Impeller and cooking appliance

Abstract

This application relates to the field of kitchen appliance technology, and particularly to an impeller and cooking appliance. The impeller includes a body and multiple fan blades. The body is adapted to connect to a shaft for driving the impeller. The multiple fan blades are arranged sequentially at intervals around the body and are respectively connected to the body. Each fan blade includes a blade portion and a pusher blade. The blade portion is connected to the body and extends along the plane of rotation of the impeller. The pusher blade is connected to the blade portion and bends relative to the blade portion. The bending direction of the pusher blade relative to the blade portion intersects the plane of rotation. The pusher blade has a first pusher end relatively far from the body portion and a second pusher end relatively close to the body portion. The pusher blade includes a first side away from the blade portion, which includes a continuously connected curved section and a straight section. The arc of the curved section intersects the straight line of the straight section. The impeller provided in this application has a relatively large air volume.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, and in particular to an impeller and cooking appliance. Background Technology

[0002] Air fryers, ovens, and other air-cooking appliances work by using hot air to penetrate food, removing moisture and cooking it. Therefore, their cooking effect is primarily influenced by the speed and direction of the airflow, which is guided by the air duct, and the airflow speed is mainly affected by the impeller's performance. In the past, many researchers focused primarily on optimizing the air duct, with little research on the impeller. However, the cooking effect of air-cooking appliances is not only affected by the air duct, but the impeller also has a decisive impact. Currently, impellers on the market often only consider ease of manufacturing, neglecting the design of the impeller structure. This results in weak impeller performance, low airflow, and consequently reduced cooking efficiency in appliances using such impellers. Summary of the Invention

[0003] This application provides an impeller, and this application also provides a cooking appliance.

[0004] In a first aspect, this application provides an impeller, which includes a body and a plurality of blades; the body is adapted to be connected to a shaft for driving the impeller; the plurality of blades are arranged sequentially at intervals around the body and are respectively connected to the body; the plurality of blades include blade portions and pusher blades; the blade portions are connected to the body and extend along the plane of rotation of the impeller; the pusher blades are connected to the blade portions and bend relative to the blade portions, and the bending direction of the pusher blades relative to the blade portions intersects the plane of rotation; the pusher blades have a first pusher end relatively far from the body and a second pusher end relatively close to the body; the pusher blades include a first side away from the blade portions, the first side being located between the first pusher end and the second pusher end, the first side including a curved edge segment and a straight edge segment connected in succession, the curved edge segment being located at the second pusher end, and the arc of the curved edge segment intersecting the straight line of the straight edge segment.

[0005] Optionally, in some embodiments, the pusher blade further includes a second side connected to the blade portion, the second side having a first end point located at the first pusher end and a second end point located at the second pusher end; the pusher blade extends in a straight line in the direction from the second end point to the first end point.

[0006] Optionally, in some embodiments, the first endpoint is arranged on an outer reference circle centered on the axis of rotation, and the angle β1 between the tangent of the outer reference circle at the first endpoint and the extension of the second side satisfies the relationship: 67°≤β1≤78°.

[0007] Optionally, in some embodiments, the second endpoint is arranged on an inner reference circle centered on the axis of rotation, and the angle β2 between the tangent of the inner reference circle at the second endpoint and the second side satisfies the relationship: 48°≤β2≤65°.

[0008] Optionally, in some embodiments, the outer diameter of the impeller is D, and the length of the second side is L1, where D and L1 satisfy the relationship: 0.21≤L1 / D≤0.32.

[0009] Optionally, in some embodiments, the pusher blade further includes a third side edge located at the first pusher end and connected between the straight edge section and the blade portion, the third side edge extending along a straight line.

[0010] Optionally, in some embodiments, the length of the second side is L1 and the length of the third side is h1, where h1 and L1 satisfy the relationship: 0.38≤h1 / L1≤0.51.

[0011] Optionally, in some embodiments, the outer diameter of the impeller is D, and the height of the pusher blades is h, where h and D satisfy the relationship: 0.08≤h / D≤0.14.

[0012] Optionally, in some embodiments, the length of the second side is L1, the arc where the curved edge segment is located is a circular arc, the radius of the circular arc is R, and R and L1 satisfy the relationship: 0.62≤R / L1≤0.83.

[0013] Optionally, in some embodiments, the arc on which the curved segment is located is a circular arc, and the central angle of the circular arc is Q, which satisfies the relationship: 55°≤Q≤82°.

[0014] Optionally, in some embodiments, the number of fan blades is Z, where Z satisfies the relationship: 9≤Z≤11.

[0015] Optionally, the impeller is configured to rotate about an axis in a specified direction; the pusher blades are connected to the windward side of the blade section when rotating.

