CN117514903A

CN117514903A - Impeller, axial fan and cooking utensil

Info

Publication number: CN117514903A
Application number: CN202210910729.7A
Authority: CN
Inventors: 任孟珂; 饶杰
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2024-02-06

Abstract

The invention discloses an impeller, an axial flow fan and a cooking utensil, wherein the impeller is set as the impeller of the axial flow fan, and comprises a hub, blades and a flow guiding structure, wherein a plurality of blades are annularly distributed on the hub; the flow guiding structure is arranged on the radial outer sides of the blades in a surrounding mode, is located between the front end of the impeller and the rear end of the impeller, and is connected with at least part of the blade tip parts of the blades so as to guide air flow formed when the impeller rotates. The axial flow fan disclosed by the application comprises the impeller; the cooking appliance disclosed by the application comprises the axial flow fan. The impeller can effectively reduce resistance of air flow and noise, and further effectively reduce energy consumption and noise of an axial flow fan applying the impeller; the performance of the cooking utensil applying the axial flow fan can be effectively improved, and the cooking utensil has better application prospect and market popularization value.

Description

Impeller, axial fan and cooking utensil

Technical Field

The invention relates to the technical field of fans, in particular to an impeller, an axial flow fan and a cooking utensil.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

An axial flow fan is a rotary mechanical device for generating wind pressure and wind quantity by acting on air. When the impeller rotates, gas axially enters the impeller from the air inlet end, and the pressure of the air flow is increased under the action of the blades on the impeller, so that the gas is promoted to flow. The axial flow fan is particularly suitable for application scenes with higher flow requirements and lower pressure requirements due to the high efficiency, large air quantity and the like. The ventilator is widely applied to fields of household appliances, metallurgy, chemical industry, light industry, foods, medical equipment and the like, for example, to various places requiring ventilation, and particularly to ventilation fans used in factories, houses, office places and the like; the heat-dissipating device is also widely applied to various scenes needing heat dissipation, such as an air cooler of an air conditioner, a fan for heat dissipation of a motor, a heat dissipation fan of a computer, an electromagnetic oven, an electric cooker and the like; in addition, it is widely used in various devices requiring the delivery of gaseous media, particularly in household appliances, axial fans are used to provide hot air to products such as air fryers, dishwashers, disinfectors, etc.

According to research, the main pneumatic noise of the axial flow fan is derived from the collision of high-speed air flow and impeller blades, the higher the wind speed in an impeller runner is, the larger the noise generated by the main pneumatic noise is, and the key technical problems to be solved by the technicians in the field are to reduce the noise of the fan and improve the efficiency of the fan. In a household appliance including a fan, for example, the fan is often in a continuous working state, if the fan is noisy, the experience of a user is seriously affected, and for a manufacturing enterprise, the quality of a product is also seriously affected. In addition, noise is large, so that the efficiency of the fan is low, energy consumption is increased, the service life of the fan is seriously influenced, and then the safety and reliability of a product comprising the fan are reduced.

FIG. 1 shows a prior art impeller construction, which is an integrally formed construction; fig. 2 shows a conventional fan, in which an impeller and a hub are separately provided. Research shows that the prior fan improvement means tend to optimize the blade structure of the fan impeller, including curve design of the impeller and bionic blade design; although these optimizations may improve efficiency and reduce noise to some extent; there is still much room for improvement. Therefore, the applicant provides an impeller, an axial flow fan and a cooking utensil which can effectively improve efficiency and reduce noise.

Disclosure of Invention

The invention aims to at least improve the efficiency of a fan and reduce noise. The aim is achieved by the following technical scheme:

a first aspect of the present invention proposes an impeller provided as an impeller of an axial flow fan, the impeller comprising:

a hub;

the blades are annularly distributed on the hub;

the guide structure is arranged on the radial outer sides of the blades in a surrounding mode, is positioned between the front end of the impeller and the rear end of the impeller, and is connected with at least part of the blade tip parts of the blades so as to guide air flow formed when the impeller rotates.

