CN222936948U - Fan assembly and cooking appliance - Google Patents

Abstract

The utility model discloses a fan assembly and a cooking appliance, wherein the fan assembly comprises a first fan and a second fan, wherein the first fan comprises a first hub and a plurality of first blades, wherein the plurality of first blades are connected to the first hub and are arranged at intervals along the circumference of the first hub, wherein the diameter of the circumscribed circle of the plurality of first blades gradually increases in a direction away from a cooking cavity, wherein the second fan is coaxial with the first fan, the second fan is located on a 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. The fan assembly provided by the utility model has the advantages of large air volume and air pressure, and high cooking efficiency for food.

Description

Fan assembly and cooking utensil

Technical Field

The utility model relates to the technical field of cooking appliances, in particular to a fan assembly and a cooking appliance.

Background

The air fryer is a cooking appliance for frying by hot air, the hot air replaces hot oil, so that the hot air forms circulating heat flow in a closed pot to cook food, and meanwhile, the hot air can also blow away moisture on the surface layer of the food, so that the food achieves the effect of being approximately fried.

In the related art, an air fryer is operated to circulate air in a cooking chamber by a centrifugal fan. The bottom opening of the centrifugal fan, 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, so that the gas can circularly flow in the cooking cavity. However, the bottom opening structure of the centrifugal fan is easy to cause a large amount of local circulation turbulence, namely, partial 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, so that wind energy loss is large, the air quantity and the air pressure in the cooking cavity are small, and the cooking efficiency of food materials is low.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides a fan assembly, which has the advantages of large air output and air pressure and high cooking efficiency on food materials.

The embodiment of the utility model also provides a cooking appliance.

The fan assembly comprises a first fan and a second fan, wherein the first fan comprises a first hub and a plurality of first blades, the first blades are connected with the first hub and are arranged at intervals along the circumferential direction of the first hub, the diameters of circumscribed circles of the first blades gradually increase towards a direction away from a cooking cavity, the second fan is coaxial with the first fan, the second fan is located on one side, facing the cooking cavity, of the first fan, and the diameters of circumscribed circles of the second fan at all positions are equal.

According to the fan assembly provided by the embodiment of the utility model, the diameters of the circumscribed circles of the plurality of first blades in the first fan are gradually increased along the direction away from the cooking cavity, and according to the principle that the larger the diameters of the circumscribed circles of the blades are, the larger the linear speed of the edges of the blades is, and the larger the wind speed and the smaller the air pressure are generated, when the first fan rotates, the edges of the first blades generate air pressure differences at different positions in the axial direction of the first hub, so that the air outlet direction of the first fan is inclined from the radial direction of the first hub to the direction away from the cooking cavity, and the air flow with small wind speed flows towards the air flow with large wind speed, so that the air outlet direction of the first fan is inclined from the radial direction of the shaft connecting part to the direction away from the cooking cavity, namely, the air outlet air flow of the first fan flows towards the air inlet hole of the first hub towards the cooking cavity, and the air inlet Kong Fu is not easy to enter the first hub to form local circulation turbulence.

Simultaneously, set up at the one side of first wheel hub towards the culinary art chamber and with first wheel hub coaxial line and synchronous pivoted second fan, and the diameter of the circumscribed circle of each position department of second fan is equal, can form the air-out air current that flows outwards along the radial of second fan by the second fan centrifugation when making the gas in the culinary art chamber through the second fan, this air-out air current further prevents the air-out air current of first fan from getting into in the first wheel hub by air inlet Kong Fu, thereby effectively avoid the energy loss of the air-out air current that first fan blown out, combine the auxiliary air-out of second fan, further improved fan assembly's air-out amount and wind pressure, thereby to the culinary art efficiency of culinary art intracavity food material is high.

Optionally, the second fan comprises a shaft connecting plate, basic blades and centrifugal blades, wherein the basic blades are multiple and are arranged at intervals along the circumferential direction of the shaft connecting plate, one end of each basic blade is connected with the peripheral edge of the shaft connecting plate, the basic blades are perpendicular to the axial direction of the shaft connecting plate, the centrifugal blades are in one-to-one correspondence with the basic blades, and the centrifugal blades are connected with the corresponding basic blades and are located on one side of the basic blades facing the cooking cavity. The fan assembly is provided with the opening of the second fan facing the cooking cavity, so that the fan assembly has better air suction and large air quantity air outlet effects. In addition, the second fan is designed as a centrifugal fan blade, and compared with an impeller with a more complex structure, the manufacturing cost of the fan assembly is lower.

