CN220204186U - Impeller and cooking utensil - Google Patents

Abstract

The application relates to the technical field of kitchen appliances, in particular to an impeller and a cooking utensil, wherein the impeller comprises a body part and a plurality of fan blades; the body part is suitable for being connected with a rotating shaft for driving the impeller to rotate; the fan blades are sequentially arranged at intervals around the body part and are respectively connected with the body part; the fan blade includes: blade part and wind pushing blade; the blade part is connected with the body part and extends along the rotation plane of the impeller; the pushing blade is connected with the blade part and is bent relative to the blade part, and the bending direction of the 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 which is relatively far away from the body part and a second air pushing end which is relatively close to the body part; the pushing vane comprises a first side edge connected to the vane part, wherein the first side edge is provided with a first end point positioned at a first pushing end and a second end point positioned at a second pushing end. The impeller has the beneficial effects of low load, large air quantity and high air speed.

Description

Impeller and cooking utensil

Technical Field

The application relates to the technical field of kitchen appliances, in particular to an impeller and a cooking utensil.

Background

When the air cooking appliances such as the air frying pot and the oven work, the food is baked through penetrating the food by hot air and taking away moisture in the food, so that the cooking effect is mainly influenced by the speed and trend of air flow, the trend of the air flow is mainly guided by an air duct, and the speed of the air flow is mainly influenced by the performance of an impeller. Many researchers in the past put major efforts on optimizing the air duct and rarely research the impeller, but the cooking effect of the air cooking appliance is not only affected by the air duct, but the impeller has a decisive influence on it. At present, the impeller on the market usually only considers the simplicity of processing and manufacturing, but omits the design of the impeller structure, so that the impeller has weak working capacity and small air quantity, and the cooking efficiency of the cooking appliance with the impeller is reduced.

Disclosure of Invention

The application provides an impeller, and the application still provides a cooking utensil.

In a first aspect, the present application provides an impeller, the impeller including a body portion and a plurality of blades; the body part is suitable for being connected with a rotating shaft for driving the impeller to rotate; the fan blades are sequentially arranged at intervals around the body part and are respectively connected with the body part; the fan blade comprises a blade part and a wind pushing blade; the blade part is connected with the body part and extends along the rotation plane of the impeller; the pushing blade is connected with the blade part and is bent relative to the blade part, and the bending direction of the 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 which is relatively far away from the body part and a second air pushing end which is relatively close to the body part; the air pushing blade comprises a first side edge connected with the blade part, wherein the first side edge is provided with a first end point positioned at a first air pushing end and a second end point positioned at a second air pushing end; the first end point is arranged on an outer reference circle taking the axis of the rotating shaft as the center of a circle, and the included angle beta 1 between the tangent line of the outer reference circle at the first end point and the extension line of the first side meets the relation: beta 1 is 67-78 deg.

Optionally, in some embodiments, the second end point is disposed on an inner reference circle centered on the axis of the rotating shaft, and an angle β1 between a tangent line of the inner reference circle at the second end point and the first side satisfies the relationship: beta 1 is more than or equal to 48 degrees and less than or equal to 65 degrees.

Optionally, in some embodiments, the impeller is configured to rotate in a specified direction about the rotation axis; the blade part comprises a first blade side and a second blade side, the first blade side is positioned on the windward side of the blade part when rotating, and the second blade side is positioned on the leeward side of the blade part when rotating; the first blade side edge extends along a straight line.

Optionally, in some embodiments, the blade portion further comprises a third blade side located at an end of the blade portion relatively remote from the body portion; the edge of the third blade side extends linearly, and two ends of the third blade side are respectively connected with the end points of the first blade side and the end points of the second blade side.

Optionally, in some embodiments, the first side edge has a length L and the third blade side edge has a length W, W and L satisfying the relationship: W/L is more than or equal to 0.26 and less than or equal to 0.35.

Optionally, in some embodiments, the first side edge has a length L, the second blade side edge extends along an arc, the arc on which the second blade side edge is located is an arc, and the radii of the arc are R, where R and L satisfy the relationship: R/L is more than or equal to 0.78 and less than or equal to 0.86.

Optionally, in some embodiments, the second blade side extends along an arc, the arc on which the second blade side is located is an arc, and a central angle Φ of the arc satisfies the relationship: phi is more than or equal to 47 degrees and less than or equal to 58 degrees.

Optionally, in some embodiments, the angle ψ of the third blade side with the first blade side satisfies the relation: and the angle of psi is more than or equal to 42 degrees and less than or equal to 56 degrees.

Optionally, in some embodiments, the impeller has an outer diameter D, and the impeller blades have a furthest vertical distance from the blade portion of h, where h and D satisfy the relationship: h/D is more than or equal to 0.08 and less than or equal to 0.14.

Optionally, in some embodiments, the number Z of fan blades satisfies the relation: z is more than or equal to 9 and less than or equal to 11.

