also proposes a method for manufacturing a circulating fan.

[0006] The air fryer of this utility model includes: a housing, wherein a cooking cavity is provided inside the housing; and a fan assembly, wherein the fan assembly is disposed inside the housing, the fan assembly including a drive motor and a circulating fan, the circulating fan including a fixed part and a plurality of blades, the plurality of blades being arranged circumferentially along the fixed part, and the blades extending obliquely toward the cooking cavity in a direction from the radial inner side to the radial outer side of the circulating fan, the blades having a first side away from the cooking cavity and a second side toward the cooking cavity, the angle between the plane where the fixed part is located and the first side being α, wherein 3°≤α≤12°.

[0007] According to the present invention, the air fryer has blades that extend at an angle towards the cooking cavity in the direction from the radially inner side to the radially outer side of the circulating fan, and the first side of the blades and the fixing part satisfy the aforementioned angle range. This increases the airflow towards the cooking cavity when the circulating fan rotates, thereby promoting the circulation and diffusion of heat within the cooking cavity. Therefore, by improving the structure of the circulating fan, the air fryer of the present invention can increase the airflow, which is beneficial to improving the efficiency of hot air circulation within the cooking cavity, thus enhancing the cooking efficiency of the air fryer.

[0008] Optionally, the angle between the plane containing the fixing part and the second side is β, where β > α. Therefore, the inclination of the second side of the blade is greater than that of the first side of the blade, further increasing the airflow of the circulating fan, reducing air pressure loss, and improving the circulation of hot air within the cooking cavity.

[0009] Optionally, the circulating fan further includes a main body plate, which is located radially outside the fixed part. The blades are located on the side of the main body plate near the cooking cavity, and the first side is connected to the fixed part. The plane containing the fixed part and the main body plate form an angle γ, where γ = α. Thus, the tilt angle of the main body plate is consistent with the tilt angle of the first side of the blades. Since the blades are located on the side of the main body plate near the cooking cavity and the first side is connected to the fixed part, the vibration amplitude during blade rotation can be reduced, resulting in better vibration reduction and noise reduction, and also improving the stability of the circulating fan during rotation.

[0010] Optionally, the main body plate includes a skirt and supporting ribs. The skirt is located on the outer periphery of the circulating fan and connected to multiple blades. One end of the supporting rib is connected to the fixing part, and the other end of the supporting rib is connected to the skirt. This allows the skirt to be generally annular and located on the outer periphery of the circulating fan. The radially outer ends of multiple blades are all connected to the skirt, thereby reducing the vibration amplitude when the blades rotate, improving the stability of the circulating fan during rotation, and achieving better vibration reduction and noise reduction effects.

[0011] Optionally, the main body plate is provided with multiple perforated holes, each corresponding to one of the blades, and the outer periphery of the perforated holes is consistent with the outer periphery of the blades. On the one hand, the perforated holes can promote the circulation of hot air on both sides of the circulating fan to ensure normal circulation of hot air. On the other hand, since the perforated holes are consistent with the outer periphery of the blades, the blade outline can be punched out on the main body plate and bent to form the blades, thereby facilitating the processing and manufacturing of the circulating fan.

[0012] Optionally, the surface of the main plate is arranged perpendicular to the surface of the blades. This can improve the turbulence effect when the circulating fan rotates, which is beneficial to increasing the air volume delivered by the circulating fan.

[0013] Optionally, the thickness of both the main body plate and the blades is M, where 0.4mm ≤ M ≤ 0.8mm. The thickness of the main body plate and blades of the circulating fan of this invention is designed using the above parameters, which can reduce the noise of the circulating fan during operation, reduce the energy consumption of the drive motor, and lower the production cost.

[0014] Optionally, the side of the main plate near the cooking cavity and the surface of the blades are provided with an infrared reflective layer so that heat is circulated and reflected within the cooking cavity to improve the cooking effect of the food.