This application is through being in the radial outside of blade sets up the water conservancy diversion structure, because the water conservancy diversion structure is hugged closely the radial outside setting of impeller, can play a water conservancy diversion effect to the air current after the impeller acting at rotatory in-process to can isolate air intake and air outlet more effectively, can reduce the gas reflux effectively, and then can reduce the resistance of air current effectively, reduce noise, increase fan flow efficiency. In addition, the flow guiding structure is positioned between the front end of the impeller and the rear end of the impeller, and through verification, the flow guiding structure can more effectively improve the air quantity of the fan and reduce noise; and then under the condition of a certain air supply quantity, the energy consumption of the fan can be effectively reduced. In addition, the quality, performance, service life and the like of a product applying the product can be effectively improved, the user experience is improved, and the market competitive advantage of the product is further improved, so that the product has better application prospect and market value.

In addition, the impeller according to the invention may have the following additional technical features:

in some embodiments of the invention, the distance between the front end of the impeller and the rear end of the impeller is selectively defined as H, the distance between the rear end of the impeller and the first side of the flow guiding structure is defined as H1, the distance between the front end of the impeller and the second side of the flow guiding structure is defined as H2, the H1 is greater than 0 and less than H, and/or the H2 is greater than 0 and less than H.

In some embodiments of the present invention, the flow guiding structure is a ring structure with a uniform cross section, and the width of the flow guiding structure is defined as H3, where h=h1+h2+h3; the value of H1/H is 0.25 or more and 0.33 or less, and/or the value of H2/H is 0.14 or more and 0.27 or less.

In some embodiments of the invention, the flow directing structure is selectively configured as an integrally formed structure; alternatively, the impeller may be formed as an integrally molded structure.

In some embodiments of the present invention, the flow guiding structure selectively includes a plurality of arc-shaped flow guiding structural members, and the flow guiding structure is formed by splicing a plurality of arc-shaped flow guiding structural members; or, at least part of the blades are provided with arc-shaped flow guiding structural members, the blades and the arc-shaped flow guiding structural members are integrally formed, and when a plurality of blades are fixedly arranged at the set positions of the hub, a plurality of arc-shaped flow guiding structural members are adapted to construct the flow guiding structure.

In some embodiments of the invention, the impeller is selectively made to include a plurality of the blades evenly distributed around the hub.

In some embodiments of the present invention, the blades included in the impeller are selectively set to be front curved blade type blades, or the blades included in the impeller are set to be back curved blade type blades, or the blades included in the impeller are set to be radial type blades.

In some embodiments of the invention, the forward curved blade is swept forward in the air intake direction.

In some embodiments of the invention, the backward curved blade profile is swept forward in the air intake direction.

A second aspect of the invention proposes an axial flow fan comprising an impeller as described in any of the embodiments above.

A third aspect of the present invention proposes a cooking appliance comprising an axial flow fan as described above.

In some embodiments of the present invention, the cooking appliance is selectively configured as any one of an electric cooker, an air fryer, an electric oven, an electric steamer, a microwave oven, a micro-baking all-in-one machine, a micro-steaming all-in-one machine, and a micro-steaming and baking all-in-one machine.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 schematically shows a structural view of an impeller of the prior art;

fig. 2 schematically shows a structural view of an axial flow fan in the prior art;

FIG. 3 schematically illustrates a front view of an impeller according to one embodiment of the invention;

FIG. 4 is a cross-sectional view of the impeller shown in FIG. 3;

fig. 5 is a partial structural view schematically showing that the cooking appliance is an electric rice cooker;

fig. 6 schematically shows a partial structural view of a cooking appliance as a dishwasher;

fig. 7 schematically shows a structural view of the cooking appliance as an air fryer.

The reference numerals are as follows:

10 is an impeller;

101 is a hub;

102 is a blade;

103 is a first measurement of a flow guiding structure, 1031, a second measurement of a flow guiding structure, 1032;

20 is an electric cooker;

201, a 2011 cavity, 2012 an air inlet and 2013 an air outlet;

202 an axial flow fan of the electric cooker;

203 a heating assembly of the electric cooker;

30 is a dishwasher;

301 a housing of a dishwasher, 3011 a dish placement chamber;

302 an axial flow fan of a dishwasher;

303 a heating assembly of a dishwasher;

304 airflow channels;

40 is an air fryer;

401 accommodating cavity, 4011 accommodating space of air fryer;

402 axial fans of the air fryer;

403 heating assembly of the air fryer.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

In the present invention, a number of the present invention is included above a certain number, and specifically, for example, 8 or more include 8.