Optionally, in some embodiments, the impeller further comprises a reinforcing portion provided to the blade portion, the reinforcing portion extending on the blade portion along the body portion in a direction away from the body portion, the reinforcing portion being a groove or bead formed on an upper portion of the blade.

Optionally, in some embodiments, the air pushing blade further includes a second side edge away from the blade portion, the second side edge being located between the first air pushing end and the second air pushing end, and an end of the second side edge adjacent to the second air pushing end being an arc.

Optionally, in some embodiments, the second side includes a straight edge section and a curved edge section that are connected in succession, the curved edge section is closer to the second wind pushing end than the straight edge section, an end of the curved edge section away from the straight edge section is connected to an end point of the first side, and a straight line where the straight edge section is located intersects or is tangent to an arc line where the curved edge section is located.

Optionally, in some embodiments, the air pushing blade further includes a third side located at the first air pushing end, and two ends of the third side are connected to the end point of the first side and the end point of the straight edge section, respectively.

In a second aspect, the application further provides a cooking appliance, the cooking appliance comprises a main machine and an impeller, and the impeller is rotatably arranged in the main machine.

In the impeller provided by the application, because the wind pushing blade is arranged on the blade part, the wind pushing blade is bent relative to the blade part, and the bending direction is intersected with the rotation plane, so that the air flow can be disturbed on the rotation plane when the impeller rotates, and the air flow can be disturbed in the bending direction (for example, in the direction perpendicular to the rotation plane) of the wind pushing blade, the disturbance efficiency of the whole impeller to the air flow is higher, and the air quantity of the impeller can be improved.

Further, the air pushing blade has a first air pushing end relatively far from the body portion and a second air pushing end relatively close to the body portion, the air pushing blade includes a first side connected to the blade portion, the first side has a first end point located at the first air pushing end and a second end point located at the second air pushing end, the first end point is arranged on an outer reference circle taking the axis of the rotating shaft as a center, and an included angle β1 between a tangent line of the outer reference circle at the first end point and an extension line of the first side satisfies a relation: beta 1 is 67-78 deg. If the angle of beta 1 is smaller than 67 degrees, the deflection angle of the fan blade relative to the rotation center of the impeller is overlarge, so that disturbance of the fan blade to air flow is weakened, and the air quantity is reduced; if the angle of beta 1 is larger than 78 degrees, the deflection angle of the fan blade relative to the rotation center of the impeller is too small, so that the wind resistance of the fan blade is increased, and the load of the impeller is increased; therefore, the beta 1 is arranged between 67 degrees and 78 degrees (including end points), and the deflection angle of the fan blade relative to the rotation center of the impeller can be in a relatively good range, so that the air quantity, the air speed and the load of the impeller are in a relatively good range, and the effects of reducing the load of the impeller and improving the air quantity and the air speed are achieved.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an air fryer provided in some embodiments of the present application.

FIG. 2 is a cross-sectional view of the air fryer of FIG. 1 taken along the A-A direction.

Fig. 3 is a schematic structural view of an impeller provided in some embodiments of the present application.

Fig. 4 is an enlarged view of a partial structure of the impeller in fig. 3.

Fig. 5 is a top view of the impeller of fig. 3.

Fig. 6 is a bottom view of the impeller of fig. 5.

Fig. 7 is a schematic illustration of the feature sizes of the impeller of fig. 6.

Fig. 8 is a partial enlarged view of the impeller of fig. 7.

Fig. 9 is a left side view of the impeller of fig. 7.

Description of the reference numerals: 100. an impeller; 11. a body portion; 13. a fan blade; 131. a blade section; 1311. a first blade side; 1312. a second blade side; 1313. a third blade side; 1314. a connection part; 1315. a blade body; 133. a wind pushing blade; 1331. the first wind pushing end; 1332. the second wind pushing end; 1333. a first side; 1334. a second side; 1335. a straight edge section; 1336. a curved edge section; 1337. a first endpoint; 1338. a second endpoint; 1339. a third side; 15. a reinforcing part; 151. a first reinforcing end; 152. a second reinforcing end; 153. a first reinforcing edge; 154. a second reinforcing edge; 16. an outer reference circle; 17. an inner reference circle; 200. a cooking appliance; 21. a host; 22. a pot body; 23. a handle; 24. a driving motor; 25. cooking space.

Detailed Description

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "inner," and the like indicate orientation or positional relationships based on those shown in the drawings, and are merely used for simplifying the description of the present application, rather than indicating or implying that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

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

Furthermore, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like should be construed broadly. For example, the connection can be fixed connection, detachable connection or integral connection; can be mechanically or electrically connected; the connection may be direct, indirect via an intermediate medium, or communication between two elements, or only surface contact. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

As a particular component is referred to by some of the terms used in the description and claims, it should be understood by those skilled in the art that a hardware manufacturer may refer to the same component by different terms. The description and claims do not take the difference in name as a way of distinguishing between components, but rather take the difference in functionality of the components as a criterion for distinguishing. As used throughout the specification and claims, the word "comprise" and "comprises" are to be construed as "including, but not limited to"; by "substantially" is meant that a person skilled in the art can solve the technical problem within a certain error range, essentially achieving the technical effect.

