CN215077686U - Protective cover for fan and cooking device - Google Patents

Abstract

The utility model provides a protection casing and culinary art device for fan. The middle area of the protective cover for the fan is provided with a plurality of air inlets, the edge area of the protective cover for the fan is provided with a plurality of air outlets, the plurality of air outlets comprise a plurality of first air outlets positioned above the plurality of air inlets and a plurality of second air outlets positioned below the plurality of air inlets, and the total ventilation area of the plurality of first air outlets is smaller than the total ventilation area of the plurality of second air outlets. This can reduce the hot air flow dead zone. Because a plurality of second air outlets are closer to first heater more, and a plurality of first air outlets are kept away from first heater more, and consequently the space temperature at a plurality of second air outlets place is higher, through the total draught area who increases a plurality of second air outlets, can improve hot-blast mobility to can improve the effect of hot-blast convection current, promote the samming performance in the culinary art intracavity, so that being heated of food is comparatively even.

Description

Protective cover for fan and cooking device

Technical Field

The utility model relates to a kitchen appliance's technical field specifically, relates to a protection casing for fan and cooking device who has it.

Background

With the improvement of living standard of people, the attention on cooking is gradually paid. Various cooking devices are gradually moved into the field of vision of users, becoming a standard configuration for kitchens.

An inner container and a heater are generally arranged in the cooking device, the inner container forms a cooking cavity, and the heater is used for heating food in the cooking cavity. Such cooking devices include, for example, ovens or steam ovens. The heater is generally disposed at the periphery of the cooking chamber so that the cooking chamber has a sufficient space to accommodate food to be cooked. This may result in uneven temperature inside the cooking chamber and higher temperatures near the heater. In order to form heat air convection in the cooking cavity and to make the food heated more uniformly, a fan needs to be arranged in the cooking device. Meanwhile, a protective cover fixed on the inner container is required to be arranged, so that the fan is contained between the inner container and the protective cover. Be provided with air intake and air outlet on the safety cover, the fan rotates in order to drive wind and returns to the culinary art intracavity from the culinary art chamber via air intake flow direction fan, through the air outlet on the protection cover to form hot-blast convection current, so that being heated of food is comparatively even.

However, the design of the air inlet and the air outlet of the existing protective cover is unreasonable, so that the hot air convection is still not ideal enough, the temperature field in the cooking cavity is not uniform, the heating of food is still not uniform enough, and the cooking effect is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art at least in part, according to an aspect of the present invention, there is provided a protection cover for a fan. The middle area of the protective cover for the fan is provided with a plurality of air inlets, the edge area of the protective cover for the fan is provided with a plurality of air outlets, the plurality of air outlets comprise a plurality of first air outlets positioned above the plurality of air inlets and a plurality of second air outlets positioned below the plurality of air inlets, and the total ventilation area of the plurality of first air outlets is smaller than the total ventilation area of the plurality of second air outlets.

This protection casing for fan can be used for cooking device, covers on cooking device's fan. Through the effect of fan, wind can be through a plurality of air intakes inhale to the protection casing in, then blow back to the culinary art intracavity that the inner bag of cooking device formed through a plurality of first air outlets and a plurality of second air outlet. The wind that gets into the inner bag spreads out, when the wind blows on the inner bag wall, can reflect the wind that forms the multi-angle. This can reduce the hot air flow dead zone. Under the general condition, cooking device's main heater (for example later mentioned first heater) sets up in the bottom, because a plurality of second air outlets are closer to first heater more, and a plurality of first air outlets are kept away from first heater more, and consequently the space temperature at a plurality of second air outlets place is higher, through the total draught area who increases a plurality of second air outlets, can improve hot-blast mobility, thereby can improve the effect of hot-blast convection current, promote the samming performance in the culinary art intracavity, so that the being heated of food is comparatively even.

Illustratively, each of the plurality of first air outlets and the plurality of second air outlets is an elongated hole. The slot hole can also prevent effectively that debris from being blown into between protection casing and the inner bag by wind under the prerequisite of guaranteeing draught area, plays the effect of grid.

