Fan assembly and cooking utensil

Abstract

The fan assembly comprises a first fan and a second fan, the first fan comprises a first hub and a plurality of first blades, and the first blades are connected with the first hub and arranged at intervals in the circumferential direction of the first hub; the diameters of the circumcircles of the first blades are gradually increased in the direction away from the cooking cavity, the second fan and the first fan are coaxial, the second fan is located on the side, facing the cooking cavity, of the first fan, and the diameters of the circumcircles of all the positions of the second fan are equal. The fan assembly has the advantages of being large in air outlet volume and air pressure and high in cooking efficiency of food materials.

Description

Technical Field

[0001] The utility model relates to the technical field of cooking appliances, and particularly relates to a fan assembly and a cooking appliance. Background Art

[0002] An air fryer is a cooking utensil that uses hot air for "frying". The air fryer replaces hot oil with hot air, and forms a circulating heat flow in a closed pot with hot air to cook food materials. At the same time, the hot air can also blow away the moisture on the surface of the food materials, so that the food materials achieve an effect similar to frying.

[0003] In the related art, when the air fryer works, a centrifugal fan is used to realize the circulating flow of gas in the cooking cavity. The bottom of the centrifugal fan is open, and the gas in the cooking cavity enters the centrifugal fan from the bottom opening of the centrifugal fan, and then is blown out from the side of the centrifugal fan and re-enters the cooking cavity, thereby realizing the circulating flow of gas in the cooking cavity. However, this structure with an open bottom of the centrifugal fan easily causes a large amount of local circulating turbulence, that is, part of the air flow blown out from the side of the centrifugal fan does not pass through the cooking cavity and directly enters the centrifugal fan from the bottom opening of the centrifugal fan, resulting in a large loss of wind energy, and further causing a small air volume and air pressure in the cooking cavity, and a low cooking efficiency for food materials. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0005] To this end, an embodiment of the utility model proposes a fan assembly, which has the advantages of large air output volume and air pressure, and high cooking efficiency for food materials.

[0006] An embodiment of the utility model also proposes a cooking appliance.

[0007] The fan assembly of the embodiment of the utility model includes a first fan and a second fan. The first fan includes a first hub and a plurality of first blades. The plurality of first blades are connected to the first hub and are arranged at intervals along the circumferential direction of the first hub. The diameter of the circumscribed circle of the plurality of first blades gradually increases in the direction away from the cooking cavity. The second fan is coaxial with the first fan, the second fan is located on the side of the first fan facing the cooking cavity, and the diameter of the circumscribed circle at each position of the second fan is equal.

[0008] According to the fan assembly of the embodiment of the present utility model, the diameter of the circumcircle of the multiple first blades in the first fan gradually increases in the direction away from the cooking cavity. According to the principle that the larger the diameter of the circumcircle of the blade, the greater the linear velocity of the edge of the blade, and thus the greater the wind speed and the smaller the air pressure generated. When the first fan rotates, a pressure difference is generated at different positions in the axial direction of the first hub at the edge of the first blade, so that the air outlet direction of the first fan is inclined from the radial direction of the first hub towards the direction away from the cooking cavity. The airflow with a small wind speed will flow towards the airflow with a large wind speed. As a result, the air outlet direction of the first fan is inclined from the radial direction of the shaft connection part along the direction away from the cooking cavity, that is, the air outlet airflow of the first fan flows towards the direction away from the first hub and towards the air inlet hole facing the cooking cavity. The air outlet airflow is not easily re-entered into the first hub through the air inlet hole to form local circulating turbulence.

[0009] Meanwhile, a second fan coaxial with the first hub and capable of synchronous rotation is arranged on the side of the first hub facing the cooking cavity, and the diameter of the circumcircle at each position of the second fan is equal. As a result, when the gas in the cooking cavity passes through the second fan, it will be centrifuged by the second fan to form an air outlet airflow flowing radially outward along the second fan. This air outlet airflow further prevents the air outlet airflow of the first fan from re-entering the first hub through the air inlet hole, thereby effectively avoiding the energy loss of the air outlet airflow blown by the first fan. Combined with the auxiliary air outlet of the second fan, the air outlet volume and air pressure of the fan assembly are further improved, and thus the cooking efficiency of the ingredients in the cooking cavity is high.