Referring to fig. 1 and 2, the present application provides an impeller 100 and a cooking appliance 200 to which the impeller 100 is applied. The cooking appliance 200 may be a kitchen tool having a baking function, which can fry food with heat. In operation, the cooking appliance 200 can generate hot air through the heating pipe in the pot body, and then blow the hot air into the pot by the fan to heat food, so that the hot air can circulate in the pot body, thereby dehydrating the food to achieve the effect of frying the food. Specifically, the cooking appliance 200 may be an air fryer, an air oven, an air microwave oven, etc., which is illustrated as an example.

In the present embodiment, the cooking appliance 200 may include the main machine 21, the pot 22, and the impeller 100 described above. The main machine 21 is provided with a containing cavity, and the pot body 22 and the impeller 100 are arranged in the containing cavity. Cooking appliance 200 may be a pull-out air fryer, a flip-type air fryer, a box-type air fryer, or the like. For example, in this embodiment, the pull type air fryer is taken as an example, the pot 22 has a handle 23, and a user can mount the pot 22 in the main machine 21 or take out the pot 22 from the main machine 21 by holding the handle 23. The cooking space 25 is formed inside the pot 22, and the cooking space 25 is an area of the cooking appliance 200 for holding and cooking food.

An air duct module, a control module, a heating module and the like can be arranged in the host 21, and the control module can be used for controlling a driving device of the driving motor 24 to work and can also be used for driving the heating module to work. The main machine 21 comprises a shell and a driving motor 24, the shell forms a containing cavity for containing the pot 22, the driving motor 24 is arranged in the shell, an output shaft of the driving motor 24 faces the containing cavity, an impeller 100 is connected to the output shaft of the driving motor 24, and the impeller 100 and the driving motor form a centrifugal fan together. One side of the impeller faces the cooking space 25. Thus, when the driving motor 24 works, the impeller 100 rotates, and negative pressure is formed on the side of the impeller 100 facing the cooking space 25, so that hot air in the cooking space 25 flows axially to the impeller 100 and further flows out radially to the impeller 100, and then flows into the cooking space 25, and when the impeller 100 continuously rotates, the circulating flow of the hot air between the cooking space 25 and the impeller 100 can be realized (refer to the path shown by the arrow in fig. 2, and only reference is made here, and no limitation is made on the air flow mode). When the hot air flow passes through the food in the cooking space 25, moisture in the food can be taken away, and the food can be baked. With the above arrangement, the impeller 100 can increase the air volume of the air fryer and can withstand the load that increases with the increase in the air volume, so that the cooking efficiency of the air fryer can be improved, and the air fryer is safe and reliable.

Referring to fig. 3, 4 and 5, the impeller 100 includes a body portion 11 and a plurality of blades 13. The body 11 is a main body of the impeller 100, and is located substantially at the center of the impeller 100. The body 11 is adapted to be connected to a rotation shaft for driving the impeller 100 to rotate, and the rotation shaft may be an output shaft of a driving device (for example, the driving motor 24 described above) for driving the impeller 100 to rotate to generate an air flow. The main body 11 has a rotation axis O when driven by the drive motor 24, and the rotation axis O is the axis of the output shaft of the drive motor 24, and thus, the main body 11 also has a radial direction which is a straight line direction intersecting the rotation axis O perpendicularly. As an example, the body portion 11 in the present specification is described by taking a substantially circular plate shape as an example, and the references to "radial direction", "rotation axis", or "rotation axis" of the body portion 11, etc., which will be referred to hereinafter, are to be construed correspondingly as directions of the radial direction and the rotation axis O of the body portion 11 herein; similarly, reference to "circumferential" of the body portion 11 hereinafter is to be understood as a direction in which the outer circumference of the body portion 11 is circumferentially surrounded; the term "rotation plane" is understood hereinafter to mean the plane in which the impeller 100 rotates, which is perpendicular to the axis of rotation O.

The plurality of fan blades 13 are arranged around the body 11 at intervals in sequence along the circumferential direction of the body 11, and are respectively connected to the body 11. The plurality of fan blades 13 are disposed radially outward of the body portion 11 and extend radially outward relative to the body portion 11. The fan blades 13 are used for guiding the airflow to flow along the radial direction of the impeller 100, so that the impeller 100 becomes a centrifugal impeller, and the pressure on one axial side of the impeller 100 becomes negative pressure, when the impeller 100 is applied to the cooking appliance 200, the negative pressure side of the impeller 100 faces the food in the cooking space 25 of the cooking appliance 200, so that the hot air in the cooking space 25 flows along the axial direction to the impeller 100, flows out further along the radial direction of the impeller 100, and then enters the cooking space 25, and when the impeller 100 continuously rotates, the circulating flow of the air between the cooking space 25 and the impeller 100 can be realized (refer to the path shown by the arrow in fig. 2, and only reference is made here, and the limitation of the air flow mode is not made). When the hot air flow passes through the food in the cooking space 25, moisture in the food can be taken away, and the food can be baked.

