CN218542702U - Fan blade and air cooking utensil - Google Patents

Abstract

The utility model discloses a fan blade and air cooking utensil. The fan blade comprises: a shaft connecting portion; the blades are connected to the radial outer side of the shaft connecting portion, each blade is provided with a pressure side for pushing wind, an included angle formed by a molded line tangent line at an inlet of the pressure side and a rotating direction reverse tangent line of the blade at the inlet is an inlet installation angle, an included angle formed by a molded line tangent line at an outlet of the pressure side and a rotating direction reverse tangent line of the blade at the outlet is an outlet installation angle, the value range of the inlet installation angle is 100-136 degrees, and the value range of the outlet installation angle is 88-120 degrees. According to the utility model discloses a fan blade, when the value range of import mounting angle satisfied 100 ~ 136 and the value range of export mounting angle satisfied 88 ~ 120, can improve the air current along the radial and axial flow velocity of fan blade to show the wind speed and the amount of wind that improve the fan blade.

Description

Fan blade and air cooking utensil

Technical Field

The utility model relates to the technical field of household appliances, particularly, relate to a fan blade and air cooking utensil who has this fan blade.

Background

When air cooking appliances such as an air fryer and an oven work, hot air penetrates through food to take away water in the food, and then the food is baked, so that the cooking effect of the air cooking appliances is mainly influenced by the speed and the trend of the air flow, the trend of the air flow is mainly guided by the air duct, the speed of the air flow is mainly influenced by the performance of the fan blades, in the past, many researchers put main attention on the optimization of the air duct, but do not study the fan blades, the fan blades are simple in structure, the work efficiency is very low, the air quantity is very small, and the cooking effect of the air cooking appliances is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. Therefore, the utility model provides a fan blade can show improvement wind speed and the amount of wind.

The utility model also provides an air cooking utensil of having above-mentioned fan blade.

According to the utility model discloses fan blade includes: a shaft connecting portion; the blades are connected to the radial outer side of the shaft connecting portion and provided with a pressure side used for pushing wind, an included angle formed by a molded line tangent line at an inlet of the pressure side and a reverse tangent line of the rotation direction of the blades at the inlet is an inlet installation angle, an included angle formed by a molded line tangent line at an outlet of the pressure side and the reverse tangent line of the rotation direction of the blades at the outlet is an outlet installation angle, the value range of the inlet installation angle is 100-136 degrees, and the value range of the outlet installation angle is 88-120 degrees.

According to the utility model discloses the fan blade, when the value range of import mounting angle satisfied 100 ~ 136 and the value range of export mounting angle satisfied 88 ~ 120, can improve the air current along the radial and axial flow velocity of fan blade to show the wind speed and the amount of wind that improve the fan blade.

According to the utility model discloses a some embodiments, the external diameter of fan blade is D0, the external diameter of hub connection portion is D1, and D1 satisfies the relational expression with D0: D1/D0=0.54 to 0.74.

According to the utility model discloses a some embodiments, the external diameter of fan blade is D0, the thickness of blade is H, and H satisfies the relational expression with D0: H/D0=0.10 to 0.14.

According to some embodiments of the utility model, the blade includes blade body and pushes away the wind face, the blade body with the hub connection portion links to each other, push away the wind face with the blade body links to each other, the blade body with push away contained angle between the wind face and be not less than 90 and be not more than 150, push away the wind face with inject between the blade body and push away the wind channel.

According to some embodiments of the invention, the blade body is perpendicular to the axis of rotation of the fan blade.

According to some embodiments of the utility model, push away the wind face and be close to the one end of hub connection portion is provided with the breach.

According to some embodiments of the invention, the wind pushing surface is a straight surface.

According to the utility model discloses a some embodiments, the windward side is the curved surface, the camber of curved surface with the pressure side camber of blade body is the same.

According to the utility model discloses a some embodiments, follow in the center of fan blade is along radial outside direction, the width of blade body is the increase trend.

