Cooking utensil and hot air cover thereof

Abstract

The embodiment of the utility model provides a cooking utensil, a hot air cover of the cooking utensil and a centrifugal fan used for the cooking utensil. The hot air cover comprises a main shell, an upper side shell and a lower side shell. According to the hot air cover, the upper side shell is provided with the upper air outlet, the lower side shell is provided with the lower air outlet, the overall air outlet area of the upper air outlet is larger than the overall air outlet area of the lower air outlet, when the centrifugal fan rotates, hot air mainly flows out through the upper air outlet and flows towards the opposite side, and then food on each layer is steamed, baked and heated from top to bottom during backflow; meanwhile, the hot air direction of the lower air outlet can be changed, so that hot air of the lower air outlet can be blown to the opposite side, flows back together with hot air heated on the lower layer steaming and baking tray and can make full contact with food, it is guaranteed that the temperatures of the lower layer food and the upper layer food are roughly the same, and therefore the uniformity of multi-layer food steaming and baking can be improved.

Description

Technical Field

[0001] This application relates to the technical field of kitchen utensils, and particularly to a cooking appliance and a hot air hood thereof. Background Art

[0002] With the acceleration of the pace of life, there is an increasing focus on efficient cooking. Multi-layer cooking at one time can reduce the cooking time of food when the cooking amount is large. During the cooking process, hot air generally enters the inner cavity of the steam oven through the air outlets on the peripheral side walls of the hot air hood, and then heats the food on the multi-layer steam baking trays. At the same time, since the air outlets on the peripheral side walls of the hot air hood distribute the hot air thrown out by the centrifugal fan, the hot air cannot effectively blow to the opposite side, and forced convection cannot be formed, resulting in reduced cooking efficiency and uneven heating.

[0003] Practical Content

[0004] This application provides a cooking appliance and a hot air hood thereof, in which the air output of the upper air outlet is greater than that of the lower air outlet, so that the hot air passing through the upper air outlet can blow to the opposite side and change the direction of the hot air passing through the lower air outlet, forming forced convection, thereby improving the uniformity of steaming and baking of food.

[0005] This embodiment provides a hot air hood for cooperating with the centrifugal fan of a cooking appliance. The hot air hood includes:

[0006] A main housing having an air return opening corresponding to the air return side of the centrifugal fan;

[0007] An upper side housing connected to the top end of the main housing and disposed at an angle with the main housing, and the upper side housing has an upper air outlet corresponding to the air outlet side of the centrifugal fan; and

[0008] A lower side housing connected to the bottom end of the main housing and disposed at an angle with the main housing, and the lower side housing has a lower air outlet corresponding to the air outlet side of the centrifugal fan;

[0009] Wherein, the overall air output area of the upper air outlet is larger than the overall air output area of the lower air outlet.

[0010] Further, the number of the upper air outlets is one or more; and / or,

[0011] The number of the lower air outlets is one or more.

[0012] Further, the upper side housing includes an upper air output area and an upper air blocking area, and the upper air output area and the upper air blocking area are arranged in sequence along the horizontal direction;

[0013] The lower side housing includes a lower air output area and a lower air blocking area, and the lower air blocking area and the lower air output area are arranged in sequence along the horizontal direction.

[0014] Further, the area of the upper air outlet area is greater than, equal to, or less than the upper wind shield area; and / or,

[0015] the area of the lower air outlet area is greater than, equal to, or less than the lower wind shield area.

[0016] Further, at least one of the following conditions is satisfied by the upper air outlet area, the upper wind shield area, the lower air outlet area, and the lower wind shield area:

[0017] The projection of the upper air outlet area and the lower wind shield area at least partially overlaps;

[0018] The projection of the upper wind shield area and the lower air outlet area at least partially overlaps;

[0019] The projection of the upper air outlet area and the lower air outlet area at least partially overlaps;

[0020] The projection of the upper wind shield area and the lower wind shield area at least partially overlaps.

[0021] Further, along the horizontal direction, the minimum distance between the upper air outlet area and the side of the main housing closer to the upper air outlet area is not less than 20 mm.

[0022] Further, along the horizontal direction, the lengths of the upper side housing and the lower side housing are e;

[0023] Along the horizontal direction, the maximum distance between the upper air outlet area and the side of the main housing closer to the upper air outlet area is b, and b ≤ 0.7e; and / or,

[0024] Along the horizontal direction, the maximum distance between the lower wind shield area and the side of the main housing closer to the lower wind shield area is c, and the maximum distance between the lower air outlet area and the side of the main housing closer to the lower wind shield area is d, where c ≥ 0.3e and d ≤ e - 20 mm.

[0025] Further, along the centrifugal direction of the hot air thrown out from the air outlet side, the upper air outlet has a first upper side wall relatively close to the air outlet side and a second upper side wall relatively far from the air outlet side;

[0026] The hot air hood further includes a flow guiding and reversing member, which is provided in one-to-one correspondence with a plurality of the upper air outlets and is connected to the upper side housing, and the flow guiding and reversing member is at least provided on the side where the second upper side wall is located to switch the movement direction of the hot air thrown out from the air outlet side from the original centrifugal direction to the flow guiding direction of the flow guiding and reversing member.

[0027] Further, the flow guiding and reversing member is provided on the side of the upper side housing facing the centrifugal fan; and / or,

[0028] The flow guide reversing member is arranged on a side of the upper shell facing away from the centrifugal fan.

[0029] Further, the flow guide reversing member is formed by press molding on a side of the upper shell away from the centrifugal fan, so that the upper shell is formed with the upper air outlet; or,

[0030] The flow guide reversing member and the upper shell are separate structures and are connected to each other.

[0031] Furthermore, the upper air outlet also has a third upper side wall connected to the first upper side wall and the second upper side wall, and the air flow guide and reversing member also extends to the third upper side wall.

[0032] Further, the flow guiding and reversing member extends from the second upper side wall to the third upper side wall, and along the extending direction, a protruding height of the flow guiding and reversing member relative to the upper shell gradually decreases.

[0033] Furthermore, the upper air outlet also has a third upper side wall connecting the first upper side wall and the second upper side wall, and the flow guide reversing member has a flow guide reversing surface, and a portion of the flow guide reversing surface serves as an outlet wall of the upper air outlet.

[0034] Furthermore, the flow guiding and reversing surface also extends to the third upper side wall of the upper air outlet, and the flow guiding and reversing surface is an arc-shaped surface.

[0035] Furthermore, the flow guiding and reversing member satisfies at least one of the following conditions:

[0036] The angle between the flow guide direction and the upper shell is not less than 85° and not more than 95°;

[0037] The maximum protrusion height of the flow guide reversing member relative to the upper shell is not less than 3 mm and not more than 8 mm.

