Fan blade and cooking utensil

Abstract

The utility model discloses a fan blade and a cooking utensil. The fan blade comprises a shaft connecting part and a fan blade, the blade body is connected to the radial outer side of the shaft connecting part, the blade body is provided with a first side face and a second side face, and the first side face and the second side face are oppositely arranged; the air pushing part is arranged on the first side face, and an air pushing channel is defined between the air pushing part and the blade body; wherein the fan blade is provided with a preset plane, the preset plane is perpendicular to a center shaft of the fan blade, at least part of the shaft connecting part is located on the preset plane, and the distance between the preset plane and the first side face is gradually increased in the direction away from the center shaft. According to the embodiment of the utility model, the first side surface is constructed into the first arc-shaped surface, and the structural characteristics of the first arc-shaped surface are utilized, so that air flow smoothly flows on the surface of the fan blade, the fan blade plays a guiding role, the turbulent flow characteristic is reduced, and vibration and resonance are avoided, thereby reducing impact noise, improving the energy utilization rate and improving the overall performance.

Description

Technical Field

[0001] This utility model relates to the field of cooking appliances, and in particular to a fan blade and a cooking utensil. Background Technology

[0002] In electrical equipment, fan blades are a key component, widely used in air fryers, fans, air conditioners, and other devices. However, the direct collision between the airflow from the fan blade's outlet and the surrounding enclosure often results in strong airflow impacts. These impacts not only cause significant loss of airflow kinetic energy but also generate considerable noise pollution. Due to the instability of the airflow during the collision process, vibrations and resonance may occur, further increasing the system's noise level. Furthermore, the turbulent characteristics of the airflow can affect the equipment's energy efficiency and reduce overall performance. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a fan blade that improves noise levels and enhances overall performance.

[0004] A fan blade according to an embodiment of the present invention includes: a shaft connecting portion; a blade body connected to the radially outer side of the shaft connecting portion, the blade body having a first side surface and a second side surface, the first side surface and the second side surface being disposed opposite to each other; a pushing portion disposed on the first side surface, the pushing portion defining a pushing air passage between the pushing portion and the blade body; wherein, the fan blade has a preset plane, the preset plane being perpendicular to the central axis of the fan blade, and the shaft connecting portion being at least partially located on the preset plane; wherein, the first side surface is constructed as a first arcuate surface, the first arcuate surface being curved toward a direction away from the preset plane.

[0005] According to the embodiment of the present invention, the first side of the fan blade is constructed as a first arc-shaped surface. By utilizing the structural characteristics of the first arc-shaped surface, the airflow can flow smoothly on the surface of the fan blade. The fan blade plays a guiding role, reducing turbulence characteristics, avoiding vibration and resonance, thereby reducing impact noise, improving energy utilization, and enhancing overall performance.

[0006] In some embodiments, the shaft connection portion is provided with a mounting hole for a rotating shaft that drives the fan blade to rotate to pass through. The mounting hole is located on the preset plane, and the distance between the preset plane and the shaft connection portion gradually increases in the direction away from the central axis.

[0007] In some embodiments, the shaft connection is configured as an arc-shaped structure, which bends away from the preset plane.

[0008] In some embodiments, the arcuate structure is smoothly connected to the second side surface.

[0009] According to an embodiment of the present invention, the cooking appliance has a cooking cavity and includes: a reflector that defines a portion of the space of the cooking cavity, the reflector having a clearance hole communicating with the cooking cavity, and a rotating shaft disposed within the clearance hole; a heating element disposed within the cooking cavity; and a fan blade, the fan blade being the aforementioned fan blade, disposed within the cooking cavity and connected to the rotating shaft; wherein the reflector includes: a cover body; and a flow guiding structure disposed on one side of the cover body, the fan blade at least partially corresponding to the flow guiding structure.

[0010] According to the embodiments of the present invention, the cooking appliance, by setting the aforementioned fan blades, gradually increases the distance between the preset plane and the second side in the direction away from the central axis. The fan blades play a guiding role, preventing the airflow disturbed by the fan blades from colliding vertically with the surrounding cover, avoiding vibration and resonance, thereby reducing impact noise, improving energy utilization, and enhancing overall performance.

[0011] In some embodiments, the airflow guiding structure has a first arc segment, the center of which is located on the side of the first arc segment facing the cooking cavity, and at least a portion of the projection of the air-pushing part falls into the projection of the first arc segment along a direction perpendicular to the preset plane.

[0012] In some embodiments, the cover body further includes an outlet structure located on the opposite side of the cover body, the outlet structure having a gradually increasing width.

[0013] In some embodiments, the outlet structure has a second arc segment, the center of which is located on the side of the second arc segment away from the cooking cavity; the second arc segment has a first end and a second end, the first end being connected to the cover body or integrally formed with the cover body.

