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, the first hub forms a first containing cavity with an opening in one end in a surrounding mode, and the first blades are connected with the first hub and arranged in the circumferential direction of the first hub at intervals. The second fan is located in the first containing cavity and coaxially connected with the first hub. The fan assembly has the advantages of being high 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 the hot air to cook the food. At the same time, the hot air can also blow away the moisture on the surface of the food, so that the ingredients achieve an effect similar to frying.

[0003] In the related art, when the air fryer is working, a centrifugal fan is used to realize the circulating flow of gas in the cooking cavity, so as to realize the circulating heating of the hot air for the ingredients and achieve the effect of cooking food without oil. The blades on the centrifugal fan usually have a certain distance from its central axis, so that the air volume in the central area of the centrifugal fan is small, and the hot air entering this area cannot be quickly pressurized, resulting in a small air volume and air pressure in the cooking cavity and a low cooking efficiency for the ingredients. 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] For this reason, an embodiment of the utility model proposes a fan assembly, which has the advantages of high air outlet volume and air pressure and high cooking efficiency for ingredients.

[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 first hub surrounds and forms a first accommodating cavity with one end open. 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 second fan is located in the first accommodating cavity and is coaxially connected to the first hub.

[0008] According to the fan assembly of the embodiment of the utility model, the first hub surrounds and forms a first accommodating cavity with one end open. At this time, the opening of the first accommodating cavity can be set to face the cooking cavity, so that the gas in the cooking cavity can enter the first accommodating cavity through the opening and discharge the air flow towards the cooking cavity under the centrifugal action of the first blades. By installing the second fan in the first accommodating cavity, when the first fan rotates, the second fan can rotate synchronously with the first fan, and when the second fan rotates, the gas flow rate in the first accommodating cavity can be accelerated, so as to improve the gas suction and discharge speed of the first fan, make the air outlet volume and air pressure of the first fan larger, and thus the cooking efficiency of the ingredients located in the cooking cavity is higher.

[0009] Optionally, the second fan includes a second hub and a plurality of second blades. The second hub surrounds and forms a second accommodation cavity. The openings of both the second accommodation cavity and the first accommodation cavity face the cooking cavity. The plurality of second blades are connected to the second hub and are arranged at intervals along the circumferential direction of the second hub. In the fan assembly of the present utility model, the opening of the second accommodation cavity faces the cooking cavity, so that the gas entering the first accommodation cavity can enter the second accommodation cavity, and under the centrifugal action of the second blades, the air flow is discharged towards the first blades, effectively improving the reliability of the second fan in increasing the air volume and pressure of the gas in the first accommodation cavity.

[0010] Optionally, the diameter of the circumscribed circle of the plurality of first blades gradually decreases in the direction away from the cooking cavity, and / or the diameter of the circumscribed circle of the plurality of second blades gradually decreases in the direction away from the cooking cavity. In the fan assembly of the present utility model, by setting the diameter of the circumscribed circle of the plurality of first blades to gradually decrease in the direction away from the cooking cavity, when the first fan rotates, a pressure difference is generated at different positions in the axial direction of the first hub at the edges of the first blades. The air flow with a small wind speed will flow towards the air flow with a large wind speed, thereby making the air outlet direction of the first fan inclined from the radial direction of the first hub towards the cooking cavity. Taking the first fan located above the cooking cavity as an example, at this time, the air flow of the first fan blows obliquely downward into the cooking cavity, thereby reducing the angle between the air outlet direction of the first fan and the inner wall of the cooking cavity, making the energy loss caused by the air flow colliding with the inner wall of the cooking cavity lower, the flow speed of the air flow in the cooking cavity larger, and the cooking efficiency of the food higher. And / or, by setting the diameter of the circumscribed circle of the plurality of second blades to gradually decrease in the direction away from the cooking cavity, the air flow of the second fan also blows obliquely downward towards the first blades, so that the gas flow rate near the cooking cavity in the first accommodation cavity is faster, and then the air flow rate at the lower end of the outer edge of the first fan is faster, the downward inclination angle of the air flow of the first fan is larger, and the energy loss caused by the collision with the inner wall of the cooking cavity is smaller, thereby having a higher cooking efficiency for the food materials.

