Impeller and cooking utensil

Abstract

The invention relates to the technical field of kitchen appliances, in particular to an impeller and a cooking utensil, the impeller comprises a body part and a plurality of fan blades, and the body part is suitable for being connected with a rotating shaft used for driving the impeller; the multiple fan blades are sequentially arranged at intervals around the body part and connected to the body part. The multiple fan blades comprise blade parts and wind pushing blades, and the blade parts are connected to the body part and extend along the rotation plane of the impeller. The wind pushing blade is connected to the blade part and is bent relative to the blade part, and the bending direction of the wind pushing blade relative to the blade part is intersected with the rotation plane; the air pushing blade is provided with a first air pushing end relatively far away from the body part and a second air pushing end relatively close to the body part. The wind pushing blade comprises a first side edge away from the blade part, the first side edge comprises a curved edge section and a straight edge section which are continuously connected, and an arc line where the curved edge section is located intersects with a straight line where the straight edge section is located. The air volume of the impeller is relatively large.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen appliances, and in particular to an impeller and a cooking utensil. Background Art

[0002] When air cooking appliances such as air fryers and ovens are working, hot air penetrates the food, takes away the moisture in the food and cooks the food. Therefore, the cooking effect is mainly affected by the speed and direction of the airflow. The direction of the airflow is mainly guided by the air duct, and the speed of the airflow is mainly affected by the performance of the impeller. In the past, many researchers focused their main efforts on the optimization of the air duct, and few studied the impeller. However, the cooking effect of air cooking appliances is not only affected by the air duct, but also by the impeller. At present, the impellers on the market usually only consider the simplicity of processing and manufacturing, and ignore the design of the impeller structure, which results in the impeller's weak working capacity and small air volume, thereby reducing the cooking efficiency of the cooking appliance using the impeller. Summary of the invention

[0003] The present application provides an impeller and also provides a cooking utensil.

[0004] In the first aspect, the present application provides an impeller, which includes a main body and a plurality of blades; the main body is suitable for connecting to a rotating shaft for driving the impeller; the plurality of blades are arranged in sequence around the main body and are respectively connected to the main body; the plurality of blades include a blade portion and a push-air blade; the blade portion is connected to the main body, and the blade portion is extended along the rotation plane of the impeller; the push-air blade is connected to the blade portion and bent relative to the blade portion, and the bending direction of the push-air blade relative to the blade portion intersects with the rotation plane; the push-air blade has a first push-air end relatively away from the main body and a second push-air end relatively close to the main body; the push-air blade includes a first side away from the blade portion, the first side is located between the first push-air end and the second push-air end, the first side includes a curved edge section and a straight edge section connected in series, the curved edge section is located at the second push-air end, and the arc line where the curved edge section is located intersects with the straight line where the straight edge section is located.

[0005] Optionally, in some embodiments, the air pushing blade also includes a second side edge connected to the blade portion, the second side edge having a first endpoint located at the first air pushing end and a second endpoint located at the second air pushing end; the air pushing blade extends in a straight line in the direction from the second endpoint to the first endpoint.

[0006] Optionally, in some embodiments, the first endpoint is arranged on an outer reference circle with the axis of the rotating shaft as the center, and the angle β1 between the tangent line of the outer reference circle at the first endpoint and the extension line of the second side meets the relationship: 67°≤β1≤78°.

[0007] Optionally, in some embodiments, the second endpoint is arranged on an inner reference circle with the axis of the rotating shaft as the center, and an angle β2 between a tangent line of the inner reference circle at the second endpoint and the second side edge satisfies the relationship: 48°≤β2≤65°.

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

[0009] Optionally, in some embodiments, the air-pushing blade further includes a third side edge, the third side edge is located at the first air-pushing end and is connected between the straight side segment and the blade portion, and the third side edge extends along a straight line.

[0010] Optionally, in some embodiments, the length of the second side is L1, the length of the third side is h1, and 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, the height of the air-pushing blade is h, and 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 line where the curved side 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 line where the curved edge segment is located is a circular arc, the center angle of the circular arc is Q, and Q satisfies the relationship: 55°≤Q≤82°.