[0014] In some embodiments, the cooking appliance further includes: a pot body, the reflector being disposed above the pot body, the pot body and the reflector together defining the cooking cavity; along a direction perpendicular to the preset plane, the side wall projection of the opening end of the pot body falls within the projection range of the second end of the second arc segment.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a side view of the fan blade in an embodiment of the present invention, with the arrow pointing in the direction of airflow;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the middle fan blade;

[0019] Figure 3 for Figure 1 Top view of the middle fan blade;

[0020] Figure 4 This is a cross-sectional view of the cooking utensil in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram showing the structural dimensions of various parts of the cooking appliance in the embodiments of this utility model;

[0022] Figure 6 This is a diagram showing the airflow pattern inside an air fryer in related technologies.

[0023] Figure 7 This is a cloud map of airflow velocity inside an air fryer in related technologies;

[0024] Figure 8 This is a diagram showing the airflow direction inside the air fryer in this embodiment of the present invention;

[0025] Figure 9 This is a cloud map showing the airflow velocity inside the air fryer in this embodiment of the present invention.

[0026] Figure label:

[0027] 100. Fan blades;

[0028] 10. Shaft connection part; 11. Mounting hole;

[0029] 20. Blade body; 21. First side surface; 22. Second side surface; 30. Propeller section; 31. Propeller duct; 40. Preset plane;

[0030] 1000. Cooking utensil; 200. Reflector; 202. Main body of the reflector; 203. Flow guiding structure; 2031. First arc segment; 204. Outlet structure; 2041. Second arc segment; 300. Heating element; 400. Pot body; 500. Frying bucket. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of the same feature, used to distinguish and describe features, without any order or distinction of importance.

[0034] In the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The fan blade 100 of this utility model embodiment is described below with reference to the accompanying drawings.

[0037] Reference Figure 1 , Figure 2 According to an embodiment of the present utility model, a fan blade 100 includes: a shaft connecting part 10, a blade body 20, and a wind-pushing part 30.

[0038] The blade body 20 is connected to the radially outer side of the shaft connection portion 10. The blade body 20 has a first side surface 21 and a second side surface 22, which are arranged opposite to each other. The air-pushing portion 30 is provided on the first side surface 21, and an air-pushing duct 31 is defined between the air-pushing portion 30 and the blade body 20. The fan blade 100 has a preset plane 40, which is perpendicular to the central axis of the fan blade 100. The shaft connection portion 10 is at least partially located on the preset plane 40. In the direction away from the central axis, the distance between the preset plane 40 and the first side surface 21 gradually increases. The first side surface 21 is constructed as a first arcuate surface, which is curved in the direction away from the preset plane 40. In the direction away from the central axis, the distance between the preset plane 40 and the first side surface 21 gradually increases.

[0039] The shaft connecting part 10 is used to connect to an external rotating shaft, such as the rotating shaft of a motor, thereby driving the entire fan blade 100 to rotate. The blade body 20 is located radially outside the shaft connecting part 10. In the radial direction, the shaft connecting part 10 is located in the middle position, with the direction towards the rotation center of the fan blade 100 being inward and the direction away from the rotation center of the fan blade 100 being outward. The first side surface 21 and the second side surface 22 are two sides of the blade body 20. The first side surface 21 and the second side surface 22 are opposite surfaces. For example, the blade body 20 is placed horizontally, with the upper end surface being the first side surface 21 and the lower end surface being the second side surface 22, or the upper end surface being the second side surface 22 and the lower end surface being the first side surface 21.

[0040] The air-pushing part 30 is located on one side of the blade body 20. The air-pushing duct 31 defined between the air-pushing part 30 and the blade body 20 pushes the air to form an airflow.

[0041] The preset plane 40 is a virtual plane. For example, if the fan blade 100 is placed horizontally, the preset plane 40 is a horizontal plane, and the horizontal plane is perpendicular to the central axis of the fan blade 100.

[0042] The first arc surface is arc-shaped and bends away from the preset plane 40. In the direction away from the central axis of the fan blade 100, the distance between the first arc surface and the preset plane 40 gradually increases.

[0043] In electrical equipment, fan blades are a key component, widely used in air fryers, fans, air conditioners, and other devices. However, the direct collision between the airflow from the fan blade's outlet and the surrounding enclosure often results in strong airflow impacts. These impacts not only cause significant loss of airflow kinetic energy but also generate considerable noise pollution. Due to the instability of the airflow during the collision process, vibrations and resonance may occur, further increasing the system's noise level. Furthermore, the turbulent characteristics of the airflow can affect the equipment's energy efficiency and reduce overall performance.