[0016] Optionally, the straight edge segment and the curved edge segment are tangent.

[0017] Optionally, the impeller also includes a reinforcing part, which is disposed on the blade portion and extends along the body portion away from the body portion on the blade portion. The reinforcing part is a groove or rib formed on the upper part of the blade.

[0018] Secondly, this application also provides a cooking appliance, which includes a main unit and the impeller, the impeller being rotatably disposed within the main unit.

[0019] In the impeller provided in this application, since a pusher blade is provided on the blade section, and the pusher blade is bent relative to the blade section and the bending direction intersects with the plane of rotation, the impeller can not only disturb the airflow on the plane of rotation when it rotates, but also disturb the airflow in the bending direction of the pusher blade (for example, in the direction perpendicular to the plane of rotation). Therefore, the overall perturbation efficiency of the impeller on the airflow is high, thereby improving the air volume of the impeller.

[0020] Furthermore, the pusher blade has a first pusher end relatively far from the main body and a second pusher end relatively close to the main body. The pusher blade includes a first side edge far from the blade portion, which includes a curved edge section and a straight edge section connected in series. The curved edge section is located at the second pusher end, and the arc of the curved edge section intersects the straight line of the straight edge section. This arrangement gives the second pusher end of the pusher blade a streamlined profile. The second pusher end is relatively closer to the center of rotation, where airflow disturbance is usually stronger and wind resistance is greater. This structural design can reduce the wind resistance experienced by the pusher blade during rotation, thereby reducing the load on the impeller to a certain extent and achieving the effect of increasing the impeller speed. In addition, since the profile of the second pusher end is curved, it can also almost completely throw the airflow impacting the pusher blade outward from the first pusher end roughly along the plane of rotation, thereby increasing the airflow of the impeller. In summary, the impeller provided in this application can increase the air volume and wind speed of the impeller under the same torque, thereby improving the cooking efficiency of cooking appliances using the impeller. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an air fryer provided in some embodiments of this application.

[0023] Figure 2 yes Figure 1 A cross-sectional view of the air fryer along the AA direction.

[0024] Figure 3 This is a schematic diagram of the impeller structure provided in some embodiments of this application.

[0025] Figure 4 yes Figure 3 A magnified view of a portion of the impeller's structure.

[0026] Figure 5 yes Figure 4 A schematic diagram showing the characteristic dimensions of the propeller blades.

[0027] Figure 6 yes Figure 3 A top view of the impeller.

[0028] Figure 7 yes Figure 6 A bottom view of the impeller.

[0029] Figure 8 yes Figure 7 A schematic diagram of the characteristic dimensions of the impeller.

[0030] Figure 9 yes Figure 8 A magnified view of a portion of the impeller.

[0031] Figure 10 yes Figure 8 A schematic diagram of the characteristic dimensions of the impeller.

[0032] Figure 11 yes Figure 10 Left view of the impeller.

[0033] Labeling Explanation: 100, Impeller; 11, Body Section; 13, Fan Blade; 131, Blade Section; 1311, First Blade Side; 1312, Second Blade Side; 1313, Third Blade Side; 1314, Connecting Section; 1315, Blade Body; 133, Propeller Blade; 1331, First Propeller End; 1332, Second Propeller End; 1333, First Side; 1334, Curved Edge Section; 1335, Straight Edge Section ; 1336, Second side; 1337, First end point; 1338, Second end point; 1339, Third side; 15, Reinforcing part; 151, First reinforcing end; 152, Second reinforcing end; 153, First reinforcing edge; 154, Second reinforcing edge; 16, Outer reference circle; 17, Inner reference circle; 200, Cooking utensil; 21, Main unit; 22, Pot body; 23, Handle; 24, Drive motor; 25, Cooking space. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all examples. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0035] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] Furthermore, unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., 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; they can refer to the internal connection of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem and basically achieve the technical effect within a certain margin of error.

[0039] Reference Figure 1 and Figure 2 This application provides an impeller 100 and a cooking appliance 200 incorporating the impeller 100. The cooking appliance 200 can be a kitchen appliance with a baking function, which can use heat to fry food. During operation, the cooking appliance 200 generates hot air through a heating element within the pot, and then uses a fan to blow the high-temperature air into the pot to heat the food. The hot air circulates within the pot, thereby dehydrating the food to achieve a frying effect. Specifically, the cooking appliance 200 can be an air fryer, air oven, air microwave oven, etc. This specification uses an air fryer as an example.