According to some embodiments of the utility model, be equipped with the strengthening rib on the blade body, the extending direction of strengthening rib with the extending direction of blade body is the same, just the inner of strengthening rib extends to on the hub connection portion.

According to some embodiments of the invention, the strengthening rib is provided as a groove formed on the blade body.

According to some embodiments of the invention, the number of blades is 9-21.

According to the second aspect of the present invention, the air cooking appliance includes the above-mentioned fan blade and the annular heat pipes, at least one ring of the annular heat pipes is located in the projection of the wind pushing surface of the fan blade facing the first direction; wherein the first direction is a direction in which the loop heat pipe faces a base of the air cooking appliance.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a top view of a fan blade according to an embodiment of the present invention;

fig. 2 is a side view of a fan blade according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a fan blade according to an embodiment of the present invention;

fig. 4 is a front view of an air cooking appliance according to an embodiment of the present invention;

FIG. 5 isbase:Sub>A sectional view A-A of FIG. 4;

fig. 6 is a top view of an air cooking appliance according to an embodiment of the present invention.

Reference numerals:

the air cooking appliance comprises an air cooking appliance 100, fan blades 10, a shaft connecting part 1, a shaft hole 11, blades 2, a blade body 21, a first side 211, a second side 212, a connecting side 213, a wind pushing surface 22, a pressure side 23, reinforcing ribs 24, a notch 25, a main machine 20, a pot body 30 and a handle 301.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "axial," "radial," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically, electrically or otherwise in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

An air cooking appliance 100 having a fan blade 10 according to an embodiment of the present invention is described in detail with reference to fig. 1 to 6.

Referring to fig. 1-3, a fan blade 10 according to an embodiment of the present invention may include: the fan blade comprises a shaft connecting part 1 and a plurality of blades 2, wherein the blades 2 are arranged on the radial outer side of the shaft connecting part 1, the blades 2 are connected with the shaft connecting part 1, the blades 2 are used for guiding airflow to flow along the radial direction of the fan blade 10, the fan blade 10 becomes a centrifugal fan blade, and the pressure on one axial side of the fan blade 10 becomes negative pressure.

Optionally, the plurality of blades 2 may be uniformly distributed along the circumferential direction of the shaft connecting portion 1, so that when the fan blade 10 is applied to a centrifugal fan, the generated wind is uniform, and meanwhile, the manufacturing and processing process of the fan blade 10 may be simplified, and the manufacturing and processing difficulty of the fan blade 10 may be reduced.

In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The blade 2 has a pressure side 23 for pushing wind, an angle formed by a profile tangent at an inlet of the pressure side 23 and a reverse tangent of a rotation direction of the blade 2 at the inlet is an inlet installation angle β 1a, and an angle formed by a profile tangent at an outlet of the pressure side 23 and a reverse tangent of a rotation direction of the blade 2 at the outlet is an outlet installation angle β 2a. As shown in fig. 1, the inlet of the pressure side 23 is point B, an angle formed by the profile tangent of the pressure side 23 at point B and the reverse tangent of the rotation direction of the vane 2 at point B is an inlet installation angle β 1a, the outlet of the pressure side 23 is point C, and an angle formed by the profile tangent at point C and the reverse tangent of the rotation direction of the vane 2 at point C is an outlet installation angle β 2a.

The value range of the inlet installation angle beta 1a is 100-136 degrees, the value range of the outlet installation angle beta 2a is 88-120 degrees, in other words, the beta 1a satisfies the relational expression: beta 1a is more than or equal to 100 degrees and less than or equal to 136 degrees, and beta 2a satisfies the relation: beta 2a is more than or equal to 88 degrees and less than or equal to 120 degrees. The inlet setting angle beta 1a determines the inflow of the gas flow, and the degree of flow disorder of the gas flow is increased when the angle beta 1a is less than 100 degrees or the angle beta 1a is more than 136 degrees. The outlet installation angle beta 2a determines the static pressure capability of the fan blade 10, and when the beta 2a is less than 88 degrees or the beta 2a is more than 120 degrees, the static pressure capability of the fan blade 10 is weakened.