[0011] Optionally, the opening of the first accommodation cavity faces the cooking cavity. The second fan includes a shaft connection plate and a plurality of third blades. The plurality of third blades are arranged at intervals along the circumferential direction of the shaft connection plate. The third blade includes a basic blade and a centrifugal blade that are connected and angled. One end of the basic blade is connected to the outer peripheral edge of the shaft connection plate, and the centrifugal blade is located on the side of the basic blade facing the cooking cavity. In the fan assembly of the present utility model, the second fan is set as a centrifugal fan blade, and there is no need to set a hub, which can increase the gas flow rate in the first accommodation cavity and effectively reduce the manufacturing cost of the fan assembly.

[0012] Optionally, the first hub includes a centrifugal air shroud, an annular base plate, and a connecting sleeve. The inner and outer contours of the centrifugal air shroud are cylindrical or frustum-shaped. A plurality of the first blades are located inside the centrifugal air shroud and are connected to the inner peripheral surface of the centrifugal air shroud. The outer peripheral edge of the annular base plate is connected to one end of the centrifugal air shroud away from the cooking chamber. The first end of the connecting sleeve is connected to the inner peripheral edge of the annular base plate. The connecting sleeve is located inside the centrifugal air shroud. The first fan further includes a shaft connecting portion, and the shaft connecting portion is connected to the second end of the connecting sleeve. In the fan assembly of the present utility model, the shaft connecting portion is arranged inside the first accommodation chamber, which not only facilitates the coaxial connection of the second fan and the first fan, but also makes the distance between the shaft connecting portion and the end of the first blade shorter. When the first fan operates, the centrifugal force at the end of the first blade is smaller, the swing amplitude of the blade is smaller, the generated noise is smaller, and the user experience is higher.

[0013] Optionally, the second fan is connected to the shaft connecting portion; alternatively, the outer diameter of the connecting sleeve gradually increases in the direction away from the cooking chamber. The second fan is formed with a conical cavity with an opening facing away from the cooking chamber, and a part of the connecting sleeve is fitted inside the conical cavity, and the outer peripheral surface of the connecting sleeve is in close contact with the inner peripheral surface of the conical cavity. The fan assembly of the present utility model can directly connect the second fan and the shaft connecting portion to achieve coaxial connection with the first fan, or can be sleeved on the connecting sleeve through the conical cavity, and then the inner peripheral surface of the conical cavity is pressed against the outer peripheral surface of the connecting sleeve through a fastener to achieve coaxial connection with the first fan. Thus, the installation of the second fan inside the first accommodation chamber is convenient and reliable.

[0014] Optionally, the fan assembly further includes a motor. The motor body of the motor is located on the side of the first hub away from the cooking chamber, and the motor shaft of the motor is coaxially connected to the first hub and the second fan. In the fan assembly of the present utility model, by arranging the motor body of the motor on the side of the first hub away from the cooking chamber, it is ensured that when the air flow blown out by each of the first fan and the second fan flows towards the cooking chamber, it is not interfered by the motor body, thereby effectively avoiding energy loss of the air flow.

[0015] Optionally, the fan assembly further includes a third fan. The motor shaft of the motor is connected to the third fan. The third fan is located between the motor body and the first hub, and the third fan blows air towards the motor body. In the fan assembly of the present utility model, by arranging the third fan that blows air towards the motor body, the heat dissipation of the motor can be accelerated to improve the service life of the motor.

[0016] The cooking appliance according to an embodiment of the present utility model includes the fan assembly as described in any of the above embodiments.

[0017] The technical advantages of the cooking appliance according to the embodiments of the present invention are the same as those of the fan assembly in the above embodiments, and will not be elaborated here.