[0040] In this embodiment, the cooking appliance 200 may include a main unit 21, a pot body 22, and the aforementioned impeller 100. The main unit 21 has a receiving cavity, within which both the pot body 22 and the impeller 100 are disposed. The cooking appliance 200 may be a pull-out air fryer, a flip-top air fryer, or a box-type air fryer, etc. For example, this embodiment uses a pull-out air fryer as an example. The pot body 22 has a handle 23, allowing the user to install the pot body 22 into or remove it from the main unit 21 by holding the handle 23. The interior of the pot body 22 forms a cooking space 25, which is the area within the cooking appliance 200 used for holding and cooking food.

[0041] The main unit 21 can house an air duct module, a control module, and a heating module. The control module can be used to control the operation of the drive motor 24 and also to drive the heating module. The main unit 21 includes a housing and a drive motor 24. The housing forms a cavity for accommodating the pot body 22. The drive motor 24 is located inside the housing, with its output shaft facing the cavity. The impeller 100 is connected to the output shaft of the drive motor 24, and together they constitute a centrifugal fan. One side of the impeller 100 faces the cooking space 25. Thus, when the drive motor 24 operates, the impeller 100 rotates, creating a negative pressure on the side of the impeller 100 facing the cooking space 25. This causes the hot air in the cooking space 25 to flow axially towards the impeller 100, and then further flow radially out of the impeller 100 before re-entering the cooking space 25. As the impeller 100 continues to rotate, hot air can circulate between the cooking space 25 and the impeller 100 (see reference). Figure 2 The path indicated by the middle arrow is for reference only and does not limit the airflow pattern. When the hot airflow passes through the food in the cooking space 25, it can remove the moisture from the food, thus cooking it. With the above settings, the impeller 100 can increase the airflow of the air fryer and withstand the increased load due to the increased airflow, thereby improving the cooking efficiency of the air fryer and ensuring safety and reliability.

[0042] Reference Figure 3 , Figure 4 and Figure 5The impeller 100 includes a body portion 11 and a plurality of fan blades 13. The body portion 11 is the main body of the impeller 100 and is located approximately at the center of the impeller 100. The body portion 11 is adapted to be connected to a shaft for driving the impeller 100 to rotate. The shaft may be the output shaft of a drive device (such as the drive motor 24 mentioned above), which drives the impeller 100 to rotate and generate airflow. When the body portion 11 rotates under the drive of the drive motor 24, it has a rotation axis O, which is the axis of the output shaft of the drive motor 24. Therefore, the body portion 11 also has a radial direction, which is a straight line direction perpendicular to the rotation axis O. As an example, the body portion 11 in this specification is described as a generally circular plate. The terms "radial," "axis of rotation," or "axis of rotation" used to refer to the body portion 11 below can be understood as the direction of the radial direction and the axis of rotation O of the body portion 11. Similarly, the term "circumferential" used to refer to the body portion 11 below should be understood as the direction of the outer circumference of the body portion 11. The term "plane of rotation" used below is understood as the plane in which the impeller 100 rotates, which is perpendicular to the axis of rotation O.

[0043] Multiple fan blades 13 are arranged sequentially and at intervals around the body portion 11 along its circumference and are connected to the body portion 11. The fan blades 13 are located radially outward from the body portion 11 and extend radially outward relative to it. The fan blades 13 guide airflow radially along the impeller 100, making the impeller 100 a centrifugal impeller and creating a negative pressure on the axial side of the impeller 100. When the impeller 100 is applied to the cooking appliance 200, with the negative pressure side of the impeller 100 facing the food in the cooking space 25 of the cooking appliance 200, the hot air in the cooking space 25 flows axially towards the impeller 100, then further flows radially out of the impeller 100 and re-enters the cooking space 25. As the impeller 100 rotates continuously, air circulation between the cooking space 25 and the impeller 100 is achieved (see reference). Figure 2 The path indicated by the middle arrow is for reference only and does not limit the airflow pattern. When hot air passes over the food in the cooking space 25, it can remove moisture from the food, thus cooking it.

[0044] In this embodiment, the fan blades 13 are integrally formed with the body 11, for example, by stamping. The number of fan blades 13 is 11. In other embodiments, the fan blades 13 can also be welded, bonded, or bolted to the body 11. The number of fan blades 13 can be any integer not less than 9 and not greater than 11, such as 9 or 10. By limiting the number of fan blades 13 to the above range, the airflow and wind speed of the fan blades 13 can be ensured to be within a relatively optimal range.