Illustratively, the plurality of first air outlets and the plurality of second air outlets each extend in a vertical direction. Thus, the processing is convenient, the centralized arrangement can be realized, and the space is saved.

Exemplarily, a plurality of air intakes are the heliciform and arrange, and the spiral direction of a plurality of air intakes is unanimous with the direction of rotation of fan. Through the arrangement, the resistance of air inlet can be reduced, so that the air inlet efficiency is improved.

Exemplarily, the plurality of first air outlets include a first sub air outlet and a second sub air outlet respectively located at two sides above the plurality of air inlets, the first sub air outlet and the second sub air outlet are sequentially arranged along a spiral direction of the plurality of air inlets, and a ventilation area of the first sub air outlet is larger than a ventilation area of the second sub air outlet. This may make the temperature field within the cooking chamber more uniform.

For example, the distance from the first sub-outlet to the center of the plurality of inlets is smaller than the distance from the second sub-outlet to the center of the plurality of inlets. This may make the temperature field within the cooking chamber more uniform.

Illustratively, when the spiral direction of the plurality of air inlets is clockwise, the plurality of second air outlets are offset towards the left side relative to the center of the plurality of air inlets, and when the spiral direction of the plurality of air inlets is counterclockwise, the plurality of second air outlets are offset towards the right side relative to the center of the plurality of air inlets. This may make the temperature field within the cooking chamber more uniform.

The third air outlet is located on the left side of the plurality of air inlets when the plurality of second air outlets are offset towards the left side relative to the centers of the plurality of air inlets, and the third air outlet is located on the right side of the plurality of air inlets when the plurality of second air outlets are offset towards the right side relative to the centers of the plurality of air inlets, and the ventilation area of the third air outlet is smaller than that of the first air outlet. Therefore, the problem of air accumulation caused by rotation of the fan can be solved, and the temperature field in the cooking cavity is more uniform.

Illustratively, the third air outlet includes a plurality of round holes. The round hole is more convenient to process, thereby reducing the cost of the protective cover.

Illustratively, the third outlet vent is lower than the center of the plurality of inlet vents. Because the heater sets up in the below usually, set up the bottom that the third air outlet is closer to the protection casing and can be convenient for with the high temperature rapid diffusion in culinary art chamber to can make being heated of food comparatively even better.

Illustratively, the plurality of air inlets include a plurality of first air inlets and a plurality of second air inlets, the plurality of first air inlets and the plurality of second air inlets are spaced apart from each other and are spirally arranged, each of the second air inlets is located between two adjacent first air inlets, and the plurality of second air inlets are closer to outer ends of the plurality of first air inlets than inner ends of the plurality of first air inlets. Therefore, the air inlets can be diffused more, and air at various positions can enter the space between the inner container and the protective cover conveniently.

Illustratively, the length of the second intake vent is greater than or equal to half the length of the first intake vent. Therefore, the total ventilation area of the plurality of air inlets can be increased as much as possible, and air at each position can enter between the inner container and the protective cover conveniently.

According to another aspect of the present invention, there is also provided a cooking apparatus. The cooking device comprises an inner container, a fan, a first heater and any one of the fan protective covers, the fan protective covers cover the fan, the air inlets and the air outlets face the inner container, and the first heater is arranged at the bottom of the inner container. The temperature field in the cooking cavity of the cooking device is more uniform, so that the food can be heated more uniformly.

The second heater is arranged at the top of the liner, and the rated power of the second heater is smaller than that of the first heater. Through setting up the second heater, can carry out the three-dimensional heating in the culinary art device, the food of being convenient for more is heated comparatively evenly.

Illustratively, the first heater is an electric ceramic furnace and the second heater is a heating tube. The electric ceramic stove has the advantages of wide heating range, uniform heating, small radiation, high heating temperature and the like. The heating pipe has a great deal of advantages such as the overall arrangement is convenient, small.

