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 blades are connected with the first hub and are arranged at intervals in the circumferential direction of the first hub, the second fan comprises a second hub and a plurality of second blades, and the second blades are arranged at intervals in the circumferential direction of the second hub. The multiple second blades are connected with the second hub and are arranged at intervals in the circumferential direction of the second hub, the first hub and the second hub are coaxial and are arranged in the axial direction of the first hub, and the diameters of the outer tangent circles of the multiple first blades are gradually increased in the direction away from the second hub; the diameters of the circumcircles of the multiple second blades are gradually increased in the direction away from the first hub. The fan assembly has the advantages of being good in food material cooking uniformity and high in cooking efficiency.

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 food reaches 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, so as to realize the circulating heating of the food with hot air and achieve the effect of cooking the food without oil. And the centrifugal fan among them can usually only blow the hot air in the horizontal direction or the obliquely downward direction. This setting makes the flow direction of the hot air in the pot single, and there are defects of poor cooking uniformity of the hot air on the food and low cooking efficiency. 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] Therefore, an embodiment of the utility model provides a fan assembly, which has the advantages of good cooking uniformity of food and high cooking efficiency.

[0006] The embodiment of the utility model also provides 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 second fan includes a second hub and a plurality of second blades. The plurality of second blades are connected to the second hub and are arranged at intervals along the circumferential direction of the second hub. Wherein,

[0008] The first hub and the second hub are coaxial and arranged along the axial 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 second hub. The diameter of the circumscribed circle of the plurality of second blades gradually increases in the direction away from the first hub.

[0009] For the fan assembly according to the embodiment of the present utility model, the diameter of the circumscribed circle of the plurality of first blades in the first fan gradually increases in the direction away from the second hub, and the diameter of the circumscribed circle of the plurality of second blades in the second fan gradually increases in the direction away from the first hub. 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 and the second fan rotate synchronously, the edge of the first blade generates an air pressure difference at different positions in the axial direction of the first hub, and the edge of the second blade generates an air pressure difference at different positions in the axial direction of the first hub. As a result, the air outlet direction of the first fan is inclined from the radial direction of the first hub towards the direction away from the second hub, and the air outlet direction of the second fan is inclined from the radial direction of the second hub towards the direction away from the first hub.

[0010] At this time, taking the case where the fan assembly is installed above the cooking cavity and the first fan is located above the second fan as an example, the first fan and the second fan blow obliquely upward and obliquely downward into the cooking cavity respectively to form air outlet airflows in two directions. As a result, the flow path of the air outlet airflows in the cooking cavity is wider and more uniform, and the cooking uniformity of the food ingredients is better. Moreover, when the above two air outlet airflows flow towards the wall surface of the cooking cavity, they move away from each other, effectively avoiding energy loss caused by their counterflow, thereby effectively ensuring the air volume and air pressure blown towards the food ingredients, and the cooking efficiency of the air outlet airflows on the food ingredients is higher.

[0011] Optionally, the first hub encloses and forms a first accommodating cavity, and the fan assembly further includes a third fan located in the first accommodating cavity. The third fan includes a third hub and a plurality of third blades. The third hub is coaxial with the first hub, and the plurality of third blades are connected to the third hub and arranged at intervals along the circumferential direction of the third hub. The diameter of the circumscribed circle of the plurality of third blades gradually increases in the direction away from the second hub. The fan assembly of the present utility model installs a third fan coaxial with the first hub in the first accommodating cavity. The third fan can rotate synchronously with the first fan. The rotation of the third blades speeds up the flow velocity of the gas in the first accommodating cavity, enabling the gas to be blown out from the first fan into the cooking cavity faster. As a result, the air volume and air pressure in the cooking cavity are greater, further improving the cooking efficiency of the food ingredients. Moreover, the setting that the diameter of the circumscribed circle of the plurality of third blades gradually increases in the direction away from the second hub makes the air outlet direction of the third fan substantially the same as the air outlet direction of the first fan. As a result, the air pressure difference at the edge position of the first blade is further increased, and the air outlet airflow blown obliquely upward by the first fan has a larger angle and is less likely to intersect with the air outlet airflow blown by the second fan, resulting in energy loss.