[0045] In this embodiment, each fan blade 13 has the same structure, and each fan blade 13 includes a blade portion 131 and a pusher blade 133. In other embodiments, the structures of multiple fan blades 13 may not be completely identical. For example, some fan blades 13 may have the same structure, and fan blades 13 with the same structure include a blade portion 131 and a pusher blade 133. One end of the blade portion 131 is connected to the body portion 11, and the other end extends radially away from the body portion 11. The blade portion 131 extends along the rotation plane of the impeller 100 and is used to rotate with the body portion 11 to generate airflow. The pusher blade 133 is connected to the blade portion 131 and bends relative to the blade portion 131. It is used to rotate with the blade portion 131 and increase the airflow of the impeller 100. The bending direction of the pusher blade 133 relative to the blade portion 131 intersects the rotation plane of the impeller 100, and the included angle between them can be 90° to 150° (including the endpoint). The pusher blade 133 has a first pusher end 1331 relatively far from the body portion 11 and a second pusher end 1332 relatively close to the body portion 11. The pusher blade 133 includes a first side 1333 far from the body portion 131, which is located between the first pusher end 1331 and the second pusher end 1332. The first side 1333 includes a curved section 1334 and a straight section 1335 connected in succession. The curved section 1334 is located at the second pusher end 1332. The curved section 1334 extends along an arc and protrudes in a direction away from the blade portion 131. The straight section 1335 extends along a straight line. The arc of the curved section 1334 intersects the straight line of the straight section 1335. In this embodiment, the arc where the curved edge segment 1334 is located is tangent to the straight line where the straight edge segment 1335 is located. In other embodiments, the arc where the curved edge segment 1334 is located and the straight line where the straight edge segment 1335 is located may only intersect but not be tangent.

[0046] With the above configuration, since the pusher blade 133 is provided on the blade section 131, and the pusher blade 133 is bent relative to the blade section 131 and the bending direction intersects with the plane of rotation, the impeller 100 can not only disturb the airflow on the plane of rotation when it rotates, but also disturb the airflow in the bending direction of the pusher blade 133 (for example, in the direction perpendicular to the plane of rotation). Therefore, the overall disturbance efficiency of the impeller 100 on the airflow is high, thereby improving the air volume of the impeller 100.

[0047] Furthermore, since the pusher blade 133 has a first pusher end 1331 that is relatively far away from the body portion 11 and a second pusher end 1332 that is relatively close to the body portion 11, the pusher blade 133 includes a first side 1333 that is far away from the blade portion 131. The first side 1333 includes a curved edge segment 1334 and a straight edge segment 1335 that are connected in succession. The curved edge segment 1334 is located at the second pusher end 1332, and the arc of the curved edge segment 1334 intersects the straight line of the straight edge segment 1335. The aforementioned configuration gives the second push end 1332 of the pusher blade 133 a streamlined profile. The second push end 1332 is relatively closer to the center of rotation, where airflow turbulence is typically stronger and wind resistance is greater. This structural design reduces the wind resistance experienced by the pusher blade 133 during rotation, thereby reducing the load on the impeller 100 to some extent and increasing its rotational speed. Furthermore, because the profile of the second push end 1332 is curved, it can almost completely redirect the airflow impacting the pusher blade 133 outwards from the first push end 1331, roughly along the plane of rotation, thus increasing the airflow of the impeller 100. In summary, the impeller 100 provided in this application can increase the airflow and wind speed of the impeller 100 under the same torque, thereby improving the cooking efficiency of cooking appliances using this impeller 100.

[0048] The following is a detailed introduction to each component of the impeller 100.

[0049] Reference Figure 3 and Figure 4 The impeller 100 is configured to rotate about the axis of rotation O in a specified direction ( Figure 3 Rotating (in the direction of the arrow), the blade portion 131 extends along the plane of rotation of the impeller 100. In this embodiment, the blade portion 131 is generally plate-shaped, and its "extension" or "extending" direction is understood as the direction of the plane on which the plate-shaped blade portion 131 is located.

[0050] Multiple blade sections 131 can be distributed approximately evenly (e.g., at equal intervals) along the circumference of the body section 11, thus when the impeller 100 is applied to the drive motor 24 (see reference 100), the impeller can be used in a way that is suitable for applications such as driving motors 24. Figure 2 When the airflow is more uniform, the manufacturing process of the blade section 131 can be simplified, and the manufacturing difficulty of the blade section 131 can be reduced.

[0051] The blade section 131 includes a connecting portion 1314 and a blade body 1315. The connecting portion 1314 connects the body section 11 and the blade body 1315. To facilitate the manufacturing of the blade section 131, the connecting portion 1314 is integrally formed with both the body section 11 and the blade body 1315. The connecting portions 1314 of two adjacent blade sections 131 can be directly connected and integrally formed, which not only facilitates manufacturing but also ensures the integrity of the impeller 100 and improves the structural strength of the impeller 100. The blade bodies 1315 of two adjacent blade sections 131 are spaced apart to generate airflow when the impeller 100 rotates. It is understood that although the connecting part 1314 and the blade body 1315 are referred to by different names in this application specification to refer to different parts of the blade part 131, these names should not be regarded as a limitation on the structure of the blade part 131. These names are only made for the convenience of description. For example, the connection between the connecting part 1314 and the blade body 1315 can be an integrally formed connection structure, and there may be no obvious dividing line between the connecting part 1314 and the blade body 1315.