[0038] Further, the angle between the upper shell and the main shell is not less than 135° and not less than 170°; and / or,

[0039] The included angle between the lower shell and the main shell is not less than 90° and not more than 140°.

[0040] Furthermore, the hot air hood also includes:

[0041] a left side shell connected to the main shell, the upper side shell and the lower side shell, and having a left air outlet; and / or,

[0042] The right shell is connected to the main shell, the upper shell and the lower shell and is arranged back to back with the left shell, and has a right air outlet.

[0043] The second aspect of the present application provides a cooking appliance, comprising:

[0044] The hot air hood as described in any one of the above;

[0045] A box body, the hot air hood is installed in the box body and divides the internal space of the box body into a hot air cavity and a cooking cavity, and the hot air cavity is communicated with the cooking cavity through the upper air outlet, the lower air outlet and the air return port;

[0046] A first heating element, the first heating element is arranged in the hot air cavity, and the first heating element is used for heating the air in the hot air cavity; and

[0047] A centrifugal fan, the centrifugal fan is arranged in the hot air cavity, and the air return side of the centrifugal fan is correspondingly arranged with the air return port to suck the air in the cooking cavity into the hot air cavity through the air return port, and the air outlet side of the centrifugal fan is correspondingly arranged with the upper air outlet and the lower air outlet to blow the air in the hot air cavity into the cooking cavity through the upper air outlet and the lower air outlet.

[0048] Further, a placement area for horizontally placing a steaming baking tray is provided in the cooking cavity, and a flow gap is formed between the placement area and the side of the box body opposite to the hot air hood, and the flow gap is not less than 10 mm.

[0049] Further, the hot air hood is arranged on the left side, the right side or the inner side of the cooking cavity.

[0050] Further, the projection of the rotation range of the centrifugal fan on the main housing covers the area where the air return port is located.

[0051] Further, the first heating element is of a tubular structure and is arranged around the centrifugal fan in a ring shape.

[0052] Further, the cooking appliance further comprises:

[0053] A second heating element, the second heating element is located on the upper side of the cooking cavity; and / or, the second heating element is located on the lower side of the cooking cavity.

[0054] The cooking appliance and its hot air hood provided in this embodiment have an upper air outlet formed in the upper shell and a lower air outlet formed in the lower shell. The overall air outlet area of the upper air outlet is larger than that of the lower air outlet. When the centrifugal fan rotates, the hot air mainly flows out through the upper air outlet and flows towards the opposite side. Then, when it flows back, it steam-roasts and heats the food on each layer from top to bottom. At the same time, it can change the hot air direction of the lower air outlet so that the hot air from the lower air outlet can also blow towards the opposite side and flow back together with the hot air heating the lower steam baking tray, enabling sufficient contact with the food and ensuring that the temperature of the lower food is roughly the same as that of the upper food, thereby improving the uniformity of steam roasting of multiple layers of food. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] To more clearly illustrate the technical solutions in this embodiment or the prior art, the following will briefly introduce the drawings required for the description of the embodiment or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0056] Figure 1 Structural schematic diagram of a cooking appliance from one perspective in an embodiment of the present application;

[0057] Figure 2 The present application Figure 1 Structural schematic diagram of another perspective of the structure shown;

[0058] Figure 3 Structural schematic diagram of the hot air hood in an embodiment of the present application;

[0059] Figure 4 The present application Figure 3 Enlarged schematic diagram of the structure at A in the present application;

[0060] Figure 5 The present application Figure 3 Structural schematic diagram of another perspective of the structure shown;

[0061] Figure 6 The present application Figure 3 Structural schematic diagram of another perspective of the structure shown;

[0062] Figure 7 For the application Figure 1 Structural schematic diagram of another perspective of the structure shown;

[0063] Figure 8 Hot air streamline distribution diagram in the related art;

[0064] Figure 9 Hot air streamline distribution diagram in an embodiment of the present application;

[0065] Figure 10 It is a schematic diagram of the change in the hot air flow direction in the related art and in an embodiment of the present application.

[0066] Explanation of the reference numerals: 100, hot air hood; 10, main housing; 10a, air return opening; 20, upper housing; 20a, upper air outlet; 20b, first upper side wall; 20c, second upper side wall; 20d, third upper side wall; 30, lower housing; 30a, lower air outlet; 40, flow guiding and reversing member; 40a, flow guiding and reversing surface; 50, left housing; 60, right housing; 200, box body; 200a, hot air cavity; 200b, cooking cavity; 200c, placement area; 300, first heating element; 400, centrifugal fan; 500, second heating element; 600, steaming baking tray. Detailed implementation manners

[0067] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0068] Please refer to Figure 1-2 , this embodiment provides a cooking appliance, which can be an oven or a steam oven, and is at least used for baking food. The following takes the cooking appliance as a steam oven as an example for illustration, that is, the cooking appliance can both steam food and bake food. The cooking appliance includes a hot air hood 100, a box body 200, a first heating element 300 and a centrifugal fan 400.

[0069] The box body 200, as the appearance component of the cooking appliance, is used to protect the internal components of the cooking appliance. An opening and a box door for opening and closing the opening are provided on the box body 200.

[0070] The hot air hood 100 is installed inside the box body 200 and divides the internal space of the box body 200 into a hot air cavity 200a and a cooking cavity 200b. The hot air cavity 200a houses the first heating element 300 and the centrifugal fan 400. By the cooperation of the first heating element 300 and the centrifugal fan 400, hot air (or hot air flow) can be generated, while the cooking cavity 200b is used for steaming and baking food. The opening of the box body 200 is also the opening of the cooking cavity 200b. Through this opening, it is convenient for the user to place food in the cooking cavity 200b or take out the food in the cooking cavity 200b through the steaming baking tray 600.

[0071] Please refer to Figure 3, the hot air hood 100 includes an upper shell 20 and a lower shell 30. The upper shell 20 is connected to the top end of the main shell 10 and is arranged at an angle with the main shell 10. The upper shell 20 has an upper air outlet 20a corresponding to the air outlet side of the centrifugal fan 400. The lower shell 30 is connected to the bottom end of the main shell 10 and is arranged at an angle with the main shell 10. The lower shell 30 has a lower air outlet 30a corresponding to the air outlet side of the centrifugal fan 400.

[0072] By providing the upper air outlet 20a and the lower air outlet 30a, the hot air cavity 200a and the cooking cavity 200b can be communicated. And by arranging the upper shell 20 at an angle with the main shell 10, the air thrown out by the centrifugal fan 400 can flow into the cooking cavity 200b through the upper air outlet 20a to bake the food. Specifically, the hot air flowing into the cooking cavity 200b through the upper air outlet 20a flows into the space between the upper steaming baking tray 600 and the top wall of the cooking cavity 200 to at least cook the food in the upper steaming baking tray 600. By arranging the lower shell 30 at an angle with the main shell 10, the air thrown out by the centrifugal fan 400 can flow into the cooking cavity 200b through the lower air outlet 30a to cook the food. Specifically, the hot air flowing into the cooking cavity 200b through the lower air outlet 30a flows into the space between the lower steaming baking tray 600 and the bottom wall of the cooking cavity 200.