[0018] 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, and the pot body defines a cooking cavity. The first hub is located on the 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 on the side of the first hub away from the motor body of the motor; 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. The first fan and the second fan are both located in the protective cavity, and the protective cover is provided with air outlet holes. In the cooking appliance of the present invention, the heating assembly is arranged on the side of the first hub away from the motor, that is, the heating assembly is located on the air inlet side of each of the first fan and the second fan instead of on the air outlet side of each of the first fan and the second fan. At this time, the airflow generated when the first fan and the second fan work first penetrates the food and then impacts the heating assembly. The energy loss caused by the airflow impacting the heating assembly will not affect the flow rate of the airflow before penetrating the food, and the penetration of the food 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 air fryer has high use safety. Description of the Drawings

[0019] Figure 1 is a cross-sectional view of an air fryer according to an embodiment of the present invention.

[0020] Figure 2 is Figure 1 enlarged view A of

[0021] Figure 3 is a schematic diagram of the first fan in the fan assembly according to an embodiment of the present invention.

[0022] Figure 4 is an exploded view of the first fan and the second fan in the fan assembly according to an embodiment of the present invention.

[0023] Figure 5 is another exploded view of the first fan and the second fan in the fan assembly according to an embodiment of the present invention.

[0024] Reference Signs:

[0025] 1. First fan; 11. First hub; 111. Centrifugal air hood; 112. Annular substrate; 113. Connecting sleeve; 12. First blade; 13. Shaft connecting part; 2. Second fan; 21. Second hub; 211. Conical cavity; 22. Second blade; 23. Shaft connecting plate; 24. Third blade; 241. Basic blade; 242. Centrifugal blade; 3. Motor; 4. Third fan; 5. Lining assembly; 6. Pot body; 7. Heating assembly; 8. Protective cover; 9. Bushing; 10. Nut. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0027] The following will be combined with Figures 1-5 Describe the fan assembly according to the embodiments of the present utility model.

[0028] 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 first hub 11 surrounds and forms a first accommodation cavity with one end open. 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 second fan 2 is located in the first accommodation cavity, and the second fan 2 is coaxially connected to the first hub 11.

[0029] For the fan assembly according to the embodiment of the present utility model, the first hub 11 surrounds and forms a first accommodation cavity with one end open. At this time, the opening of the first accommodation cavity can be arranged to face the cooking cavity, so that the gas in the cooking cavity can enter the first accommodation cavity from the opening and be discharged out of the air flow towards the cooking cavity under the centrifugal action of the first blades 12. By installing the second fan 2 in the first accommodation cavity, when the first fan 1 rotates, the second fan 2 can rotate synchronously with the first fan 1, and when the second fan 2 rotates, the gas flow speed in the first accommodation cavity can be increased, so as to improve the gas suction and discharge speed of the first fan 1, make the air volume and air pressure of the air outlet of the first fan 1 larger, and thus the cooking efficiency of the food in the cooking cavity is higher.

[0030] It should be noted that the plurality of first blades 12 are located in the first accommodation cavity and are arranged at equal intervals along the circumferential direction of the first hub 11, and the width of the first blade 12 at any position along its extending direction is equal.

[0031] In some embodiments, such as Figure 1 and Figure 2As shown, the second fan 2 includes a second hub 21 and a plurality of second blades 22. The second hub 21 surrounds and forms a second accommodation cavity. The openings of the second accommodation cavity and the first accommodation cavity both face the cooking cavity. The plurality of second blades 22 are connected to the second hub 21 and are arranged at intervals along the circumferential direction of the second hub 21.

[0032] That is, the opening of the second accommodation cavity faces the cooking cavity, so that the gas entering the first accommodation cavity can enter the second accommodation cavity, and under the centrifugal action of the second blades 22, the air flow is discharged towards the first blades 12, effectively improving the reliability of the second fan 2 in increasing the air volume and pressure of the gas in the first accommodation cavity.

[0033] Exemplarily, the second blades 22 are located in the accommodation cavity formed by surrounding the second hub 21, and the plurality of second blades 22 are arranged at equal intervals along the circumferential direction of the second hub 21.

[0034] In some embodiments, as Figures 1-4 shown, the diameter of the circumscribed circle of the plurality of first blades 12 gradually decreases in the direction away from the cooking cavity, and / or the diameter of the circumscribed circle of the plurality of second blades 22 gradually decreases in the direction away from the cooking cavity.