[0052] The blade section 131 includes a first blade side 1311 and a second blade side 1312. The first blade side 1311 is located on the windward side of the blade section 131 when rotating, and the second blade side 1312 is located on the leeward side of the blade section 131 when rotating. The first blade side 1311 and the second blade side 1312 are two opposite sides of the blade body 1315. The end of the first blade side 1311 near the body section 11 is connected to the end of the second blade side 1312 of the adjacent blade section 131 near the body section 11. The first blade side 1311 extends in a straight line, and the straight line along which the first blade side 1311 extends does not pass through the rotation center of the body section 11 and is inclined radially relative to the body section 11. Through the above arrangement, the length of the first blade side 1311 can be increased, thereby increasing the length of the windward surface of the blade section 131 when rotating, which can improve the air volume. The second blade side 1312 extends along an arc, and the arc along which the second blade side 1312 extends protrudes toward the first blade side 1311. With the above arrangement, the wind resistance experienced by the blade portion 131 when the impeller 100 rotates can be reduced, thereby increasing the rotational speed of the impeller 100, so as to increase the air volume provided when the impeller 100 rotates.

[0053] The blade portion 131 also includes a third blade side 1313, which is a side of the blade body 1315 away from the body portion 11. The two ends of the third blade side 1313 are connected to the first blade side 1311 and the second blade side 1312, respectively. The distance from the end of the first blade side 1311 away from the body portion 11 along the radial direction to the body portion 11 is greater than the distance from the end of the second blade side 1312 away from the body portion 11 along the radial direction to the body portion 11. The third blade side 1313 extends in a straight line, and the included angle between the third blade side 1313 and the first blade side 1311 can be an acute angle. This configuration not only increases the length of the windward profile of the blade portion 131, thus increasing the effective wind-disrupting length and improving wind-disrupting efficiency, but also further reduces the wind resistance, weight, and load of the blade portion 131 by using an acute angle.

[0054] Reference Figure 4 , Figure 5 and Figure 6 The pusher blade 133 is generally plate-shaped and is connected to the windward side of the blade portion 131. In this embodiment, the pusher blade 133 extends generally along a plane, and the plane containing the pusher blade 133 intersects the rotation plane of the impeller 100; in this embodiment, the two are approximately perpendicular. This arrangement can increase the turbulence efficiency of the pusher blade 133 on the airflow. Furthermore, the pusher blade 133 also includes a second side 1336. The second side 1336 is located between the first pusher end 1331 and the second pusher end 1332. The second side 1336 is connected to the blade portion 131, specifically to the first blade side 1311. The second side 1336 has a first end point 1337 and a second end point 1338. The first endpoint 1337 is located at the first push end 1331, and the second endpoint 1338 is located at the second push end 1332. The push blade 133 extends in a straight line from the second endpoint 1338 to the first endpoint 1337. Therefore, the straight edge segments 1335 of the second side 1336 and the first side 1333 can be approximately parallel to each other, and the curved edge segment 1334, away from the straight edge segment 1335, is connected to the first endpoint 1337. This arrangement not only facilitates the manufacturing of the push blade 133 but also ensures the pushing effect of the push blade 133, thereby increasing the airflow of the impeller 100.

[0055] The pusher blade 133 also includes a third side 1339. The third side 1339 is located at the first pusher end 1331 and connects the first side 1333 and the blade portion 131. Specifically, the two ends of the third side 1339 are respectively connected to the end of the first side 1333 away from the body portion 11 (i.e., the end of the straight edge section 1335 away from the curved edge section 1334) and the end of the second side 1336 away from the body portion 11. The third side 1339 extends in a straight line. With the above arrangement, the wind resistance encountered by the pusher blade 133 when rotating can be further reduced, and the air volume of the pusher blade 133 can be increased.