Optionally, the first hub surrounds the first accommodating cavity, the fan assembly further comprises a third fan, the third fan is arranged in the first accommodating cavity, the third fan is coaxial with the first hub, and the diameters of circumscribed circles at all positions of the third fan are equal. The fan assembly is arranged in the first accommodating cavity and is coaxially connected with the first hub, the third fan accelerates the flow speed of gas in the first accommodating cavity, so that the gas is blown out from the first fan into the cooking cavity more quickly, the air quantity and the air pressure in the cooking cavity are larger, and the cooking efficiency of food materials is further improved.

Optionally, the third fan has the same structure as the second fan. The diameters of the circumscribed circles at the positions of the third fan are equal, and when the third fan rotates, the air inlet in the first accommodating cavity is centrifugally formed to form the air outlet airflow flowing outwards along the radial direction of the third fan, so that the air flow speed in the first accommodating cavity is improved, and the air outlet volume and the air pressure of the first fan are improved. In addition, the structure of the third fan is not required to be additionally designed, and the manufacturing cost of the fan assembly is further reduced.

Optionally, the first hub comprises a centrifugal fan cover, an annular base plate and a connecting sleeve, the inner outline and the outer outline of the centrifugal fan cover are in a frustum shape, a plurality of first blades are located in the centrifugal fan cover and connected with the inner peripheral surface of the centrifugal fan cover, the outer peripheral edge of the annular base plate is connected with one end, adjacent to the cooking cavity, of the centrifugal fan cover, a plurality of air inlet holes are formed in the annular base plate, the first end of the connecting sleeve is connected with the inner peripheral edge of the annular base plate, the connecting sleeve is located in the centrifugal fan cover, and the first fan further comprises a shaft connecting portion, and the shaft connecting portion is connected with the second end of the connecting sleeve. The fan assembly is provided with the annular base plate to seal the opening of the first accommodating cavity facing the cooking cavity and communicate the cooking cavity with the first accommodating cavity through the air inlet, and compared with the fan assembly in which the first annular base plate is arranged at one end of the centrifugal fan cover far away from the cooking cavity, the outer diameter of the first annular base plate is smaller, the weight is lighter, and the manufacturing cost of the first fan is further reduced. Meanwhile, due to the design of the connecting sleeve, the shaft connecting part used for being connected with the motor shaft of the motor is closer to the center of the first fan, the distance between the shaft connecting part and the tail end of the first blade is shorter, the centrifugal force at the tail end of the first blade is smaller when the first fan works, the swing amplitude of the blade is smaller, the generated noise is smaller, and the user experience is higher.

Optionally, the fan assembly further comprises a motor, wherein the motor body of the motor is located on one side, away from the second fan, of the first hub, and a motor shaft of the motor is coaxially connected with the first hub and the second fan. According to the fan assembly, the motor body of the motor is arranged on one side, away from the second fan, of the first hub, so that the air-out airflow blown out by each of the first fan and the second fan is prevented from being interfered by the motor body when flowing towards the cooking cavity, and further energy loss of the air-out airflow is effectively avoided.

Optionally, the first hub and the second fan are arranged at intervals along the axial direction of the motor shaft. The fan assembly is provided with the first hub and the second fan which are spaced apart, so that on one hand, the air outlet air flow blown by the second fan blows the air outlet air flow blown by the first fan towards the radial outward direction of the second fan, local turbulence at an air inlet of the first fan is avoided, and on the other hand, the second fan is effectively prevented from abutting against the first hub to block the air inlet on the annular substrate, and the air suction quantity requirement on the first fan is guaranteed.

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 toward the motor body. The fan assembly provided by the utility model can accelerate the heat dissipation of the motor by arranging the fourth fan blowing towards the motor body so as to prolong the service life of the motor.

The cooking appliance according to the embodiment of the utility model comprises the fan assembly according to the embodiment.

Technical advantages of the cooking apparatus according to the embodiment of the present utility model are the same as those of the fan assembly of the above embodiment, and will not be described here again.

