Cooking utensil and hot air cover thereof

Abstract

The hot air cover is used for being matched with a centrifugal fan of the cooking utensil, the hot air cover comprises a main shell, an upper side shell and an upper side flow guiding and reversing part, the main shell and the upper side shell are arranged in an included angle mode, a plurality of upper air outlets are formed in the upper side shell, and the upper side flow guiding and reversing part is arranged at the positions corresponding to the upper air outlets; the movement direction of hot air thrown out by the centrifugal fan is switched from the original centrifugal direction to the flow guide direction of the upper side flow guide reversing piece through the upper side flow guide reversing piece, the hot air thrown out by the centrifugal fan can be prevented from being concentrated towards one side of the cooking cavity, and therefore the hot air can be made to face the opposite side wall, and then food is evenly heated.

Description

Technical Field

[0001] The present application relates to the technical field of kitchenware, and in particular to a cooking utensil and a hot air hood thereof. Background Art

[0002] As the pace of life accelerates, more and more attention is paid to efficient cooking. Cooking multiple layers at a time can reduce the cooking time of large quantities of food. During the cooking process of cooking appliances such as steam ovens, the flow of hot air is mainly driven by centrifugal fans. Due to the use of centrifugal fans, under the centrifugal effect, hot air flows downward more from the gap between the steaming and baking tray and the inner wall of the inner pot. The hot air cannot fully contact the food on the steaming and baking tray, resulting in reduced cooking efficiency and uneven heating. Utility Model Content

[0003] The present application provides a cooking utensil and a hot air hood thereof, which can change the moving direction of hot air through an upper air guide reversing member, so that the hot air can evenly heat food.

[0004] This embodiment provides a hot air hood for cooperating with a centrifugal fan of a cooking utensil, the hot air hood comprising:

[0005] A main housing having a return air port corresponding to the return air side of the centrifugal fan;

[0006] an upper shell connected to the top of the main shell and arranged at an angle with the main shell, and the upper shell has a plurality of upper air outlets corresponding to the air outlet side of the centrifugal fan, and 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; and

[0007] The upper side flow guide reversing member is arranged one by one corresponding to the multiple upper air outlets and connected to the upper side shell, and the upper side flow guide reversing member is arranged at least 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 guide direction of the upper side flow guide reversing member.

[0008] Further, the upper flow guide reversing member is arranged on a side of the upper shell facing the centrifugal fan; and / or,

[0009] The upper flow guide reversing member is arranged on a side of the upper shell facing away from the centrifugal fan.

[0010] Further, the upper flow guide reversing member is formed by press forming on a side of the upper shell away from the centrifugal fan, so that the upper shell forms the upper air outlet; or,

[0011] The upper flow guide reversing member and the upper shell are separate structures and are connected to each other.

[0012] Furthermore, the upper air flow guiding and reversing member also extends to the upper side wall and / or the lower side wall of the upper air outlet.

[0013] Further, the upper flow guide reversing member extends from the second upper side wall to the upper side wall, and along the extending direction, the protrusion height of the upper flow guide reversing member relative to the upper side shell gradually decreases; and / or,

[0014] The upper flow guide and reversing member will extend from the second upper side wall to the lower side wall, and along the extending direction, the protruding height of the upper flow guide and reversing member relative to the upper shell will gradually decrease.

[0015] Furthermore, the upper flow guiding and reversing member has an upper flow guiding and reversing surface, and a portion of the upper flow guiding and reversing surface serves as an outlet wall of the upper air outlet.

[0016] Furthermore, the upper flow guiding and reversing surface also extends to the upper side wall and the lower side wall of the upper air outlet, and the upper flow guiding and reversing surface is an arc-shaped surface.

[0017] Furthermore, the upper flow guide reversing member satisfies at least one of the following conditions:

[0018] The angle between the flow guide direction and the upper shell is not less than 85° and not more than 95°;

[0019] The maximum protrusion height of the upper flow guide reversing member relative to the upper shell is not less than 3 mm and not more than 8 mm.