[0015] Optionally, the circulating fan is located on the upper side of the cooking cavity, thereby promoting the circulation of hot air in the vertical direction. Alternatively, the circulating fan is located on the horizontal side of the cooking cavity, that is, the cooking cavity adopts a side-entry airflow form, which can reduce the probability of oil stains depositing on the circulating fan, and the oil stains deposited on the circulating fan will not fall downward into the cooking cavity, resulting in better performance.

[0016] Optionally, the air fryer further includes an air guide shroud, which is disposed inside the housing and located above the cooking cavity. A circulating fan is disposed inside the air guide shroud, the height of the circulating fan being H0, and the height of the air guide shroud being H1, wherein H0 ≤ 5H1 / 6. This reduces the axial height of the circulating fan and has a smaller impact on the airflow volume when the circulating fan rotates.

[0017] Optionally, the air fryer further includes an air guide shroud, which is disposed inside the housing and located on the upper side of the cooking cavity. The circulating fan is disposed inside the air guide shroud. The inner diameter of the air guide shroud gradually increases from top to bottom. The inner diameter of the lower edge of the air guide shroud is W1, the inner diameter of the upper edge of the air guide shroud is W2, and the height of the air guide shroud is H1, where tan(α) = (W1-W2) / H1. When the air guide shroud has a taper, the height of the air guide shroud, the difference in inner diameter between the upper and lower edges of the air guide shroud, and the blade tilt angle α can satisfy the above relationship. This allows for further optimization of the structure of the air guide shroud and the circulating fan to improve the airflow field within the cooking cavity. Specifically, by utilizing the shape of the fan blades and the coupling mechanism between the inner cavity of the air guide shroud and the airflow field, the circulating air volume of the fan blades inside the air fryer can be increased.

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

[0019] Optionally, the number of blades is negatively correlated with the value of H1. This can improve the effect of hot air cyclone circulation within the cooking cavity, so that 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 the cooked food.

[0020] Optionally, in a projection plane orthogonal to the axis of the circulating fan, the diameter of the inscribed circle of the outer periphery of the cooking cavity is φ1, and the outer diameter of the circulating fan is φ2, where φ2 ≤ φ1, and the value of φ2 is positively correlated with the value of φ1. Since φ2 ≤ φ1, interference between the circulating fan and the inner wall of the air guide shroud and the inner wall of the cooking cavity during installation can be avoided. Furthermore, because the value of φ2 is positively correlated with the value of φ1, the cross-sectional area of ​​the hot air cyclone circulation flow field within the cooking cavity is larger, which is beneficial for increasing the air volume of the air fryer, resulting in a more significant oil removal effect on food and a better taste.

[0021] The method for manufacturing the circulating fan of this utility model, applied to the circulating fan in the air fryer according to any one of this utility model, includes the following steps:

[0022] S1: Cut fan mounting holes on the fixing part of the metal plate, and cut multiple blade outlines on the main body of the metal plate.

[0023] S2: The main body plate is bent into a cone 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 blade outline position to form a blade, and the blade is located inside the conical surface of the main body plate.

[0025] According to the manufacturing method of the circulating fan of this utility model, by designing the circulating fan in the above manner, the air volume delivered towards the cooking cavity when the circulating fan rotates can be increased, thereby promoting the circulation and diffusion of heat within the cooking cavity. Therefore, the manufacturing method of the circulating fan of this utility model can improve the structure of the circulating fan to increase the air volume, which is beneficial to improving the efficiency of hot air circulation within the cooking cavity, thus enhancing 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 circulating fan. This results in a greater inclination on the second side of the blade than on the first side, further increasing the airflow of the circulating fan, reducing pressure loss, and improving the circulation of hot air within the cooking chamber.

[0027] Optionally, the radial outer end of the blade is at a predetermined distance from the outer periphery of the main body plate. This allows the stamped metal sheet to form a skirt along its outer periphery, improving the stability of the circulating fan during rotation and providing better vibration reduction and noise reduction.