[0010] Optionally, the second fan includes a shaft connection plate, basic blades, and centrifugal blades. There are multiple basic blades arranged at intervals along the circumferential direction of the shaft connection plate. One end of the basic blade is connected to the outer peripheral edge of the shaft connection plate, and the basic blade is perpendicular to the axial direction of the shaft connection plate; the centrifugal blades correspond to the basic blades one by one, and the centrifugal blades are connected to the corresponding basic blades and are located on the side of the basic blades facing the cooking cavity. The fan assembly of the present utility model is provided with the opening of the second fan facing the cooking cavity, so as to have a better air suction and large air volume air outlet effect. Moreover, the design of the second fan as a centrifugal fan blade makes the manufacturing cost of the fan assembly lower compared with an impeller with a more complex structure.

[0011] Optionally, the first hub is formed around a first accommodation cavity; the fan assembly further includes a third fan, the third fan is arranged in the first accommodation cavity, the third fan is coaxial with the first hub, and the diameter of the circumcircle at each position of the third fan is equal. The fan assembly of the present utility model installs a third fan coaxially connected to the first hub in the first accommodation cavity. The third fan speeds up the flow rate of the gas in the first accommodation cavity, so that the gas is blown out to the cooking cavity by the first fan faster, thereby making the air volume and air pressure in the cooking cavity larger and further improving the cooking efficiency of the ingredients.

[0012] Optionally, the structure of the third fan is the same as that of the second fan. The fan assembly of the utility model sets the diameter of the circumscribed circle at each position of the third fan to be equal. When the third fan rotates, the air inlet in the first accommodating chamber is centrifugally formed into an outlet airflow that flows radially outward along the third fan, which increases the gas flow speed in the first accommodating chamber and increases the air volume and pressure of the first fan. Moreover, there is no need to additionally design the structure of the third fan, which further reduces the manufacturing cost of the fan assembly.

[0013] Optionally, the first hub includes a centrifugal hood, an annular base plate and a connecting sleeve, the inner and outer contours of the centrifugal hood are frustum-shaped, a plurality of the first blades are located in the centrifugal hood and connected to the inner circumference of the centrifugal hood; the outer circumference of the annular base plate is connected to one end of the centrifugal hood adjacent to the cooking cavity, and a plurality of air inlet holes are provided on the annular base plate; the first end of the connecting sleeve is connected to the inner circumference of the annular base plate, and the connecting sleeve is located in the centrifugal hood, and the first fan also includes an axial connection portion, and the axial connection portion is connected to the second end of the connecting sleeve. The fan assembly of the utility model is provided with an annular base plate to close the opening of the first accommodating cavity toward the cooking cavity, and the cooking cavity and the first accommodating cavity are connected through the air inlet hole. Compared with the first annular base plate being provided at one end of the centrifugal hood away from the cooking cavity, the outer diameter of the first annular base plate is smaller and the weight is lighter, which further reduces the manufacturing cost of the first fan. At the same time, the design of the connecting sleeve makes the shaft connecting part connected to the motor shaft of the motor closer to the center of the first fan, so that the distance between the shaft connecting part and the end of the first blade is shorter, and the centrifugal force at the end of the first blade is smaller when the first fan is working, the swing amplitude of the blade is smaller, the noise generated is smaller, and the user experience is higher.

[0014] Optionally, the fan assembly further comprises a motor, the motor body of the motor is located on the side of the first hub away from the second fan, and the motor shaft of the motor is coaxially connected to the first hub and the second fan. The fan assembly of the utility model ensures that the airflow blown out by each of the first fan and the second fan is not interfered by the motor body when flowing toward the cooking cavity, thereby effectively avoiding energy loss in the airflow.