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

[0015] Optionally, the impeller is configured to rotate around the rotation axis in a specified direction; the air-pushing blade is connected to the windward side of the blade portion when it rotates.

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

[0017] Optionally, the impeller further includes a reinforcement portion, which is arranged on the blade portion, and the reinforcement portion extends on the blade portion along the main body portion in a direction away from the main body portion, and the reinforcement portion is a groove or a convex rib formed on the upper portion of the blade.

[0018] In a second aspect, the present application further provides a cooking utensil, comprising a main unit and the impeller, wherein the impeller is rotatably disposed in the main unit.

[0019] In the impeller provided by the present application, since the pusher blades are arranged on the blade portion, the pusher blades are bent relative to the blade portion, and the bending direction intersects with the rotating plane, when the impeller rotates, it can not only disturb the airflow on the rotating plane, but also disturb the airflow in the bending direction of the pusher blades (for example, in a direction perpendicular to the rotating plane). Therefore, the overall disturbance efficiency of the impeller on the airflow is relatively high, thereby being able to increase the air volume of the impeller.

[0020] Furthermore, the air-pushing blade has a first air-pushing end relatively far from the main body and a second air-pushing end relatively close to the main body, the air-pushing blade includes a first side away from the blade, the first side includes a curved side section and a straight side section connected in succession, the curved side section is located at the second air-pushing end, and the arc line where the curved side section is located intersects with the straight line where the straight side section is located. The above arrangement enables the second air-pushing end of the air-pushing blade to have a streamlined contour line, and the second air-pushing end is relatively closer to the center of rotation, and the air flow disturbance at the center of rotation is usually relatively stronger and the wind resistance is greater. This structural design can reduce the wind resistance encountered by the air-pushing blade when it rotates, thereby reducing the load of the impeller to a certain extent, so as to achieve the effect of increasing the rotation speed of the impeller; in addition, since the contour line of the second air-pushing end is a curve, it can also almost completely throw the airflow that hits the air-pushing blade outward from the first air-pushing end roughly along the rotation plane, so as to achieve the effect of increasing the air volume of the impeller. In summary, the impeller provided in the present application can increase the air volume and wind speed of the impeller under the condition of the same torque, thereby improving the cooking efficiency of the cooking appliance using the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

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

[0025] Figure 4 yes Figure 3 An enlarged view of the local structure of the impeller.

[0026] Figure 5 yes Figure 4 Schematic diagram of the characteristic dimensions of the pusher blades in FIG.

[0027] Figure 6 yes Figure 3 Top view of the impeller in .

[0028] Figure 7 yes Figure 6 Bottom view of the impeller in.

[0029] Figure 8 yes Figure 7 Schematic diagram of the characteristic dimensions of the impeller in .

[0030] Fig. 9 yes Figure 8 A partial enlarged view of the impeller.

[0031] Fig.10 yes Figure 8 Schematic diagram of the characteristic dimensions of the impeller in .

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

[0033] Explanation of reference numerals: 100, impeller; 11, main body; 13, fan blade; 131, blade portion; 1311, first blade side; 1312, second blade side; 1313, third blade side; 1314, connecting portion; 1315, blade body; 133, air-pushing blade; 1331, first air-pushing end; 1332, second air-pushing end; 1333, first side; 1334, curved edge section; 1335, straight edge section ; 1336, second side; 1337, first endpoint; 1338, second endpoint; 1339, third side; 15, reinforcement part; 151, first reinforcement end; 152, second reinforcement end; 153, first reinforcement edge; 154, second reinforcement 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 DESCRIPTION

[0034] In order 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 in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all examples. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only used to simplify the description of the present application and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0036] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In addition, unless otherwise expressly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use differences in names as a way to distinguish components, but use differences in components' functions as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0039] Reference Figure 1 and Figure 2 The present application provides an impeller 100 and a cooking utensil 200 using the impeller 100. The cooking utensil 200 may be a kitchen utensil with a baking function, which can use heat to fry food. When it is working, the cooking utensil 200 can generate hot air through the heating tube in the pot, and then use the fan to blow the high-temperature air into the pot to heat the food, so that the hot air can circulate in the pot, thereby dehydrating the food to achieve the effect of frying food. Specifically, the cooking utensil 200 may be an air fryer, an air oven, an air microwave oven, etc., and this specification takes an air fryer as an example for explanation.