Optionally, the cooking utensil is an air fryer, the air fryer further comprises a lining component, a pot body, a heating component and a protective cover, the motor is mounted on the lining component, the pot body is connected with the lining component, the pot body defines a cooking cavity, the first hub is located on one side of the motor body of the motor, which faces the cooking cavity, the heating component is connected with the lining component, the heating component is located in a first accommodating cavity formed by the first hub in a surrounding mode, the protective cover is connected with the lining component, a protective cavity is defined between the protective cover and the lining component, the protective cavity is separated from the cooking cavity by the protective cover, the first fan and the second fan are located in the protective cavity, and the protective cover is provided with an air outlet. According to the cooking utensil disclosed by the utility model, the heating component is arranged in the first accommodating cavity, at the moment, the air flow generated by the first fan during working firstly penetrates through the food material and then enters the first accommodating cavity to collide with the heating component, the energy loss caused by collision of the air flow and the heating component does not influence the flow speed before the air flow penetrates through the food material, and the penetrability of the food material is good. Moreover, the first fan and the second fan are separated from the cooking cavity by the protective cover, so that the first fan and the second fan are effectively prevented from being exposed, and the air fryer is high in use safety.

Drawings

Fig. 1 is a sectional view of a cooking appliance according to an embodiment of the present utility model.

Fig. 2 is an enlarged view of a portion of fig. 1 at a first fan.

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

Fig. 4 is an enlarged view of a portion of fig. 3 at the first fan.

Fig. 5 is a cross-sectional view of a first fan of a fan assembly according to an embodiment of the present utility model.

Fig. 6 is a cross-sectional view of a second fan of the fan assembly according to an embodiment of the present utility model.

Reference numerals:

1. The fan comprises a first fan, 11, a first hub, 111, a centrifugal fan cover, 112, an annular base plate, 1121, an air inlet, 113, a connecting sleeve, 12, a first blade, 13, a shaft connecting part, 2, a second fan, 21, a shaft connecting plate, 22, a basic blade, 23, a centrifugal blade, 3, a third fan, 4, a motor, 5, a fourth fan, 6, a lining component, 7, a pot body, 8, a heating component, 9, a protective cover, 10 and a nut.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A fan assembly according to an embodiment of the present utility model is described below with reference to fig. 1-5.

The fan assembly of the embodiment of the present utility model 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 being connected to the first hub 11 and being arranged at intervals along a circumferential direction of the first hub 11, a diameter of an circumscribed circle of the plurality of first blades 12 gradually increasing in a direction away from the cooking chamber. The second fan 2 is coaxial with the first fan 1, the second fan 2 is positioned on one side of the first fan 1 facing the cooking cavity, and the diameters of the circumscribed circles at all positions of the second fan 2 are equal.

According to the fan assembly of the embodiment of the utility model, the diameters of the circumscribed circles of the plurality of first blades 12 in the first fan 1 gradually increase along the direction away from the cooking cavity, according to the principle that the larger the diameters of the circumscribed circles of the blades are, the larger the linear speed of the edges of the blades is, and the larger the wind speed and the smaller the air pressure are generated, when the first fan 1 rotates, the edges of the first blades 12 generate air pressure differences at different positions in the axial direction of the first hub 11, 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 air flow with small wind speed flows towards the air flow with large wind speed, and therefore the air outlet direction of the first fan 1 is inclined from the radial direction of the shaft connecting part 13 towards the cooking cavity, namely, the air outlet air flow of the first fan 1 flows towards the air inlet 1121 away from the first hub 11 towards the cooking cavity, and the air inlet 1121 is not easy to enter the first hub 11 again, and local circulation is formed.

Meanwhile, the second fan 2 which is coaxial with the first hub 11 and can synchronously rotate is arranged on one side of the first hub 11 facing the cooking cavity, and the diameters of circumscribed circles at all positions of the second fan 2 are equal, so that air in the cooking cavity can be centrifugally formed into air-out air flow flowing outwards along the radial direction of the second fan 2 by the second fan 2 when passing through the second fan 2, the air-out air flow further prevents the air-out air flow of the first fan 1 from reentering the first hub 11 through the air inlet 1121, energy loss of the air-out air flow blown out by the first fan 1 is effectively avoided, and the air-out air quantity and air pressure of a fan assembly are further improved by combining auxiliary air-out of the second fan 2, so that the cooking efficiency of food in the cooking cavity is high.

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 synchronous rotation of the first fan 1 and the second fan 2. Further, the diameter of the circumscribed circle at each position of the second fan 2 is smaller than the minimum diameter of the circumscribed circles of the plurality of first blades 12. Meanwhile, 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.