A series of concepts in a simplified form are introduced in the disclosure, which will be described in further detail in the detailed description section. The summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a perspective view of a protective cover for a blower according to an exemplary embodiment of the present invention; and

fig. 2 is a front view of the protection cover for a blower fan shown in fig. 1.

Wherein the figures include the following reference numerals:

100. an air inlet; 110. a first air inlet; 120. a second air inlet; 200. a protrusion; 210. a connecting portion; 300. an air outlet; 310. a first air outlet; 311. a first sub-outlet; 312. a second sub-outlet; 320. a second air outlet; 330. and a third air outlet.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art, however, will understand that the following description illustrates only a preferred embodiment of the invention and that the invention may be practiced without one or more of these details. In addition, some technical features that are well known in the art are not described in detail in order to avoid obscuring the present invention.

According to the utility model discloses an aspect provides a protection casing for fan. The protective cover for the fan can be applied to any suitable cooking device. Therefore, according to another aspect of the present invention, there is also provided a cooking apparatus. Cooking devices include, but are not limited to, ovens and steam ovens. The protective cover for a blower fan can also be applied to a refrigerator, a semiconductor cooling/heating product, and the like, if necessary.

The cooking device may include an inner container (not shown), a fan (not shown), a first heater (not shown) and any kind of protective cover (hereinafter referred to as protective cover) provided by the present invention. The inner container can surround to form a cooking cavity. The user may place food into the cooking cavity to cook the food. The fan may be of various types known in the art or that may occur in the future. The protection casing can cover on the fan, and the fan can set up between inner bag and protection casing to it is isolated with the fan to make culinary art chamber, avoids the user injured. The first heater may employ various types of heaters known in the art or that may occur in the future. Preferably, the first heater may be an electric ceramic oven. The electric ceramic stove has the advantages of wide heating range, uniform heating, small radiation, high heating temperature and the like. The first heater can be arranged at the bottom of the inner container. The inner container, the fan and the first heater are well known in the art, and the improvement of the present invention is not in the structure of the three, and thus will not be described in further detail.

As shown in fig. 1-2, the shield may have a plurality of air inlets 100 and a plurality of air outlets 300. The plurality of air inlets 100 and the plurality of air outlets 300 are each facing the inside of the inner container, i.e., the cooking chamber. That is to say, through the effect of fan, wind can get into between inner bag and the protection casing through a plurality of air intakes 100, returns the culinary art intracavity through a plurality of air outlets 300 to form hot-blast convection current, promote the samming performance in the culinary art intracavity, so that being heated of food is comparatively even.

Optionally, a connection portion 210 may be provided on the shield. In the illustrated embodiment, the attachment portion 210 may be a mounting hole through which a protective cover may be passed with fasteners to secure the protective cover to a liner or other suitable structure. In other embodiments not shown, the connection portion 210 may also be of any other suitable configuration.

A plurality of intake vents 100 may be provided in a central region of the shield. In the illustrated embodiment, the plurality of intake vents 100 may be generally circular. And a plurality of the air inlets 100 may be provided coaxially with the blower. Therefore, the resistance of air intake can be reduced, and the air intake efficiency is improved. In other embodiments not shown, the plurality of air intakes 100 may also be rectangular, trapezoidal, etc. in their entirety. The shape of each of the plurality of intake vents 100 may be the same or different. Optionally, when the plurality of air inlets 100 face the fan, the shield may be provided with a protrusion 200. The opening of the protrusion 200 faces the blower. The protrusion 200 may at least partially accommodate a blower.

A plurality of air outlets 300 may be provided at the edge region of the shield. In the embodiment shown in the drawings, a plurality of the outlet ports 300 may be dispersedly disposed at various positions of the edge region of the shield. In other embodiments not shown, multiple outlets 300 may be collectively disposed. The shape of each of the plurality of outlet vents 300 may be the same or different. The plurality of outlet vents 300 may include a plurality of first outlet vents 310 and a plurality of second outlet vents 320. The shape of each of the plurality of first outlet ports 310 may be the same or different. The shape of each of the plurality of second outlet ports 320 may be the same or different. The plurality of first outlet vents 310 may be located above the plurality of inlet vents 100. That is, the plurality of first outlets 310 are relatively far away from the first heater. The plurality of second outlet vents 320 may be located below the plurality of inlet vents 100. That is, the plurality of second outlets 320 are relatively close to the first heater.