In this embodiment, the fan blade 13 is integrally formed with the body 11, for example, by punching. The number of the fan blades 13 is 11. In other embodiments, the fan blades 13 may be welded, adhered or fixedly connected to the body portion 11 by bolts, and the number of the fan blades 13 may be any integer not less than 9 and not more than 11, for example, 9 or 10. By limiting the number of the fan blades 13 to the above range, it is possible to ensure that the air volume and the air speed of the fan blades 13 are both within a relatively preferable range.

In this embodiment, each fan blade 13 has an identical structure, and each fan blade 13 includes a blade portion 131 and a pushing fan blade 133. In other embodiments, the structures of the plurality of blades 13 may not be identical, for example, a part of the blades 13 may be identical, and the blades 13 with the same structure include the blade portion 131 and the pushing blade 133. One end of the vane portion 131 is connected to the body portion 11, and the other end extends in a direction away from the body portion 11 in a radial direction of the body portion 11, and the vane portion 131 is disposed to extend along a rotation plane of the impeller 100 and is configured to rotate along with the body portion 11 to generate an air flow. The air pushing blade 133 is connected to the blade 131 and is bent with respect to the blade 131, and is configured to rotate along with the blade 131 and increase the air volume of the impeller 100. The bending direction of the wind pushing blade 133 with respect to the blade portion 131 intersects with the rotation plane of the impeller 100, and the included angle therebetween may be in the range of 90 ° to 150 ° (inclusive). The air pushing blade 133 has a first air pushing end 1331 relatively far from the body portion 11 and a second air pushing end 1332 relatively close to the body portion 11. The air pushing blade 133 includes a first side 1333 connected to the 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 has a first end point 1337 at the first push end 1331 and a second end point 1338 at the second push end 1332. The first end 1337 (i.e., the furthest point of the fan blade 13 from the radial direction of the body portion 11 to the body portion 11) is arranged on an outer reference circle 16 (see fig. 7), the outer reference circle 16 being centered on the rotation center (i.e., the rotation axis O) of the body portion 11. The outer reference circle 16 is understood to be a circle formed by sequentially connecting the circular arcs of the respective first end points 1337. The angle between the tangent of the outer reference circle 16 at the first end 1337 and the extension of the first side 1333 is the blade outlet mounting angle β1 (see fig. 7), β1 satisfying the relationship: beta 1 is 67-78 deg.

With the above arrangement, since the wind-pushing blades 133 are provided on the blade portions 131, the wind-pushing blades 133 are bent with respect to the blade portions 131, and the bending direction intersects with the rotation plane, the air flow can be disturbed not only on the rotation plane but also in the bending direction (for example, in the direction perpendicular to the rotation plane) of the wind-pushing blades 133 when the impeller 100 is rotated, so that the efficiency of the disturbance of the air flow by the impeller 100 as a whole is high, and the air volume of the impeller 100 can be improved.

Further, when the installation angle β1 of the blade outlet is smaller than 67 °, the deflection angle of the blade 13 relative to the rotation center of the impeller 100 is too large, so as to weaken disturbance of the blade 13 on the airflow and reduce the air quantity; when the installation angle beta 1 of the blade outlet is larger than 78 degrees, the deflection angle of the blade 13 relative to the rotation center of the impeller 100 is too small, so that the wind resistance of the blade 13 is increased, the load of the impeller 100 is increased, and the wind speed is reduced; therefore, the installation angle β1 of the blade outlet is set between 67 ° and 78 ° (including the end points), so that the deflection angle of the blade 13 relative to the rotation center of the impeller 100 is in a relatively preferred range, and the air volume, the air speed and the load of the impeller 100 are in a relatively preferred range, so as to achieve the effects of reducing the load of the impeller 100 and improving the air volume and the air speed.

Alternatively, the blade outlet mounting angle β1 may be 68 °, 69 °, 70 °, 71 °, 72 °, 73 °, 74 °, 75 °, 76 °, 77 °, etc., although the blade outlet mounting angle β1 may be other values between 67 ° and 78 ° (inclusive), which are not illustrated here.

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

Referring to fig. 3, 4 and 5, the impeller 100 is configured to rotate in a designated direction (arrow direction in fig. 3) about a rotation axis O, and the blade portion 131 extends along a rotation plane of the impeller 100. In the present embodiment, the blade 131 has a substantially plate shape, and the "extending" direction or the "extending" direction is understood to be the direction of the plane in which the plate shape of the blade 131 is located.

The plurality of vane portions 131 may be substantially uniformly distributed (e.g., equally spaced) along the circumferential direction of the body portion 11, so that when the impeller 100 is applied to the drive motor 24 (see fig. 2), the generated air flow is relatively uniform, and the manufacturing process of the vane portions 131 may be simplified, thereby reducing the difficulty of manufacturing and processing the vane portions 131.