[0073] Please continue to refer to Figure 2 , the centrifugal fan 400 is rotatably arranged in the hot air cavity 200a. When it rotates, the air generated by the rotation is thrown out along the edge of the impeller of the centrifugal fan 400 and enters the cooking cavity 200b through the upper air outlet 20a and the lower air outlet 30a. At the same time, the gas in the cooking cavity 200b will also flow back into the hot air cavity 200a from the air return port 10a, thereby realizing the circular flow of hot air between the hot air cavity 200a and the cooking cavity 200b.

[0074] Please continue to refer to Figure 2 , the first heating element 300 is located in the hot air cavity 200a. The air generated by the rotation of the centrifugal fan 400 is heated by the first heating element 300 and then flows into the cooking cavity 200b through the upper air outlet 20a. The first heating element 300 can be an electric heating structure such as a heating wire or a heating tube. Among them, the electric heating tube usually applies to the environment that requires high-temperature heating due to its complete structure and insulating layer. Therefore, in this embodiment, the electric heating tube is preferably adopted.

[0075] It can be understood that in the related art, air outlets are opened on the upper side, lower side, left side and right side of the hot air hood 100. When the power of the centrifugal fan 400 is constant, the hot air will flow into the cooking cavity 200b through the air outlets around the hot air hood 100. At this time, since the hot air is distributed, the flow rate of each air outlet is relatively low, and it is difficult for the hot air to blow to the opposite side of the hot air hood 100 (such asFigure 8 as shown

[0076] In this embodiment, the overall air outlet area of the upper air outlet 20a is larger than that of the lower air outlet 30a. That is, most of the hot air flows out through the upper air outlet 20a. At this time, the hot air flowing out through the upper air outlet 20a is large enough to blow to the opposite side of the hot air hood 100. A small part flows out through the lower air outlet 30a, and the hot air is relatively small. Therefore, when the hot air flowing out through the lower air outlet 30a moves to the middle of the bottom wall of the cooking cavity 100b, it will move upward due to its small mass and flow along the bottom wall of the lowermost steaming baking tray 600. Since the hot air through the upper air outlet 20a is large, during the process of blowing to the side wall and then flowing back, the large hot air from the upper air outlet 20a will drive the hot air from the lower air outlet 20a to change direction, so that the hot air flowing out through the lower air outlet 20a flows along the bottom wall of the cooking cavity 100b to the opposite side of the hot air hood 100 and flows back along the surface of the steaming baking tray 600 under the action of the return air of the centrifugal fan 400, so that the food on the steaming baking tray 600 can fully contact the hot air and ensure the uniformity of steaming and baking (as Figure 9 shown

[0077] Furthermore, the number of the upper air outlets 20a is one or more. When there are multiple upper air outlets 20a, since the centrifugal fan 400 blows air by swinging, in order to avoid excessive heat concentration, for example, when concentrating inside or outside the cooking cavity 200b, the multiple upper air outlets 20a are arranged horizontally. And it can be understood that when multiple upper air outlets 20a are arranged, they are also spaced apart along the inside and outside of the cooking cavity 200b.

[0078] The number of the lower air outlets 30a is one or more. When there are multiple lower air outlets 30a, in order to avoid heat concentration, so multiple lower air outlets 30a are also arranged in a row horizontally and are also spaced apart along the inside and outside of the cooking cavity 200b.

[0079] It can be understood that even when there is one upper air outlet 20a and multiple lower air outlets 30a, the air outlet area of the upper air outlet 20a is still larger than the combined air outlet area of the multiple lower air outlets 30a.

[0080] Please refer to Figure 5 , furthermore, the upper side shell 20 includes an upper air outlet area and an upper wind shielding area, which are arranged in sequence horizontally. The upper air outlet 20a is arranged in the upper air outlet area. The lower side shell 30 includes a lower air outlet area and a lower wind shielding area, which are arranged in sequence horizontally. The lower air outlet 30a is arranged in the lower air outlet area, wherein the upper air outlet area is larger than the lower air outlet area.

[0081] When the centrifugal fan 400 rotates, under the action of centrifugal force, the hot air of the centrifugal fan 400 is thrown out through the upper air outlet 20a and the lower air outlet 30a. This will cause the hot air thrown out through the upper air outlet 20a to concentrate towards the inner or outer side of the cooking cavity 200b. Correspondingly, the hot air thrown out through the upper air outlet 20a will concentrate towards the outer or inner side of the cooking cavity 200b. When the heat is concentrated on one side, it will flow directly from top to bottom, resulting in insufficient contact between the hot air and the food on the upper steaming and baking tray 600, thereby reducing the unevenness of steaming and baking.

[0082] Therefore, to avoid the above situation, the upper shell 20 includes an upper air outlet area and an upper wind shield area, and the lower shell 30 includes a lower air outlet area and a lower wind shield area. The upper air outlet area, the upper wind shield area, the lower air outlet area, and the lower wind shield area need to be set according to the rotation direction of the centrifugal impeller 400.

[0083] For example, please refer to Figure 3-5 , when the rotation direction of the centrifugal fan 400 in Figure 3 and Figure 5 is clockwise, then the rotation direction of the centrifugal fan 400 in Figure 2 is counterclockwise. From the Figure 3 perspective, the centrifugal direction of the air thrown out from the air outlet side of the centrifugal fan 400 is also approximately clockwise. At this time, the upper air outlet area is on the left side, the upper wind shield area is on the right side, and the distribution direction of the lower air outlet area and the lower wind shield area is that the lower wind shield area is on the left side and the lower air outlet area is on the right side. In this way, the distance from the upper air outlet 20a and the lower air outlet 30a to the inner and outer sides of the cooking cavity 200b is increased, which can avoid the heat being concentrated on one side. Further, it can avoid the situation that when the heat is concentrated on one side, it flows directly from top to bottom, resulting in insufficient contact between the hot air and the food on the upper steaming and baking tray 600, and then reducing the unevenness of steaming and baking. Therefore, in this embodiment, it can make the hot air flow more towards the middle of the cooking cavity 200b, so as to evenly steam and bake the food.

[0084] On the contrary, from the Figure 2 perspective, the centrifugal direction of the air thrown out from the air outlet side of the centrifugal fan 400 is approximately counterclockwise.

[0085] The area of the upper air outlet area is greater than, equal to, or less than the area of the upper wind shield area, and the area of the lower air outlet area is greater than, equal to, or less than the area of the lower wind shield area. It can be specifically set according to the actual situation, and the area of the upper air outlet area does not interfere with the area of the lower air outlet area, as long as it is ensured that the air outlet area of the upper air outlet 20a is larger than the area of the lower air outlet 30a.