[0028] Optionally, the bending radius at the connection point between the blade and the main body plate is r, where r ≥ 0.8 mm, and the surface of the main body plate is perpendicular to the blade surface. This avoids breakage due to stress concentration at the connection point between the blade and the main body plate, thus extending the service life of the circulating fan. Furthermore, the perpendicular arrangement of the main body plate surface to the blade surface improves the turbulence effect during fan rotation, thereby increasing the airflow of the circulating fan. Attached Figure Description

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

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

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

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

[0033] Figure 5 This is a side view of the air fryer's circulating fan blades before bending, according to an embodiment of this utility model.

[0034] Figure 6 This is a schematic diagram of a single blade of the circulating fan of the air fryer according to an embodiment of the present invention after bending.

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

[0036] Figure label:

[0037] 1. Housing; 11. Cooking cavity;

[0038] 2. Fan assembly; 21. Drive motor; 211. Output shaft; 22. Circulating fan; 221. Fixing part; 222. Blade; 2221. First side; 2222. Second side; 223. Main plate; 2231. Skirt; 2232. Support rib; 2233. Hole;

[0039] 3. Air guide cover;

[0040] 4. Heating element. Detailed Implementation

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

[0042] The following is a reference appendix. Figures 1 to 7 This invention describes an air fryer according to an embodiment of the present invention.

[0043] like Figures 1 to 7 As shown, the air fryer of this utility model embodiment includes: a housing 1 and a fan assembly 2. The housing 1 has a cooking chamber 11 inside, and the fan assembly 2 is disposed inside the housing 1. The fan assembly 2 includes a drive motor 21 and a circulating fan 22. The circulating fan 22 includes a fixing part 221 and multiple blades 222. The multiple blades 222 are arranged circumferentially along the fixing part 221. In the direction from the radial inner side to the radial outer side of the circulating fan 22, the blades 222 extend obliquely towards the cooking chamber 11. The blades 222 have a first side 2221 away from the cooking chamber 11 and a second side 2222 close to the cooking chamber 11. The angle between the plane where the fixing part 221 is located and the first side 2221 is α, where 3°≤α≤12°.

[0044] It is understandable that the plane containing the fixing part 221 is perpendicular to the axis of the output shaft 211 of the drive motor 21, and the first side 2221 of the blade 222 is the side closer to the drive motor 21 (e.g., Figure 1 The upper side of the middle blade 222), the second side 2222 of the blade 222 is the side closer to the cooking cavity 11 (e.g., the ...). Figure 1 (Lower side of the middle blade 222).

[0045] According to the embodiment of the present invention, the air fryer has blades 222 extending obliquely towards the cooking chamber 11 in the direction from the radially inner side to the radially outer side of the circulating fan 22, and the first side 2221 of the blades 222 and the fixing part 221 satisfy the aforementioned angle range. This increases the airflow towards the cooking chamber 11 when the circulating fan 22 rotates, thereby promoting heat circulation and diffusion within the cooking chamber 11 and reducing air pressure loss. Therefore, by improving the structure of the circulating fan 22, the air fryer of the embodiment of the present invention can increase the airflow, which is beneficial to improving the efficiency of hot air circulation within the cooking chamber 11, thereby enhancing the cooking efficiency of the air fryer.

[0046] like Figure 1 and Figure 2 As shown, when the circulating fan 22 is assembled into the housing 1, in order to ensure that the first side 2221 of the blade 222 (as shown) Figure 1There is a certain air circulation space between the upper side of the blade 222 and the inner wall of the housing 1, requiring a certain space to be separated between the first side 2221 of the blade 222 and the inner top wall of the housing 1. Since the blade 222 gradually extends towards the cooking cavity 11 from the inside out, more space can be reserved between the first side 2221 of the blade 222 and the inner wall of the housing 1 to allow hot air to circulate in the cooking cavity 11, thereby increasing the air volume delivered by the circulating fan 22. The air fryer of this embodiment can shorten the installation dimensions of the fixing part 221 and the inner wall of the housing 1 while ensuring that a certain space is maintained between the first side 2221 of the blade 222 and the inner wall of the housing 1, so that the output shaft 211 of the drive motor 21 can be designed to be shorter, thereby reducing the vibration of the output shaft 211 when the drive motor 21 is working, and reducing the noise when the fan assembly 2 rotates.