The blade portion 131 includes a connecting portion 1314 and a blade body 1315. The connection portion 1314 is connected between the body portion 11 and the blade body 1315. In order to facilitate the processing and manufacturing of the blade portion 131, the connection portion 1313 is integrally formed with the body portion 11 and the blade body 1315. The connecting portions 1314 of two adjacent blade portions 131 can be directly connected and integrally formed, so that the processing and the manufacturing are convenient, the integrity of the impeller 100 can be ensured, and the structural strength of the impeller 100 can be improved. The vane bodies 1315 of the adjacent two vane parts 131 are spaced apart for generating air flow when the impeller 100 rotates. It will be appreciated that, in this application, although different designations are used for the connection portion 1314 and the blade body 1315 to refer to different portions of the blade portion 131, these designations should not be considered as limiting the structure of the blade portion 131, these designations are made merely for convenience of description, for example, the connection between the connection portion 1314 and the blade body 1315 may be an integrally formed connection structure, and there may be no distinct dividing line between the connection portion 1314 and the blade body 1315.

The blade portion 131 includes a first blade side 1311 and a second blade side 1312, the first blade side 1311 being located on the windward side of the blade portion 131 when rotated and coinciding with the first side 1333. In the present embodiment, the length of the first blade side 1311 is greater than the length of the first side 1333, and the first blade side 1311 completely covers the first side 1333, and in other embodiments, the first blade side 1311 may be equal in length to the first side 1333, or the length of the first blade side 1311 is less than the length of the first side 1333, where the length relationship between the two is not limited. The second blade side 1312 is located on the leeward side of the blade portion 131 when rotated. 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 near the body portion 11 is connected to one end of the second blade side 1312 of the adjacent blade portion 131 near the body portion 11. The first blade side 1311 extends along a straight line, and the straight line along which the first side 1311 extends does not pass through the rotation center of the body portion 11 and is inclined with respect to the radial direction of the body portion 11. By the above arrangement, the length of the first blade side 1311 can be increased, and the length of the windward surface when the blade 131 rotates can be increased, thereby improving the air volume. The second blade side 1312 extends along an arc, the arc along which the second blade side 1312 projects toward the first blade side 1311. By the arrangement, the wind resistance of the blade part 131 during the rotation of the impeller 100 can be reduced, so that the rotation speed of the impeller 100 is increased, and the purpose of increasing the air volume provided during the rotation of the impeller 100 is achieved.

The blade portion 131 further includes a third blade side 1313, the third blade side 1313 being a side of the blade body 1315 remote 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, and a distance from one end of the first blade side 1311 away from the body 11 to the body 11 in the radial direction of the body 11 is greater than a distance from one end of the second blade side 1312 away from the body 11 in the radial direction of the body 11 to the body 11. The third blade side 1313 extends along a straight line, wherein the angle ψ (see fig. 8) between the third blade side 1313 and the first blade side 1311 satisfies the relation: and the angle of psi is more than or equal to 42 degrees and less than or equal to 56 degrees. When the included angle ψ is smaller than 42 °, the deflection angle of the third blade side 1313 with respect to the first blade side 1311 is too small, so that the disturbance capability of the blade 131 to the airflow is reduced, thereby reducing the air volume of the impeller 100; when the included angle ψ is greater than 56 °, the wind resistance suffered by the rotation of the blade 131 is increased due to the excessively large deflection angle of the third blade side 1313 with respect to the first blade side 1311, thereby increasing the load of the impeller 100 and reducing the wind speed and the wind volume. Therefore, the range of the included angle ψ is set to 42 ° -56 ° (including the end points), and by the above parameter setting, the contour line length of the windward side of the blade 131 can be increased, i.e. the effective wind disturbing length can be increased, the wind disturbing efficiency can be improved, and the wind resistance, load and wind speed and wind volume of the blade 131 can be further reduced.

Alternatively, the included angle ψ may be 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 °, 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, or the like, and of course, the included angle ψ may be other values between 42 ° and 56 ° (inclusive), which are not exemplified here.

The push vane 133 further includes a second side 1334 remote from the vane portion 131, the second side 1334 being located between the first push end 1331 and the second push end 1332. The end of the second side 1334 adjacent to the second wind end 1332 is curved (hereinafter "curved side section 1336").