[0044] In this embodiment of the utility model, by setting a first arc-shaped surface, the first arc-shaped surface bends in a direction away from the preset plane 40, and the first arc-shaped surface guides the flow of air, so that the airflow will not collide perpendicularly with the surrounding cover. Moreover, the arc-shaped surface fits the airflow path, avoiding collision between the airflow and the surface of the fan blade 100, reducing turbulence characteristics, improving stability, further avoiding vibration and resonance, reducing impact noise, improving energy utilization, and enhancing overall performance.

[0045] For example, the fan blade 100 is set inside the cover. The fan blade 100 is set horizontally, and the first arc surface guides the airflow, so that the airflow has an angle with the cover. Compared with the scheme where the airflow blows vertically to the cover, the impact is reduced, the noise is reduced, the energy utilization rate is improved, and the overall performance is enhanced.

[0046] For example, the fan blade 100 is placed horizontally with the first arc-shaped surface facing downwards, and the preset plane 40 is located above the first arc-shaped surface, with the first arc-shaped surface curving downwards; or, the first arc-shaped surface faces upwards, and the preset plane 40 is located below the first arc-shaped surface, with the first arc-shaped surface curving upwards.

[0047] According to the embodiment of the present invention, the first side surface 21 of the fan blade 100 is constructed as a first arc-shaped surface. By utilizing the structural characteristics of the first arc-shaped surface, the airflow can flow smoothly on the surface of the fan blade. The fan blade 100 plays a guiding role, reduces turbulence characteristics, avoids vibration and resonance, thereby reducing impact noise, improving energy utilization, and enhancing overall performance.

[0048] Reference Figure 1 , Figure 2 Specifically, the angle Y0 between the tangent at each point on the first side 21 and the preset plane 40 is greater than 0° and less than 90°, so as to give full play to the flow guiding effect.

[0049] Reference Figure 1 , Figure 2 In some embodiments, the shaft connection portion 10 is provided with a mounting hole 11 for passing through a rotating shaft that drives the fan blade 100 to rotate. The mounting hole 11 is located on a preset plane 40, and the distance between the preset plane 40 and the shaft connection portion 10 gradually increases in the direction away from the central axis.

[0050] The rotating shaft passes through the mounting hole 11, and the shaft connection part 10 drives the fan blade 100 to rotate. The mounting hole 11 is located at the end of the fan blade 100. In the direction away from the central axis, the distance between the preset plane 40 and the shaft connection part 10 gradually increases. That is to say, the shaft connection part 10 has a certain curvature and plays a guiding role.

[0051] In the above scheme, in the direction away from the central axis, by setting the distance between the shaft connection part 10 and the preset plane 40 to gradually increase, the shaft connection part 10 plays a guiding role and guides the flow of air. At the same time, the smooth connection between the shaft connection part 10 and the blade body 20 makes the airflow more orderly, improves the problem of airflow turbulence, and thus improves the performance of the fan blade 100.

[0052] Specifically, the cross-section of the shaft connection portion 10 can be a straight line, and the distance between the preset plane 40 and the straight line gradually increases in the direction away from the central axis; the cross-section of the shaft connection portion 10 can be an arc, and the distance between the preset plane 40 and the arc gradually increases in the direction away from the central axis.

[0053] Reference Figure 1 , Figure 2 In some embodiments, the shaft connection portion 10 is constructed as an arc-shaped structure, which bends toward a direction away from the preset plane 40.

[0054] The shaft connection part 10 has an arc-shaped structure, which bends away from the preset plane 40. In the direction away from the central axis of the fan blade 100, the distance between the arc-shaped structure and the preset plane 40 gradually increases.

[0055] In the above scheme, by setting an arc-shaped structure, the arc-shaped structure bends in a direction away from the preset plane 40, and the arc-shaped structure guides the flow of air, so that the airflow will not collide perpendicularly with the surrounding cover, thereby avoiding vibration and resonance, reducing impact noise, and improving energy utilization. The arc-shaped structure fits better with the first arc-shaped surface, so that the shaft connection 10 and the blade body 20 are connected more smoothly, making the airflow more orderly, improving the problem of airflow turbulence, and thus improving the performance of the fan blade 100.

[0056] For example, the fan blade 100 is placed horizontally, with the preset plane 40 located above the arc-shaped structure, which is bent downwards; or, the preset plane 40 is located below the arc-shaped structure and is bent upwards.

[0057] In some specific embodiments, the arc-shaped structure is smoothly connected to the second side 22, that is, there is an arc transition between the arc-shaped structure and the second side 22, which avoids obstructing the flow of air, makes the airflow more orderly, and improves the overall performance.

[0058] In some specific embodiments, the fan blade 100 is a spherical fan blade 100, and each part of the spherical fan blade 100 is an arc-shaped surface, thereby guiding the airflow. This avoids severe vertical collisions between the airflow and the cover, and thus directs more airflow to the blasting barrel 500 below. This not only reduces impact noise, but also improves energy utilization.