[0040] In this embodiment, the cooking utensil 200 may include a main unit 21, a pot body 22, and the above-mentioned impeller 100. The main unit 21 is provided with a receiving cavity, and the pot body 22 and the impeller 100 are both arranged in the receiving cavity. The cooking utensil 200 may be a pull-out air fryer, a flip-top air fryer, or a box-type air fryer. For example, in this embodiment, a pull-out air fryer is taken as an example, and the pot body 22 has a handle 23. The user can install the pot body 22 in the main unit 21 or take the pot body 22 out of the main unit 21 by holding the handle 23. A cooking space 25 is formed inside the pot body 22, and the cooking space 25 is an area of ​​the cooking utensil 200 for holding food and cooking food.

[0041] An air duct module, a control module, a heating module, etc. can be provided in the host 21. The control module can be used to control the operation of the driving device of the driving motor 24, and can also be used to drive the heating module to work. The host 21 includes a shell and a driving motor 24. The shell forms a receiving cavity for accommodating the pot body 22. The driving motor 24 is arranged in the shell, and the output shaft of the driving motor 24 is arranged toward the receiving cavity. The impeller 100 is connected to the output shaft of the driving motor 24, and the two together constitute a centrifugal fan. One side of the impeller 100 faces the cooking space 25. In this way, when the driving motor 24 is working, the impeller 100 rotates, and a negative pressure is formed on the side of the impeller 100 facing the cooking space 25, so that the hot air in the cooking space 25 can flow axially toward the impeller 100, and further flow out radially along the impeller 100, and then enter the cooking space 25. When the impeller 100 continues to rotate, the circulation of hot air between the cooking space 25 and the impeller 100 can be realized (refer to Figure 2 The path shown by the arrow in the middle is for reference only and does not limit the air flow mode. When the hot air flows through the food in the cooking space 25, it can take away moisture from the food and cook the food. Through the above configuration, the impeller 100 can increase the air volume of the air fryer and can withstand the increased load due to the increase in air volume, thereby improving the cooking efficiency of the air fryer and making it safe and reliable.

[0042] Reference Figure 3 , Figure 4 and Figure 5The impeller 100 includes a body 11 and a plurality of blades 13. The body 11 is the main part of the impeller 100, which is approximately located at the center of the impeller 100. The body 11 is suitable for connecting a rotating shaft for driving the impeller 100 to rotate. The rotating shaft can be an output shaft of a driving device (such as the above-mentioned driving motor 24), which is used to drive the impeller 100 to rotate and generate airflow. When the body 11 rotates under the drive of the driving motor 24, it has a rotation axis O, which is the axis of the output shaft of the driving motor 24. Therefore, relatively speaking, the body 11 also has a radial direction, which is a straight line direction perpendicular to the rotation axis O. As an example, the main body 11 in this specification is explained as a roughly circular plate shape. The "radial direction", "rotation axis" or "rotation axis" of the main body 11 mentioned below can be correspondingly understood as the direction of the radial direction and the rotation axis O of the main body 11 here; similarly, the "circumferential direction" of the main body 11 mentioned below should be understood as the direction of the outer circumference of the main body 11 here; the "rotation plane" mentioned below is understood as the plane on which the impeller 100 rotates, which is perpendicular to the rotation axis O.

[0043] A plurality of fan blades 13 surround the main body 11, are arranged in sequence at intervals along the circumference of the main body 11, and are respectively connected to the main body 11. The plurality of fan blades 13 are arranged on the radially outer side of the main body 11, and extend radially outward relative to the main body 11. The fan blades 13 are used to guide the airflow to flow along the radial direction of the impeller 100, so that the impeller 100 becomes a centrifugal impeller, and also makes the pressure on the axial side of the impeller 100 become negative pressure. When the impeller 100 is applied to the cooking utensil 200, the negative pressure side of the impeller 100 is directed toward the food in the cooking space 25 of the cooking utensil 200, so that the hot air in the cooking space 25 can flow axially toward the impeller 100, and further flow out radially from the impeller 100, and then enter the cooking space 25. When the impeller 100 continues to rotate, the circulation of air between the cooking space 25 and the impeller 100 can be realized (refer to Figure 2 The path shown by the arrow in the middle is for reference only and does not limit the air flow mode.) When the hot air flows through the food in the cooking space 25, it can take away moisture in the food and cook the food.