[0056] The impeller 100 also includes a reinforcing portion 15, which is disposed on the blade portion 131 and located between the first blade side 1311 and the second blade side 1312. The reinforcing portion 15 is used to increase the strength of the blade portion 131 to resist the airflow impact experienced by the impeller 100 during operation. The reinforcing portion 15 extends along the body portion 11 on the blade portion 131 in a direction away from the body portion 11. The reinforcing portion 15 has a first reinforcing end 151 close to the body portion 11 and a second reinforcing end 152 away from the body portion 11. The width of the second reinforcing end 152 is smaller than the width of the first reinforcing end 151. Specifically, the reinforcing portion 15 extends from the connecting portion 1314 to the blade body 1315, that is, the first reinforcing end 151 is located on the connecting portion 1314, and the second reinforcing end 152 is located on the blade body 1315. With the above configuration, the reinforcing part 15 can effectively improve the strength of the blade part 131 and the body part 11. Therefore, when the impeller 100 is subjected to airflow impact during operation, the reinforcing part 15 can prevent the blade part 131 and the body part 11 from deforming to a certain extent, thereby protecting the impeller 100.

[0057] Furthermore, the reinforcing portion 15 includes a first reinforcing edge 153 and a second reinforcing edge 154. The first reinforcing edge 153 is spaced apart from the first blade side 1311. The second reinforcing edge 154 is spaced apart from the second blade side 1312. The second reinforcing edge 154 extends along a designated arc, which protrudes towards the first blade side 1311. The curvature of the second reinforcing edge 154 is approximately the same as the curvature of the second blade side 1312. Through the above arrangement, it can be ensured that the curvature trend of the reinforcing portion 15 is approximately the same as the curvature trend of the second blade side 1312, thereby allowing the reinforcing portion 15 to better adapt to the shape of the blade portion 131. While ensuring the overall reinforcement of the blade portion 131, the wind resistance of the reinforcing portion 15 is reduced, thereby achieving the effect of increasing the rotational speed and airflow of the impeller 100.

[0058] In this embodiment, the reinforcing part 15 is a groove formed by stamping on the blade part 131 (the reinforcing part 15 protrudes towards the side closer to the pusher blade 133 relative to the blade part 131), which has the advantages of being lightweight and having a good reinforcing effect. In other embodiments, the reinforcing part 15 can also be a rib formed by stamping on the blade part 131 (the reinforcing part 15 protrudes away from the pusher blade 133 relative to the blade part 131), or the reinforcing part 15 can be a reinforcing rib welded to the blade part 131.

[0059] In some embodiments of this application, certain limitations are imposed on the dimensions of various parts of the impeller 100 to ensure that the impeller 100 has a relatively large air volume under low load conditions, as detailed below.

[0060] Reference Figure 7 , Figure 8 and Figure 9 The first endpoint 1337 (i.e., the farthest point of the fan blade 13 along the radial direction of the body portion 11 to the body portion 11) is arranged on the outer reference circle 16, with the rotation center of the body portion 11 (i.e., the rotation axis O) as the center. The outer reference circle 16 can be understood as a circle formed by connecting each of the first endpoints 1337 in sequence by circular arcs.

[0061] Reference Figure 10 The angle between the tangent at the first endpoint 1337 of the outer reference circle 16 and the extension of the second side 1336 is the blade outlet installation angle β1, which satisfies the relationship: 67°≤β1≤78°. When the angle β1 is less than 67°, the deflection angle of the second side 1336 relative to the rotation center of the impeller 100 is too small, thus increasing the load on the fan blade 13 and reducing the airflow. When the angle β1 is greater than 78°, the deflection angle of the second side 1336 relative to the rotation center of the impeller 100 is too large, which also increases the load on the fan blade 13 and reduces the airflow. In this embodiment, the angle β1 is set in the range of 67°~78° (inclusive of the endpoint), which ensures that the offset angle of the fan blade 13 relative to the rotation center of the impeller 100 is within a relatively optimal range, thereby keeping the airflow and wind speed of the impeller 100 within a relatively optimal range.

[0062] Optionally, β1 can be 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, etc. Of course, β1 can also be other values ​​between 67° and 78° (including the endpoints), which will not be listed here.

[0063] Reference Figure 10The second endpoint 1338 (i.e., the closest point of the pusher blade 133 to the body 11 along the radial direction of the body 11) is arranged on the inner reference circle 17, with the rotation center of the body 11 (i.e., the shaft O) as its center. The inner reference circle 17 can be understood as a circle formed by connecting the various second endpoints 1338 in sequence by circular arcs. The angle between the tangent of the inner reference circle 17 at the second endpoint 1338 and the second side 1336 is the blade inlet installation angle β2, which satisfies the relationship: 48°≤β2≤65°. When the above-mentioned angle β2 is less than 48°, the deflection angle of the second side 1336 relative to the rotation center of the impeller 100 is too small, thus increasing the load on the fan blade 13 and reducing the air volume; when the above-mentioned angle β2 is greater than 65°, the deflection angle of the second side 1336 relative to the rotation center of the impeller 100 is too large, which also increases the load on the fan blade 13 and reduces the air volume. In this embodiment, the included angle β2 is set in the range of 48° to 65° (inclusive), which can ensure that the offset angle of the fan blade 13 relative to the rotation center of the impeller 100 is within a relatively good range, thereby keeping the air volume and wind speed of the impeller 100 within a relatively good range.