As shown in fig. 3 and 4, according to an embodiment of the present invention, an impeller 10 is provided as an impeller of an axial flow fan, the impeller 1 includes a hub 101, blades 102 and a flow guiding structure 103, a plurality of blades 12 are annularly arranged on the hub 101, the flow guiding structure 103 is annularly arranged on the radial outer sides of the blades 102, the flow guiding structure 103 is located between the front end of the impeller and the rear end of the impeller, and the flow guiding structure 103 is connected with at least part of the blade tips of the blades 102 to guide the airflow formed when the impeller 102 rotates.

It should be understood that the rear end of the impeller means the end of the air inlet of the impeller when the impeller rotates; the front end of the impeller is the end of the air outlet of the impeller when the impeller rotates.

It should be noted that the number of blades included in the impeller 10 is not particularly limited, and in some embodiments, the number of blades included in the impeller may be set to 2, 3, 4, 5, 6, 7, or 8 or more selectively; in particular embodiments, the plurality of blades is further uniformly distributed around the periphery of the hub. As shown in fig. 3 in particular, the impeller comprises 3 blades, and the 3 blades are uniformly distributed around the periphery of the hub.

In the concrete implementation, the hub is further selectively provided with a cylindrical structure, a plurality of blades are uniformly distributed on the outer side of the cylindrical structure, the center of the hub is provided with a shaft hole, and the driving shaft is connected with the impeller through the shaft hole during installation; in the working process, the driving shaft rotates and drives the impeller to rotate. In particular embodiments, the drive shaft may alternatively be configured as a drive shaft for a motor or as a power take-off shaft for a transmission assembly. In order to increase the strength of the hub, the wall thickness of the cylindrical structure may be further optionally increased and/or reinforcing ribs may be provided on the inner side of the cylindrical structure.

In some embodiments of the invention, the distance between the front end of the impeller and the rear end of the impeller is defined as H, the distance between the rear end of the impeller and the first side 131 of the flow guiding structure is defined as H1, the distance between the front end of the impeller and the second side 132 of the flow guiding structure is defined as H2, the H1 is greater than 0 and less than H, and the H2 is greater than 0 and less than H. It should be noted that the first measurement of the flow guiding structure is that the flow guiding structure is close to one side of the impeller air inlet, and the second measurement of the flow guiding structure is that the flow guiding structure is close to one side of the impeller air outlet.

In some embodiments of the present invention, the flow guiding structure is further selectively configured as a ring structure with a uniform cross section, the width of the flow guiding structure is defined as H3, and h=h1+h2+h3.

It should be noted that, the specific structural form of the flow guiding structure is not limited specifically, and specifically, as shown in fig. 3 and fig. 4, the flow guiding structure is a strip-shaped annular structure with a uniform cross section. In the concrete implementation, the diversion structure meets the mechanical requirements of strength, rigidity and the like in the rotation process, and avoids larger deformation and fracture in the rotation process; in particular by selecting materials that meet the mechanical requirements.

In specific implementation, the value of H1/H is further selectively 0.25 or more and 0.33 or less, and the value of H2/H is 0.14 or more and 0.27 or less. Specifically, the value of H1/H can be selectively set to any one of values 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33; likewise, the values of H2/H can be selectively set to 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27. For example, in the specific implementation, the value of H1/H is set to 0.27, and the value of H2/H is set to 0.21.

The applicant carries out optimal design on the height of the flow guiding structure to obtain the width h3 of the flow guiding structure when the optimal balance point is obtained, and compared with a prototype under the flow guiding structure with the width, the fan air quantity can be improved by 24%, and the fan noise is reduced by 3dB. Therefore, through verification discovery, the air quantity of the fan can be effectively improved and the noise effect of the fan can be reduced by arranging the flow guide structure as defined in the application on the impeller.

As an alternative embodiment, the value of H1/H may be optionally 0.25 or more and 0.33 or less, and the value of H2/H is not particularly limited, and may be less than 0.14 or more than 0.27. For example, in the specific implementation, the value of H1/H is set to 0.31, and the value of H2/H is set to 0.12. In addition, the value of H1/H is not particularly limited, and the value of H1/H may be less than 0.25 or more than 0.33, and the value of H2/H may be 0.14 or more and 0.27 or less. For example, in the practical implementation, the value of H1/H is set to 0.24, and the value of H2/H is set to 0.23. The applicant verifies that although the embodiments cannot achieve the effect as the optimal balance point, the air quantity of the fan can be improved to a certain extent, and the noise of the fan can be reduced.