[0035] By setting the diameter of the circumscribed circle of the plurality of first blades 12 to gradually decrease in the direction away from the cooking cavity, 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 edges of the first blades 12, and the air flow with a small wind speed will flow towards the air flow with a large wind speed. Thus, the air outlet direction of the first fan 1 is inclined from the radial direction of the first hub 11 towards the cooking cavity. Taking the first fan 1 located above the cooking cavity as an example, at this time, the air outlet air flow of the first fan 1 blows obliquely downward into the cooking cavity, thereby reducing the angle between the air outlet direction of the first fan 1 and the inner wall of the cooking cavity, making the energy loss caused by the air flow colliding with the inner wall of the cooking cavity lower, the flow speed of the air flow in the cooking cavity greater, and the cooking efficiency of the food higher.

[0036] And / or, by setting the diameter of the circumscribed circle of the plurality of second blades 22 to gradually decrease in the direction away from the cooking cavity, the air outlet air flow of the second fan 2 also blows obliquely downward towards the first blades 12, so that the gas flow rate of the gas adjacent to the cooking cavity in the first accommodation cavity is faster. Furthermore, the air flow rate at the lower end of the outer edge of the first fan 1 is faster, the downward inclination angle of the air outlet air flow of the first fan 1 is greater, and the energy loss caused by the collision with the inner wall of the cooking cavity is smaller, thereby resulting in a higher cooking efficiency for the food ingredients.

[0037] In some embodiments, as Figure 5As shown, the opening of the first accommodating cavity faces the cooking cavity. The second fan 2 includes a shaft connecting plate 23 and a plurality of third blades 24. The plurality of third blades 24 are arranged at intervals along the circumferential direction of the shaft connecting plate 23. The third blade 24 includes a basic blade 241 and a centrifugal blade 242 which are connected and angled. One end of the basic blade 241 is connected to the outer periphery of the shaft connecting plate 23, and the centrifugal blade 242 is located on the side of the basic blade 241 facing the cooking cavity.

[0038] That is, the second fan 2 is a centrifugal fan blade, and there is no need to set a hub, which can increase the gas flow rate in the first accommodating cavity and effectively reduce the manufacturing cost of the fan assembly.

[0039] Exemplarily, as Figure 5 shown, the thickness direction of the shaft connecting plate 23 and the basic blade 241 is consistent with the axial direction of the shaft connecting plate 23, and the centrifugal blade 242 is perpendicular to the basic blade 241.

[0040] In some embodiments, as Figure 4 and Figure 5 shown, the first hub 11 includes a centrifugal air hood 111, an annular base plate 112 and a connecting sleeve 113. The inner and outer contours of the centrifugal air hood 111 are cylindrical or frustum-shaped. A plurality of first blades 12 are located inside the centrifugal air hood 111 and are connected to the inner peripheral surface of the centrifugal air hood 111. The outer periphery of the annular base plate 112 is connected to one end of the centrifugal air hood 111 away from the cooking cavity. The first end of the connecting sleeve 113 is connected to the inner periphery of the annular base plate 112. The connecting sleeve 113 is located inside the centrifugal air hood 111. The first fan 1 further includes a shaft connecting portion 13, and the shaft connecting portion 13 is connected to the second end of the connecting sleeve 113.

[0041] The design that the shaft connecting portion 13 is located in the first accommodating cavity not only facilitates the coaxial connection of the second fan 2 and the first fan 1, but also makes the distance between the shaft connecting portion 13 and the end of the first blade 12 shorter. When the first fan 1 works, the centrifugal force at the end of the first blade 12 is smaller, the swing amplitude of the blade is smaller, the generated noise is smaller, and the user experience is higher.

[0042] In addition, the annular base plate 112 is connected to the upper end with a smaller diameter of the centrifugal air hood 111 instead of the lower end with a larger diameter of the centrifugal air hood 111, which not only reduces the size and weight of the annular base plate 112, but also makes the opening size of the lower end of the first accommodating cavity larger, and the difficulty of sucking the gas in the cooking cavity into the first accommodating cavity is lower, and it is less likely to be blocked and cause energy loss.