[0059] Reference Figures 1 to 3In some embodiments, the outer diameter of the blade body 20 is D0, the outer diameter of the shaft connection portion 10 is D1, and 0.48≤D1 / D0≤0.68.

[0060] The blade body 20 is connected to the outer side of the shaft connection part 10, and the outer diameter of the blade body 20 is larger than the outer diameter of the shaft connection part 10.

[0061] In related technologies, the ratio between the outer diameter of the shaft connection and the outer diameter of the blade body is less than 0.48, resulting in the blade body occupying too large a radial dimension of the fan blade, making it difficult for the fan blade to disturb the airflow and resulting in high energy consumption; or, the ratio between the outer diameter of the shaft connection and the outer diameter of the blade body is greater than 0.68, resulting in the blade body occupying too small a radial dimension of the fan blade, resulting in a small disturbance range, which cannot fully disturb the airflow and results in low performance.

[0062] In the above solution, by setting the ratio between the outer diameter of the shaft connection part 10 and the outer diameter of the blade body 20 to be in the range of 0.48 to 0.68, the overall performance is improved and adapted to the needs of the cooking appliance 1000, while ensuring that the fan blade 100 fully disturbs the airflow.

[0063] For example, D1 / D0 is 0.48; or, D1 / D0 is 0.5; or, D1 / D0 is 0.52; or, D1 / D0 is 0.54; or, D1 / D0 is 0.56; or, D1 / D0 is 0.58; or, D1 / D0 is 0.6; or, D1 / D0 is 0.62; or, D1 / D0 is 0.64; or, D1 / D0 is 0.68.

[0064] Reference Figures 1 to 3 In some embodiments, the angle between the tangent of the profile at the outlet of the air-pushing section 30 and the tangent of the rotation direction of the fan blade 100 at the outlet is the outlet installation angle, which is b1, 68°≤b1≤81°.

[0065] The outlet installation angle is common knowledge and will not be explained further here. In this embodiment of the invention, the outlet installation angle b1 is controlled within the range of 68° to 81° to control the pressure of the airflow on the pusher 30, so that the pressure is within a certain range, reducing the probability of deformation of the fan blade 100, while giving full play to the structural performance of the fan blade 100 and improving the overall performance of the fan blade 100.

[0066] For example, the outlet installation angle b1 is 68°; or, the outlet installation angle b1 is 70°; or, the outlet installation angle b1 is 72°; or, the outlet installation angle b1 is 74°; or, the outlet installation angle b1 is 76°; or, the outlet installation angle b1 is 78°; or, the outlet installation angle b1 is 80°; or, the outlet installation angle b1 is 81°.

[0067] Reference Figures 1 to 3 In some embodiments, the angle between the tangent of the profile at the inlet of the air-pushing section 30 and the tangent of the rotation direction of the blade at the inlet is the inlet installation angle, which is b2, 63°≤b2≤78°.

[0068] The inlet installation angle is common knowledge and will not be explained further here. In this embodiment of the invention, the inlet installation angle b2 is controlled within the range of 63° to 78°, which controls the angle of attack of the airflow at the inlet of the push section 30, avoids excessive angle of attack, thereby reducing energy loss and improving impact noise.

[0069] For example, the inlet mounting angle b2 is 63°; or, the inlet mounting angle b2 is 65°; or, the inlet mounting angle b2 is 67°; or, the inlet mounting angle b2 is 69°; or, the inlet mounting angle b2 is 71°; or, the inlet mounting angle b2 is 73°; or, the inlet mounting angle b2 is 75°; or, the inlet mounting angle b2 is 77°; or, the inlet mounting angle b2 is 78°.

[0070] Reference Figure 4 According to an embodiment of the present utility model, the cooking appliance 1000 has a cooking cavity and includes: a reflector 200, a heating element 300, and a fan blade 100.

[0071] The reflector 200 restricts part of the space of the cooking cavity. The reflector 200 has a clearance hole communicating with the cooking cavity, and a rotating shaft is installed in the clearance hole. The heating element 300 is installed inside the cooking cavity. The fan blade 100 is the aforementioned fan blade 100, which is installed inside the cooking cavity and connected to the rotating shaft. The reflector 200 includes: a main body 202 and a flow guiding structure 203. The flow guiding structure 203 is located on one side of the main body 202, and the fan blade 100 at least partially corresponds to the flow guiding structure 203.

[0072] The cooking cavity is the internal space of the cooking appliance 1000, where the food to be cooked is placed for cooking. The reflector 200 is part of the structure of the cooking appliance 1000; it, along with other components, encloses the cooking cavity, such as the pot body 400 described below. The inner wall of the reflector 200 forms part of the wall of the cooking cavity. The rotating shaft can be the output shaft of a motor, which is connected to the fan blades 100, driving them to rotate.