In some embodiments of the present invention, the flow guiding structure may be further optionally configured as an integrally formed structure, and in a specific implementation, the flow guiding structure is connected to the blade of the impeller; the connection mode of the flow guiding structure and the blade can be selectively realized by at least one connection mode of bonding, clamping and connecting through a connecting piece; of course, in the specific implementation, the connection may be performed by other connection methods, such as welding, riveting, and the like.

It should be noted that, in this embodiment, the connection manner between the flow guiding structure and the blade tip of the impeller is not particularly limited, but the reliability requirement of the connection portion needs to be met, so as to avoid that the blade is separated from the flow guiding structure and an accident occurs when the impeller rotates. Specifically, the flow guiding structure is connected with at least part of the blade tips of the impeller in a connecting mode of bonding, welding, riveting and the like.

As an alternative embodiment, in some embodiments of the present invention, the impeller may also be optionally provided as an integrally formed structure. When the impeller is processed, the hub, the flow guiding structure and the blades which are included in the impeller are integrally formed; specifically, for example, by injection molding, molding by a die casting process, and the like. Of course, other molding modes meeting the requirements can be adopted to realize integral molding; for example using 3D printing molding techniques.

As an alternative embodiment, in some embodiments of the present invention, the guiding structure may further optionally include a plurality of arc-shaped guiding structures, where the guiding structure is formed by splicing a plurality of arc-shaped guiding structures. It should be noted that the number of the arc-shaped guide structural members is not particularly limited, and the number of the arc-shaped guide structural members can be selectively set according to factors such as actual blade shapes, blade setting number, processing technology, installation technology and the like.

In the implementation, a plurality of arc-shaped flow guiding structures can be further and selectively spliced end to form an annular flow guiding structure. The ends of the arc-shaped flow guiding structure can be further and selectively connected in an adhesive mode, and can be also connected in a welding mode or a riveting mode; the clamping position can be arranged at one end of the arc-shaped flow guiding structure, the clamping structure matched with the clamping position is arranged at the other end of the arc-shaped flow guiding structure, and the arc-shaped flow guiding structure is connected with the clamping position in a matched mode during installation.

It should be noted that the splicing manner of the plurality of arc-shaped flow guiding structural members is not particularly limited, and may be any splicing manner capable of meeting the requirements of the splicing process, such as riveting, pinning, and the like.

In this embodiment, the connection mode between the flow guiding structure and the blade tip of the impeller is not particularly limited, but the reliability requirement of the connection part is also required to be met, so as to avoid the separation of the blade and the flow guiding structure and the occurrence of accidents when the impeller rotates. Specifically, the flow guiding structure is connected with at least part of the blade tip of the impeller in a connecting mode such as bonding, welding, riveting and the like.

As an alternative embodiment, in some embodiments of the present invention, at least some of the blades may be optionally provided with an arc-shaped flow guiding structural member, where the blades and the arc-shaped flow guiding structural member are integrally formed, and when a plurality of the blades are fixedly arranged at a set position of the hub, a plurality of the arc-shaped flow guiding structural members are adapted to construct the flow guiding structure.

It should be noted that, the length of the arc-shaped flow guiding structure disposed on the blade is not particularly limited, and may be selectively set in combination with factors such as actual design, production process, production cost, etc. In the specific implementation, the flow guiding structure can be formed by splicing arc-shaped flow guiding structural members arranged on the blades; or alternatively, the impeller comprises an arc-shaped flow guiding structural part which is not integrally formed with the blade, and the flow guiding structure is constructed by the impeller and the arc-shaped flow guiding structural part which is integrally formed with the blade.

In some embodiments of the present invention, the blades included in the impeller may be selectively set to be both front curved blades, or the blades included in the impeller may be set to be both back curved blades, or the blades included in the impeller may be set to be both radial blades.