Further, the second side 1334 includes a curved side section 1336 and a straight side section 1335 that are connected in succession, the curved side section 1336 being closer to the second wind-pushing end 1332 than the straight side section 1335. A straight section 1335 is located at the first wind pushing end 1331, and the straight section 1335 extends along a straight line. The curved edge section 1336 is located at the second wind-pushing end 1332, the curved edge section 1336 extends along an arc, and protrudes towards the direction away from the blade portion 131, and one end of the curved edge section 1336 away from the straight edge section 1335 is connected with the end point of the first side edge 1333. The arc in which the curved edge section 1336 lies intersects or is tangent to the straight line in which the straight edge section 1335 lies. In this embodiment, the arc of the curved edge 1336 is tangent to the straight edge 1335, and in other embodiments, the arc of the curved edge 1336 and the straight edge 1335 may intersect only but not be tangent. Through the above arrangement, the second wind pushing end 1332 of the wind pushing blade 133 has a streamline contour line, the second wind pushing end 1332 is relatively closer to the rotation center, and the air flow disturbance at the rotation center is relatively stronger and the wind resistance is larger, so that the wind resistance received by the wind pushing blade 133 during rotation can be reduced by the structural design, and the load of the impeller 100 is reduced to a certain extent, so that the effect of improving the rotation speed of the impeller 100 is achieved; in addition, since the contour line of the second air pushing end 1332 is curved, the air flow impinging on the air pushing blade 133 can be almost completely thrown out from the first air pushing end 1331 along the rotation plane, so as to improve the air volume of the impeller 100.

The push vane 133 further includes a third side 1339. The third side 1339 is located at the first wind-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 body portion 11 and an end of the second side 1334 away from the body portion 11 (i.e., an end of the straight side section 1335 away from the curved side section 1336). The third side 1339 extends along a straight line. By the arrangement, the wind resistance received by the pushing blade 133 during rotation can be further reduced, and the air quantity of the pushing blade 133 can be improved.

The impeller 100 further includes a reinforcing portion 15, where the reinforcing portion 15 is disposed between the blade portion 131 and the first blade side 1311 and the second blade side 1312, and is used to increase the strength of the blade portion 131 to resist airflow impact suffered during operation of the impeller 100. The reinforcement portion 15 extends on the blade portion 131 in a direction of the body portion 11 away from the body portion 11, the reinforcement portion 15 having a first reinforcement end 151 relatively close to the body portion 11 and a second reinforcement end 152 relatively far from the body portion 11, the second reinforcement end 152 having a width smaller than that of the first reinforcement end 151. Specifically, the reinforcing portion 15 extends from the connection portion 1316 to the blade body 1317, i.e., the first reinforcing end 151 is located on the connection portion 1314 and the second reinforcing end 152 is located on the blade body 1315. Through the above arrangement, the strength of the blade portion 131 and the body portion 11 can be effectively improved by the reinforcing portion 15, so that when the impeller 100 is impacted by the airflow in the working process, the deformation of the blade portion 131 and the body portion 11 can be avoided to a certain extent by the reinforcing portion 15, and the impeller 100 is protected.

Further, the reinforcing portion 15 includes a first reinforcing edge 153 and a second reinforcing edge 154. The first reinforcing edge 153 is disposed in spaced relation to the first blade side 1311. The second reinforcing edge 154 is spaced opposite the second blade side edge 1312. The second reinforcing edge 1333 extends along a prescribed arc that projects toward the first blade side 1311. The second reinforcing edge 154 has a curvature that is substantially the same as the curvature of the second blade side 1312. Through the above arrangement, the bending trend of the reinforcing portion 15 can be ensured to be approximately the same as that of the second blade side 1312, so that the reinforcing portion 15 is better adapted to the shape of the blade 131, the integral reinforcement of the blade 131 is ensured, and meanwhile, the wind resistance of the reinforcing portion 15 is reduced, so that the effect of improving the rotation speed and the wind quantity of the impeller 100 is achieved.

In the present embodiment, the reinforcing portion 15 is a groove (the reinforcing portion 15 protrudes toward the side close to the push blade 133 with respect to the blade 131) formed in the blade 131 by punching, which has advantages of light weight and good reinforcing effect. In other embodiments, the reinforcing portion 15 may be a rib (the reinforcing portion 15 protrudes toward a side away from the push blade 133 with respect to the blade 131) formed by punching the blade 131, or the reinforcing portion 15 may be a rib welded to the blade 131.

In some embodiments of the present application, the dimensions of the various portions of the impeller 100 are limited to ensure that the impeller 100 has a relatively large air volume at low loads, as described in detail below.

Referring to fig. 6 and 7, the second end point 1338 (i.e., the closest point of the push vane 133 to the body portion 11 in the radial direction of the body portion 11) is disposed on the inner reference circle 17, and the inner reference circle 17 is centered on the rotation center (i.e., the rotation axis O) of the body portion 11. The inner reference circle 17 is understood to be a circle formed by sequentially connecting the respective second end points 1338 in circular arcs. The angle between the tangent line of the inner reference circle 17 at the second end 1338 and the first side 1333 is the blade inlet mounting angle β2, and the blade inlet mounting angle β2 satisfies the relationship: beta 2 is more than or equal to 48 degrees and less than or equal to 65 degrees. When the blade inlet mounting angle β2 is smaller than 48 °, the deflection angle of the first side 1333 relative to the rotation center of the impeller 100 is too small, so that the load of the blade 13 is increased and the air quantity is reduced; when the blade inlet mounting angle β2 is greater than 65 °, the load of the fan blade 13 is increased and the air volume is reduced due to the excessive deflection angle of the first side 1333 with respect to the rotation center of the impeller 100. In this embodiment, the range of the inlet mounting angle β2 of the blade is set to 48 ° -65 ° (including the end points), so that the offset angle of the blade 13 with respect to the rotation center of the impeller 100 can be ensured to be in a relatively preferred range, and thus the air volume and the air speed of the impeller 100 are in a relatively preferred range.