[0086] It can be understood that when the area of the upper air outlet area is larger than that of the upper wind shield area, more hot air will blow into the cooking cavity 200b, and the steaming and baking efficiency is high. However, correspondingly, more hot air will also blow to the inner or outer side of the cooking cavity 200b, and when the heat is concentrated on one side, it will flow directly from top to bottom, making it difficult to ensure uniformity. When the area of the upper air outlet area is smaller than that of the upper wind shield area, it is equivalent to increasing the distance from the upper air outlet 20a to the inner or outer side of the cooking cavity 200b. Only a small part of the hot air is thrown into the cooking cavity 200b through the upper air outlet 20a of the upper air outlet area, and the steaming and baking efficiency is low. However, at the same time, less hot air will be thrown to the inner or outer side, which can ensure a certain degree of steaming and baking uniformity. Therefore, it is specifically set according to the actual situation and will not be restricted here. Similarly, the lower air outlet area and the lower wind shield area are the same.

[0087] Continue to refer to Figure 5 , the upper air outlet area, the upper wind shield area, the lower air outlet area, and the lower wind shield area satisfy at least one of the following conditions:

[0088] The projection of the upper air outlet area and the lower wind shield area at least partially overlap; the projection of the upper wind shield area and the lower air outlet area at least partially overlap; the projection of the upper air outlet area and the lower air outlet area at least partially overlap; the projection of the upper wind shield area and the lower wind shield area at least partially overlap.

[0089] Specifically set the positions of the upper air outlet area, the upper wind shield area, the lower air outlet area, and the lower wind shield area according to the actual situation for the user to choose, and will not be restricted here.

[0090] For example, when the projection of the upper air outlet area completely covers the lower wind shield area, the projection of the lower air outlet area can also completely cover the upper wind shield area. Through the settings of each air outlet area, the user can meet different steaming and baking requirements.

[0091] Furthermore, refer to Figure 5 , along the horizontal direction, the minimum distance a between the upper air outlet area and the side of the main housing 10 closer to the upper air outlet area is not less than 20 mm. Specifically, the value of a can be 20 mm, 25 mm, 30 mm, etc. If the value of a is too small, the upper air outlet area will be closer to the edge of the main housing 10, and the upper air outlet 20a is located in the upper air outlet area. The edge of the main housing 10 is a weak part of its structure. If an opening is made at the edge, the strength of this part will be further weakened, and it may be more likely to deform or break when subjected to external forces. Therefore, when the value of a is greater than 20 mm, the strength of this area can be ensured.

[0092] Taking Figure 5 as the perspective, the rotation direction of the centrifugal fan 400 in Figure 5 is clockwise. Therefore, the upper air outlet area is closer to the left side of the main housing 10, and the size of the left side of the upper air outlet area from the left edge of the main housing 10 is a, and the value of a is not less than 20 mm.

[0093] Please continue to refer to Figure 5 In the horizontal direction, the length of the upper shell 20 and the lower shell 30 is e. In the horizontal direction, the maximum distance between the upper air outlet area and the side of the main shell 10 closer to the upper air outlet area is b, and b ≤ 0.7e.

[0094] Please observe from the Figure 5 perspective. The rotation direction of the centrifugal fan 400 in Figure 5 is clockwise. The length of the upper shell 20 and the lower shell 30 is e, that is, the distance dimensions between the left and right sides of the upper shell 20 and the left and right sides of the lower shell 30 are e, and the distance dimension between the right side of the upper air outlet area and the left side of the upper shell 20 is b, where b ≤ 0.7e.

[0095] If the value of b is greater than 0.7e, that is to say, the upper air outlet area is much larger than the area of the upper wind shield area. That is, under the action of the centrifugal fan 400, the hot air will be thrown to the inside or outside of the cooking cavity 200b through the upper air outlet 20a. When the heat is concentrated on one side, it will flow directly from top to bottom, making it difficult to cover the food on the steaming baking tray, and thus the uniformity cannot be guaranteed.

[0096] Refer to Figure 5 In the horizontal direction, the maximum distance between the lower wind shield area and the side of the main shell 10 closer to the lower wind shield area is c, and the maximum distance between the lower air outlet area and the side of the main shell 10 closer to the lower wind shield area is d. Among them, c ≥ 0.3e and d ≤ e - 20.

[0097] Please continue to observe from the Figure 5 perspective. The rotation direction of the centrifugal fan 400 in Figure 5 is clockwise. The length of the upper shell 20 and the lower shell 30 is e. The distance between the right side of the lower wind shield area and the left side of the lower shell 30 is c. When the value of c is smaller, it means that the area of the lower wind shield area is smaller, and correspondingly, the area of the lower air outlet area is larger. Then, under the action of the centrifugal fan 400, part of the hot air passing through the lower air outlet 30a will be thrown to the inside or outside of the cooking cavity 200b. When the heat is concentrated on one side, it will flow directly from top to bottom, making it difficult to cover the food on the steaming baking tray, and thus the uniformity cannot be guaranteed. Therefore, in this embodiment, in order to ensure that the heat can be concentrated in the middle of the cooking cavity 200b, c ≥ 0.3e.

[0098] The distance between the right side of the lower air outlet area and the left side of the lower shell 30 is d, and d ≤ e - 20mm. If d is greater than e - 20mm, it means that the right side of the lower air outlet area is too close to the right side of the lower shell 30. There is a lower air outlet 30a provided on the lower air outlet area. Being too close to the right side of the lower shell 30 will weaken the strength of this part, and may cause it to be more likely to deform or break when subjected to an external force. Therefore, considering the strength of the entire hot air hood 100a, d ≤ e - 20mm.

[0099] Further, along the centrifugal direction of the hot air ejected from the air outlet side, the upper air outlet 20a has a first upper side wall 20b relatively close to the air outlet side and a second upper side wall 20c relatively far from the air outlet side.

[0100] Please refer to Figure 3-4 , it should be particularly noted that along the centrifugal direction of the hot air ejected from the centrifugal fan 400 on the air outlet side, the upper air outlet 20a has a first upper side wall 20b relatively close to the air outlet side and a second upper side wall 20c relatively far from the air outlet side.

[0101] Specifically, as Figure 3-4 shown, the rotation direction of the centrifugal fan 400 in Figure 3 is clockwise. From Figure 3 the perspective of observation, the centrifugal direction of the air ejected from the air outlet side of the centrifugal fan 400 is also approximately clockwise. At this time, for any upper air outlet 20a, along the centrifugal direction, its lower side wall is closer to the air outlet side of the centrifugal fan 400. Therefore, the lower side wall is the first upper side wall 20b, and its upper side wall is farther from the air outlet side of the centrifugal fan 400. Therefore, the upper side wall is the second upper side wall 20c.