[0044] In this embodiment, the fan blades 13 are integrally formed with the main body 11, for example, by stamping. The number of the fan blades 13 is 11. In other embodiments, the fan blades 13 may also be welded, bonded, or fixedly connected to the main body 11 by bolts, and the number of the fan blades 13 may be any integer not less than 9 and not greater than 11, for example, 9 or 10. By limiting the number of the fan blades 13 within the above range, it can be ensured that the wind volume and wind speed of the fan blades 13 are within a relatively good range.

[0045] In this embodiment, the structure of each fan blade 13 is completely the same, and each fan blade 13 includes a blade portion 131 and a push blade 133. In other embodiments, the structures of multiple fan blades 13 may not be completely the same, for example, a part of the fan blades 13 have the same structure, and the fan blades 13 with the same structure include a blade portion 131 and a push blade 133. One end of the blade portion 131 is connected to the main body 11, and the other end extends in the radial direction of the main body 11 in a direction away from the main body 11. The blade portion 131 is extended along the rotation plane of the impeller 100, and is used to rotate with the main body 11 to generate airflow. The push blade 133 is connected to the blade portion 131 and is bent relative to the blade portion 131. It is used to rotate with the blade portion 131 and increase the air volume of the impeller 100. The bending direction of the push blade 133 relative to the blade portion 131 intersects with the rotation plane of the impeller 100, and the angle between the two can range from 90° to 150° (including the end points). The air pushing blade 133 has a first air pushing end 1331 relatively far from the main body 11 and a second air pushing end 1332 relatively close to the main body 11. The air pushing blade 133 includes a first side 1333 far from the main body 131, and the first side 1333 is located between the first air pushing end 1331 and the second air pushing end 1332. The first side 1333 includes a curved side section 1334 and a straight side section 1335 connected in series, the curved side section 1334 is located at the second air pushing end 1332, the curved side section 1334 extends along an arc line and protrudes in a direction away from the blade portion 131, and the straight side section 1335 extends along a straight line, and the arc line where the curved side section 1334 is located intersects with the straight line where the straight side section 1335 is located. In this embodiment, the arc line 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 line 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] Through the above-mentioned arrangement, since the pusher blades 133 are provided on the blade portion 131, the pusher blades 133 are bent relative to the blade portion 131, and the bending direction intersects with the rotation plane, when the impeller 100 rotates, it can not only disturb the airflow on the rotation plane, but also disturb the airflow in the bending direction of the pusher blades 133 (for example, in a direction perpendicular to the rotation plane). Therefore, the overall disturbance efficiency of the impeller 100 on the airflow is relatively high, thereby being able to increase the air volume of the impeller 100.

[0047] Furthermore, since the air pushing blade 133 has a first air pushing end 1331 relatively away from the main body 11 and a second air pushing end 1332 relatively close to the main body 11, the air pushing blade 133 includes a first side edge 1333 away from the blade portion 131, the first side edge 1333 includes a curved edge segment 1334 and a straight edge segment 1335 connected in succession, the curved edge segment 1334 is located at the second air pushing end 1332, and the arc line where the curved edge segment 1334 is located intersects with the straight line where the straight edge segment 1335 is located. The above arrangement enables the second air-pushing end 1332 of the air-pushing blade 133 to have a streamlined contour line. The second air-pushing end 1332 is relatively closer to the center of rotation. Usually, the air flow disturbance at the center of rotation is relatively stronger and the wind resistance is greater. This structural design can reduce the wind resistance encountered by the air-pushing blade 133 when it rotates, thereby reducing the load of the impeller 100 to a certain extent, so as to achieve the effect of increasing the rotation speed of the impeller 100. In addition, since the contour line of the second air-pushing end 1332 is a curve, it can also almost completely throw the airflow that hits the air-pushing blade 133 outward from the first air-pushing end 1331 roughly along the rotation plane, so as to achieve the effect of increasing the air volume of the impeller 100. In summary, the impeller 100 provided in the present application can increase the air volume and wind speed of the impeller 100 under the same torque, thereby improving the cooking efficiency of the cooking appliance using the impeller 100.