Alternatively, the blade inlet mounting angle β2 may be 49 °, 51 °, 53 °, 55 °, 57 °, 59 °, 61 °, 63 °, 65 °, etc., although the blade inlet mounting angle β2 may be other values between 48 ° and 65 ° (inclusive), which are not illustrated here.

Referring to fig. 7 and 8, the first side 1333 has a length L and the third blade side 1313 has a length W, W and L satisfying the relationship: W/L is more than or equal to 0.26 and less than or equal to 0.35. When the W/L is less than 0.26, the length of the third vane side 1313 relative to the first side 1333 is too short, so that the turbulence effect of the vane 131 on the air flow is reduced, thereby reducing the air volume of the impeller 100; when W/L is greater than 0.35, the length of the third blade side 1313 opposite to the first side 1333 is too long, so that the wind resistance suffered by the blade 131 is increased, and the load of the fan blade 13 is increased, and the rotation speed of the impeller 100 is reduced. In this embodiment, the W/L range is set between 0.26 and 0.35 (including the end points), and through the above parameter setting, the effect of the blade 131 on the disturbance of the airflow is relatively good, the air volume of the impeller 100 is increased, and the overload of the impeller 100 is not caused, i.e. the relatively fast wind speed of the impeller 100 is ensured.

Alternatively, W/L may be 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, etc., although W/L may be other values between 0.26 and 0.35 (inclusive), not being exemplified herein.

The second blade side 1312 extends along an arc, the arc where the second blade side 1312 is located is an arc, the radius of the arc is R, and R and L (the length of the first side 1333 is L) satisfy the relationship: R/L is more than or equal to 0.78 and less than or equal to 0.86. When R/L is less than 0.78, the curvature of the second vane side 1312 is too large relative to the first side 1333, so that the turbulence effect of the vane 131 on the air flow is reduced, and the air volume of the impeller 100 is reduced; when R/L is greater than 0.86, the second vane side 1312 has a smaller bending arc than the first side 1333, and therefore, the wind resistance of the vane 131 increases, so that the load of the fan blade 13 increases, and the rotation speed of the impeller 100 decreases. In this embodiment, the R/L range is set between 0.78 and 0.86 (including the end points), and through the above parameter setting, the effect of the blade 131 on the disturbance of the airflow is relatively good, the air volume of the impeller 100 is increased, and the overload of the impeller 100 is not caused, i.e. the relatively fast wind speed of the impeller 100 is ensured.

Alternatively, R/L may be 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, etc., although R/L may be other values between 0.78 and 0.86 (inclusive), which are not illustrated herein.

The central angle Φ of the arc where the second blade side 1312 is located satisfies the relationship: phi is more than or equal to 47 degrees and less than or equal to 58 degrees. When Φ is smaller than 47 °, the bending arc of the second blade side 1312 is too small, so that the wind resistance suffered by the blade 131 is increased, and the load of the fan blade 13 is increased, and the rotation speed of the impeller 100 is reduced; when Φ is greater than 58 °, the curvature of the second vane side 1312 is too large, so that the turbulence effect of the vane 131 on the air flow is reduced, thereby reducing the air volume of the impeller 100. In this embodiment, the range of Φ is set between 47 ° and 58 ° (including the end points), and through the above parameter setting, the disturbance effect of the blade 131 on the airflow is relatively good, the air volume of the impeller 100 is increased, and the overload of the impeller 100 is not caused, that is, the wind speed of the impeller 100 is relatively fast.

Alternatively, the central angle Φ of the arc where the second blade side 1312 is located may be 48 °, 49 °, 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, or the like, and of course Φ may also be other values between 47 ° and 58 ° (inclusive), which are not illustrated here.

Referring to fig. 7 and 9, the outer diameter of the fan blade 131 is D, and the outer diameter of the fan blade 131 can be understood as the diameter of the outer reference circle 16. The farthest vertical distance from the wind blade 133 to the blade 131 is h, specifically, h is the farthest vertical distance from the second side 1334 to the blade 133, and h and D satisfy the relation: h/D is more than or equal to 0.08 and less than or equal to 0.14. When the value of h/D is less than 0.08, the height of the impeller 133 is too small relative to the outer diameter of the impeller 100, so that the load of the impeller 133 is increased and the air volume is reduced; when the value of h/D is greater than 0.14, the height of the impeller 133 is too large relative to the outer diameter of the impeller 100, which also increases the load of the impeller 133 and reduces the air volume. Therefore, the h/D range is set between 0.08 and 0.14 (including the end points), and the above parameter setting can ensure that the effect of the impeller blades 133 for reducing the load of the impeller 100 and improving the air volume is in a relatively better range.