[0012] Optionally, the second hub surrounds and forms a second receiving cavity. The fan assembly further includes a fourth fan located in the second receiving cavity. The fourth fan includes a fourth hub and a plurality of fourth blades. The fourth hub is coaxial with the second hub. The plurality of fourth blades are connected to the fourth hub and are arranged at intervals along the circumferential direction of the fourth hub. The diameter of the circumscribed circle of the plurality of fourth blades gradually increases in the direction away from the first hub. By installing a fourth fan coaxial with the first hub in the second receiving cavity in the fan assembly of the present utility model, the fourth fan can rotate synchronously with the second fan. The rotation of the fourth blades speeds up the flow rate of the gas in the second receiving cavity, enabling the gas to be blown out of the second fan into 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 ingredients. Moreover, the arrangement that the diameter of the circumscribed circle of the plurality of fourth blades gradually increases in the direction away from the first hub makes the air outlet direction of the fourth fan substantially the same as the air outlet direction of the second fan, thereby further increasing the air pressure difference at the edge position of the second blades. The air outlet airflow blown out by the second fan has a larger downward blowing angle and is less likely to intersect with the air outlet airflow blown out by the first fan, resulting in energy loss. Also, the opening of the receiving cavity formed by surrounding the fourth hub is in the same direction as the opening of the second receiving cavity and both are oriented towards the cooking cavity, facilitating the full inhalation of the airflow in the cooking cavity into the receiving cavity formed by surrounding the fourth hub to effectively meet the large air volume cooking requirements for the ingredients.

[0013] Optionally, the first hub includes a first connecting sleeve located in the first receiving cavity. The outer diameter of the first connecting sleeve gradually decreases in the direction away from the second hub. The third hub surrounds and forms a first tapered cavity with an opening facing the second hub. Part of the first connecting sleeve is fitted in the first tapered cavity, and the outer peripheral surface of the first connecting sleeve is in close contact with the inner peripheral surface of the first tapered cavity. By sleeving the third hub on the first connecting sleeve of the first hub in the fan assembly of the present utility model, so that the outer peripheral surface of the first connecting sleeve is in close contact with the inner peripheral surface of the first tapered cavity, thus either the third hub can be pressed tightly on the first connecting sleeve by a fastener or the inner peripheral surface of the first tapered cavity can be welded to the outer peripheral surface of the first connecting sleeve, making the coaxial connection of the first fan and the third fan convenient and reliable.

[0014] Optionally, the second hub includes a second connecting sleeve located in the second accommodating cavity, and the outer diameter of the second connecting sleeve gradually decreases in a direction away from the first hub; the fourth hub surrounds a second tapered cavity with an opening facing the first hub, and a part of the second connecting sleeve is fitted in the second tapered cavity, and the outer peripheral surface of the second connecting sleeve is in close contact with the inner peripheral surface of the second tapered cavity. The fan assembly of the present invention sleeves the fourth hub on the second connecting sleeve of the second hub, so that the outer peripheral surface of the second connecting sleeve is in close contact with the inner peripheral surface of the second tapered cavity. Thus, the fourth hub can be pressed on the second connecting sleeve by a fastener, or the inner peripheral surface of the first tapered cavity can be welded to the outer peripheral surface of the first connecting sleeve, making the coaxial connection of the second fan and the fourth fan convenient and reliable.

[0015] Optionally, one end of the first hub adjacent to the second hub includes a first annular substrate, and the first end of the second hub adjacent to the first hub includes a second annular substrate, and the first annular substrate and the second annular substrate are welded or connected by fasteners. The fan assembly of the present invention arranges the first annular substrate and the second annular substrate in close contact, which is convenient for welding or detachable connection by fasteners between the two, making the coaxial connection of the first fan and the second fan convenient and reliable, and also ensuring the reliable rotation speed of the two.