The total ventilation area of the plurality of first air outlets 310 may be smaller than the total ventilation area of the plurality of second air outlets 320. The total ventilation area of the first air outlets 310 refers to the sum of the ventilation areas of the first air outlets 310, but not the ventilation area of one of the first air outlets 310. Similarly, the total ventilation area of the second air outlets 320 refers to the sum of the ventilation areas of the second air outlets 320, rather than the ventilation area of one of the second air outlets 320.

Through the function of the fan, the wind can enter between the liner and the shield through the plurality of wind inlets 100, and then return to the cooking cavity through the plurality of first wind outlets 310 and the plurality of second wind outlets 320. The wind entering the cooking cavity is spread, and when the wind blows on the inner container, the wind can be reflected to form multi-angle wind. This can reduce the hot air flow dead zone. Because a plurality of second air outlets 320 are closer to the first heater, and a plurality of first air outlets 310 are farther away from the first heater, the space temperature at which a plurality of second air outlets 320 are located is higher, and the total ventilation area of the plurality of second air outlets 320 is increased, so that the hot air fluidity is improved, the hot air convection effect can be improved, the temperature uniformity in the cooking cavity is improved, and the heating of food is more uniform.

It should be noted that, because the heaters of most cooking devices are arranged at the bottom of the inner container, the application range of the protective cover is large and the protective cover is practical.

Preferably, the cooking apparatus may further include a second heater (not shown). The second heater and the first heater may be the same or different. Preferably, the second heater may be a heating tube. The heating pipe has a great deal of advantages such as the overall arrangement is convenient, small. The second heater may be disposed at a top of the inner container. That is, the second heater is relatively close to the plurality of second outlet ports 320. The second heater may have a power rating less than the power rating of the first heater. Through setting up the second heater, can carry out the three-dimensional heating in the culinary art device, the food of being convenient for more is heated comparatively evenly.

Preferably, as shown in fig. 1-2, each of the plurality of first air outlets 310 and the plurality of second air outlets 320 is an elongated hole. The dimensions of each slot may be the same or different. The slot hole can also prevent effectively that debris from being blown into between protection casing and the inner bag by wind under the prerequisite of guaranteeing draught area, plays the effect of grid.

Further, as shown in fig. 1-2, the plurality of first air outlets 310 and the plurality of second air outlets 320 may each extend in a vertical direction. Thus, the processing is convenient, the centralized arrangement can be realized, and the space is saved.

Preferably, as shown in fig. 1-2, the plurality of air intakes 100 may be arranged in a spiral. The spiral direction of the plurality of air inlets 100 may be the same as the rotation direction of the fan. That is, when the rotation direction of the fan is clockwise, the plurality of air inlets 100 may be spirally arranged clockwise; when the rotation direction of the fan is counterclockwise, the plurality of air inlets 100 may be spirally arranged counterclockwise. Through the arrangement, the resistance of air inlet can be reduced, so that the air inlet efficiency is improved.

Further, as shown in fig. 1-2, the plurality of first air outlets 310 may include a first sub-air outlet 311 and a second sub-air outlet 312. The first sub-outlet 311 and the second sub-outlet 312 may be respectively located at two upper sides of the plurality of air inlets 100. The first sub-outlet 311 and the second sub-outlet 312 may be sequentially arranged along a spiral direction of the plurality of air inlets 100. That is, the first sub-outlet 311 is located in front of the second sub-outlet 312 along the spiral direction of the plurality of air inlets 100. In the illustrated embodiment, since the intake vent 100 spirals in the counterclockwise direction, the intake vent 100 spirals substantially to the left in the area above the intake vent 100, and thus the first sub-vent 311 is located at the right side of the second sub-vent 312. Based on this, the ventilation area of the second sub-air outlet 312 may be smaller than the ventilation area of the first sub-air outlet 311. The inventors have found that this makes the temperature field in the cooking chamber more uniform.