Alternatively, β 1a may be 100 °, 110 °, 120 °, 130 °, 135 °, etc., and β 2a may be 90 °, 95 °, 100 °, 105 °, 110 °, 115 °, 120 °, etc. Of course, β 1a may have other values between 100 ° and 136 °, and β 2a may have other values between 88 ° and 120 °, which are not listed here.

According to the utility model discloses fan blade 10, under the circumstances that 10 rotational speeds of fan blade were confirmed, when beta 1a, beta 2a satisfied 100 not less than beta 1a be less than or equal to 136 and 88 not less than or equal to beta 2a be less than or equal to 120, can improve the air current along the radial and axial velocity of flow of fan blade 10 to show the wind speed and the amount of wind that improve fan blade 10.

In some embodiments of the present invention, referring to fig. 1, the outer diameter of the fan blade 10 is D0, the outer diameter of the shaft connecting portion 1 is D1, and D1 and D0 satisfy the following relation: D1/D0=0.54 to 0.74. When D1/D0 is greater than 0.74, the length of the blade 2 is shorter, which results in a smaller air duct, and thus the airflow flowing along the radial direction of the fan blade 10 is less; when D1/D0 is less than 0.54, the length of the blade 2 is longer, so that the strength of the fan blade 10 is reduced, and the fan blade 10 is easy to deform or break to cause damage.

Alternatively, D1/D0 may be 0.54, 0.58, 0.62, 0.66, 0.7, 0.74, etc. Of course, D1/D0 may be other values between 0.54 and 0.74, which are not listed here.

It should be noted that, in the description of the present invention, the outer diameter of the fan blade 10 refers to the maximum diameter of the circle where the outer edges of all the blades 2 are located, and the outer diameter of the shaft connecting portion 1 refers to the minimum diameter of the circle where the inner edges of all the blades 2 are located.

In some embodiments of the present invention, referring to fig. 1-2, the outer diameter of the fan blade 10 is D0, the thickness of the fan blade 2 is H, and H and D0 satisfy the following relation: H/D0=0.10 to 0.14. When H/D0 is more than 0.14, the thickness of the blade 2 is larger, so that the fan blade 10 is heavier and is not beneficial to lightweight design; when H/D0 is less than 0.10, the thickness of the blade 2 is smaller, so that the air pushing duct is smaller, and the airflow flowing along the radial direction of the fan blade 10 is smaller.

Alternatively, H/D0 may be 0.10, 0.12, 0.14, etc. Of course, H/D0 can also be other values between 0.10 and 0.14, which are not listed here.

It should be noted that, in the description of the present invention, the outer diameter of the fan blade 10 refers to the maximum diameter of the circle where the outer edges of all the blades 2 are located, and the thickness of the blade 2 refers to the maximum dimension of the blade 2 along the direction where the axis of the fan blade 10 is located.

In some embodiments of the present invention, referring to fig. 1 and 3, the blade 2 may include a blade body 21 and a wind pushing surface 22, the blade body 21 is connected to the shaft connecting portion 1, the wind pushing surface 22 is connected to the blade body 21, the wind pushing surface 22 is used for pushing wind, the pressure side 23 is a side where the wind pushing surface 22 is located, an included angle between the blade body 21 and the wind pushing surface 22 is γ, γ is not less than 90 ° and not more than 150 °, in other words, γ satisfies the relationship: gamma is more than or equal to 90 degrees and less than or equal to 150 degrees, and a wind pushing air channel is defined between the wind pushing surface 22 and the blade body 21. When the fan blade 10 is in operation, the rotation direction thereof may be as indicated by an arrow T in fig. 1, that is, clockwise, and when the fan blade 10 rotates, the fan blade has the functions of pushing air and throwing air, so as to throw the air in the air pushing duct out, for example, into the cooking space of the air cooking appliance 100. The thickness H of the blade 2 refers to the sum of the dimension of the wind-pushing surface 22 in the direction along the axis of the blade 10 and the dimension of the blade body 21 in the direction along the axis of the blade 10.