[0015] Optionally, the first hub and the second fan are arranged at intervals along the axial direction of the motor shaft. The fan assembly of the utility model sets the first hub and the second fan to be spaced apart, on the one hand, to ensure that the outlet airflow blown by the second fan blows the outlet airflow blown by the first fan in the radial outward direction of the second fan, avoiding local turbulence at the air inlet of the first fan; on the other hand, it effectively avoids the second fan from abutting against the first hub and blocking the air inlet on the annular substrate, so as to ensure the air volume requirement of the first fan.

[0016] Optionally, the fan assembly further includes a fourth fan, the motor shaft of the motor is connected to the fourth fan, the fourth fan is located between the motor body and the first hub, and the fourth fan blows air towards the motor body. By providing the fourth fan that blows air towards the motor body in the fan assembly of the present utility model, the heat dissipation of the motor can be accelerated, so as to improve the service life of the motor.

[0017] The cooking appliance according to an embodiment of the present utility model includes the fan assembly as described in the above embodiment.

[0018] The technical advantages of the cooking appliance according to an embodiment of the present utility model are the same as those of the fan assembly in the above embodiment, and will not be elaborated here.

[0019] Optionally, the cooking appliance is an air fryer, and the air fryer further includes a lining assembly, a pot body, a heating assembly, and a protective cover. The motor is installed on the lining assembly; the pot body is connected to the lining assembly, the pot body defines a cooking cavity, and the first hub is located on one side of the motor body of the motor facing the cooking cavity; the heating assembly is connected to the lining assembly, and the heating assembly is located in a first accommodation cavity formed by surrounding the first hub; the protective cover is connected to the lining assembly, and a protective cavity is defined between the protective cover and the lining assembly. The protective cavity is separated from the cooking cavity by the protective cover. Both the first fan and the second fan are located in the protective cavity, and the protective cover is provided with air outlet holes. In the cooking appliance of the present utility model, the heating assembly is arranged in the first accommodation cavity. At this time, the airflow generated when the first fan works first penetrates the food ingredients and then enters the first accommodation cavity to impact the heating assembly. The energy loss caused by the impact of the airflow and the heating assembly will not affect the flow rate of the airflow before penetrating the food ingredients, and the penetration of the food ingredients is good. Moreover, the protective cover separates the first fan and the second fan from the cooking cavity, effectively preventing the first fan and the second fan from being exposed, and the use safety of the air fryer is high. Description of the Drawings

[0020] Figure 1 is a cross-sectional view of a cooking appliance according to an embodiment of the present utility model.

[0021] Figure 2 is Figure 1 a partial enlarged view at the first fan.

[0022] Figure 3 is another cross-sectional view of a cooking appliance according to an embodiment of the present utility model.

[0023] Figure 4 is Figure 3 a partial enlarged view at the first fan.

[0024] Figure 5 It is a cross-sectional view of the first fan of the fan assembly according to an embodiment of the present invention.

[0025] Figure 6 It is a cross-sectional view of the second fan of the fan assembly according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. First fan; 11. First hub; 111. Centrifugal air hood; 112. Annular base plate; 1121. Air inlet hole; 113. Connecting sleeve; 12. First blade; 13. Shaft connecting part; 2. Second fan; 21. Shaft connecting plate; 22. Basic blade; 23. Centrifugal blade; 3. Third fan; 4. Motor; 5. Fourth fan; 6. Inner lining assembly; 7. Pot body; 8. Heating assembly; 9. Protective cover; 10. Nut. Detailed implementation manners

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0029] The following will be combined with Figures 1-5 Describe the fan assembly according to an embodiment of the present invention.

[0030] The fan assembly according to an embodiment of the present invention includes a first fan 1 and a second fan 2. The first fan 1 includes a first hub 11 and a plurality of first blades 12. The plurality of first blades 12 are connected to the first hub 11 and are arranged at intervals along the circumferential direction of the first hub 11. The diameter of the circumscribed circle of the plurality of first blades 12 gradually increases in the direction away from the cooking cavity. The second fan 2 is coaxial with the first fan 1. The second fan 2 is located on the side of the first fan 1 facing the cooking cavity. The diameter of the circumscribed circle at each position of the second fan 2 is equal.