[0047] For example, such as Figure 3 As shown, the 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°, or 12°.

[0048] The inventors of this application discovered through experimental research that when the angle α between the plane where the fixing part 221 is located and the first side 2221 is less than 3°, the air volume delivered to the cooking cavity 11 when the circulating fan 22 rotates is small, and a large distance needs to be separated between the fixing part 221 and the inner wall of the housing 1 to ensure the air delivery requirements of the cooking cavity 11. Consequently, when the fan assembly 2 is working, the output shaft 211 of the drive motor 21 and the circulating fan 22 will generate large vibration noise.

[0049] When the 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, the installation space required for the circulating fan 22 will be larger, resulting in a larger overall height. On the other hand, the airflow field of the circulating fan 22 with the above structure is poor when it rotates, which reduces the efficiency of food cooking.

[0050] In summary, the air fryer of this utility model, by selecting the included angle α between the plane where the fixing part 221 is located and the first side 2221 between 3° and 12°, can increase the air volume, reduce the wind pressure loss, improve the circulation effect of hot air in the cooking cavity 11, and help reduce the vibration noise of the output shaft 211 of the drive motor 21 and the circulating fan 22 during operation.

[0051] like Figure 1As shown, the air fryer also includes a heating element 4, which is located below the circulating fan 22. When the circulating fan 22 rotates, it can transfer 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 this example of the present invention, the heating element 4 is a disc-shaped heating tube.

[0052] Optionally, such as Figure 3 As shown, the angle between the plane containing the fixing part 221 and the second side 2222 is β, where β > α. It can be understood that the inclination of the second side 2222 of the blade 222 is greater than the inclination of the first side 2221 of the blade 222. This further increases the airflow of the circulating fan 22, reduces air pressure loss, and improves the circulation of hot air within the cooking chamber 11.

[0053] For example, the angle β between the plane where the fixing part 221 is located and the second side 2222 is less than 40°, so as to reduce the space required for the installation of the circulating fan 22, which is beneficial to reduce the height of the air fryer and can ensure that the circulating fan 22 has sufficient air volume when it rotates.

[0054] Optionally, such as Figure 3 and Figure 4 As shown, the circulating fan 22 also includes a main body plate 223, which is located radially outside the fixing part 221. Blades 222 are located on the side of the main body plate 223 near the cooking cavity 11, and the first side 2221 is connected to the fixing part 221. The plane containing the fixing part 221 and the main body plate 223 form an angle γ, where γ = α. It can be understood that the tilt angle of the main body plate 223 is consistent with the tilt angle of the first side 2221 of the blades 222. The main body plate 223 is generally conical in shape. Since the blades 222 are located on the side of the main body plate 223 near the cooking cavity 11, and the first side 2221 is connected to the fixing part 221, the vibration amplitude of the blades 222 during rotation can be reduced, resulting in better vibration reduction and noise reduction, and also improving the stability of the circulating fan 22 during rotation.

[0055] like Figure 4 and Figure 6 As shown, the main body plate 223 includes a skirt 2231 and a support rib 2232. The skirt 2231 is located on the outer periphery of the circulating fan 22 and is connected to multiple blades 222. One end of the support rib 2232 is connected to the fixing part 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 annular and located on the outer periphery of the circulating fan 22. The radial outer ends of multiple blades 222 are all connected to the skirt 2231. This can reduce the vibration amplitude when the blades 222 rotate, improve the stability of the circulating fan 22 when rotating, and achieve a good vibration reduction and noise reduction effect.

[0056] Optionally, such as Figure 3 and Figure 4 As shown, the main body plate 223 has multiple perforated holes 2233, each corresponding to a different blade 222. The outer contour of the perforated hole 2233 matches the outer contour of the blade 222. On one hand, the perforated holes 2233 promote the circulation of hot air on both the upper and lower sides of the circulating fan 22, ensuring normal airflow. On the other hand, since the perforated holes 2233 match the outer contour of the blades 222, the blade 222 contour can be punched out on the main body plate 223 and bent to form the blades 222, thus facilitating the manufacturing of the circulating fan 22.