When gamma is larger than 150 degrees, the pushing force of the air pushing surface 22 to the airflow is small, so that the flow of the airflow along the radial direction of the fan blade 10 is small; when gamma is less than 90 degrees, the air pushing duct is narrow, and the airflow flowing along the radial direction of the fan blade 10 is also small.

Alternatively, γ may be 90 °, 100 °, 110 °, 120 °, 130 °, 135 °, 140 °, 150 °, etc. Of course, γ can also be other values between 90 ° and 150 °, which are not listed here.

In some embodiments of the present invention, referring to fig. 1 and 3, one end of the wind pushing surface 22 close to the shaft connecting portion 1 is provided with a notch 25, and the notch 25 may be formed as an oblique angle. Firstly, the gap 25 can play a role of guiding flow along the radial direction of the fan blade 10 so as to improve the wind guiding rate and further improve the cooking efficiency; secondly, the arrangement of the gap 25 reduces the impact force on the wind pushing surface 22 when wind flows in the radial direction, so that the rotation torque of the fan blade 10 is reduced; furthermore, due to the reduction of the impact strength, the impact noise is reduced, and the cooking noise of the whole machine is reduced.

In some embodiments of the present invention, the wind pushing surface 22 is a straight surface, as shown in fig. 2 and fig. 3, the blade body 21 may be flat or substantially flat, and the blade body 21 is perpendicular to the rotation axis of the fan blade 10, which is beneficial to simplifying the manufacturing process of the fan blade 10 and reducing the manufacturing difficulty of the fan blade 10.

Similarly, the wind pushing surface 22 may be a flat plate or a substantially flat plate, which is beneficial to simplifying the manufacturing process of the wind blade 10 and reducing the manufacturing difficulty of the wind blade 10.

In some embodiments of the present invention, the wind pushing surface 22 is a curved surface, and the curvature of the curved surface is the same as the curvature of the pressure side of the blade body 21. The curved wind pushing surface 21 follows the flow path of wind, and the flow guiding efficiency can be effectively improved.

In some embodiments of the present invention, referring to fig. 1, the width of the blade body 21 increases in a direction radially outward from the center of the fan blade 10. Specifically, the blade body 21 has a first side 211, a second side 212, and a connecting side 213, the connecting side 213 connects the outer ends of the first side 211 and the second side 212, the inner end of the first side 211 and the inner end of the second side 212 are both connected to the shaft connecting portion 1, the first side 211 is located on the pressure side 23, the second side 212 is located on the side opposite to the pressure side 23, and the distance between the inner end of the first side 211 and the inner end of the second side 212 is smaller than the length of the connecting side 213.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In some embodiments of the present invention, the blade body 21, the wind pushing surface 22, the shaft connecting portion 1 are integrated into a whole, and the blade 10 may be a sheet metal blade.

In other embodiments of the present invention, the blade body 21 and the wind pushing surface 22 are integrally formed as the blade 2, and the blade 2 is welded and fixed to the shaft connecting portion 1.

In some other embodiments of the present invention, the blade body 21, the wind pushing surface 22 and the shaft connecting portion 1 are all welded and fixed.

In some embodiments of the present invention, as shown in fig. 1 and 3, the blade body 21 is provided with the reinforcing rib 24, the extending direction of the reinforcing rib 24 is the same as the extending direction of the blade body 21, and the reinforcing rib 24 can significantly increase the strength and rigidity of the blade body 21, so that the blade body 21 is not easily deformed or broken. In the utility model discloses in further embodiment, the inner of strengthening rib 24 extends to on the hub connection portion 1, can increase the joint strength of blade body 21 and hub connection portion 1 from this, and fan blade 10 non-deformable or fracture. In the embodiment shown in fig. 1, 3, the reinforcing ribs 24 are configured as arc-shaped ribs.