[0016] Optionally, the fan assembly further includes a motor, and the motor shaft of the motor is coaxially connected to the first hub and the second hub, and the first hub is located between the motor body of the motor and the second hub. In the fan assembly according to the embodiment of the present invention, by arranging the motor body of the motor on the side of the first hub away from the second hub, it is ensured that the air flow 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 of the air flow.

[0017] Optionally, the fan assembly further includes a fifth fan, and the motor shaft of the motor is connected to the fifth fan. The fifth fan is located between the motor body of the motor and the first hub, and the fifth fan blows air toward the motor body. The fan assembly of the present invention can accelerate the heat dissipation of the motor by arranging the fifth fan that blows air toward the motor body, so as to improve the service life of the motor.

[0018] The cooking appliance according to the embodiment of the present invention includes the fan assembly as described in any one of the above embodiments.

[0019] The technical advantages of the cooking appliance according to the embodiment of the present invention are the same as those of the fan assembly in the above embodiment, and will not be elaborated here.

[0020] 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. Both the first fan and the second fan are 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 second fan 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. 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 on the side of each of the first fan and the second fan 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 rather than 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 ingredients 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 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 air fryer has high use safety. Description of the Drawings

[0021] Figure 1 is a cross-sectional view of an air fryer according to an embodiment of the present utility model.

[0022] Figure 2 is a cross-sectional view of a fan assembly and a protective cover in an air fryer according to an embodiment of the present utility model.

[0023] Figure 3 is a cross-sectional view of a fan assembly according to an embodiment of the present utility model.

[0024] Figure 4 is another cross-sectional view of a fan assembly according to an embodiment of the present utility model.

[0025] Figure 5 is yet another cross-sectional view of a fan assembly according to an embodiment of the present utility model.

[0026] Reference Signs:

[0027] 1. First fan; 11. First hub; 111. First connecting sleeve; 112. First annular substrate; 12. First blade; 2. Second fan; 21. Second hub; 211. Second connecting sleeve; 212. Second annular substrate; 22. Second blade; 3. Third fan; 31. Third hub; 311. First conical cavity; 32. Third blade; 4. Fourth fan; 41. Fourth hub; 411. Second conical cavity; 42. Fourth blade; 5. Motor; 6. Fifth fan; 7. Lining assembly; 8. Pot body; 9. Heating assembly; 10. Protective cover. 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, but should not be construed as limiting the present invention.

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

[0030] The fan assembly according to the embodiments 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 second fan 2 includes a second hub 21 and a plurality of second blades 22. 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.

[0031] Wherein, the first hub 11 and the second hub 21 are coaxial and arranged along the axial 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 second hub 21, and the diameter of the circumscribed circle of the plurality of second blades 22 gradually increases in the direction away from the first hub 11.

[0032] According to the fan assembly of the embodiments of the present invention, the diameter of the circumscribed circle of the plurality of first blades 12 in the first fan 1 gradually increases in the direction away from the second hub 21, and the diameter of the circumscribed circle of the plurality of second blades 22 in the second fan 2 gradually increases in the direction away from the first hub 11. 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 and the second fan 2 rotate synchronously, the edge of the first blade 12 generates an air pressure difference at different positions in the axial direction of the first hub 11, and the edge of the second blade 22 generates an air pressure difference at different positions in the axial direction of the first hub 11. As a result, 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 second hub 21, and the air outlet direction of the second fan 2 is inclined from the radial direction of the second hub 21 towards the direction away from the first hub 11.

[0033] At this time, taking the example that the fan assembly is installed above the cooking cavity and the first fan 1 is located above the second fan 2, the first fan 1 and the second fan 2 blow into the cooking cavity obliquely upward and obliquely downward respectively, so as to form air outlet airflows in two directions. Thereby, the flow path of the air outlet airflow in the cooking cavity is wider and more uniform, and the cooking uniformity of the food materials is better. Moreover, when the above two air outlet airflows flow towards the wall surface of the cooking cavity, they move away from each other, effectively avoiding energy loss caused by their counteracting each other. Thereby, the air volume and air pressure blown towards the food materials are effectively guaranteed, and the cooking efficiency of the air outlet airflow for the food materials is higher.