Further, as shown in fig. 1-2, the distance from the first sub-outlet 311 to the center of the plurality of air intakes 100 may be smaller than the distance from the second sub-outlet 312 to the center of the plurality of air intakes 100. The inventors have found that this makes the temperature field in the cooking chamber more uniform.

In an embodiment where each of the plurality of first air outlets 310 is a long hole, the number of the first sub air outlet 311 may be one, and the number of the second sub air outlet 312 may be three. The lengths of the first sub-air outlet 311 and the second sub-air outlet 312 may be 15-17 mm, and the widths of the first sub-air outlet 311 and the second sub-air outlet 312 may be 2-4 mm.

Alternatively, when the spiral direction of the plurality of intake ports 100 is clockwise, the plurality of second air outlets 320 may be offset toward the left side with respect to the center of the plurality of intake ports 100; when the spiral direction of the plurality of intake ports 100 is counterclockwise, the plurality of second air outlets 320 may be offset toward the right side with respect to the center of the plurality of intake ports 100. Taking the illustrated embodiment as an example, the air inlet 100 spirals in a counterclockwise direction, and the fan rotates in the counterclockwise direction, so that a vortex generated by the fan in the cooking cavity generates a slight air accumulation in the lower right corner of the cooking cavity (i.e. the air speed at this position is less than the air speed at the corresponding position on the left side), and by offsetting the plurality of second air outlets 320 toward the right side, more air can be blown into the cooking cavity from the right side to stir the cooking cavity, which is more beneficial to the temperature uniformity at this position.

In the embodiment where each of the plurality of second air outlets 320 is a long hole, the number of the second air outlets 320 may be 13-17. The length of the second air outlets 320 may be 17-19 mm, and the width of the second air outlets 320 may be 2-4 mm.

Further, as shown in fig. 1-2, a third air outlet 330 may be further disposed on the protective cover. The shape and number of the third outlet ports 330 may be arbitrary. Preferably, the third air outlet 300 may include a plurality of circular holes. Further, the number of the round holes can be 2-5, and the diameter of the round holes can be 3-5 mm. The round hole is more convenient to process, thereby reducing the cost of the protective cover.

The third outlet 330 may be located on the left or right side of the plurality of inlets 100 and aligned with the offset direction of the plurality of second outlets 320. That is, when the plurality of second outlet ports 320 are offset toward the left side with respect to the center of the plurality of intake ports 100, the third outlet port may be located at the left side of the plurality of intake ports 100. As shown, when the plurality of second outlet ports 320 are offset toward the right side with respect to the center of the plurality of intake ports 100, the third outlet port 330 may be located at the right side of the plurality of intake ports 100. The ventilation area of the third outlet 330 may be smaller than the ventilation area of the first outlet 310. The inventor has found that this solves the problem of air build-up caused by the rotation of the fan, making the temperature field within the cooking chamber more uniform.

Further, as shown in fig. 1-2, the third outlet 330 may be lower than the center of the plurality of inlets 100. Because the heater sets up in the below usually, set up third air outlet 330 and more be close to the bottom of protection casing can be convenient for with the high temperature rapid diffusion in culinary art chamber to can make being heated of food comparatively even better.

Preferably, as shown in fig. 1-2, the plurality of intake vents 100 may include a plurality of first intake vents 110 and a plurality of second intake vents 120. The plurality of first intake vents 110 and the plurality of second intake vents 120 may be spaced apart from each other and spirally disposed. Each of the second intake vents 120 may be located between two adjacent first intake vents 110. The plurality of second intake vents 120 are closer to the outer ends of the plurality of first intake vents 110 than to the inner ends of the plurality of first intake vents 110. This may allow the plurality of air inlets 100 to be more diffuse, allowing air from various locations to enter between the inner container and the shield.