According to the utility model discloses a some embodiments, strengthening rib 24 sets up to the recess that forms on blade body 21, and direct fashioned mode reduce the cost, owing to there is not structural connection interface, has guaranteed junction intensity simultaneously.

In some embodiments of the present invention, the number of blades 2 is 9 to 21. In other words, the number of blades 2 is N, N = 9-21, for example, in the embodiment shown in fig. 1, 3, the number of blades 2 is 11, i.e. N =11. When the number of the blades 2 is more than 21, the airflow guiding space is reduced, so that the air volume is reduced; when the number of the blades 2 is less than 9, the thrust of the blades 2 to the airflow is reduced, and the air volume is also influenced, so that the air volume is reduced. Alternatively, the number of blades 2 may be 9, 11, 13, 14, 15, 17, 19, 21, etc. Of course, the number of blades 2 may also be other integer values between 9 and 21, which are not listed here.

Compare with the simple structure fan blade among the correlation technique, under the same circumstances of fan blade 10 rotational speed, adopt the utility model discloses fan blade 10 of embodiment can make the average wind speed improve more than 18%, consequently the amount of wind also improves more than 18%.

The following describes a fan blade 10 according to a specific example of the present invention.

The fan blade 10 comprises a shaft connecting part 1 and 11 fan blades 2, wherein the 11 fan blades 2 are connected to the radial outer side of the shaft connecting part 1, the 11 fan blades 2 are uniformly distributed along the circumferential direction of the shaft connecting part 1, an inlet installation angle beta 1a is 120 degrees, an outlet installation angle beta 2a is 110 degrees, the outer diameter of the fan blade 10 is D0, the outer diameter of the shaft connecting part 1 is D1, the thickness of the fan blade 2 is H, D1/D0=0.6, H/D0=0.12, the fan blade 2 comprises a fan blade body 21 and a fan pushing surface 22, and the included angle between the fan blade body 21 and the fan pushing surface 22 is gamma, and gamma =90 degrees.

In some embodiments, the centrifugal fan may include a driving device and the fan blade 10 of the above embodiments, and the driving device is configured to drive the fan blade 10 to rotate.

In some embodiments, the shaft connecting portion 1 of the fan blade 10 is provided with a shaft hole 11, and the shaft hole 11 is used for connecting a driving shaft of a driving device, so that when the driving device rotates, the driving shaft can drive the fan blade 10 to rotate synchronously to accelerate the air flow speed and increase the air volume.

In other embodiments, an intermediate mechanism may be further disposed between the shaft connecting portion 1 of the fan blade 10 and the driving device, so that when the driving device rotates, power is transmitted to the shaft connecting portion 1 through the intermediate mechanism, and the fan blade 10 is driven to rotate synchronously, so as to accelerate the air flow speed and increase the air volume.

Optionally, the intermediate mechanism is a coupling, one end of the coupling is connected with the driving shaft of the driving device, and the other end of the coupling is connected with the shaft connecting part 1 of the fan blade 10. The intermediate mechanism can also comprise a first coupling, a transmission shaft and a second coupling, wherein the first coupling is connected with a driving shaft of the driving device and the transmission shaft, and the second coupling is connected with the transmission shaft and the shaft connecting part 1 of the fan blade 10.

Alternatively, the drive means may be a rotary motor.