[0020] Furthermore, the plurality of upper air outlets are arranged in a row along the horizontal direction, and along the horizontal direction, the upper air outlets all have an upper opening size a;

[0021] The upper flow guide reversing member has a maximum protrusion height b relative to the upper shell;

[0022] Among them, a≤b≤2a.

[0023] Furthermore, the angle between the upper shell and the main shell is not less than 135° and not less than 170°.

[0024] Furthermore, the hot air hood also includes:

[0025] a lower shell connected to the bottom end of the main shell and arranged at an angle with the main shell, and the lower shell has a plurality of lower air outlets corresponding to the air outlet side of the centrifugal fan, and along the centrifugal direction of the hot air thrown out from the air outlet side, the lower air outlet has a first lower side wall relatively close to the air outlet side and a second lower side wall relatively far from the air outlet side; and

[0026] The lower side flow guide reversing member is arranged one by one corresponding to the multiple lower air outlets and connected to the lower side shell, and the lower side flow guide reversing member is arranged at least on the side where the second lower 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 guide direction of the lower side flow guide reversing member.

[0027] Furthermore, the angle between the lower shell and the main shell is not less than 90° and not more than 140°.

[0028] Furthermore, the hot air hood also includes:

[0029] 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,

[0030] 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.

[0031] A second aspect of the present application provides a cooking utensil, comprising:

[0032] A hot air hood as described in any one of the above items;

[0033] A box body, wherein the hot air hood is installed in the box body and divides the internal space of the box body into a hot air chamber and a cooking chamber, wherein the hot air chamber is connected to the cooking chamber through the upper air outlet and the return air outlet;

[0034] A first heating element, the first heating element is disposed in the hot air cavity, and the first heating element is used to heat the air in the hot air cavity; and

[0035] A centrifugal fan is arranged in the hot air cavity, and a return air side of the centrifugal fan is arranged corresponding to the return air port so as to suck the air in the cooking cavity into the hot air cavity through the return air port, and an outlet air side of the centrifugal fan corresponds to the upper air outlet so as to blow the air in the hot air cavity into the cooking cavity through the upper air outlet.

[0036] Furthermore, the hot air hood is arranged on the left side, right side or inner side of the cooking cavity.

[0037] Furthermore, a projection of the rotation range of the centrifugal fan on the main housing covers the area where the return air outlet is located.

[0038] Furthermore, the first heating element is a tubular structure and is arranged around the centrifugal fan.

[0039] Furthermore, the cooking appliance further comprises:

[0040] A second heating element, wherein the second heating element is located at an upper side of the cooking cavity; and / or the second heating element is located at a lower side of the cooking cavity.

[0041] The cooking utensil and its hot air hood provided in the present embodiment are used in conjunction with the centrifugal fan of the cooking utensil. The hot air hood includes a main shell and an upper shell, and the two are arranged at an angle. A plurality of upper air outlets are provided on the upper shell, and an upper flow guide reversing member is provided at positions corresponding to the upper air outlets. The movement direction of the hot air thrown out by the centrifugal fan is switched from the original centrifugal direction to the flow guide direction of the upper flow guide reversing member through the upper flow guide reversing member, which can prevent the hot air thrown out by the centrifugal fan from concentrating on one side of the cooking cavity, thereby enabling the hot air to flow to the opposite side of the hot air hood, thereby evenly heating the food. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 This is a structural schematic diagram of a cooking utensil from one perspective in one embodiment of the present application;

[0044] Figure 2 This application Figure 1 A schematic structural diagram of another perspective of the structure shown;

[0045] Figure 3 This is a schematic diagram of the structure of a hot air hood in one embodiment of the present application;

[0046] Figure 4 For this application Figure 3 A schematic structural diagram of another perspective of the structure shown;

[0047] Figure 5 For this application Figure 3 A magnified schematic diagram of the structure at center A;

[0048] Figure 6 For this application Figure 3 A schematic diagram of the structure from another perspective of the structure shown (the direction of the arrow is the hot air flow path);

[0049] Figure 7 It is a hot air flow line distribution diagram in the related technology;

[0050] Figure 8 This is a hot air flow line distribution diagram in one embodiment of the present application;

[0051] Fig. 9 For this application Figure 3 A schematic structural diagram of another perspective of the structure shown;

[0052] Fig.10 It is a schematic diagram of the change of hot air flow direction in the related art and in one embodiment of the present application;

[0053] Fig.11 For this application Figure 3 A schematic structural diagram of another perspective of the structure shown.