[0034] It should be noted that a plurality of first blades 12 are arranged at equal intervals along the circumferential direction of the first hub 11, a plurality of second blades 22 are arranged at equal intervals along the circumferential direction of the second hub 21, and the width of each of the first blades 12 and the second blades 22 is the same at each position in its extending direction. In addition, the first fan 1 and the second fan 2 can be coaxially connected to the motor shaft of the motor 5 respectively, or the first fan 1 and the second fan 2 can be coaxially connected first, and then one of them is coaxially connected to the motor shaft of the motor 5. Preferably, the first hub 11 and the second hub 21 are in contact with each other.

[0035] In some embodiments, as Figures 1 - 3 and Figure 5 shown, the first hub 11 encloses and forms a first accommodating cavity. The fan assembly further includes a third fan 3 located in the first accommodating cavity. The third fan 3 includes a third hub 31 and a plurality of third blades 32. The third hub 31 is coaxial with the first hub 11. The plurality of third blades 32 are connected to the third hub 31 and are arranged at intervals along the circumferential direction of the third hub 31. The diameter of the circumscribed circle of the plurality of third blades 32 gradually increases in the direction away from the second hub 21.

[0036] At this time, the third fan 3 can rotate synchronously with the first fan 1. The rotation of the third blades 32 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 into the cooking cavity faster. Thereby, the air volume and air pressure in the cooking cavity are greater, and the cooking efficiency of the food materials is further improved.

[0037] Moreover, the setting that the diameter of the circumscribed circle of the plurality of third blades 32 gradually increases in the direction away from the second hub 21 makes the air outlet direction of the third fan 3 substantially the same as the air outlet direction of the first fan 1. Thereby, the air pressure difference at the edge position of the first blades 12 is further increased, and the air outlet airflow blown out by the first fan 1 has a larger obliquely upward blowing angle and is less likely to intersect with the air outlet airflow blown out by the second fan 2, resulting in energy loss.

[0038] Exemplarily, the first receiving cavity and the third hub 31 are both arranged with their openings facing upward around the formed receiving cavity. The first hub 11 and the third hub 31 both include centrifugal air hoods with frustum-shaped inner and outer contours. The outer diameter of the centrifugal air hood is larger at the top and smaller at the bottom. The first blades 12 and the third blades 32 are respectively located inside the corresponding centrifugal air hoods and are connected to the inner circumferential surfaces of the corresponding centrifugal air hoods.

[0039] In some embodiments, as Figures 1 - 3 shown, the second hub 21 surrounds and forms the second receiving cavity. The fan assembly further includes a fourth fan 4 located inside the second receiving cavity. The fourth fan 4 includes a fourth hub 41 and a plurality of fourth blades 42. The fourth hub 41 is coaxial with the second hub 21. The plurality of fourth blades 42 are connected to the fourth hub 41 and are arranged at intervals along the circumferential direction of the fourth hub 41. The diameter of the circumscribed circle of the plurality of fourth blades 42 gradually increases in the direction away from the first hub 11.

[0040] At this time, the fourth fan 4 can rotate synchronously with the second fan 2. The rotation of the fourth blades 42 speeds up the flow rate of the gas in the second receiving cavity, enabling the gas to be blown out of the second fan 2 into the cooking cavity faster. As a result, the air volume and air pressure in the cooking cavity are greater, further improving the cooking efficiency of the food ingredients.

[0041] Moreover, the arrangement that the diameter of the circumscribed circle of the plurality of fourth blades 42 gradually increases in the direction away from the first hub 11 makes the air outlet direction of the fourth fan 4 substantially the same as the air outlet direction of the second fan 2. As a result, the air pressure difference at the edge position of the second blades 22 is further increased. The air outlet airflow blown out by the second fan 2 has a larger downward oblique blowing angle, is less likely to intersect with the air outlet airflow blown out by the first fan 1 and cause energy loss. Also, the opening of the receiving cavity formed by surrounding the fourth hub 41 is in the same direction as the opening of the second receiving cavity and both face the cooking cavity, facilitating the air flow in the cooking cavity to be fully sucked into the receiving cavity formed by surrounding the fourth hub 41 to effectively meet the large air volume cooking requirements for the food ingredients.