[0102] Please combine with Figure 3-4 , the hot air hood further includes a flow guiding and direction changing member 40, which is provided in one-to-one correspondence with a plurality of upper air outlets 20a and is connected to the upper housing 20, that is, the flow guiding and direction changing member 40 is located in the path where the hot air flows from the hot air cavity 200a into the cooking cavity 200b. And the flow guiding and direction changing member 40 is at least provided on the side where the second upper side wall 20c is located, and can split the ejected hot air to switch the movement direction of the hot air ejected from the air outlet side from the original centrifugal direction to the flow guiding direction of the flow guiding and direction changing member 40. In this way, it can be avoided that the hot air generated in the hot air cavity 200a flows along the original centrifugal direction to one side of the cooking cavity 200b, causing the hot air to flow towards the top wall of the cooking cavity 200b, so that the hot air cannot effectively blow against the opposite side of the hot air hood 100, and thus cannot form a forced convection with the return air opening 10a on the hot air hood 100, resulting in insufficient contact between the hot air and the food on the upper steaming and baking tray 600, and further reducing the unevenness of steaming and baking. Or the flow rate of the hot air blowing towards the opposite side of the hot air hood 100 is significantly reduced, and the hot air flowing out of the lower air outlet 40 cannot be redirected, resulting in insufficient contact between the hot air and the food on the lower steaming and baking tray 600, and further reducing the unevenness of steaming and baking. Therefore, in this embodiment, by providing the flow guiding and direction changing member 40, the movement direction of the hot air ejected from the air outlet side can be switched from the original centrifugal direction to the flow guiding direction of the flow guiding and direction changing member 40, so that more hot air can be blown towards the opposite side of the hot air hood 100 and flow back from the opposite side, thereby steaming and baking the food evenly.

[0103] For example, please refer to Figure 1 , the hot air hood 100 is provided on the left side of the cooking cavity 200b, asFigure 8 As shown, when the air diversion and direction-changing member 40 is not provided at the upper air outlet 20a, the hot air flowing out from the upper air outlet 20a will flow to the inside or outside of the cooking cavity 200b, so that the hot air cannot come into contact with the food on the steaming baking tray 600 more fully, resulting in a reduction in cooking efficiency. For example Figure 8 As shown, after the air diversion and direction-changing member 40 is provided on the second upper side wall 20c of the upper air outlet 20a, the hot air thrown out can be shunted, so that the movement direction of the hot air thrown out from the air outlet side is switched from the original centrifugal direction to the air diversion direction of the air diversion and direction-changing member 40, which can make the hot air blow more towards the opposite side of the hot air hood 100 and flow back from the opposite side, thereby evenly steaming and baking the food.

[0104] Further, please refer to Figure 3 and Figure 5 , in an embodiment, the air diversion and direction-changing member 40 is provided on one side of the upper shell 20 facing the centrifugal fan 400, that is, located in the cooking cavity 200b. In this way, the air diversion and direction-changing member 40 can directly guide the hot air direction entering the cooking cavity 200b, guide the hot air flow direction in the cooking cavity 200b according to the user's needs, and achieve more accurate guidance.

[0105] In other embodiments, the air diversion and direction-changing member 40 is provided on one side of the upper shell 20 facing the centrifugal fan 400, that is, located in the hot air cavity 200a of the cooking appliance. Generally, users mostly clean the cooking cavity 200b. Therefore, when the air diversion and direction-changing member 40 is located in the hot air cavity 200a of the cooking appliance, the risk of cutting hands can be greatly reduced.

[0106] It can be understood that whether the air diversion and direction-changing member 40 is in the hot air cavity 200a or the cooking cavity 200b, it is located on the path of the hot air thrown out by the centrifugal fan 400.

[0107] Further, the air diversion and direction-changing member 40 is formed by pressing on the side of the upper shell 20 facing away from the centrifugal fan 400, and the upper shell 20 is formed with the upper air outlet 20a. By the pressing method, the whole can be easily formed, and the structure is relatively stable and not easy to deform.

[0108] In another embodiment, the air diversion and direction-changing member 40 and the upper shell 20 are of a split structure and are connected to each other. By the connection method of the split structure, such as welding and bolt connection, the requirement for the ductility of the material is relatively low, and it can be specifically selected according to the actual situation.

[0109] In the split structure, the air diversion and direction-changing member 40 can be arranged along the edge of the upper air outlet 20a or close to the upper air outlet 20a, and is specifically arranged according to the actual situation.

[0110] Please refer to Figure 3-4, in some embodiments, the upper air outlet 20a further has a third upper sidewall 20d connecting the first upper sidewall 20b and the second upper sidewall 20c, and the flow guiding and reversing member 40 also extends to the third upper sidewall 20d.

[0111] There are two third upper sidewalls 20d, which are respectively located on the first upper sidewall 20b and the second upper sidewall 20c. When the flow guiding and reversing member 40 also extends to the third upper sidewall 20d, that is to say, the extended part at this time is also in the path of the hot air thrown out by the centrifugal fan 400, playing a certain auxiliary flow guiding role, enabling a part of the hot air that originally blows directly to the inner or outer side of the cooking cavity 200b to change direction, so that this part of the hot air blows directly towards the middle of the cooking cavity 200b, improving the resource utilization ability.

[0112] On the basis that the flow guiding and reversing member 40 extends to the left sidewall and the right sidewall of the upper air outlet 20a, when the flow guiding and reversing member 40 of the present application adopts a flanging structure, that is, flanging along the orifice wall of the upper air outlet 20a of the upper housing 20, in order to consider the structural design of the flanging and avoid the flanging being too straight and resulting in the inability to form a flanging structure, that is, to avoid cracking on the left or right side of the flow guiding and reversing member 40 during flanging, therefore, it is designed that the flow guiding and reversing member 40 extends from both sides of the second upper sidewall 20c to the third upper sidewall 20d, and along the extending direction, the protruding height of the flow guiding and reversing member 40 relative to the upper housing 20 gradually decreases.

[0113] In one embodiment, please continue to refer to Figure 5 , the flow guiding and reversing member 40 has a flow guiding and reversing surface 40a, and a part of the flow guiding and reversing surface 40a serves as the orifice wall of the upper air outlet 20a, that is, the flow guiding and reversing member 40 adopted in this embodiment can be arranged along the edge of the upper air outlet 20a, so that the orifice wall of the upper air outlet 20a is smoothly connected and transitioned with the flow guiding and reversing member 40. This setting enables the air passing through the upper air outlet 20a to flow quickly along the flow guiding and reversing surface 40a, reducing the flow resistance of the hot air flowing through the upper air outlet 20a and the flow guiding and reversing member 40, and thus making it easier to change the hot air from the original centrifugal direction to the flow guiding direction of the flow guiding and reversing member 40.