[0073] The heating element 300 is located inside the cooking cavity and generates heat. The fan blades 100 are also located inside the cooking cavity and agitate the heated air to form an airflow. The flowing hot air heats the food to be cooked. For example, the heating element 300 is a heating tube, which generates heat to cook the food.

[0074] Specifically, cooking appliance 1000 refers to an air cooking appliance, such as an air fryer, but it can also refer to other cooking appliances, such as heat radiation cooking appliances, specifically, such as ovens.

[0075] According to the embodiment of the present utility model, the cooking appliance 1000, by setting the fan blade 100 as described above, constructs the first side surface 21 as a first arc-shaped surface. Utilizing the structural characteristics of the first arc-shaped surface, the airflow flows smoothly on the surface of the fan blade. The fan blade 100 plays a guiding role, reduces turbulence characteristics, avoids vibration and resonance, thereby reducing impact noise, improving energy utilization, and enhancing overall performance.

[0076] In some embodiments, the flow guiding structure 203 has a first arc segment 2031, the center of which is located on the side of the first arc segment 2031 facing the cooking cavity, and at least a portion of the projection of the pusher 30 falls into the projection of the first arc segment 2031 along a direction perpendicular to the preset plane 40.

[0077] The center of the first arc segment 2031 is located on the side of the first arc segment 2031 facing the cooking cavity. In other words, the first arc segment 2031 bends inward and plays a guiding role, directing the airflow to the outlet structure 204.

[0078] In the above scheme, by setting the projection of the air-pushing part 30 to fall at least part into the projection of the first arc segment 2031, the airflow disturbed by the air-pushing part 30 flows to the first arc segment 2031, and the first arc segment 2031 fully exerts its guiding role to guide the airflow.

[0079] Reference Figure 4 In some embodiments, the cover body 202 includes an outlet structure 204.

[0080] The outlet structure 204 is located on the opposite side of the main body 202 of the cover, and the width of the outlet structure 204 gradually increases.

[0081] The fan blade 100 is located inside the reflector 200. The airflow guiding structure 203 plays a guiding role, guiding the airflow towards the outlet structure 204, and the airflow is discharged from the outlet structure 204.

[0082] In the above scheme, by setting an outlet structure 204 with a gradually increasing width, the outlet structure 204 is used to guide the airflow, improve the turbulence of the airflow, and improve the overall performance.

[0083] Specifically, the guide structure 203 is connected to the upper part of the cover body 202, and the outlet structure 204 is connected to the lower part of the cover body 202. In the downward direction, the width of the outlet structure 204 gradually increases to form a funnel-shaped structure to guide the airflow.

[0084] In some embodiments, the outlet structure 204 has a second arc segment 2041, the center of which is located on the side of the second arc segment 2041 away from the cooking cavity; the second arc segment 2041 has a first end and a second end, the first end being connected to the cover body 202 or integrally formed with the cover body 202.

[0085] The center of the second arc segment 2041 is located on the side of the second arc segment 2041 away from the cooking cavity. In other words, the second arc segment 2041 bends outward and smoothly discharges airflow.

[0086] In the above scheme, by setting a second arc segment 2041, the center of the second arc segment 2041 is located on the side of the second arc segment 2041 away from the cooking cavity, and the radius of the second arc segment 2041 is in a certain proportion with the fan blade 100, the dynamic pressure is fully converted into static pressure, which increases the static pressure and penetrating power of the airflow, thereby improving the cooking effect.

[0087] In some specific embodiments, the second arc segment 2041 and the cover body 202 are two parts, with the first end connected to the cover body 202; in other specific embodiments, the second arc segment 2041 is integrally formed on the cover body 202, with the first end integrally formed with the cover body 202.

[0088] Reference Figure 4 , Figure 5 In some embodiments, the outer diameter of the blade body 20 is D0, and the width of the cover body 202 is W1, where 1.45≤W1 / D0≤2.04.

[0089] In this configuration, the fan blade 100 is located inside the reflector 200, which covers the fan blade 100. The size of the reflector 200 is larger than that of the fan blade 100. The airflow disturbed by the fan blade 100 acts on the reflector 200, which guides the airflow.

[0090] In the above scheme, by setting the width of the cover body 202 and the outer diameter of the blade body 20 within a certain range, the gap between the fan blade 100 and the reflector 200 is controlled, avoiding the problem of increased airflow resistance caused by too small a gap, and at the same time avoiding the problem of reduced guiding effect caused by too large a gap, thus improving the overall performance.