[0042] Exemplarily, both the second hub 21 and the fourth hub 41 include centrifugal air hoods with frustum-shaped inner and outer contours. The outer diameter of the centrifugal air hood is larger at the top and smaller at the bottom. The second blades 22 and the fourth blades 42 are respectively located inside the corresponding centrifugal air hoods and are connected to the inner circumferential surfaces of the corresponding centrifugal air hoods.

[0043] In some embodiments, as Figure 3 shown, the first hub 11 includes a first connecting sleeve 111 located inside the first receiving cavity. The outer diameter of the first connecting sleeve 111 gradually decreases in the direction away from the second hub 21. The third hub 31 surrounds and forms a first tapered cavity 311 with an opening facing the second hub 21. Part of the first connecting sleeve 111 is fitted inside the first tapered cavity 311, and the outer circumferential surface of the first connecting sleeve 111 is in close contact with the inner circumferential surface of the first tapered cavity 311.

[0044] By sleeving the third hub 31 on the first connecting sleeve 111 of the first hub 11, the outer peripheral surface of the first connecting sleeve 111 and the inner peripheral surface of the first tapered cavity 311 are brought into fitting contact. Thus, the third hub 31 can be pressed tightly on the first connecting sleeve 111 by a fastener, or the inner peripheral surface of the first tapered cavity 311 and the outer peripheral surface of the first connecting sleeve 111 can be welded, making the coaxial connection between the first fan 1 and the third fan 3 convenient and reliable.

[0045] Exemplarily, the motor shaft of the motor 5 passes through the bushing, the third fan 3, the first fan 1, and the second fan 2 from top to bottom and is threadedly connected to the nut to press the inner peripheral surface of the first tapered cavity 311 against the outer peripheral surface of the first connecting sleeve 111, realizing the coaxial connection between the first fan 1 and the third fan 3.

[0046] In some embodiments, as Figure 3 shown, the second hub 21 includes a second connecting sleeve 211 located in the second accommodating cavity, and the outer diameter of the second connecting sleeve 211 gradually decreases in a direction away from the first hub 11. The fourth hub 41 surrounds the second tapered cavity 411 with the forming opening facing the first hub 11, and a part of the second connecting sleeve 211 is fitted in the second tapered cavity 411, and the outer peripheral surface of the second connecting sleeve 211 and the inner peripheral surface of the second tapered cavity 411 are in fitting contact.

[0047] By sleeving the fourth hub 41 on the second connecting sleeve 211 of the second hub 21 from bottom to top, the outer peripheral surface of the second connecting sleeve 211 and the inner peripheral surface of the second tapered cavity 411 are brought into fitting contact. Thus, the fourth hub 41 can be pressed tightly on the second connecting sleeve 211 by a fastener, or the inner peripheral surface of the first tapered cavity 311 and the outer peripheral surface of the first connecting sleeve 111 can be welded, making the coaxial connection between the second fan 2 and the fourth fan 4 convenient and reliable.

[0048] Exemplarily, the motor shaft of the motor 5 passes through the bushing, the third fan 3, the first fan 1, the second fan 2, and the fourth fan 4 from top to bottom and is threadedly connected to the nut to press the inner peripheral surface of the second tapered cavity 411 against the outer peripheral surface of the second connecting sleeve 211, realizing the coaxial connection between the second fan 2 and the fourth fan 4.

[0049] In some embodiments, as Figure 3 and Figure 4 shown, one end of the first hub 11 adjacent to the second hub 21 includes a first annular substrate 112, and one end of the second hub 21 adjacent to the first hub 11 includes a second annular substrate 212. The first annular substrate 112 and the second annular substrate 212 are welded or connected by a fastener.