[0114] Furthermore, the flow guiding and reversing surface 40a also extends to the third upper sidewall 20d of the upper air outlet 20a, that is, the left sidewall and the right sidewall of the upper air outlet 20a, and the flow guiding and reversing surface 40a is an arc surface. The arc surface can reduce the flow resistance of the hot air. At the same time, since the flow guiding and reversing surface 40a also extends to the upper sidewall and the lower sidewall of the upper air outlet 20a, it can play a certain role in gathering the air, enabling the hot air flowing out of the upper air outlet 20a to flow along the flow guiding and reversing surface 40a as much as possible, thereby achieving a better guiding effect.

[0115] See Figure 6, the included angle A between the upper shell 20 and the main shell 10 is not less than 135° and not more than 170°. Specifically, the included angle A can be 135°, 145°, 155°, 165°, and 170°. When the included angle A is within this range, as Figure 10 shown, through the diversion and commutation member 40 to commutate the hot air, compared with the related art, the hot air blows vertically against the top wall of the cooking cavity 200b ( Figure 10 the left figure in), the collision position is closer to the middle of the top wall of the cooking cavity 200b ( Figure 10 the right figure in). In this way, the flow resistance is reduced, and at the same time, the path of the hot air to the opposite side of the hot air hood 100 is shortened, so that the hot air can effectively blow to the opposite side and flow downward along the side wall of the opposite side, thereby evenly steaming and baking multi-layer foods.

[0116] When the included angle A is less than 135°, the included angle formed by the hot air flow direction and the top wall of the cooking cavity 200b will decrease, thereby increasing the flow path of the hot air to the hot air hood 100, so that the hot air cannot effectively blow to the opposite side. When the included angle A is greater than 170°, only a small part of the hot air on the air outlet side of the centrifugal fan 400 is thrown out through the upper air outlet 20a, and more hot air directly flows out through the upper air outlet 20a, so that the food near the upper air outlet 20a has a darker color under the action of the hot air with a high flow rate, and it is difficult to achieve uniform steaming and baking.

[0117] In order to prevent the hot air flowing out from the lower air outlet 30a into the cooking cavity 200b from being blocked by the steaming baking tray 600, the included angle C between the lower shell 30 and the main shell 10 is not less than 90° and not more than 140°. The specific value of the included angle C can be designed according to the actual height of the steaming baking tray 600, and can be 90°, 100°, 110°, 120°, 130°, and 140°.

[0118] In some embodiments, such as Figure 6As shown, the included angle B between the flow guiding direction of the flow guiding and reversing member 40 and the upper side shell 20 is not less than 85° and not more than 95°. Specifically, the included angle B can be 85°, 90°, and 95°. When the included angle B is between 85° and 95°, by limiting the included angle B, the heat flow guided by the flow guiding and reversing member 40 can be made to flow towards the top wall of the cooking cavity 200b as much as possible, then flow along the top wall of the cooking cavity 200b to one side of the hot air hood 100, and then under the action of the return air side of the centrifugal fan 400, the gas flows back from the opposite side, thereby achieving uniform heating of multiple layers of food. When the included angle B is less than 85°, the hot air will be closer to the upper steaming baking tray 600, especially the position on the upper steaming baking tray 600 closer to the upper air outlet 20a. This will cause a large amount of hot air and deep coloring at this place, making it difficult to achieve uniform steaming and baking. When the included angle B is greater than 95°, part of the hot air will still be directly thrown out towards the top wall of the cooking cavity 100b, making it difficult for this part of the hot air to flow along the top wall of the cooking cavity 100b to the opposite side of the hot air hood 100, and thus it is also difficult to achieve full coverage of the food, resulting in uneven steaming and baking.

[0119] Please continue to refer to Figure 6 , the maximum protrusion height f of the flow guiding and reversing member 40 relative to the upper side shell 20 is not less than 3 mm and not more than 8 mm. The value of a can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, and 8 mm. If the protrusion height a exceeds 8 mm, it is easy to touch the fingers, especially when doing cleaning. The higher the protrusion height, the greater the risk of cutting hands. If the protrusion height f is less than 3 mm, when the hot air passes through the flow guiding and reversing member 40, the path is small, so there is no obvious flow guiding effect. When the maximum protrusion height f of the flow guiding and reversing member 40 relative to the upper side shell 20 is not less than 3 mm and not more than 8 mm, not only is the flow guiding effect good, but also the risk of cutting hands can be minimized.

[0120] Please refer to Figure 3 and Figure 6 , it can be understood that in order to further ensure the uniformity of food steaming and baking, the hot air hood 100 further includes at least one of the left side shell 50 and the right side shell 60. The left side shell 50 is connected to the main shell 10, the upper side shell 20, and the lower side shell 40 and has a left air outlet (not shown in the figure). The right side shell 60 is connected to the main shell 10, the upper side shell 20, and the lower side shell 40 and is arranged opposite to the left side shell 50 and has a right air outlet (not shown in the figure).

[0121] The left air outlet and the right air outlet are closer to the return air outlet 10a compared to the upper air outlet 20a and the lower air outlet 30a. The left air outlet and the right air outlet can be one or multiple. For the middle or the lowermost steaming baking tray 600, each steaming baking tray 600 can be correspondingly provided with a left air outlet or a right air outlet.

[0122] In this embodiment, hot air flows out through the upper air outlet 20a and the lower air outlet 30a, and flows along the top and bottom ends of the cooking cavity 200b respectively towards the opposite side of the hot air hood 100, and then the hot air flows back from the opposite side. Therefore, when reaching the air return opening 10a, the heat and temperature have already decreased. Therefore, by opening the left air outlet and the right air outlet, the hot air flowing out from the left air outlet and the right air outlet is mixed with the hot air whose heat has decreased at the air return opening 10a, and the food near the air return opening 10a can be colored, which can further improve the uniformity.

[0123] Furthermore, the opening areas of the left air outlet and the right air outlet are smaller than the areas of the multiple upper air outlets 20a and the multiple lower air outlets 30a. In this way, the flow velocity of the hot air exported from the upper air outlet 20a and the lower air outlet 30a during the return flow is greater than the flow velocity of the left air outlet and the right air outlet. At this time, it is easy to form an "entrainment effect" between the left air outlet and the right air outlet and the air return opening 10a, so that the hot air flowing out from the left air outlet and the right air outlet is mixed with the hot air whose heat has decreased at the air return opening 10a, increasing the hot air heat at the air return opening 10a, and coloring the food near the air return opening 10a, avoiding the uneven baking of the food near the air return opening 10a and the food at other positions due to the obvious decrease in the temperature and heat of the hot air returning to the air return opening 10a when the left air outlet and the right air outlet are not opened.