[0043] In some embodiments, as Figure 5 shown, the second fan 2 is connected to the shaft connecting portion 13. At this time, the shaft connecting portion 13 of the second fan 2 can be welded or connected by threaded parts to the shaft connecting portion 13 to achieve the coaxial connection of the second fan 2 and the first fan 1.

[0044] Alternatively, the outer diameter of the connecting sleeve 113 gradually increases in a direction away from the cooking cavity. The second fan 2 is formed with a conical cavity 211 having an opening facing away from the cooking cavity. Part of the connecting sleeve 113 is fitted in the conical cavity 211, and the outer peripheral surface of the connecting sleeve 113 is in close contact with the inner peripheral surface of the conical cavity 211. At this time, the conical cavity 211 is sleeved on the connecting sleeve 113, and then the inner peripheral surface of the conical cavity 211 is pressed against the outer peripheral surface of the connecting sleeve 113 by a fastener to achieve coaxial connection with the first fan 1, making the installation of the second fan 2 in the first accommodation cavity convenient and reliable.

[0045] Exemplarily, as Figure 2 shown, the motor shaft of the motor 3 sequentially passes through the bushing 9, the second fan 2 and the circumferential connecting portion from top to bottom and is in threaded cooperation with the nut 10 to clamp a part of the connecting sleeve 113 and the formed conical cavity 211 of the second fan 2 between the bushing 9 and the nut 10. Among them, the upper end of the bushing 9 will pass through the heat insulation plate of the inner lining assembly 5 and abut against the third fan 4.

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

[0047] That is, the motor body of the motor 3 is located on a side of the first hub 11 away from the cooking cavity, thereby ensuring that the air flow 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, and thus effectively avoiding energy loss of the air flow.

[0048] At this time, the motor body of the motor 3 is installed in the inner lining assembly 5 and is located above the heat insulation plate.

[0049] In some embodiments, the fan assembly further includes a third fan 4. The motor shaft of the motor 3 is connected to the third fan 4. The third fan 4 is located between the motor body and the first hub 11, and the third fan 4 blows air toward the motor body. By providing the third fan 4 that blows air toward the motor body, the heat dissipation of the motor 3 can be accelerated to improve the service life of the motor 3.

[0050] Exemplarily, the third fan 4 can be a centrifugal fan or an axial flow fan, and the opening faces the motor body. The present application does not limit this.

[0051] The cooking appliance according to an embodiment of the present invention includes the fan assembly as described in any of the above embodiments.

[0052] The technical advantages of the cooking appliance according to an embodiment of the present invention are the same as those of the fan assembly in the above embodiments, and will not be described herein again.

[0053] In some embodiments, asFigure 1 As shown, the cooking appliance is an air fryer, and the air fryer further includes a lining assembly 5, a pot body 6, a heating assembly 7, and a protective cover 8. The motor 3 is installed on the lining assembly 5. The pot body 6 is connected to the lining assembly 5. The pot body 6 defines a cooking cavity. The first hub 11 is located on the side of the motor body of the motor 3 facing the cooking cavity. The heating assembly 7 is connected to the lining assembly 5. The heating assembly 7 is located on the side of the first hub 11 away from the motor body of the motor 3. The protective cover 8 is connected to the lining assembly 5. A protective cavity is defined between the protective cover 8 and the lining assembly 5. The protective cavity is separated from the cooking cavity by the protective cover 8. Both the first fan 1 and the second fan 2 are located in the protective cavity. The protective cover 8 is provided with air outlet holes.

[0054] The heating assembly 7 is arranged on the side of the first hub 11 away from the motor 3, that is, the heating assembly 7 is located on the air inlet side of each of the first fan 1 and the second fan 2 rather than on the air outlet side of each of the first fan 1 and the second fan 2. At this time, the airflow generated when the first fan 1 and the second fan 2 work first penetrates the food and then impacts the heating assembly 7. The energy loss caused by the airflow impacting the heating assembly 7 does not affect the flow rate of the airflow before it penetrates the food, and the penetration of the food is good. Moreover, the protective cover 8 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 air fryer has high use safety.