[0057] like Figure 6 As shown, the surface of the main plate 223 is arranged perpendicular to the surface of the blade 222, which can improve the turbulence effect when the circulating fan 22 rotates and help increase the air volume of the circulating fan 22.

[0058] Optionally, such as Figure 3 As shown, the thickness of both the main plate 223 and the blades 222 is M, where 0.4mm ≤ M ≤ 0.8mm. For example, M can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm. The inventors of this application discovered through experimental research that when the thickness M of the main plate 223 and the blades 222 is less than 0.4mm, the circulating fan 22 exhibits structural instability during rotation, easily generating significant vibration and noise. When the thickness M of the main plate 223 and the blades 222 is greater than 0.4mm, it increases the energy consumption of the drive motor 21 and raises production costs. Therefore, the circulating fan 22 of this embodiment uses the above-mentioned parameters to design the thickness of the main plate 223 and the blades 222, which reduces the noise of the circulating fan 22 during operation, decreases the energy consumption of the drive motor 21, and lowers production costs.

[0059] For example, the side of the main body plate 223 near the cooking cavity 11 and the surface of the blade 222 are both provided with infrared reflective layers. This allows heat to circulate and reflect within the cooking cavity 11, thereby improving the cooking effect of the food.

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

[0061] Optionally, such as Figure 1 and Figure 2 As shown, the air fryer also includes an air guide shroud 3, which is located inside the housing 1 and above the cooking chamber 11. A circulating fan 22 is located inside the air guide shroud 3. The height of the circulating fan 22 is H0, and the height of the air guide shroud 3 is H1, where H0 ≤ 5H1 / 6. The inventors of this application discovered through experimental research that when the height H0 of the circulating fan 22 and the height H1 of the air guide shroud 3 meet the above parameters, the axial height of the circulating fan 22 can be reduced, with minimal impact on the airflow during the rotation of the circulating fan 22. To further improve the airflow of the circulating fan 22, the number of blades 222 can be appropriately increased; for example, the number of blades 222 can be increased to 36. The aforementioned height of the circulating fan 22 and the number of blades 222 enable the drive motor 21 to improve the airflow circulation at a low speed of 2000 rpm, thereby enhancing the circulation effect of hot air within the cooking chamber 11.

[0062] like Figure 2 As shown, the inner diameter of the air guide shroud 3 gradually increases from top to bottom. The inner diameter of the lower edge of the air guide shroud 3 is W1, the inner diameter of the upper edge of the air guide shroud 3 is W2, and the height of the air guide shroud 3 is H1, where tan(α)=(W1-W2) / H1. It can be understood that when the air guide shroud 3 has a taper, the height of the air guide shroud 3, the difference in inner diameter between the upper and lower edges of the air guide shroud 3, and the tilt angle α of the blades 222 can satisfy the above relationship. Therefore, the structure of the air guide shroud 3 and the circulating fan 22 can be further optimized to improve the airflow field in the cooking cavity 11. That is, by utilizing the shape of the fan blades and the coupling mechanism between the inner cavity of the air guide shroud 3 and the air field, the circulating air volume of the fan blades inside the air fryer can be increased.

[0063] In other examples, the inner diameter of the air guide shroud 3 is constant from top to bottom, 3°≤α≤7°. It can be understood that the outer periphery of the air guide shroud is roughly cylindrical, meaning the inner diameter of the upper edge of the air guide shroud 3 is equal to the inner diameter of the lower edge. In this case, the tilt angle α of the blades 222 can be selected between 3°, 4°, 5°, 6°, and 7°. This further increases the airflow of the circulating fan 22, reduces air pressure loss, and improves the circulation of hot air within the cooking cavity 11.