[0124] Further, when the front-back distance of the steam oven is small, at this time, since the left air outlet and the right air outlet are respectively located on the front and back sides of the air return opening 10a, therefore, at this time, the distances between the left air outlet and the right air outlet and the air return opening 10a will be very close. At this time, the "entrainment effect" will be particularly obvious, that is, the hot air thrown out from the left air outlet and the right air outlet may be directly brought back to the hot air cavity 200a by the return air at the air return opening 10a. Therefore, the left air outlet and the right air outlet cannot play the above roles and will exacerbate the uneven baking between the steam baking trays 600 at different layers. At this time, the left air outlet and the right air outlet can be not opened.

[0125] In this application, in order to ensure the beauty of the hot air hood 100 and the uniformity of food steaming and baking, it is preferred that the hot air hood 100 includes a left shell 50 and a right shell 60, and the left air outlet on the left shell 50 is mirror-symmetrical with the right air outlet on the right shell 60.

[0126] Further, please refer to Figure 7 , there is a placement area 200c for horizontally placing the steam baking tray 600 in the cooking cavity 200b, and a flow gap is formed between the placement area 200c and the side of the box body 200 opposite to the hot air hood 100, and the flow gap g is not less than 10 mm.

[0127] It can be understood that when the overall air outlet area of the upper air outlet 20a is larger than that of the lower air outlet 30a, the hot air passing through the upper air outlet 20a will flow downward along the opposite side of the hot air hood 100, and the hot air passing through the lower air outlet 30a will flow along the bottom of the lowermost steaming baking tray 600 to the opposite side of the hot air hood 100. If g is less than 10 mm, only a small part of the hot air from the upper air outlet 20a can enter the space between the bottom of the lowermost steaming baking tray 600 and the bottom of the cooking cavity 200b through this gap, making it difficult to achieve the flow direction of the hot air from the lower air outlet 30a, and thus difficult to achieve uniform steaming and baking. Therefore, in this embodiment, in order to enable the hot air passing through the lower air outlet 30a to cover the food on the lowermost steaming baking tray 600 and achieve uniform steaming and baking, the flow gap g ≥ 10 mm.

[0128] It should be understood that when the hot air passing through the upper air outlet 20a flows back to the opposite side of the hot air hood 100, the steaming and baking temperature of the food on the uppermost steaming baking tray 600 is the highest, while the temperature of the food on the lower steaming baking trays 600 is relatively lower. Since the overall area of the upper air outlet 20a is larger than that of the lower air outlet 30a, and the flow gap g ≥ 10 mm, the hot air flowing out through the lower air outlet 30a can heat the food on the lower steaming baking trays 600 simultaneously with some of the hot air flowing out through the upper air outlet 20a, thus ensuring the uniform steaming and baking of multi-layer food.

[0129] In some embodiments, please refer to Figure 1 , the hot air hood 100 is disposed on the left side of the cooking cavity 200b. In other embodiments, the hot air hood 100 is disposed on the right side or inside of the cooking cavity 200b. When the hot air hood 100 is disposed on the left side, right side or inside of the cooking cavity 200b, compared with disposing the hot air hood 100 on the top side or bottom layer of the cooking cavity 200b, the return air of the centrifugal fan 400 can flow between adjacent steaming baking trays 600 and achieve multi-layer baking. The return air will not be blocked by the steaming baking trays 600, thus ensuring the uniform steaming and baking of multi-layer food.

[0130] Please refer to Figure 2-3 , the projection of the rotation range of the centrifugal fan 400 on the main housing 10 covers the area where the air return opening 10a is located. In this way, the air on the air outlet side of the centrifugal fan 400 will not flow out through the air return opening 10a, avoiding the "entrainment effect" and thus avoiding uneven steaming and baking of the food.

[0131] Please refer to Figure 1, in some embodiments, the cooking appliance further includes a second heating element 500. The structure of the second heating element 500 can refer to that of the first heating element 300 and can be an electric heating structure such as a heating wire or a heating tube. Since the electric heating tube has a complete structure and an insulating layer and is usually suitable for environments that require high-temperature heating, in this embodiment, the second heating element 500 is also preferably an electric heating tube.

[0132] The second heating element 500 is at least located on one side of the upper side (or top side) and the lower side (or bottom side) of the cooking cavity 200b.

[0133] That is, the second heating element 500 can be located on the upper side of the cooking cavity 200b, or on the lower side of the cooking cavity 200b, or simultaneously on the upper side and the lower side of the cooking cavity 200b, which can be specifically designed according to the actual steamed or roasted food and the heating power. In addition, the second heating element 500 can also assist in reheating the hot air flowing through the upper side or the lower side, and the hot air directly blows on the second heating element 500, improving the heat exchange efficiency between the second heating element 500 and the air, reducing the surface temperature of the second heating element 500, reducing the radiation effect of the second heating element 500 on the upper-layer ingredients or the lower-layer ingredients, and reducing the heat exchange difference between the upper and lower layers and the middle-layer ingredients. Thus, while improving the baking efficiency of the food, the baking uniformity of the food on different layers is also improved.

[0134] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship in the drawings, and are only for the convenience of describing the present application 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. Therefore, the terms describing the position relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0135] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hot air hood, characterized in that: Used to cooperate with a centrifugal fan (400) of a cooking appliance, the hot air hood comprises: A main casing (10) having a return air port (10a) corresponding to the return air side of the centrifugal fan (400); an upper shell (20) connected to the top end of the main shell (10) and arranged at an angle with the main shell (10), and the upper shell (20) has an upper air outlet (20a) corresponding to the air outlet side of the centrifugal fan (400); and A lower shell (30) connected to the bottom end of the main shell (10) and arranged at an angle with the main shell (10), and the lower shell (30) has a lower air outlet (30a) corresponding to the air outlet side of the centrifugal fan (400); Wherein, the overall air outlet area of ​​the upper air outlet (20a) is greater than the overall air outlet area of ​​the lower air outlet (30a).

2. The hot air hood according to claim 1, characterized in that: The number of the upper air outlets (20a) is one or more; and / or, The number of the lower air outlets (30a) is one or more.

3. The hot air hood according to claim 1, characterized in that: The upper shell (20) comprises an upper air outlet area and an upper wind shielding area, the upper air outlet area and the upper wind shielding area are arranged in sequence along the horizontal direction, and the upper air outlet (20a) is arranged in the upper air outlet area; The lower shell (30) comprises a lower air outlet area and a lower wind shielding area, the lower wind shielding area and the lower air outlet area are arranged in sequence along the horizontal direction, and the lower air outlet (30a) is arranged in the lower air outlet area; Wherein, the upper air outlet area is larger than the lower air outlet area.