[0048] The various components of the impeller 100 are described in detail below.

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

[0050] The plurality of blade portions 131 may be substantially evenly distributed (eg, evenly spaced) along the circumference of the body portion 11, so that when the impeller 100 is applied to the drive motor 24 (see Figure 2 ), the generated airflow is more uniform, and at the same time, the manufacturing process of the blade portion 131 can be simplified, reducing the difficulty of manufacturing the blade portion 131.

[0051] The blade portion 131 includes a connecting portion 1314 and a blade body 1315. The connecting portion 1314 is connected between the main body 11 and the blade body 1315. In order to facilitate the processing and manufacturing of the blade portion 131, the connecting portion 1314, the main body 11 and the blade body 1315 are all integrally formed. The connecting portions 1314 of two adjacent blade portions 131 can be directly connected and integrally formed, which not only facilitates processing and 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 portions 131 are arranged at intervals to generate airflow when the impeller 100 rotates. It can be understood that in the present application specification, although the connecting portion 1314 and the blade body 1315 use different names to refer to different parts of the blade portion 131, these names should not be regarded as limitations on the structure of the blade portion 131. These names are only made for the convenience of description. For example, the connection between the connecting portion 1314 and the blade body 1315 can be an integrally formed connection structure, and there may be no obvious dividing line between the connecting portion 1314 and the blade body 1315.

[0052] The blade portion 131 includes a first blade side 1311 and a second blade side 1312, wherein the first blade side 1311 is located on the windward side of the blade portion 131 when rotating, and the second blade side 1312 is located on the leeward side of the blade portion 131 when rotating. The first blade side 1311 and the second blade side 1312 are two opposite sides of the blade body 1315. One end of the first blade side 1311 close to the body portion 11 is connected to one end of the second blade side 1312 of the adjacent blade portion 131 close to the body portion 11. The first blade side 1311 extends along 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 portion 11 and is inclined relative to the radial direction of the body portion 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 portion 131 when rotating, thereby achieving the effect of increasing the air volume. The second blade side 1312 extends along an arc line, and the arc line along which the second blade side 1312 extends protrudes toward the first blade side 1311. Through the above arrangement, the wind resistance of the blade portion 131 when the impeller 100 rotates can be reduced, thereby increasing the rotation speed of the impeller 100, so as to achieve the purpose of increasing the air volume provided by the impeller 100 when it 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 main body 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, and the distance from the end of the first blade side 1311 away from the main body 11 to the main body 11 along the radial direction of the main body 11 is greater than the distance from the end of the second blade side 1312 away from the main body 11 to the main body 11 along the radial direction of the main body 11. The third blade side 1313 extends along a straight line, wherein the angle between the third blade side 1313 and the first blade side 1311 can be an acute angle. Through the above arrangement, not only can the contour line length of the windward side of the blade portion 131 be increased, that is, the effective wind disturbance length can be increased and the wind disturbance efficiency can be improved, but also the setting of the acute angle can further reduce the wind resistance of the blade portion 131, reduce the weight, and reduce the load.