[0031] According to the fan assembly of the embodiment of the present utility model, the diameter of the circumscribed circle of the multiple first blades 12 in the first fan 1 gradually increases in the direction away from the cooking cavity. According to the principle that the larger the diameter of the circumscribed circle of the blade, the greater the linear velocity of the edge of the blade, and thus the greater the wind speed and the smaller the air pressure generated. When the first fan 1 rotates, a pressure difference is generated at different positions in the axial direction of the first hub 11 at the edge of the first blade 12, so that the air outlet direction of the first fan 1 is inclined from the radial direction of the first hub 11 towards the direction away from the cooking cavity. The airflow with a small wind speed will flow towards the airflow with a large wind speed. Thus, the air outlet direction of the first fan 1 is inclined from the radial direction of the shaft connection portion 13 towards the direction away from the cooking cavity, that is, the air outlet airflow of the first fan 1 flows towards the direction away from the air inlet hole 1121 of the first hub 11 facing the cooking cavity. The air outlet airflow is not easily re-entered into the first hub 11 through the air inlet hole 1121 to form local circulating turbulence.

[0032] Meanwhile, a second fan 2 coaxial with the first hub 11 and capable of synchronous rotation is arranged on the side of the first hub 11 facing the cooking cavity, and the diameter of the circumscribed circle at each position of the second fan 2 is equal. Thus, when the gas in the cooking cavity passes through the second fan 2, it will be centrifuged by the second fan 2 to form an air outlet airflow flowing radially outward along the second fan 2. This air outlet airflow further prevents the air outlet airflow of the first fan 1 from re-entering the first hub 11 through the air inlet hole 1121. Thus, the energy loss of the air outlet airflow blown by the first fan 1 is effectively avoided. Combining with the auxiliary air outlet of the second fan 2, the air outlet air volume and air pressure of the fan assembly are further improved, and thus the cooking efficiency of the ingredients in the cooking cavity is high.

[0033] It should be noted that the motor shaft of the motor 4 is coaxially connected to each of the first hub 11 and the second fan 2 to achieve the synchronous rotation of the first fan 1 and the second fan 2. In addition, the diameter of the circumscribed circle at each position of the second fan 2 is smaller than the minimum diameter of the circumscribed circle of the multiple first blades 12. At the same time, the diameter of the circumscribed circle at each position of the second fan 2 refers to the diameter of the circumscribed circle of all the blades on the second fan 2.

[0034] In some embodiments, as Figure 6 shown, the second fan 2 includes a shaft connection plate 21, basic blades 22, and centrifugal blades 23. There are multiple basic blades 22 arranged at intervals along the circumferential direction of the shaft connection plate 21. One end of the basic blade 22 is connected to the outer peripheral edge of the shaft connection plate 21, and the basic blade 22 is perpendicular to the axial direction of the shaft connection plate 21. The centrifugal blades 23 correspond to the basic blades 22 one by one, and the centrifugal blades 23 are connected to the corresponding basic blades 22 and are located on the side of the basic blades 22 facing the cooking cavity.

[0035] At this time, the opening of the second fan 2 faces the cooking cavity, so as to have better air suction and large air volume blowing effect. Moreover, the second fan 2 is designed with a centrifugal impeller, which makes the manufacturing cost of the fan assembly lower compared with the more complex structure of the impeller.

[0036] As Figure 6 shown, the thickness directions of the shaft connecting plate 21 and the basic blades 22 are consistent with the axial direction of the first hub 11. A plurality of basic blades 22 are arranged at equal intervals in the circumferential direction of the shaft connecting plate 21, and the centrifugal blades 23 are perpendicular to the corresponding basic blades 22.

[0037] In some embodiments, as Figure 3 and Figure 4 shown, the first hub 11 surrounds and forms a first accommodating cavity. The fan assembly further includes a third fan 3. The third fan 3 is arranged in the first accommodating cavity. The third fan 3 and the first hub 11 are coaxial, and the diameters of the circumscribed circles at each position of the third fan 3 are all equal.