Alternatively, the value of h/D may be 0.09, 0.10, 0.11, 0.12, 0.13, etc., although h/D may be other values between 0.08 and 0.14 (inclusive), which are not illustrated here.

In summary, by setting the above-mentioned parameters, the impeller 100 can increase its own air volume and air speed under a low load, thereby improving the cooking efficiency and shortening the cooking time of the cooking appliance to which the impeller 100 is applied.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting. Although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents. Such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (15)

1. An impeller is characterized by comprising a body part and a plurality of fan blades; the body part is suitable for being connected with a rotating shaft for driving the impeller to rotate; the fan blades are sequentially arranged around the body part at intervals and are respectively connected with the body part; the fan blade includes: a blade portion connected to the main body portion, the blade portion extending along a rotation plane of the impeller; and

the pushing blade is connected with the blade part and is bent relative to the blade part, and the bending direction of the 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 which is relatively far away from the body part and a second air pushing end which is relatively close to the body part; the air pushing blade comprises a first side edge connected with the blade part, wherein the first side edge is provided with a first end point positioned at the first air pushing end and a second end point positioned at the second air pushing end; the first end point is arranged on an outer reference circle taking the axis of the rotating shaft as a circle center, and an included angle beta 1 between a tangent line of the outer reference circle at the first end point and an extension line of the first side edge meets the relation: beta 1 is 67-78 deg.

2. The impeller of claim 1 wherein the second end point is disposed on an inner reference circle centered about the axis of the shaft, the tangent to the inner reference circle at the second end point having an angle β2 with the first side that satisfies the relationship: beta 2 is more than or equal to 48 degrees and less than or equal to 65 degrees.

3. The impeller of claim 1, wherein the impeller is configured to rotate about the axis of rotation in a specified direction; the blade part comprises a first blade side edge and a second blade side edge, the first blade side edge is positioned on the windward side of the blade part when rotating, and the second blade side edge is positioned on the leeward side of the blade part when rotating; the first blade side edge extends along a straight line.

4. The impeller of claim 3, wherein the blade portion further comprises a third blade side located at an end of the blade portion relatively remote from the body portion; the third blade side edge extends linearly, and two ends of the third blade side edge are respectively connected with the end points of the first blade side edge and the end points of the second blade side edge.

5. The impeller of claim 4 wherein the first side edge has a length L and the third side edge has a length W, W and L satisfying the relationship: W/L is more than or equal to 0.26 and less than or equal to 0.35.

6. The impeller of claim 3 wherein the first side has a length L, the second vane side extends along an arc, the arc at which the second vane side is located is an arc, and the radii of the arc are R, R and L satisfy the relationship: R/L is more than or equal to 0.78 and less than or equal to 0.86.

7. The impeller of claim 3 wherein the second blade side extends along an arc, the arc at which the second blade side is located is an arc, and the central angle Φ of the arc satisfies the relationship: phi is more than or equal to 47 degrees and less than or equal to 58 degrees.

8. The impeller of claim 4 wherein the angle ψ of the third vane side with the first vane side satisfies the relationship: and the angle of psi is more than or equal to 42 degrees and less than or equal to 56 degrees.

9. The impeller of claim 1, wherein the impeller has an outer diameter D and the impeller blades have a furthest vertical distance h from the blade portion, h and D satisfying the relationship: h/D is more than or equal to 0.08 and less than or equal to 0.14.

10. The impeller of claim 1 wherein the number Z of blades satisfies the relationship: z is more than or equal to 9 and less than or equal to 11.

11. The impeller according to any one of claims 1 to 10, characterized in that the impeller further comprises a reinforcing portion provided to the blade portion, the reinforcing portion extending on the blade portion along the body portion in a direction away from the body portion, the reinforcing portion being a groove or a bead formed on an upper portion of the blade.

12. The impeller of any one of claims 1 to 10, wherein the impeller blade further comprises a second side edge remote from the blade portion, the second side edge being located between the first and second impeller ends, the second side edge being curved at an end thereof adjacent to the second impeller end.

13. The impeller of claim 12, wherein the second side comprises a straight edge section and a curved edge section connected in succession, the curved edge section being closer to the second wind-pushing end than the straight edge section, an end of the curved edge section remote from the straight edge section being connected to an end point of the first side, a straight line of the straight edge section intersecting or being tangent to an arc of the curved edge section.

14. The impeller of claim 13 wherein the impeller blade further comprises a third side edge at the first impeller end, the third side edge having ends connected to the first side edge end point and the straight edge section end point, respectively.

15. A cooking appliance comprising a main machine and an impeller according to any one of claims 1 to 14, the impeller being rotatably disposed within the main machine.