In some embodiments, as shown in fig. 6, the second fan 2 includes a shaft connection plate 21, a base blade 22, and a centrifugal blade 23. The plurality of basic blades 22 are arranged at intervals along the circumferential direction of the shaft connecting plate 21, one end of each basic blade 22 is connected with the outer circumferential edge of the shaft connecting plate 21, and the basic blades 22 are perpendicular to the axial direction of the shaft connecting plate 21. The centrifugal blades 23 are in one-to-one correspondence with the basic blades 22, and the centrifugal blades 23 are connected to the respective basic blades 22 and are located at a side of the basic blades 22 facing the cooking chamber.

The opening of the second fan 2 faces the cooking cavity so as to have better air suction and large air quantity air outlet effects. In addition, the second fan 2 is a centrifugal fan blade, and compared with an impeller with a more complex structure, the manufacturing cost of the fan assembly is lower.

As shown in fig. 6, the thickness direction of the shaft connecting plate 21 and the basic blades 22 coincides 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 respective basic blades 22.

In some embodiments, as shown in fig. 3 and 4, the first hub 11 surrounds the shaped first receiving cavity. The fan assembly further comprises a third fan 3, 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 circumscribed circles at all positions of the third fan 3 are equal.

The rotation of the third fan 3 accelerates the flow speed of the gas in the first accommodating cavity, so that the gas is blown out into the cooking cavity by the first fan 1 more quickly, thereby enabling the air quantity and the air pressure in the cooking cavity to be larger, and further improving the cooking efficiency of the food.

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

In some embodiments, as shown in fig. 3 and 4, the structure of the third fan 3 is the same as that of the second fan 2.

That is, the diameters of the circumscribed circles at the positions of the third fan 3 are equal, and at this time, when the third fan 3 rotates, the air inlet in the first accommodating cavity is centrifugally formed to form the air outlet airflow flowing outwards along the radial direction of the third fan 3, so that the air flow speed in the first accommodating cavity is improved, and the air outlet volume and the air pressure of the first fan 1 are improved. In addition, the structure of the third fan 3 is not required to be additionally designed, and the manufacturing cost of the fan assembly is further reduced.

The third fan 3 and the second fan 2 are centrifugal fan blades with the same size and openings facing the cooking cavity, and the third fan 3 is located at a position substantially below the center of the first accommodating cavity in the height direction.

In some embodiments, as shown in fig. 5, the first hub 11 includes a centrifugal fan housing 111, an annular base plate 112, and a connection sleeve 113. The centrifugal fan housing 111 has an inner and outer contour of a truncated cone, and a plurality of first blades 12 are positioned in the centrifugal fan housing 111 and connected to an inner peripheral surface of the centrifugal fan housing 111. The outer peripheral edge of the annular base plate 112 is connected to one end of the centrifugal fan cover 111 adjacent to the cooking cavity, and a plurality of air inlet holes 1121 are formed in the annular base plate 112. The first end of the connection sleeve 113 is connected to the inner peripheral edge of the annular base plate 112, the connection sleeve 113 is located in the centrifugal fan housing 111, the first fan 1 further comprises a shaft connection portion 13, and the shaft connection portion 13 is connected to the second end of the connection sleeve 113.

Set up annular base plate 112 and seal the opening of first holding chamber towards the culinary art chamber to through fresh air inlet 1121 intercommunication culinary art chamber and first holding chamber, compare in setting up first annular base plate 112 in centrifugal fan housing 111 keep away from the one end of culinary art chamber, the external diameter of first annular base plate 112 is littleer this moment, and weight is lighter, has further reduced the cost of manufacture of first fan 1. Meanwhile, the design of the connecting sleeve 113 enables the shaft connecting part 13 for connecting with the motor shaft of the motor 4 to be closer to the center of the first fan 1, so that the distance between the shaft connecting part 13 and the tail end of the first blade 12 is shorter, the centrifugal force at the tail end of the first blade 12 is smaller when the first fan 1 works, the swing amplitude of the blade is smaller, the generated noise is smaller, and the user experience is higher.

Illustratively, the air inlet holes 1121 are arranged in two groups and spaced apart along the radial direction of the annular base plate 112, and at this time, the minimum distance between the edge of the air inlet near the outer periphery of the annular base plate 112 and the center of the annular base plate 112 is greater than the radius of the circumscribed circle of each position of the second fan 2.