Further, as shown in FIGS. 1-2, the length of the second intake vent 120 may be greater than or equal to half the length of the first intake vent 110. Therefore, the total ventilation area of the plurality of air inlets 100 can be increased as much as possible, and wind at various positions can enter between the liner and the protective cover.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front", "rear", "upper", "lower", "left", "right", "horizontal", "vertical", "horizontal" and "top", "bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

For ease of description, relative terms of regions such as "above … …", "above … …", "above … …", "above", and the like may be used herein to describe the regional positional relationship of one or more components or features with other components or features as illustrated in the figures. It is to be understood that the relative terms of the regions are intended to encompass not only the orientation of the element as depicted in the figures, but also different orientations in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (15)

1. The utility model provides a protection casing for fan, its characterized in that, the middle part region of protection casing for the fan is provided with a plurality of air intakes, the edge region of protection casing for the fan is provided with a plurality of air outlets, a plurality of air outlets are including being located a plurality of first air outlets of a plurality of air intakes tops and being located a plurality of second air outlets of a plurality of air intakes below, the total draught area of a plurality of first air outlets is less than the total draught area of a plurality of second air outlets.

2. The protective cover for a blower of claim 1 wherein each of the first plurality of air outlets and the second plurality of air outlets are elongated holes.

3. The draft shield according to claim 2, wherein the first plurality of air outlets and the second plurality of air outlets each extend in a vertical direction.

4. The protective cover according to claim 1, wherein the plurality of air inlets are arranged in a spiral shape, and the spiral direction of the plurality of air inlets is the same as the rotation direction of the fan.

5. The protective cover according to claim 4, wherein the plurality of first outlets include a first sub-outlet and a second sub-outlet respectively located at two sides above the plurality of air inlets, the first sub-outlet and the second sub-outlet are sequentially arranged along a spiral direction of the plurality of air inlets, and a ventilation area of the first sub-outlet is larger than a ventilation area of the second sub-outlet.

6. The protective hood for a blower of claim 5 wherein the distance from the first sub-outlet to the center of the plurality of air intakes is less than the distance from the second sub-outlet to the center of the plurality of air intakes.

7. The protective hood for a blower of claim 4 wherein the second plurality of air outlets are offset to the left with respect to the center of the air inlet when the spiral direction of the air inlet is clockwise and are offset to the right with respect to the center of the air inlet when the spiral direction of the air inlet is counterclockwise.

8. The protective cover for a blower according to claim 7, wherein a third outlet is further provided on the protective cover for a blower, the third outlet is located on the left side of the plurality of air inlets when the plurality of second outlets are offset toward the left side with respect to the center of the plurality of air inlets, the third outlet is located on the right side of the plurality of air inlets when the plurality of second outlets are offset toward the right side with respect to the center of the plurality of air inlets, and a ventilation area of the third outlet is smaller than a ventilation area of the first outlet.

9. The protective hood for a blower of claim 8 wherein said third air outlet includes a plurality of round holes.

10. The draft shield according to claim 8, wherein the third outlet is lower than a center of the plurality of inlets.

11. The protective cover for a blower fan according to claim 1, wherein the plurality of air inlets include a plurality of first air inlets and a plurality of second air inlets, the plurality of first air inlets and the plurality of second air inlets are spaced apart from each other and are spirally arranged, each of the second air inlets is located between two adjacent first air inlets, and the plurality of second air inlets are closer to outer ends of the plurality of first air inlets than to inner ends of the plurality of first air inlets.

12. The protective hood for a blower of claim 11 wherein the length of the second inlet vent is greater than or equal to half the length of the first inlet vent.

13. A cooking device, characterized by comprising an inner container, a fan, a first heater and the fan protective cover as claimed in any one of claims 1 to 12, wherein the fan protective cover covers the fan, the plurality of air inlets and the plurality of air outlets face the inner container, and the first heater is arranged at the bottom of the inner container.

14. The cooking device of claim 13, further comprising a second heater disposed on top of said inner container, said second heater having a power rating less than a power rating of said first heater.

15. The cooking device of claim 14, wherein the first heater is an electric ceramic oven and the second heater is a heating tube.

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