[0064] Optionally, the number of blades 222 is negatively correlated with the value of H1. It can be understood that the higher the height of H1, the fewer blades 222 of the adapted circulating fan 22 are required; conversely, the lower the height of H1, the more blades 222 of the adapted circulating fan 22 are required. This improves the hot air cyclone circulation effect within the cooking cavity 11, concentrating heat as much as possible in the food placement area of ​​the cooking cavity 11, and resulting in a more significant oil removal effect on the food, thus improving the taste of the cooked food.

[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 larger, 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 portion 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 included angle between the plane where the fixing portion 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. [[ID=I5]]

[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 efficiency of the hot air circulating in the cooking cavity 11, thereby enhancing 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, it is convenient for the processing and manufacturing of the circulation fan 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 the hot air in the cooking cavity 11.

[0072] As shown Figure 4 in Figure 4 , there is a preset distance between the radially outer end of the blade 222 and the outer peripheral edge of the main body plate 223. Thus, a skirt 2231 can be formed on the outer peripheral edge of the blanked metal sheet, so as to improve the stability when the circulation fan 22 rotates, and the vibration reduction and noise reduction effects are better.

[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 plane of the main body plate 223 and the blade surface of the blade 222 are arranged perpendicular to each other, 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. It is 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 thus cannot be understood as a limitation to the present invention.

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

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

[0077] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions 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 one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

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

Claims

1. An air fryer, characterized in that, include: The housing (1) has a cooking cavity (11) inside; A fan assembly (2) is disposed inside the housing (1). The fan assembly (2) includes a drive motor (21) and a circulating fan (22). The circulating fan (22) includes a fixed part (221) and a plurality of blades (222). The plurality of blades (222) are arranged circumferentially along the fixed part (221). In the direction from the radial inner side to the radial outer side of the circulating fan (22), the blades (222) extend obliquely toward the cooking cavity (11). The blades (222) have a first side (2221) away from the cooking cavity (11) and a second side (2222) close to the cooking cavity (11). The angle between the plane where the fixed part (221) is located and the first side (2221) is α, wherein 3°≤α≤12°.

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

3. The air fryer according to claim 1, characterized in that, The circulating fan (22) also includes a main body plate (223), which is located on the radial outer side of the fixing part (221). The blades (222) are located on the side of the main body plate (223) near the cooking cavity (11), and the first side (2221) is connected to the fixing part (221). The plane where the fixing part (221) is located and the main body plate (223) form an angle γ, where γ = α.

4. The air fryer according to claim 3, characterized in that, The main body plate (223) includes a skirt (2231) and a support rib (2232). The skirt (2231) is located on the outer periphery of the circulating fan (22) and is connected to a plurality of blades (222). One end of the support rib (2232) is connected to the fixing part (221), and the other end of the support rib (2232) is connected to the skirt (2231).

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

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

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

8. The air fryer according to any one of claims 1-7, characterized in that, The circulating fan (22) is located on the upper side of the cooking cavity (11), or the circulating 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 1-7, characterized in that, The air fryer also includes an air guide hood (3), which is located inside the housing (1) and above the cooking cavity (11). The circulating fan (22) is located inside the air guide hood (3). The height of the circulating fan (22) is H0, and the height of the air guide hood (3) is H1, wherein H0≤5H1 / 6.

10. The air fryer according to any one of claims 1-7, characterized in that, The air fryer also includes an air guide hood (3), which is located inside the housing (1) and on the upper side of the cooking cavity (11). The circulating fan (22) is located inside the air guide hood (3). The inner diameter of the air guide hood (3) gradually increases from top to bottom. The inner diameter of the lower edge of the air guide hood (3) is W1, the inner diameter of the upper edge of the air guide hood (3) is W2, and the height of the air guide hood (3) is H1. Wherein, tan(α)=(W1-W2) / H1; Alternatively, the inner diameter of the air guide shroud (3) is constant along the top-to-bottom direction, 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 1-7, characterized in that, In the projection plane orthogonal to the axis of the circulating fan (22), the diameter of the inscribed circle of the outer periphery of the cooking cavity (11) is φ1, and the outer diameter of the circulating fan (22) is φ2, wherein φ2≤φ1, and the value of φ2 is positively correlated with the value of φ1.

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