[0054] Reference Figure 4 , Figure 5 and Figure 6 , the air-pushing blade 133 is roughly plate-shaped, and is connected to the windward side of the blade portion 131. In the present embodiment, the air-pushing blade 133 is arranged to extend roughly along a plane, and the plane where the air-pushing blade 133 is located intersects with the rotation plane of the impeller 100, and in the present embodiment, the two are roughly perpendicular. The above arrangement can increase the disturbance efficiency of the airflow by the air-pushing blade 133. Furthermore, the air-pushing blade 133 also includes a second side 1336. The second side 1336 is located between the first air-pushing end 1331 and the second air-pushing end 1332. The second side 1336 is connected to the blade portion 131, specifically connected to the first blade side 1311. The second side 1336 has a first endpoint 1337 and a second endpoint 1338. The first end point 1337 is located at the first air-pushing end 1331, the second end point 1338 is located at the second air-pushing end 1332, and the air-pushing blade 133 extends in a straight line from the second end point 1338 to the first end point 1337, so the second side 1336 and the straight side section 1335 of the first side 1333 can be substantially parallel to each other, and one end of the curved side section 1334 away from the straight side section 1335 is connected to the first end point 1337. Through the above arrangement, not only is it convenient to manufacture the air-pushing blade 133, but also the air-pushing effect of the air-pushing blade 133 can be ensured, thereby achieving the purpose of increasing the air volume of the impeller 100.

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

[0056] The impeller 100 further includes a reinforcing portion 15, which is disposed on the blade portion 131 and is located between the first blade side edge 1311 and the second blade side edge 1312, and is used to increase the strength of the blade portion 131 to resist the airflow impact suffered by the impeller 100 during operation. The reinforcing portion 15 extends on the blade portion 131 along the main body portion 11 in a direction away from the main body portion 11, and the reinforcing portion 15 has a first reinforcing end 151 close to the main body portion 11 and a second reinforcing end 152 away from the main body portion 11, and 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. Through the above arrangement, the reinforcement portion 15 can effectively improve the strength of the blade portion 131 and the main body portion 11. Therefore, when the impeller 100 is impacted by airflow during operation, the reinforcement portion 15 can prevent the blade portion 131 and the main body portion 11 from deforming to a certain extent, thereby protecting the impeller 100.

[0057] Further, the reinforcement portion 15 includes a first reinforcement edge 153 and a second reinforcement edge 154. The first reinforcement edge 153 is arranged at a relative interval with the first blade side 1311. The second reinforcement edge 154 is arranged at a relative interval with the second blade side 1312. The second reinforcement edge 154 extends along a specified arc, and the specified arc protrudes toward the first blade side 1311. The curvature of the second reinforcement edge 154 is substantially the same as the curvature of the second blade side 1312. Through the above arrangement, it is possible to ensure that the bending trend of the reinforcement portion 15 is substantially the same as the bending trend of the second blade side 1312, so that the reinforcement portion 15 can better adapt to the shape of the blade portion 131, and while ensuring that the blade portion 131 is strengthened as a whole, the wind resistance of the reinforcement portion 15 is reduced, so as to achieve the effect of increasing the rotation speed and air volume of the impeller 100.

[0058] In this embodiment, the reinforcing portion 15 is a groove formed by stamping on the blade portion 131 (the reinforcing portion 15 protrudes relative to the blade portion 131 toward the side close to the air-pushing blade 133), which has the advantages of light weight and good reinforcing effect. In other embodiments, the reinforcing portion 15 can also be a convex rib formed by stamping on the blade portion 131 (the reinforcing portion 15 protrudes relative to the blade portion 131 toward the side away from the air-pushing blade 133), and the reinforcing portion 15 can also be a reinforcing rib welded to the blade portion 131.

[0059] In some embodiments of the present application, certain restrictions are imposed on the size of various parts of the impeller 100 to ensure that the impeller 100 has a relatively large air volume under a relatively low load, as described in detail below.

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

[0061] Reference Fig.10 , the angle between the tangent of the outer reference circle 16 at the first end point 1337 and the extension line of the second side 1336 is the blade outlet installation angle β1, β1 satisfies the relationship: 67°≤β1≤78°. When the above 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, which will increase the load of the fan blade 13 and reduce the air volume; when the above 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 will also increase the load of the fan blade 13 and reduce the air volume. In this embodiment, the range of the angle β1 is set at 67°~78° (including the end points), 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, so that the air volume and wind speed of the impeller 100 are within a relatively good 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 are not listed here one by one.