[0050] The first annular substrate 112 and the second annular substrate 212 are in close contact, which facilitates welding or detachable connection of the two by fasteners, so that the coaxial connection of the first fan 1 and the second fan 2 is convenient and reliable, and the reliability of the same speed rotation of the two is also ensured.

[0051] For example, the outer diameter of the first annular substrate 112 is the same as the outer diameter of the second annular substrate 212 , and the first annular substrate 112 and the second annular substrate 212 are connected by three screw members arranged in a triangle.

[0052] In some embodiments, Figure 1 As shown, the fan assembly further includes a motor 5 , a motor shaft of the motor 5 is coaxially connected to the first hub 11 and the second hub 21 , and the first hub 11 is located between the motor body of the motor 5 and the second hub 21 .

[0053] By arranging the motor body of the motor 5 to be located on the side of the first hub 11 away from the second hub 21, 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.

[0054] In some embodiments, Figure 1 As shown, the fan assembly further includes a fifth fan 6, the motor shaft of the motor 5 is connected to the fifth fan 6, the fifth fan 6 is located between the motor body of the motor 5 and the first hub 11, and the fifth fan 6 blows air toward the motor body. By providing the fifth fan 6 blowing air toward the motor body, the heat dissipation of the motor 5 can be accelerated to increase the service life of the motor 5.

[0055] For example, the fifth fan 6 may be a centrifugal fan or an axial flow fan, which is not limited in the present application.

[0056] The cooking appliance according to the embodiment of the present invention comprises a fan assembly as described in any of the above embodiments.

[0057] The technical advantages of the cooking appliance according to the embodiment of the utility model are the same as the technical advantages of the fan assembly of the above-mentioned embodiment, which will not be repeated here.

[0058] In some embodiments, Figure 1As shown in the figure, the cooking appliance is an air fryer, which further includes a lining assembly 7, a pot body 8, a heating assembly 9, and a protective cover 10. The motor 5 is installed on the lining assembly 7. The pot body 8 is connected to the lining assembly 7. The pot body 8 defines a cooking cavity. Both the first fan 1 and the second fan 2 are located on the side of the motor body of the motor 5 facing the cooking cavity. The heating assembly 9 is connected to the lining assembly 7. The heating assembly 9 is located on the side of the second fan 2 away from the motor body of the motor 5. The protective cover 10 is connected to the lining assembly 7. A protective cavity is defined between the protective cover 10 and the lining assembly 7. The protective cavity is separated from the cooking cavity by the protective cover 10. Both the first fan 1 and the second fan 2 are located in the protective cavity. The protective cover 10 is provided with air outlet holes.

[0059] The heating assembly 9 is arranged on the side of each of the first fan 1 and the second fan 2 away from the motor 5, that is, the heating assembly 9 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 collides with the heating assembly 9. The energy loss caused by the collision of the airflow and the heating assembly 9 will not affect the flow rate of the airflow before it penetrates the food, and the penetrability of the food is good.

[0060] Moreover, the protective cover 10 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.

[0061] For example, the lining assembly 7 includes a heat insulation plate, and the heat insulation plate is located between the fifth fan 6 and the first fan 1. The heat insulation plate is used to prevent the high-temperature airflow in the cooking cavity from blowing towards the motor 5.

[0062] 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 cannot be understood as a limitation of the present invention.

[0063] 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 "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0064] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installation", "connection", "coupling", "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 capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of 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.

[0065] 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 indirectly in 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 merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" 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 has a lower horizontal height than the second feature.

[0066] 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.

[0067] 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: The invention comprises a first fan (1) and a second fan (2), wherein the first fan (1) comprises a first hub (11) and a plurality of first blades (12), wherein the plurality of first blades (12) are connected to the first hub (11) and are arranged at intervals along the circumference of the first hub (11), and the second fan (2) comprises a second hub (21) and a plurality of second blades (22), wherein 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), wherein: The first hub (11) and the second hub (21) are coaxial and arranged along the axial direction of the first hub (11); the diameter of the circumscribed circle of the plurality of first blades (12) gradually increases in a direction away from the second hub (21); and the diameter of the circumscribed circle of the plurality of second blades (22) gradually increases in a direction away from the first hub (11).