[0055] For example, a heat insulation plate is located between the third fan 4 and the first fan 1, and the heat insulation plate is used to prevent the high-temperature airflow in the cooking cavity from blowing towards the motor 3.

[0056] In the description of the present invention, it should be understood that 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It 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 to the present invention.

[0057] 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, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or communication with each other; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0059] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may be 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 be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0060] In the present utility model, terms such as "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 descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0061] 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 first hub (11) being formed around a first accommodating cavity with an opening at one end, 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); A second fan (2), the second fan (2) is located in the first accommodating cavity, and the second fan (2) is coaxially connected to the first hub (11).

2. The fan assembly according to claim 1, characterized in that: The second fan (2) comprises a second hub (21) and a plurality of second blades (22); the second hub (21) is formed around a second accommodating cavity; the opening of the second accommodating cavity and the opening of the first accommodating cavity are both facing the cooking cavity; the plurality of second blades (22) are connected to the second hub (21) and are arranged at intervals along the circumference of the second hub (21).

3. The fan assembly according to claim 2, characterized in that: The diameter of the circumscribed circle of the plurality of first blades (12) gradually decreases in the direction away from the cooking cavity, and / or the diameter of the circumscribed circle of the plurality of second blades (22) gradually decreases in the direction away from the cooking cavity.

4. The fan assembly according to claim 1, characterized in that: The opening of the first accommodating cavity faces the cooking cavity. The second fan (2) comprises a shaft connecting plate (23) and a plurality of third blades (24). The plurality of third blades (24) are arranged at intervals along the circumference of the shaft connecting plate (23). The third blades (24) comprise basic blades (241) and centrifugal blades (242) which are connected and angled. One end of the basic blade (241) is connected to the outer circumference of the shaft connecting plate (23), and the centrifugal blade (242) is located on a side of the basic blade (241) facing the cooking cavity.

5. The fan assembly according to claim 1, characterized in that The first hub (11) comprises: A centrifugal air hood (111), wherein the inner and outer contours of the centrifugal air hood (111) are cylindrical or frustum-shaped, and the plurality of first blades (12) are located in the centrifugal air hood (111) and connected to the inner circumferential surface of the centrifugal air hood (111); an annular base plate (112), wherein the outer periphery of the annular base plate (112) is connected to an end of the centrifugal air hood (111) away from the cooking cavity; 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 claim 5, characterized in that: The second fan (2) is connected to the shaft connecting portion (13); Alternatively, the outer diameter of the connecting sleeve (113) gradually increases in a direction away from the cooking cavity, the second fan (2) surrounds a conical cavity (211) having an opening facing away from the cooking cavity, a portion of the connecting sleeve (113) fits within the conical cavity (211), and the outer circumferential surface of the connecting sleeve (113) is in close contact with the inner circumferential surface of the conical cavity (211).

7. The fan assembly according to any one of claims 1 to 6, characterized in that: The fan assembly further comprises a motor (3), the motor body of the motor (3) being located on a side of the first hub (11) away from the cooking cavity, and the motor shaft of the motor (3) being coaxially connected to the first hub (11) and the second fan (2).

8. The fan assembly according to claim 7, characterized in that The fan assembly also includes a third fan (4), the motor shaft of the motor (3) is connected to the third fan (4), the third fan (4) is located between the motor body and the first hub (11), and the third fan (4) 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 component (5), the motor (3) being mounted on the lining component (5); A pot body (6), the pot body (6) being connected to the lining assembly (5), the pot body (6) defining a cooking cavity, the first hub (11) being located on a side of the motor body of the motor (3) facing the cooking cavity; a heating assembly (7), the heating assembly (7) being connected to the lining assembly (5), the heating assembly (7) being located on a side of the first hub (11) away from a motor body of the motor (3); and A protective cover (8), wherein the protective cover (8) is connected to the lining component (5), a protective cavity is defined between the protective cover (8) and the lining component (5), the protective cavity is separated from the cooking cavity by the protective cover (8), the first fan (1) and the second fan (2) are both located in the protective cavity, and the protective cover (8) is provided with an air outlet.

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