[0064] Optionally, β2 can be 49°, 51°, 53°, 55°, 57°, 59°, 61°, 63°, 65°, etc. Of course, β2 can also be other values ​​between 48° and 65° (including the endpoints), which will not be listed here.

[0065] Reference Figure 8 and Figure 9 The outer diameter of the impeller 100 is D, which can be understood as the diameter of the outer reference circle 16. The length of the second side 1336 is L1, and D and L1 satisfy the relationship: 0.21≤L1 / D≤0.32. When the value of L1 / D is less than 0.21, the length of the pusher blade 133 relative to the impeller 100 is too small, which will cause the pusher blade 133 to fail to achieve the ideal pushing effect; when the value of L1 / D is greater than 0.32, the length of the pusher blade 133 relative to the impeller 100 is too large, which will increase the load on the impeller 100 and reduce the speed of the impeller 100. Therefore, in this embodiment, the range of L1 / D is set between 0.21 and 0.32 (inclusive). Through the above parameter setting, it is possible to ensure that the pushing effect of the pusher blade 133 is relatively good without causing the load on the impeller 100 to be too large.

[0066] Optionally, L1 / D can be 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, etc. Of course, L1 / D can also be other values ​​between 0.21 and 0.32 (inclusive of the endpoints), which will not be listed here.

[0067] The length of the third side 1339 is h1 (see...) Figure 5 and Figure 9 The values ​​of h1 and L1 (length of the second side 1336) satisfy the following relationship: 0.38 ≤ h1 / L1 ≤ 0.51. When the value of h1 / L1 is less than 0.38, the pushing effect of the pusher blade 133 will be reduced due to the small width-to-length ratio of the pusher blade 133; when the value of h1 / L1 is greater than 0.51, the pushing effect of the pusher blade 133 will also be reduced due to the large width-to-length ratio of the pusher blade 133. Therefore, in this embodiment, the range of h1 / L1 is set between 0.38 and 0.51 (inclusive). By setting the above parameters, the pushing effect of the pusher blade 133 can be ensured to be within a relatively good range.

[0068] Optionally, h1 / L1 can be 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, etc. Of course, h1 / L1 can also be other values ​​between 0.38 and 0.51 (inclusive of the endpoints), which will not be listed here.

[0069] The arc along which the curved edge segment 1334 is located is a circular arc, and the radius of the circular arc along which the curved edge segment 1334 is located is R (see...). Figure 5 and Figure 9 R and L1 (the length of the second side 1336) satisfy the relationship: 0.62 ≤ R / L1 ≤ 0.83. When the value of R / L1 is less than 0.62, the length of the curved section 1334 is too short, and the pusher blade 133 cannot achieve the ideal load reduction effect; when the value of R / L1 is greater than 0.83, the length of the curved section 1334 is too long, and the pusher blade 133 also cannot achieve the ideal load reduction effect. Therefore, in this embodiment, the range of R / L1 is set between 0.62 and 0.83 (inclusive). Through the above parameter setting, it can be ensured that the effect of the pusher blade 133 in reducing the load of the impeller 100 is within a relatively good range.

[0070] Optionally, R / L1 can be 0.63, 0.65, 0.67, 0.69, 0.71, 0.73, 0.75, 0.77, 0.79, 0.81, etc. Of course, R / L1 can also be other values ​​between 0.62 and 0.83 (inclusive of the endpoints), which will not be listed here.

[0071] The central angle Q of the arc along which the curved segment 1334 is located (see...) Figure 5 and Figure 9The following relationship must be satisfied: 55°≤Q≤82°. When Q is less than 55° or greater than 82°, the curved edge segment 1334 cannot form an ideal streamlined profile with the first side edge 1333, which will reduce the pushing effect of the pusher blade 133 and increase the load on the impeller 100. Therefore, in this embodiment, the range of Q is set between 55° and 82° (including the endpoint). By setting the above parameters, the pushing effect of the pusher blade 133 can be guaranteed and the air volume of the impeller 100 can be increased. At the same time, the load of the pusher blade 133 on the impeller 100 can be reduced, making the impeller 100 safer, more stable and reliable when it is working.

[0072] Optionally, the value of Q can be 55°, 60°, 65°, 70°, 75°, 80°, etc. Of course, Q can also be other values ​​between 55° and 82° (inclusive of the endpoints), which will not be listed here.