[0091] For example, W1 / D0 is 1.45; or, W1 / D0 is 1.5; or, W1 / D0 is 1.55; or, W1 / D0 is 1.6; or, W1 / D0 is 1.65; or, W1 / D0 is 1.7; or, W1 / D0 is 1.75; or, W1 / D0 is 1.8; or, W1 / D0 is 1.85; or, W1 / D0 is 1.9; or, W1 / D0 is 1.95; or, W1 / D0 is 2; or, W1 / D0 is 2.04.

[0092] In some embodiments, the cooking appliance 100 further includes: a pot body 400, a reflector 200 covering the pot body 400, the pot body 400 and the reflector 200 together defining a cooking cavity; along a direction perpendicular to the preset plane 40, the side wall projection of the opening end of the pot body 400 falls within the projection range of the second end of the second arc segment 2041.

[0093] In the direction perpendicular to the preset plane 40, the side wall projection of the open end of the pot body 400 falls within the projection range of the second end of the second arc segment 2041, and the open end of the pot body 400 is located within the enclosure of the second arc segment 2041.

[0094] In the above solution, by setting the side wall projection of the open end of the pot body 400 to fall within the projection range of the second end of the second arc segment 2041, all airflow is directed into the pot body 400, avoiding waste and improving cooking efficiency.

[0095] In some embodiments, the cooking appliance further includes a fryer bucket 500.

[0096] A reflector 200 is positioned above the pot body 400, and the pot body 400 and the reflector 200 together define the cooking cavity. The side wall of the pot body 400 has an inlet and outlet. The frying bucket 500 is retractably installed through the inlet and outlet.

[0097] In some embodiments, the outer diameter of the blade body 20 is D0, the width of the cover body 202 is W1, 1.45≤W1 / D0≤2.04, the radius of the first arc segment 2031 is R1, 0.13≤R1 / D0≤0.23, the arc of the first arc segment 2031 is Y1, 67°Л / 180°≤Y1≤22°Л / 45°, the radius of the second arc segment 2041 is R2, 0.11≤R2 / D0≤0.21, the arc of the second arc segment 2041 is Y2, 7°Л / 30°≤Y2≤73°Л / 180°, and the maximum width of the frying barrel 500 is W2, 1.29≤W2 / D0≤1.82.

[0098] Reference Figure 4 , Figure 5In some specific embodiments, the flow guiding structure 203 has a first arc segment 2031, the center of the first arc segment 2031 is located on the side of the first arc segment 2031 facing the cooking cavity, and the radius of the first arc segment 2031 is R1, 0.13≤R1 / D0≤0.23.

[0099] In the above scheme, by setting R1 / D0 in the range of 0.13 to 0.23, the ratio of the first arc segment 2031 to the blade body 20 is controlled, avoiding the backflow problem caused by R1 / D0 being too small, and at the same time avoiding the problem of reduced flow guiding effect caused by R1 / D0 being too large. This embodiment of the utility model improves the flow guiding effect while avoiding the backflow problem.

[0100] For example, R1 / D0 is 0.13; or, R1 / D0 is 0.15; or, R1 / D0 is 0.17; or, R1 / D0 is 0.19; or, R1 / D0 is 0.21; or, R1 / D0 is 0.23.

[0101] Reference Figure 4 , Figure 5 In some specific embodiments, the arc of the first arc segment 2031 is Y1, 67°Л / 180°≤Y1≤22°Л / 45°.

[0102] The first arc segment 2031 has a certain curvature, and the angle range of the first arc segment 2031 is 67°~88°. The first arc segment 2031 guides the airflow to the outlet structure 204.

[0103] In the above scheme, by setting the arc Y1 of the first arc segment 2031 within the range of 67°Л / 180° to 22°Л / 45°, the problem of airflow directly colliding with the reflector 200 due to the arc being too small is avoided, while the problem of poor airflow guiding effect due to the arc being too large is also avoided, thereby allowing the airflow to flow more smoothly to the outlet structure 204 and improving the overall performance.

[0104] Specifically, the starting point of the first arc segment 2031 is the highest point, the first arc segment 2031 extends downward, and the line connecting the starting point and the center of the circle is a vertical line.

[0105] For example, Y1 is 67°Л / 180°; or, Y1 is 72°Л / 180°; or, Y1 is 77°Л / 180°; or, Y1 is 82°Л / 180°; or, Y1 is 88°Л / 180°.

[0106] In some specific embodiments, the outlet structure 204 has a second arc segment 2041, the center of which is located on the side of the second arc segment 2041 away from the cooking cavity, and the radius of the second arc segment 2041 is R2, 0.11≤R2 / D0≤0.21.

[0107] For example, R2 / D0 is 0.11; or, R2 / D0 is 0.12; or, R2 / D0 is 0.14; or, R2 / D0 is 0.16; or, R2 / D0 is 0.18; or, R2 / D0 is 0.2; or, R2 / D0 is 0.21.

[0108] Reference Figure 4 , Figure 5 In some specific embodiments, the arc of the second arc segment 2041 is Y2, where 7°Л / 30°≤Y2≤73°Л / 180°.