[0038] The rotation of the third fan 3 speeds up the flow rate of the gas in the first accommodating cavity, so that the gas is blown out from the first fan 1 to the cooking cavity faster, thereby making the air volume and air pressure in the cooking cavity larger, and further improving the cooking efficiency of the food ingredients.

[0039] For example, both the third fan 3 and the first fan 1 are coaxially connected to the motor shaft of the motor 4 to realize the synchronous rotation of the third fan 3 and the first fan 1.

[0040] In some embodiments, as Figure 3 and Figure 4 shown, the structure of the third fan 3 is the same as that of the second fan 2.

[0041] That is, the diameters of the circumscribed circles at each position of the third fan 3 are all equal. At this time, when the third fan 3 rotates, the incoming air in the first accommodating cavity is centrifugally formed into an outgoing air flow flowing radially outward along the third fan 3, which not only improves the gas flow rate in the first accommodating cavity, but also improves the outgoing air volume and air pressure of the first fan 1. Moreover, there is no need to design the structure of the third fan 3 additionally, further reducing the manufacturing cost of the fan assembly.

[0042] Exemplarily, both the third fan 3 and the second fan 2 are centrifugal impellers with the same size and the openings both facing the cooking cavity. The third fan 3 is generally located at a position slightly lower than the center of the first accommodating cavity in the height direction.

[0043] In some embodiments, as Figure 5As shown, the first hub 11 includes a centrifugal hood 111, an annular base plate 112 and a connecting sleeve 113. The inner and outer contours of the centrifugal hood 111 are in the shape of a cone, and a plurality of first blades 12 are located in the centrifugal hood 111 and connected to the inner circumference of the centrifugal hood 111. The outer circumference of the annular base plate 112 is connected to one end of the centrifugal hood 111 adjacent to the cooking cavity, and a plurality of air inlet holes 1121 are provided on the annular base plate 112. The first end of the connecting sleeve 113 is connected to the inner circumference of the annular base plate 112, and the connecting sleeve 113 is located in the centrifugal hood 111. The first fan 1 also includes a shaft connecting portion 13, and the shaft connecting portion 13 is connected to the second end of the connecting sleeve 113.

[0044] The annular base plate 112 is arranged to close the opening of the first accommodating cavity toward the cooking cavity, and the cooking cavity and the first accommodating cavity are connected through the air inlet hole 1121. Compared with the arrangement of the first annular base plate 112 at the end of the centrifugal hood 111 away from the cooking cavity, the outer diameter of the first annular base plate 112 is smaller and the weight is lighter, which further reduces the manufacturing cost of the first fan 1. At the same time, the design of the connecting sleeve 113 makes the shaft connecting portion 13 connected to the motor shaft of the motor 4 closer to the center of the first fan 1, thereby the distance between the shaft connecting portion 13 and the end of the first blade 12 is shorter, the centrifugal force at the end of the first blade 12 is smaller when the first fan 1 is working, the swing amplitude of the blade is smaller, the noise generated is smaller, and the user experience is better.

[0045] For example, there are two groups of air inlet holes 1121 and they are arranged at intervals along the radial direction of the annular substrate 112. At this time, the minimum distance between the edge of the air inlet near the outer peripheral edge of the annular substrate 112 and the center of the annular substrate 112 is greater than the radius of the circumscribed circle of each position of the second fan 2.

[0046] In some embodiments, Figure 1 and Figure 3 As shown, the fan assembly further includes a motor 4 , a motor body of the motor 4 is located on a side of the first hub 11 away from the second fan 2 , and a motor shaft of the motor 4 is coaxially connected to the first hub 11 and the second fan 2 .

[0047] By arranging the motor body of the motor 4 to be located on the side of the first hub 11 away from the second fan 2, it is ensured that the airflow blown out by each of the first fan 1 and the second fan 2 is not interfered by the motor body when flowing toward the cooking cavity, thereby effectively avoiding energy loss in the airflow.