[0073] The height of the propeller blade 133 is h (see Figure 11 The height h of the pusher blade 133 should be understood as the farthest vertical distance from the first side 1333 to the blade portion 131. h and D (the outer diameter of the impeller 100) satisfy the relationship: 0.08 ≤ h / D ≤ 0.14. When the value of h / D is less than 0.08, the height of the pusher blade 133 is too small relative to the outer diameter of the impeller 100, thus increasing the load on the pusher blade 133 and reducing the airflow. When the value of h / D is greater than 0.14, the height of the pusher blade 133 is too large relative to the outer diameter of the impeller 100, similarly increasing the load on the pusher blade 133 and reducing the airflow. Therefore, in this embodiment, the range of h / D is set between 0.08 and 0.14 (inclusive). Through the above parameter setting, the effect of the pusher blade 133 in reducing the load on the impeller 100 and increasing the airflow is ensured to be within a relatively optimal range.

[0074] Optionally, the value of h / D can be 0.09, 0.10, 0.11, 0.12, 0.13, etc. Of course, h / D can also be other values ​​between 0.08 and 0.14 (inclusive of the endpoints), which will not be listed here.

[0075] In summary, by setting the above parameters, the impeller 100 can increase its air volume and speed under low load, thereby improving the cooking efficiency and shortening the cooking time of cooking appliances using the impeller 100.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," 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 this application. 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.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An impeller, characterized by, include: The impeller includes a main body and multiple fan blades, the main body being adapted to connect to a shaft for driving the impeller; Multiple fan blades are arranged sequentially at intervals around the body and are respectively connected to the body; the fan blades include: The blade portion is connected to the body portion and extends along the plane of rotation of the impeller; as well as A pusher blade is connected to and bent relative to the blade portion, the bending direction of the pusher blade relative to the blade portion intersecting the plane of rotation; the pusher blade has a first pusher end relatively far from the body portion and a second pusher end relatively close to the body portion; the pusher blade includes a first side away from the blade portion and a second side connected to the blade portion, the first side is located between the first pusher end and the second pusher end, the first side includes a curved edge segment and a straight edge segment connected in succession, the curved edge segment is located at the second pusher end, the arc of the curved edge segment intersects the straight line of the straight edge segment; the arc of the curved edge segment is a circular arc, the central angle of the circular arc is Q, Q satisfies the relationship: 55°≤Q≤82°; the length of the second side is L1, the radius of the circular arc is R, R and L1 satisfy the relationship: 0.62≤R / L1≤0.

83.

2. The impeller of claim 1, wherein The second side has a first end point located at the first push end and a second end point located at the second push end; the push blade extends in a straight line in the direction from the second end point to the first end point.

3. The impeller of claim 2, wherein The first endpoint is arranged on an outer reference circle centered on the axis of the rotating shaft. The angle β1 between the tangent of the outer reference circle at the first endpoint and the extension of the second side satisfies the following relationship: 67°≤β1≤78°.

4. The impeller of claim 2 wherein, The second endpoint is arranged on an inner reference circle centered on the axis of the rotating shaft. The angle β2 between the tangent of the inner reference circle at the second endpoint and the second side satisfies the following relationship: 48°≤β2≤65°.

5. The impeller of claim 2 wherein, The outer diameter of the impeller is D, and the length of the second side is L1. D and L1 satisfy the relationship: 0.21≤L1 / D≤0.

32.

6. The impeller of claim 2 wherein, The pusher blade also includes a third side, which is located at the first pusher end and connects the straight edge section and the blade portion. The third side extends along a straight line.

7. The impeller of claim 6 wherein, The length of the second side is L1, and the length of the third side is h1. h1 and L1 satisfy the relationship: 0.38≤h1 / L1≤0.

51.

8. The impeller of claim 7, wherein The outer diameter of the impeller is D, and the height of the pusher blade is h. h and D satisfy the relationship: 0.08≤h / D≤0.

14.

9. The impeller of any one of claims 1 to 8, wherein The number of wind turbine blades is Z, and Z satisfies the relationship: 9≤Z≤11.

10. The impeller according to any one of claims 1 to 8, characterized in that, The impeller is configured to rotate about the axis of rotation in a specified direction; the pusher blades are connected to the windward side of the blade section when rotating.

11. The impeller as claimed in claim 10, characterized in that, The straight edge segment and the curved edge segment are tangent.

12. The impeller of any one of claims 1 to 8, wherein The impeller also includes a reinforcing portion disposed on the blade portion. The reinforcing portion extends along the body portion away from the body portion on the blade portion. The reinforcing portion is a groove or rib formed on the blade portion.

13. A cooking appliance characterized by, It includes a main unit and an impeller as described in any one of claims 1 to 12, wherein the impeller is rotatably disposed within the main unit.

Images