[0109] The second arc segment 2041 has a certain curvature, and the angle range of the second arc segment 2041 is 42°~73°. The second arc segment 2041 converts dynamic pressure into static pressure.

[0110] In the above scheme, by setting the arc Y1 of the first arc segment 2031 within the range of 7°Л / 30° to 73°Л / 180°, the problem of poor conversion effect caused by too small an arc is avoided, while the problem of increased volume caused by too large an arc is also avoided. The conversion effect is guaranteed while reducing the overall volume.

[0111] Specifically, the starting point of the second arc segment 2041 is the highest point. The second arc segment 2041 extends downwards, and the line connecting the starting point and the center of the circle is a vertical line. It can be understood that the cooking utensil 1000 is usually placed on a horizontal surface, and the line connecting the starting point and the center of the circle is a vertical line, which is more suitable for the environment.

[0112] Reference Figure 4 , Figure 5 In some specific embodiments, the cooking appliance 1000 also includes a pot body 400 and a frying bucket 500.

[0113] A reflector 200 is positioned above the frying drum. The pot body 400 and the reflector 200 together define the cooking cavity. The pot body 400 has an inlet / outlet on its side wall. The frying drum 500 is retractably installed through the inlet / outlet. The maximum width of the frying drum 500 is W2, where 1.29 ≤ W2 / D0 ≤ 1.82.

[0114] The pot body 400 has an inlet and outlet, and the frying bucket 500 is removably inserted through the inlet and outlet. The frying bucket 500 is pulled out from the inlet and outlet, and the food to be cooked can be placed inside the frying bucket 500. Then the frying bucket 500 is put into the inlet and outlet, and the food to be cooked enters the cooking space. The fan blades 100 turbulent the heated air to form an airflow, and the airflow flows around the food to be cooked, thereby cooking the food.

[0115] In the above solution, by setting W2 / D0 within the range of 1.29 to 1.82, the problem of insufficient food quantity caused by an excessively small W2 / D0 is avoided. At the same time, the problem of excessively large frying tub 500 affecting airflow is also avoided. It is understandable that an excessively large frying tub 500 may obstruct the airflow to the bottom of the frying tub 500, resulting in poor cooking effect for the food at the bottom of the space inside the frying tub 500.

[0116] For example, W2 / D0 is 1.29; or, W2 / D0 is 1.34; or, W2 / D0 is 1.39; or, W2 / D0 is 1.44; or, W2 / D0 is 1.49; or, W2 / D0 is 1.54; or, W2 / D0 is 1.59; or, W2 / D0 is 1.64; or, W2 / D0 is 1.69; or, W2 / D0 is 1.74; or, W2 / D0 is 1.79; or, W2 / D0 is 1.82.

[0117] The following combination Figures 1 to 9 This describes a specific embodiment of the cooking appliance 1000 of the present invention.

[0118] Cooking appliance 1000 is an air fryer, which includes: pot body 400, reflector 200, heating element 300, fan blade 100 and frying drum 500.

[0119] A reflector 200 is positioned above the pot body 400. The pot body 400 and the reflector 200 together define the cooking cavity. The side wall of the pot body 400 has an inlet and outlet, and the frying bucket 500 is retractably installed through the inlet and outlet. The heating element 300 is located inside the cooking cavity, and the fan blade 100 is also installed inside the cooking cavity.

[0120] The reflector 200 includes a main body 202, a flow guiding structure 203, and an outlet structure 204. The flow guiding structure 203 is located on the upper side of the main body 202, and the fan blades 100 at least partially correspond to the flow guiding structure 203. The outlet structure 204 is located on the lower side of the main body 202, and the width of the outlet structure 204 gradually increases. The flow guiding structure 203 has a first arc segment 2031, the center of which is located on the side of the first arc segment 2031 facing the cooking cavity. The outlet structure 204 has a second arc segment 2041, the center of which is located on the side of the second arc segment 2041 away from the cooking cavity.

[0121] The fan blade 100 includes a shaft connecting portion 10, a blade body 20, and a propulsion portion 30. The blade body 20 is connected to the radially outer side of the shaft connecting portion 10. The blade body 20 has a first side surface 21 and a second side surface 22, which are disposed opposite to each other. The propulsion portion 30 is disposed on the first side surface 21, and a propulsion duct 31 is defined between the propulsion portion 30 and the blade body 20.

[0122] The fan blade 100 has a preset plane 40, which is perpendicular to the central axis of the fan blade 100. The shaft connection portion 10 is at least partially located on the preset plane 40. In the direction away from the central axis, the distance between the preset plane 40 and the first side surface 21 gradually increases. The shaft connection portion 10 is provided with a mounting hole 11 for a rotating shaft that drives the fan blade 100 to rotate. The mounting hole 11 is located on the preset plane 40, and in the direction away from the central axis, the distance between the preset plane 40 and the shaft connection portion 10 gradually increases.