In some embodiments, as shown in fig. 1 and 3, the fan assembly further includes a motor 4, wherein the motor body of the motor 4 is located on a side of the first hub 11 facing away from the second fan 2, and the motor shaft of the motor 4 is coaxially connected with the first hub 11 and the second fan 2.

Through setting up motor 4's motor body and being located the one side that first wheel hub 11 deviates from second fan 2, guarantee that the air-out air current that each of first fan 1 and second fan 2 blown out is not interfered by motor body when flowing towards the culinary art chamber, and then effectively avoid the air-out air current to appear energy loss.

In some embodiments, as shown in fig. 1 and 3, the first hub 11 and the second fan 2 are arranged at intervals along the axial direction of the motor shaft.

This arrangement ensures, on the one hand, that the air-out air flow blown out by the second fan 2 blows the air-out air flow blown out by the first fan 1 in the radially outward direction of the second fan 2, avoiding local turbulence at the air inlet 1121 of the first fan 1. On the other hand, the second fan 2 is effectively prevented from abutting against the first hub 11 to block the air inlet 1121 on the annular base plate 112, so as to ensure the air suction quantity requirement on the first fan 1.

Illustratively, as shown in fig. 1 and 2, the motor shaft of the motor 4 passes through the shaft connection portion 13 in the first fan 1, the bushing, and the shaft connection plate 21 in the second fan 2 in this order from top to bottom and is screwed to the nut 10, thereby sandwiching the bushing between the shaft connection portion 13 and the shaft connection plate 21 so that the shaft connection plate 21 is spaced apart from the annular base plate 112 in the height direction.

In some embodiments, the fan assembly further comprises 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. The fan assembly of the utility model can accelerate the heat dissipation of the motor 4 by arranging the fourth fan 5 blowing towards the motor body so as to prolong the service life of the motor 4.

For example, the fourth fan 5 may be a centrifugal fan or an axial fan, and the opening is toward the motor body, which is not limited in the present application.

The cooking appliance according to the embodiment of the utility model comprises the fan assembly according to the embodiment.

Technical advantages of the cooking apparatus according to the embodiment of the present utility model are the same as those of the fan assembly of the above embodiment, and will not be described here again.

In some embodiments, as shown in fig. 1 and 3, the cooking appliance is an air fryer, which further includes a liner assembly 6, a pot 7, a heating assembly 8, and a shield 9, with the motor 4 mounted to the liner assembly 6. The pan body 7 is connected with the inner lining assembly 6, the cooking cavity is limited by the pan body 7, and the first hub 11 is positioned on one side of the motor body of the motor 4 facing the cooking cavity. The heating assembly 8 is connected to the liner assembly 6, and the heating assembly 8 is positioned in a first receiving cavity formed around the first hub 11. The protection casing 9 links to each other with inside lining subassembly 6, and protection casing 9 and inside lining subassembly 6 between prescribe a limit to the protection chamber, and the protection chamber is separated by protection casing 9 and culinary art chamber, and first fan 1 and second fan 2 all are located the protection intracavity, and protection casing 9 is equipped with the apopore.

The heating component 8 is arranged in the first accommodating cavity, and the air flow generated during the operation of the first fan 1 firstly penetrates through the food material and then enters the first accommodating cavity to collide with the heating component 8, so that the energy loss caused by the collision of the air flow and the heating component 8 does not influence the flow speed before the air flow penetrates through the food material, and the penetrability of the food material is good. Moreover, the first fan 1 and the second fan 2 are separated from the cooking cavity by the protective cover 9, so that the first fan 1 and the second fan 2 are effectively prevented from being exposed, and the air fryer is high in use safety.

For example, the liner assembly 6 includes a heat shield between the fourth fan 5 and the first fan 1, the heat shield serving to prevent high temperature air flow in the cooking cavity from being blown toward the motor 4.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a 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 utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interactive relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean 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 utility model. 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.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (10)

1. A fan assembly, comprising: 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 1-5 is characterized in that the fan assembly also includes a motor (4), a motor body of the motor (4) is located on the 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). 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 is 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 appliance, characterized by comprising the fan assembly according to claim 7 or 8. 10. The cooking utensil according to claim 9, characterized in that the cooking utensil 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.