2. The fan assembly according to claim 1, characterized in that: The first hub (11) is formed around a first accommodating cavity, and the fan assembly further comprises a third fan (3) located in the first accommodating cavity, the third fan (3) comprising a third hub (31) and a plurality of third blades (32), the third hub (31) being coaxial with the first hub (11), the plurality of third blades (32) being connected to the third hub (31) and arranged at intervals along the circumference of the third hub (31), and the diameter of the circumscribed circle of the plurality of third blades (32) gradually increasing in a direction away from the second hub (21).

3. The fan assembly according to claim 2, characterized in that: The second hub (21) is formed around a second accommodating cavity. The fan assembly further comprises a fourth fan (4) located in the second accommodating cavity. The fourth fan (4) comprises a fourth hub (41) and a plurality of fourth blades (42). The fourth hub (41) is coaxial with the second hub (21). The plurality of fourth blades (42) are connected to the fourth hub (41) and are arranged at intervals along the circumference of the fourth hub (41). The diameter of the circumscribed circle of the plurality of fourth blades (42) gradually increases in a direction away from the first hub (11).

4. The fan assembly according to claim 2, characterized in that: The first wheel hub (11) comprises a first connecting sleeve (111) located in the first accommodating cavity, and the outer diameter of the first connecting sleeve (111) gradually decreases in a direction away from the second wheel hub (21); The third hub (31) surrounds a first conical cavity (311) formed with an opening toward the second hub (21), a portion of the first connecting sleeve (111) fits in the first conical cavity (311), and the outer circumferential surface of the first connecting sleeve (111) is in close contact with the inner circumferential surface of the first conical cavity (311).

5. The fan assembly according to claim 3, characterized in that: The second wheel hub (21) comprises a second connecting sleeve (211) located in the second accommodating cavity, and the outer diameter of the second connecting sleeve (211) gradually decreases in a direction away from the first wheel hub (11); The fourth hub (41) surrounds the second conical cavity (411) with a molded opening toward the first hub (11), a portion of the second connecting sleeve (211) fits in the second conical cavity (411), and the outer circumferential surface of the second connecting sleeve (211) is in close contact with the inner circumferential surface of the second conical cavity (411).

6. The fan assembly according to claim 1, characterized in that One end of the first hub (11) adjacent to the second hub (21) comprises a first annular base plate (112), and the first end of the second hub (21) adjacent to the first hub (11) comprises a second annular base plate (212), and the first annular base plate (112) and the second annular base plate (212) are welded or connected by fasteners.

7. The fan assembly according to any one of claims 1 to 6, characterized in that: The fan assembly further comprises a motor (5), wherein a motor shaft of the motor (5) is coaxially connected to the first hub (11) and the second hub (21), and the first hub (11) is located between a motor body of the motor (5) and the second hub (21).

8. The fan assembly according to claim 7, characterized in that The fan assembly also includes a fifth fan (6), the motor shaft of the motor (5) is connected to the fifth fan (6), the fifth fan (6) is located between the motor body of the motor (5) and the first hub (11), and the fifth fan (6) 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 (7), wherein the motor (5) is mounted on the lining assembly (7); A pot body (8), the pot body (8) being connected to the lining assembly (7), the pot body (8) defining a cooking cavity, the first fan (1) and the second fan (2) both being located on a side of the motor body of the motor (5) facing the cooking cavity; a heating component (9), the heating component (9) being connected to the lining component (7), the heating component (9) being located on a side of the second fan (2) away from a motor body of the motor (5); and A protective cover (10), wherein the protective cover (10) is connected to the lining component (7), a protective cavity is defined between the protective cover (10) and the lining component (7), the protective cavity is separated from the cooking cavity by the protective cover (10), the first fan (1) and the second fan (2) are both located in the protective cavity, and the protective cover (10) is provided with an air outlet.

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