It should be noted that the specific parameters of the blade are not particularly limited. In the embodiment in which the blades are forward-curved blades, in order to achieve better performance of the impeller, the forward-curved blades may be further specifically disposed forward-swept in the air intake direction; still further optionally, the forward sweep angle α of the forward curved blade is in the range of 20 ° to 30 °. In particular implementations, the forward sweep angle may be 20 °, 21 °, 22 °, 23 °, 24 °, 25 °, 26 °, 27 °, 28 °, 29 °,30 °. According to the air inlet device, the forward-bending type blades are arranged forward in the air inlet direction, so that the impact of air flow and the blades can be effectively reduced, the acting area of the impeller is increased to a certain extent, and larger air quantity is generated in unit time.

Also, when the embodiment in which the blades are back-curved blades is embodied, in order to achieve better performance of the impeller, the back-curved blade may be further specifically disposed forward in the intake direction.

The application also proposes an axial flow fan comprising any one of the impellers mentioned in the previous embodiments, examples. In specific implementation, the axial flow fan further comprises a driving motor, and the impeller is driven by the motor; when the motor is powered, the impeller rotates clockwise or counterclockwise according to a set rotation direction. In specific implementation, the axial flow fan can be used alone or as a component of other equipment. When it is used alone, the axial flow fan may be used as a fan, a ventilator, or the like; when used as part of other equipment, can be used for cooling functional devices selectively or in conjunction with heating assemblies to produce hot air, cold air, e.g., in electric ovens, air fryers, air conditioners, etc.

The application also provides a cooking appliance comprising any one of the axial fans mentioned in the previous embodiments. In specific implementation, the axial flow fan can be matched and set according to the application scene of the axial flow fan; the axial flow fan may be selectively used to provide hot air or the axial flow fan may be selectively used to provide cooling fluid. Further selectively enabling the cooking utensil to be an electric cooker, an air fryer, an electric oven, an electric steam box, a microwave oven, a micro-baking integrated machine, a micro-steaming and baking integrated machine and the like.

As a specific embodiment of the present application, specifically, the cooking appliance is set as an electric cooker, as shown in fig. 5, the electric cooker 20 includes a casing 201, an axial flow fan 202, and a heating component 203, where a cavity 2011 is provided in the casing 201, an air inlet 2012 and an air outlet 2013 are provided on the casing 201, the axial flow fan 202 is fixed in the cavity 2011, and the air inlet 2012 of the axial flow fan 202 is aligned and matched with the air inlet 2012 provided on the casing 201, and the air outlet of the axial flow fan 202 is opposite to the heating component 203. In specific operation, the axial flow fan 202 draws in air flow from outside the housing 201 and blows the air flow toward the heating assembly 203, and the air flow absorbing heat is then discharged from the air outlet 2013; thereby cooling the heating assembly 203. In an implementation, the heating assembly may further be provided as a heating assembly comprising an induction coil. It should be noted that fig. 5 only represents a schematic structure of an electric rice cooker, and does not represent that the electric rice cooker claimed in the present application must be configured according to the structure of fig. 5, and it may be any electric rice cooker that needs to dissipate heat through an axial flow fan. It should be noted that the axial flow fan 202 in the embodiment is configured to include the impeller having the flow guiding structure as described above.

As another specific embodiment of the present application, specifically, the cooking apparatus is configured as a dishwasher, as shown in fig. 6, the dishwasher 30 includes a housing 301, an axial fan 302, a heating assembly 303, and an air flow pipe 304, a dish accommodating cavity 3011 is disposed in the housing 301, the heating assembly 303 is disposed in the air flow pipe 304, the axial fan 302 is disposed upstream of the heating assembly 303, and an air outlet end of the axial fan 302 is connected to the air flow pipe 304; an air inlet and an air outlet are arranged on the shell 301, and the air flow pipeline is connected with the air inlet on the shell 301. As an alternative embodiment, the axial flow fan 302 may also be selectively disposed within the airflow duct 304. The axial flow fan 302 is used for providing air flow in the tableware placing cavity 3011, the heating component 303 is used for heating the air flow provided by the axial flow fan 302, the heated air flow enters the tableware placing cavity 3011 along the air flow pipeline 304, and after the tableware in the tableware placing cavity 3011 is heated and dried, the heated air flow is discharged from the air outlet on the shell 301. It should be noted that fig. 6 represents only a schematic structure of a dishwasher, and does not represent that the dishwasher claimed in the present application must be arranged according to the structure of fig. 6, which may be any dishwasher that needs to provide an air flow by an axial flow fan. It should be noted that the axial flow fan 302 in the embodiment is configured to include the impeller having the flow guiding structure described above.