[0048] In some embodiments, Figure 1 and Figure 3 As shown, the first hub 11 and the second fan 2 are arranged at intervals along the axial direction of the motor shaft.

[0049] On the one hand, this setting ensures that the outgoing air flow blown by the second fan 2 blows the outgoing air flow blown by the first fan 1 in the radially outward direction of the second fan 2, avoiding local turbulence at the air inlet holes 1121 of the first fan 1. On the other hand, it effectively prevents the second fan 2 from abutting against the first hub 11 and blocking the air inlet holes 1121 on the annular substrate 112, so as to ensure the air suction volume requirement of the first fan 1.

[0050] Exemplarily, as Figure 1 and Figure 2 shown, the motor shaft of the motor 4 sequentially passes through the shaft connection part 13 in the first fan 1, the bushing, and the shaft connection plate 21 in the second fan 2 from top to bottom and is threadedly connected to the nut 10, thereby clamping the bushing between the shaft connection part 13 and the shaft connection plate 21 to space the shaft connection plate 21 from the annular substrate 112 in the height direction.

[0051] In some embodiments, the fan assembly further includes a fourth fan 5. The motor shaft of the motor 4 is connected to the fourth fan 5. The fourth fan 5 is located between the motor body and the first hub 11, and the fourth fan 5 blows air towards the motor body. By providing the fourth fan 5 that blows air towards the motor body, the fan assembly of the present utility model can accelerate the heat dissipation of the motor 4 to improve the service life of the motor 4.

[0052] For example, the fourth fan 5 can be a centrifugal fan or an axial flow fan, and the opening faces the motor body. The present application does not limit this.

[0053] The cooking appliance according to the embodiment of the present utility model includes the fan assembly as described in the above embodiment.

[0054] The technical advantages of the cooking appliance according to the embodiment of the present utility model are the same as those of the fan assembly in the above embodiment, and will not be elaborated here.

[0055] In some embodiments, as Figure 1 and Figure 3 shown, the cooking appliance is an air fryer. The air fryer further includes a lining assembly 6, a pot body 7, a heating assembly 8, and a protective cover 9. The motor 4 is installed on the lining assembly 6. The pot body 7 is connected to the lining assembly 6. The pot body 7 defines a cooking cavity. The first hub 11 is located on the side of the motor body of the motor 4 facing the cooking cavity. The heating assembly 8 is connected to the lining assembly 6. The heating assembly 8 is located in the first accommodation cavity formed by surrounding the first hub 11. The protective cover 9 is connected to the lining assembly 6. A protective cavity is defined between the protective cover 9 and the lining assembly 6. The protective cavity is separated from the cooking cavity by the protective cover 9. Both the first fan 1 and the second fan 2 are located in the protective cavity. The protective cover 9 is provided with air outlet holes.

[0056] The heating component 8 is arranged in the first accommodation cavity. When the first fan 1 operates, the generated air flow first penetrates the food ingredients and then enters the first accommodation cavity to impact the heating component 8. The energy loss caused by the impact of the air flow and the heating component 8 will not affect the flow rate of the air flow before it penetrates the food ingredients, and the penetration of the food ingredients is good. Moreover, the protective cover 9 separates the first fan 1 and the second fan 2 from the cooking cavity, effectively preventing the first fan 1 and the second fan 2 from being exposed, and the safety of using the air fryer is high.

[0057] For example, the inner lining assembly 6 includes a heat insulation plate, and the heat insulation plate is located between the fourth fan 5 and the first fan 1. The heat insulation plate is used to prevent the high-temperature air flow in the cooking cavity from blowing towards the motor 4.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0059] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected with", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0062] In the present utility model, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present utility model.