4. The hot air hood according to claim 3, characterized in that: The area of ​​the upper wind outlet area is greater than, equal to or smaller than the upper wind shield area; and / or, The area of ​​the lower wind outlet area is greater than, equal to, or smaller than the lower wind shielding area.

5. The hot air hood according to claim 3, characterized in that: The upper air outlet area, the upper wind shielding area, the lower air outlet area, and the lower wind shielding area meet at least one of the following conditions: The projections of the upper air outlet area and the lower wind shielding area at least partially overlap; The projections of the upper wind shielding area and the lower wind outlet area at least partially overlap; The projections of the upper air outlet area and the lower air outlet area at least partially overlap; The projections of the upper wind shield area and the lower wind shield area at least partially overlap.

6. The hot air hood according to claim 3, characterized in that: Along the horizontal direction, the minimum distance between the upper air outlet area and the side of the main shell (10) closer to the upper air outlet area is not less than 20 mm.

7. The hot air hood according to claim 3, characterized in that: Along the horizontal direction, the length of the upper shell (20) and the lower shell (30) is e; Along the horizontal direction, the maximum distance between the upper air outlet area and the side of the main shell (10) closer to the upper air outlet area is b, b≤0.7e; and / or, Along the horizontal direction, the maximum distance between the lower wind shield area and the side of the main shell (10) closer to the lower wind shield area is c, and the maximum distance between the lower air outlet area and the side of the main shell (10) closer to the lower wind shield area is d, wherein c≥0.3e, d≤e-20mm.

8. The hot air hood according to claim 1, characterized in that: Along the centrifugal direction of the hot air thrown out from the air outlet side, the upper air outlet (20a) has a first upper side wall (20b) relatively close to the air outlet side and a second upper side wall (20c) relatively far from the air outlet side; The hot air hood also includes a flow guiding reversing member (40), which is arranged in one-to-one correspondence with the plurality of upper air outlets (20a) and is connected to the upper shell (20), and the flow guiding reversing member (40) is at least arranged on the side where the second upper side wall (20c) is located, so as to switch the movement direction of the hot air thrown out from the air outlet side from the original centrifugal direction to the flow guiding direction of the flow guiding reversing member (40).

9. The hot air hood according to claim 8, characterized in that: The flow guide reversing member (40) is arranged on a side of the upper shell (20) facing the centrifugal fan (400); and / or, The flow guide reversing member (40) is arranged on a side of the upper shell (20) facing away from the centrifugal fan (400).

10. The hot air hood according to claim 8, characterized in that: The flow guide reversing member (40) is formed by press molding on a side of the upper shell (20) facing away from the centrifugal fan (400), so that the upper shell (20) is formed with the upper air outlet (20a); or, The flow guide reversing component (40) and the upper shell (20) are separate structures and are connected to each other.

11. The hot air hood according to claim 8, characterized in that: The upper air outlet (20a) also has a third upper side wall (20d) connected to the first upper side wall (20b) and the second upper side wall (20c), and the air flow guide reversing member (40) also extends to the third upper side wall (20d).

12. The hot air hood according to claim 11, characterized in that: The flow guiding and reversing member (40) extends from the second upper side wall (20c) to the third upper side wall (20d), and along the extending direction, the protruding height of the flow guiding and reversing member (40) relative to the upper shell (20) gradually decreases.

13. The hot air hood according to claim 8, characterized in that: The flow guiding and reversing member (40) has a flow guiding and reversing surface (40a), and a portion of the flow guiding and reversing surface (40a) serves as an outlet wall of the upper air outlet (20a).

14. The hot air hood according to claim 13, characterized in that: The upper air outlet (20a) also has a third upper side wall (20d) connected to the first upper side wall (20b) and the second upper side wall (20c), the flow guiding and reversing surface (40a) also extends to the third upper side wall (20d) of the upper air outlet (20a), and the flow guiding and reversing surface (40a) is an arc-shaped surface.

15. The hot air hood according to claim 8, characterized in that: The flow guiding and reversing member (40) satisfies at least one of the following conditions: The angle between the flow guide direction and the upper shell (20) is not less than 85° and not more than 95°; The maximum protrusion height of the flow guide reversing member (40) relative to the upper shell (20) is not less than 3 mm and not more than 8 mm.

16. The hot air hood according to claim 1, characterized in that: The angle between the upper shell (20) and the main shell (10) is not less than 135° and not less than 170°; and / or, The included angle between the lower shell (30) and the main shell (10) is not less than 90° and not more than 140°.

17. The hot air hood according to claim 1, characterized in that: Also includes: a left side shell (50), connected to the main shell (10), the upper side shell (20) and the lower side shell (30), and having a left air outlet; and / or, The right side shell (60) is connected to the main shell (10), the upper side shell (20) and the lower side shell (30), is arranged opposite to the left side shell (50), and has a right air outlet.

18. A cooking utensil, characterized in that: include: The hot air hood (100) according to any one of claims 1 to 17; A box body (200), wherein the hot air cover (100) is installed in the box body (200), and the internal space of the box body (200) is divided into a hot air chamber (200a) and a cooking chamber (200b), and the hot air chamber (200a) is connected to the cooking chamber (200b) through the upper air outlet (20a), the lower air outlet (30a) and the return air outlet (10a); a first heating element (300), the first heating element (300) being arranged in the hot air cavity (200a), the first heating element (300) being used to heat the air in the hot air cavity (200a); and A centrifugal fan (400), the centrifugal fan (400) being arranged in the hot air chamber (200a), and the return air side of the centrifugal fan (400) being arranged corresponding to the return air port (10a), so as to suck the air in the cooking chamber (200b) into the hot air chamber (200a) through the return air port (10a), and the outlet air side of the centrifugal fan (400) being corresponding to the upper air port (20a) and the lower air port (30a), so as to blow the air in the hot air chamber (200a) into the cooking chamber (200b) through the upper air port (20a) and the lower air port (30a).

19. The cooking appliance according to claim 18, characterized in that The cooking cavity (200b) has a placement area for horizontally placing the steaming and baking tray (600), and a flow gap is formed between the placement area and a side of the box body (200) opposite to the hot air hood (100), and the flow gap is not less than 10 mm.

20. The cooking appliance according to claim 18, characterized in that The hot air hood is arranged on the left side, the right side or the inner side of the cooking cavity (200b).

21. The cooking appliance according to claim 18, characterized in that The projection of the rotation range of the centrifugal fan (400) on the main housing (10) covers the area where the return air port (10a) is located.

22. The cooking appliance according to claim 18, characterized in that The first heating element (300) is a tubular structure and is arranged around the centrifugal fan (400).

23. The cooking device according to any one of claims 18 to 22, characterized in that: Also includes: a second heating element (500), the second heating element (500) being located on the upper side of the cooking cavity (200b); And / or, the second heating element (500) is located at the lower side of the cooking cavity (200b).

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