As another specific embodiment of the present application, specifically, the cooking apparatus is an air fryer, the air fryer 40 includes a accommodating cavity 401, an axial flow fan 402 and a heating component 403, the axial flow fan 402 and the heating component 403 are all disposed in the accommodating cavity 401, and an air inlet end (or an air outlet end) of the axial flow fan 402 is disposed opposite to the heating component 403; in a specific operation, the axial flow fan 402 rotates and generates an air flow, and the generated air flow flows through the heating component 403 to heat, and the heated air flow flows to the heated food and forms circulating hot air, so as to realize a function of heating the food. In the specific implementation, as shown in fig. 7, the heat generating component 402 is disposed at the upper part in the accommodation space 4011 of the accommodation cavity 401, and the axial flow fan 402 is disposed above the heat generating component 403; under the action of the axial flow fan 402, the air flow circulates in the accommodating cavity 401. It should be noted that the axial flow fan 402 in the embodiment is configured to include the impeller having the flow guiding structure as described above.

As other embodiments of the present application, the cooking appliance may also be selectively configured as an electric oven, an electric steamer, a microwave oven, a micro-baking all-in-one machine, a micro-steaming all-in-one machine, or a micro-steaming and baking all-in-one machine. And will not be described in detail herein.

In addition, it should be noted that the axial flow fan can be used in any application scenario meeting the requirements of working conditions, and is not limited to cooking appliances, but can also be applied to devices that need to provide fluid media, such as computers, projectors, air conditioners, refrigerators, range hoods, sterilizing cabinets, dish washers, and the like.

In the description of this specification, the terms "some embodiments," "specific examples," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same implementations or examples. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. An impeller provided as an impeller of an axial flow fan, characterized by comprising:

a hub;

the blades are annularly distributed on the hub;

2. The impeller of claim 1, wherein the impeller is configured to move,

the distance between the front end of the impeller and the rear end of the impeller is defined as H, the distance between the rear end of the impeller and the first side of the flow guiding structure is defined as H1, the distance between the front end of the impeller and the second side of the flow guiding structure is defined as H2, H1 is greater than 0 and less than H, and/or H2 is greater than 0 and less than H.

3. The impeller of claim 2, wherein the impeller is configured to move,

the flow guiding structure is a ring-shaped structure with a uniform cross section, and the width of the flow guiding structure is defined as H3, and h=h1+h2+h3; the value of H1/H is 0.25 or more and 0.33 or less.

4. The impeller of claim 3, wherein the impeller comprises,

the value of H2/H is 0.14 or more and 0.27 or less.

5. The impeller of claim 1, wherein the impeller is configured to move,

the flow guiding structure is arranged as an integrated structure; or,

the impeller is of an integrated structure.

6. The impeller of claim 1, wherein the impeller is configured to move,

the flow guiding structure comprises a plurality of arc-shaped flow guiding structural members, and the flow guiding structure is formed by splicing a plurality of arc-shaped flow guiding structural members; or,

at least part of the blades are provided with arc-shaped flow guide structural members, the blades and the arc-shaped flow guide structural members are integrally formed, and when a plurality of blades are fixedly arranged at the set positions of the hub, a plurality of arc-shaped flow guide structural members are matched to construct the flow guide structure.

7. The impeller according to any one of claims 1 to 6, characterized in that,

the blades included in the impeller are all front bent blade type blades; or,

the blades included in the impeller are all backward bent blade type blades; or,

the blades included in the impeller are all radial blades.

8. The impeller of claim 7, wherein the impeller is configured to move,

the blades included in the impeller are all forward-curved blade type blades, and the forward-curved blade type blades are arranged forward in the air inlet direction.

9. The impeller of claim 8, wherein the impeller comprises a plurality of blades,

the forward sweep angle of the forward bending blade is more than or equal to 20 degrees and less than or equal to 30 degrees.

10. An axial flow fan is characterized in that,

the axial flow fan comprising an impeller according to any one of claims 1 to 9.

11. A cooking appliance is characterized in that,

the cooking appliance comprising the axial flow fan of claim 10.

12. The cooking appliance of claim 11, wherein the cooking appliance further comprises a handle,

the cooking utensil is set as any one of an air fryer, an electric oven, a micro-baking all-in-one machine and a micro-steaming and baking all-in-one machine.