Claims

1. A fan assembly, characterized in that: include: a first fan (1), the first fan (1) comprising a first hub (11) and a plurality of first blades (12), the plurality of first blades (12) being connected to the first hub (11) and arranged at intervals along the circumference of the first hub (11), the diameter of the circumscribed circle of the plurality of first blades (12) gradually increasing in a direction away from the cooking chamber; A second fan (2), wherein the second fan (2) is coaxial with the first fan (1), the second fan (2) is located on a side of the first fan (1) facing the cooking cavity, and the diameters of the circumscribed circles at various positions of the second fan (2) are all equal.

2. The fan assembly according to claim 1, characterized in that: The second fan (2) comprises: Axle connecting plate (21); A plurality of basic blades (22) are arranged at intervals along the circumference of the shaft connecting plate (21), one end of each basic blade (22) is connected to the outer circumference of the shaft connecting plate (21), and each basic blade (22) is perpendicular to the axial direction of the shaft connecting plate (21); and Centrifugal blades (23), the centrifugal blades (23) corresponding to the basic blades (22) one by one, the centrifugal blades (23) connected to the corresponding basic blades (22) and located on a side of the basic blades (22) facing the cooking cavity.

3. The fan assembly according to claim 1, characterized in that: The first hub (11) is formed around a first accommodating cavity; The fan assembly further comprises a third fan (3), wherein the third fan (3) is arranged in the first accommodating cavity, the third fan (3) is coaxial with the first hub (11), and the diameters of the circumscribed circles at various positions of the third fan (3) are all equal.

4. The fan assembly according to claim 3, characterized in that: The structure of the third fan (3) is the same as that of the second fan (2).

5. The fan assembly according to claim 1, characterized in that The first hub (11) comprises: A centrifugal wind hood (111), wherein the inner and outer contours of the centrifugal wind hood (111) are in the shape of a frustum, and the plurality of first blades (12) are located in the centrifugal wind hood (111) and connected to the inner circumferential surface of the centrifugal wind hood (111); an annular base plate (112), the outer periphery of the annular base plate (112) being connected to an end of the centrifugal air cover (111) adjacent to the cooking cavity, and the annular base plate (112) being provided with a plurality of air inlet holes (1121); A connecting sleeve (113), wherein a first end of the connecting sleeve (113) is connected to an inner circumference of the annular base plate (112), and the connecting sleeve (113) is located in the centrifugal fan cover (111). The first fan (1) further comprises a shaft connecting portion (13), and the shaft connecting portion (13) is connected to a second end of the connecting sleeve (113).

6. The fan assembly according to any one of claims 1 to 5, characterized in that: The fan assembly further comprises a motor (4), a motor body of the motor (4) being located on a side of the first hub (11) facing away from the second fan (2), and a motor shaft of the motor (4) being coaxially connected to the first hub (11) and the second fan (2).

7. The fan assembly according to claim 6, characterized in that The first hub (11) and the second fan (2) are arranged at intervals along the axial direction of the motor shaft.

8. The fan assembly according to claim 6, characterized in that The fan assembly also includes a fourth fan (5), the motor shaft of the motor (4) is connected to the fourth fan (5), the fourth fan (5) is located between the motor body and the first hub (11), and the fourth fan (5) blows air in the direction of the motor body.

9. A cooking utensil, characterized in that: Comprising a fan assembly as claimed in claim 7 or 8.

10. The cooking appliance according to claim 9, characterized in that The cooking appliance is an air fryer, and the air fryer further comprises: A lining assembly (6), wherein the motor (4) is mounted on the lining assembly (6); A pot body (7), the pot body (7) being connected to the lining assembly (6), the pot body (7) defining a cooking cavity, the first hub (11) being located on a side of the motor body of the motor (4) facing the cooking cavity; a heating assembly (8), the heating assembly (8) being connected to the lining assembly (6), the heating assembly (8) being located in a first accommodating cavity formed around the first hub (11); and A protective cover (9), wherein the protective cover (9) is connected to the lining component (6), a protective cavity is defined between the protective cover (9) and the lining component (6), the protective cavity is separated from the cooking cavity by the protective cover (9), the first fan (1) and the second fan (2) are both located in the protective cavity, and the protective cover (9) is provided with an air outlet.

Images