In some embodiments, as shown in fig. 4-6, air cooking appliance 100 may be an air fryer comprising main machine 20 and pan body 30, pan body 30 having handle 301, and a user holding handle 301 to install pan body 30 into main machine 20 or remove pan body 30 from main machine 20. The cooking space for cooking food is formed inside the pot body 30, the fan blade 10 of the centrifugal fan is communicated with the cooking space, therefore, when the centrifugal fan works, the fan blade 10 rotates, hot air flows continuously into the cooking space, hot air penetrates through the food, moisture in the food in the cooking space is taken away, the food is baked, and the flowing path of the air flow is in the direction of an arrow shown in fig. 5.

An air duct module, a control module, a heating module and the like can be arranged in the main machine 20, and the control module can be used for controlling the operation of a driving device of the centrifugal fan and can also be used for driving the operation of the heating module.

In other embodiments, air cooking appliance 100 may be an oven having a cooking space therein for cooking food, and centrifugal fan blade 10 is in communication with the cooking space such that when the centrifugal fan is activated, blade 10 rotates to cause a warmer air flow to enter the cooking space to cook the food in the cooking space.

The air fryer or the oven comprises the fan blades and the annular heat pipes, wherein at least one ring of the annular heat pipes is positioned in the projection of the air pushing surface 22 of the fan blades 2 towards the first direction; wherein, the first direction is the direction of the annular heat pipe towards the base of the air cooking utensil. The structural layout mode can make full use of the heat generated by the annular heat pipe, improve the hot air convection effect and further improve the cooking efficiency.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (12)

1. A fan blade, comprising:

a shaft connecting portion;

the blades are connected to the radial outer side of the shaft connecting portion and provided with a pressure side used for pushing wind, an included angle formed by a molded line tangent line at an inlet of the pressure side and a reverse tangent line of the rotation direction of the blades at the inlet is an inlet installation angle, an included angle formed by a molded line tangent line at an outlet of the pressure side and the reverse tangent line of the rotation direction of the blades at the outlet is an outlet installation angle, the value range of the inlet installation angle is 100-136 degrees, and the value range of the outlet installation angle is 88-120 degrees.

2. The fan blade according to claim 1, wherein the outer diameter of the fan blade is D0, the outer diameter of the shaft connecting portion is D1, and the D1 and the D0 satisfy the relation: D1/D0=0.54 to 0.74.

3. The fan blade according to claim 1, wherein the outer diameter of the fan blade is D0, the thickness of the fan blade is H, and the H and D0 satisfy the relation: H/D0=0.10 to 0.14.

4. The fan blade according to any one of claims 1 to 3, wherein the fan blade comprises a fan blade body and a wind pushing surface, the fan blade body is connected with the shaft connecting portion, the wind pushing surface is connected with the fan blade body, an included angle between the fan blade body and the wind pushing surface is not less than 90 degrees and not more than 150 degrees, and a wind pushing air channel is defined between the wind pushing surface and the fan blade body.

5. The fan blade according to claim 4, wherein a notch is provided at one end of the wind pushing surface close to the shaft connecting part.

6. The fan blade according to claim 5, wherein said wind pushing surface is a straight surface.

7. The fan blade according to claim 5, wherein the wind pushing surface is a curved surface having the same curvature as the pressure side of the blade body.

8. The blade of claim 4 wherein the width of the blade body increases in a direction radially outward from the center of the blade.

9. The fan blade according to claim 4, wherein a reinforcing rib is arranged on the blade body, the extending direction of the reinforcing rib is the same as the extending direction of the blade body, and the inner end of the reinforcing rib extends to the shaft connecting part.

10. The fan blade of claim 9, wherein the ribs are configured as grooves formed in the blade body.

11. The fan blade according to any one of claims 1 to 3, wherein the number of the fan blades is 9 to 21.

12. An air cooking appliance, comprising the fan blade of any one of claims 1 to 11 and annular heat pipes, wherein at least one ring of the annular heat pipes is positioned in a projection of a wind pushing surface of the fan blade towards a first direction; wherein the first direction is a direction of the loop heat pipe toward a base of the air cooking appliance.

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