[0123] The outer diameter D0 of the blade body 20 is 124 mm, the outer diameter D1 of the shaft connection 10 is 67 mm, the width W1 of the cover body 202 is 211 mm, the radius R1 of the first arc segment 2031 is 18 mm, the radius R2 of the second arc segment 2041 is 16 mm, and the maximum width W2 of the frying barrel 500 is 188 mm. That is, D1 / D0 is 0.54, W1 / D0 is 1.7, R1 / D0 is 0.15, R2 / D0 is 0.12, and W2 / D0 is 1.51.

[0124] In related technologies, the upper surface of a conventional fan blade is parallel to the horizontal plane, and the airflow flows out radially horizontally, colliding perpendicularly with the casing. In cooking tests conducted on the entire machine using a conventional fan blade, the dehydration rate was 41.2%, the wind speed in the middle of the food was 1.85 m / s, and the noise level was 59 dB. (Reference) Figure 6 As can be seen, the red hot air collides vertically with the surrounding enclosure, resulting in significant heat loss; (Refer to...) Figure 7 Uneven wind speed in the middle of the food and low overall wind speed affect the cooking effect; the top and bottom of the cooked food are light in color and have poor coloring effect.

[0125] In this embodiment of the invention, the fan blade 100 is installed in the air fryer, significantly increasing the wind speed. The average wind speed in the middle of the food reaches 2.51 m / s, an increase of 35.7%. The food dehydration rate reaches 50.3464%, an increase of 22.2%, and the noise is reduced by 4.6 dB. (Refer to...) Figure 8 As can be seen, the red hot air contacts the reflector 200 at a certain angle, reducing heat loss and allowing more hot air to enter the pot body 400; (Refer to...) Figure 9 The airflow is uniform in the middle of the food, which improves the cooking effect; the top and bottom of the cooked food are dark in color, resulting in good coloring.

[0126] Other configurations and operations of the fan blade 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0127] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. 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.

[0128] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fan blade, characterized in that, include: Shaft connection part; A blade body is connected to the radially outer side of the shaft connection portion. The blade body has a first side surface and a second side surface, which are disposed opposite to each other. A propulsion section is provided on the first side surface, and a propulsion air duct is defined between the propulsion section and the blade body; wherein... The fan blade has a preset plane, the preset plane being perpendicular to the central axis of the fan blade, and the shaft connection portion being at least partially located on the preset plane; wherein, The first side is constructed as a first arc-shaped surface, which is curved in a direction away from the preset plane.

2. The fan blade according to claim 1, characterized in that, The shaft connection portion is provided with a mounting hole for passing through the shaft that drives the fan blade to rotate. The mounting hole is located on the preset plane, and the distance between the preset plane and the shaft connection portion gradually increases in the direction away from the central axis.

3. The fan blade according to claim 2, characterized in that, The shaft connection is constructed as an arc-shaped structure, which bends away from the preset plane.

4. The fan blade according to claim 3, characterized in that, The arc-shaped structure is smoothly connected to the second side surface.

5. A cooking utensil, characterized in that, The cooking appliance has a cooking cavity, including: A reflector, which restricts part of the space of the cooking cavity, is provided with a clearance hole communicating with the cooking cavity, and a rotating shaft is provided in the clearance hole; A heating element, wherein the heating element is disposed within the cooking cavity; The fan blade is the fan blade according to any one of claims 1 to 4, the fan blade is disposed in the cooking cavity and connected to the rotating shaft; The reflector includes: The main body of the cover; A flow guiding structure is provided on one side of the cover body, and the fan blades at least partially correspond to the flow guiding structure.

6. The cooking utensil according to claim 5, characterized in that, The airflow guiding structure has a first arc segment, the center of which is located on the side of the first arc segment facing the cooking cavity. Along a direction perpendicular to the preset plane, at least a portion of the projection of the air-pushing part falls into the projection of the first arc segment.

7. The cooking utensil according to claim 6, characterized in that, The main body of the cover also includes an outlet structure, which is located on the opposite side of the main body of the cover, and the width of the outlet structure gradually increases.

8. The cooking utensil according to claim 7, characterized in that, The outlet structure has a second arc segment, the center of which is located on the side of the second arc segment away from the cooking cavity; The second arc segment has a first end and a second end, the first end being connected to the cover body or integrally formed with the cover body.

9. The cooking utensil according to claim 8, characterized in that, Also includes: The pot body, with the reflector positioned above it, together defining the cooking cavity; Along a direction perpendicular to the preset plane, the side wall projection of the pot opening falls within the projection range of the second end of the second arc segment.

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