[0063] Reference Fig.10, the second endpoint 1338 (i.e., the closest point of the air-pushing blade 133 to the main body 11 along the radial direction of the main body 11) is arranged on the inner reference circle 17, and the inner reference circle 17 takes the rotation center of the main body 11 (i.e., the rotation axis O) as the center. The inner reference circle 17 can be understood as a circle formed by connecting the second endpoints 1338 in sequence. 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, and β2 satisfies the relationship: 48°≤β2≤65°. When the above-mentioned angle β2 is less than 48°, since the deflection angle of the second side 1336 relative to the rotation center of the impeller 100 is too small, the load of the fan blade 13 will be increased and the air volume will be reduced; when the above-mentioned angle β2 is greater than 65°, since the deflection angle of the second side 1336 relative to the rotation center of the impeller 100 is too large, the load of the fan blade 13 will also be increased and the air volume will be reduced. In this embodiment, the range of the angle β2 is set at 48° to 65° (including the end points), 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 optimal range, so that the wind volume and wind speed of the impeller 100 are within a relatively optimal 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 are not listed here one by one.

[0065] Reference Figure 8 and Fig. 9 , the outer diameter of the impeller 100 is D, and the outer diameter of the impeller 100 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 air-pushing blade 133 relative to the impeller 100 is too small, which will cause the air-pushing blade 133 to fail to achieve an ideal air-pushing effect; when the value of L1 / D is greater than 0.32, the length of the air-pushing blade 133 relative to the impeller 100 is too large, which will increase the load of the impeller 100 and reduce the speed of the impeller 100. Therefore, this embodiment sets the range of L1 / D between 0.21 and 0.32 (including the endpoints). Through the above parameter settings, it can ensure that the air-pushing effect of the air-pushing blade 133 is relatively good, and will not cause the load of 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 (including the endpoints), which are not listed here one by one.

[0067] The length of the third side 1339 is h1 (see Figure 5 and Fig. 9 ), h1 and L1 (the length of the second side 1336) satisfy the relationship: 0.38≤h1 / L1≤0.51. When the value of h1 / L1 is less than 0.38, the air pushing effect of the air pushing blade 133 is reduced due to the small width-to-length ratio of the air pushing blade 133; when the value of h1 / L1 is greater than 0.51, the air pushing effect of the air pushing blade 133 is reduced due to the large width-to-length ratio of the air pushing blade 133. Therefore, in this embodiment, the range of h1 / L1 is set between 0.38 and 0.51 (including the endpoints). Through the above parameter settings, it can be ensured that the air pushing effect of the air pushing blade 133 is 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 (including the endpoints), which are not listed here one by one.

[0069] The arc line along which the curved edge segment 1334 is a circular arc, and the radius of the circular arc along which the curved edge segment 1334 is a circular arc is R (see Figure 5 and Fig. 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 edge section 1334 is too short, and the pusher blade 133 cannot achieve the ideal effect of reducing the load; when the value of R / L1 is greater than 0.83, the length of the curved edge section 1334 is too long, and the pusher blade 133 cannot achieve the ideal effect of reducing the load. Therefore, this embodiment sets the range of R / L1 between 0.62 and 0.83 (including the endpoints). Through the above parameter settings, 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 (including the endpoints), which are not listed here one by one.

[0071] The central angle Q of the arc along which the curved edge segment 1334 is located (see Figure 5 and Fig. 9) satisfies the relationship: 55°≤Q≤82°. When Q is less than 55° or greater than 82°, the curved edge section 1334 cannot form an ideal streamlined contour line with the first side edge 1333, thereby reducing the wind pushing effect of the wind pushing blade 133 and increasing the load on the impeller 100. Therefore, this embodiment sets the range of Q between 55° and 82° (including the endpoints). Through the above parameter setting, it is possible to ensure the wind pushing effect of the wind pushing blade 133 and increase the air volume of the impeller 100, and reduce the load of the wind pushing blade 133 on the impeller 100, so that the impeller 100 is safer, more stable and more reliable when 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° (including the endpoints), which will not be listed here one by one.

[0073] The height of the pusher blade 133 is h (see Fig.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, and 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, since the height of the pusher blade 133 is too small relative to the outer diameter of the impeller 100, the load of the pusher blade 133 will increase and the air volume will be reduced; when the value of h / D is greater than 0.14, since the height of the pusher blade 133 is too large relative to the outer diameter of the impeller 100, the load of the pusher blade 133 will also increase and the air volume will be reduced. Therefore, in this embodiment, the range of h / D is set between 0.08 and 0.14 (including the end points). Through the above parameter settings, it can be ensured that the effect of the pusher blade 133 in reducing the load of the impeller 100 and increasing the air volume is within a relatively good range.

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

[0075] In summary, by setting the above-mentioned groups of parameters, the impeller 100 can increase its own air volume and wind speed under a lower load condition, thereby improving the cooking efficiency of the cooking appliance using the impeller 100 and shortening the cooking time.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not drive the essence of the corresponding technical solutions out of the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An impeller, characterized in that: include: A main body and a plurality of fan blades, wherein the main body is suitable for connecting to a rotating shaft for driving the impeller; A plurality of the fan blades are arranged in sequence and spaced around the main body and are respectively connected to the main body; the fan blades include: A blade portion connected to the main body portion, wherein the blade portion is extended along the rotation plane of the impeller; as well as A push air blade, wherein the push air blade is connected to the blade portion and bent relative to the blade portion, and the bending direction of the push air blade relative to the blade portion intersects with the rotating plane; the push air blade has a first push air end relatively far away from the main body portion and a second push air end relatively close to the main body portion; the push air blade includes a first side edge away from the blade portion, the first side edge is located between the first push air end and the second push air end, the first side edge includes a curved side segment and a straight side segment connected in succession, the curved side segment is located at the second push air end, and the arc line where the curved side segment is located intersects with the straight line where the straight side segment is located.

2. The impeller according to claim 1, characterized in that The air pushing blade also includes a second side connected to the blade portion, the second side having a first end point located at the first air pushing end and a second end point located at the second air pushing end; the air pushing blade extends in a straight line in a direction from the second end point to the first end point.

3. The impeller according to claim 2, characterized in that The first endpoint is arranged on an outer reference circle with the axis of the rotating shaft as the center, and an angle β1 between a tangent line of the outer reference circle at the first endpoint and an extension line of the second side edge satisfies the relationship: 67°≤β1≤78°.

4. The impeller according to claim 2, characterized in that: The second endpoint is arranged on an inner reference circle with the axis of the rotating shaft as the center, and an angle β2 between a tangent line of the inner reference circle at the second endpoint and the second side edge satisfies the relationship: 48°≤β2≤65°.

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

32.

6. The impeller according to claim 2, characterized in that: The air pushing blade further includes a third side edge, which is located at the first air pushing end and connected between the straight edge section and the blade portion, and the third side edge extends along a straight line.

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

51.

8. The impeller according to claim 7, characterized in that The outer diameter of the impeller is D, the height of the air-pushing blade is h, and h and D satisfy the relationship: 0.08≤h / D≤0.

14.

9. The impeller according to claim 2, characterized in that: The length of the second side is L1, the arc line where the curved side 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.

10. The impeller according to any one of claims 1 to 9, characterized in that: The arc line where the curved edge segment is located is a circular arc, and the center angle of the circular arc is Q, and Q satisfies the relationship: 55°≤Q≤82°.

11. The impeller according to any one of claims 1 to 9, characterized in that The number of the fan blades is Z, and Z satisfies the relationship: 9≤Z≤11.

12. The impeller according to any one of claims 1 to 9, characterized in that The impeller is configured to rotate around the rotation axis along a specified direction; the air-pushing blade is connected to the windward side of the blade portion when it rotates.

13. The impeller according to claim 12, characterized in that The straight edge segment and the curved edge segment are tangent.

14. The impeller according to any one of claims 1 to 9, characterized in that The impeller further comprises a reinforcement portion, which is arranged on the blade portion and extends on the blade portion along the main body portion in a direction away from the main body portion. The reinforcement portion is a groove or a convex rib formed on the upper portion of the blade.

15. A cooking utensil, characterized in that: The invention comprises a main machine and an impeller according to any one of claims 1 to 14, wherein the impeller is rotatably arranged in the main machine.

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