[0054] Explanation of the reference numerals: 100, hot air hood; 10, main shell; 10a, return air outlet; 20, upper shell; 20a, upper air outlet; 20b, first upper side wall; 20c, second upper side wall; 30, upper flow guide and reversing member; 30a, flow guide and reversing surface; 40, lower shell; 40a, lower air outlet; 40b, first lower side wall; 40c, second lower side wall; 50, lower flow guide and reversing member; 60, left shell; 70, right shell; 200, box body; 200a, hot air chamber; 200b, cooking chamber; 300, first heating element; 400, centrifugal fan; 500, second heating element; 600, steaming and baking tray. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with 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.

[0056] See also Figure 1-2 The present embodiment provides a cooking appliance, which may be an oven or a steam oven, and is at least used for baking food. The following description takes the cooking appliance as an example of a steam oven, that is, the cooking appliance can both steam 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.

[0057] The box body 200 is an appearance component of the cooking appliance and is used to protect the internal components of the cooking appliance. The box body 200 is provided with an opening and a door for opening and closing the opening.

[0058] The hot air hood 100 is installed in the box body 200, and divides the internal space of the box body 200 into a hot air chamber 200a and a cooking chamber 200b. The hot air chamber 200a accommodates the first heating element 300 and the centrifugal fan 400. The cooperation of the first heating element 300 and the centrifugal fan 400 can generate hot air (or hot air flow), and the cooking chamber 200b is used to steam and bake food. The opening of the box body 200 is also the opening of the cooking chamber 200b. Through this opening, it is convenient for the user to place food in the cooking chamber 200b or take out food from the cooking chamber 200b through the steaming and baking tray 600.

[0059] See also Figure 3-4 The hot air cover 100 includes a main shell 10 and an upper shell 20. The main shell 10 has a return air port 10a corresponding to the return air side of the centrifugal fan 400. The upper shell 20 is connected to the top of the main shell 10 and is arranged at an angle with the main shell 10. The upper shell 20 has a plurality of upper air outlets 20a corresponding to the air outlet side of the centrifugal fan 400. The plurality of upper air outlets 20a can make the hot air chamber 200a and the cooking chamber 200b communicate with each other, and by setting the upper shell 20 and the main shell 10 at an angle, the air thrown out by the centrifugal fan 400 can flow into the cooking chamber 200b through the upper air outlet 20a to bake the food. Specifically, the hot air flowing into the cooking chamber 200b through the upper air outlet 20a flows into the space between the upper steaming and baking tray 600 and the top wall of the cooking chamber 200, so as to at least be used to cook the food in the upper steaming and baking tray 600.

[0060] Please continue reading Figure 2 The centrifugal fan 400 is rotatably arranged in the hot air chamber 200a. When it rotates, the wind generated by the rotation is thrown out along the edge of the impeller of the centrifugal fan 400 and enters the cooking chamber 200b through the upper air outlet 20a. At the same time, the gas in the cooking chamber 200b will also flow back into the hot air chamber 200a from the return air outlet 10a, thereby realizing the circulation of hot air between the hot air chamber 200a and the cooking chamber 200b.

[0061] Please continue reading Figure 2 The first heating element 300 is located in the hot air cavity 200a. The wind 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. The electric heating tube has a complete structure and an insulation layer and is generally suitable for environments that require high temperature heating. Therefore, in this embodiment, the electric heating tube is preferably used.

[0062] Specifically, the first heating element 300 is a tubular structure. The first heating element 300 can be distributed in a circular ring shape or a rectangular shape, and is arranged around the centrifugal fan 400. The hot air blown out from the air outlet side of the centrifugal fan 400 is first heated by the first heating element 300, and then flows out through the upper air outlet 20a. In this way, the efficiency of hot air heating can be improved.

[0063] See also Figure 3-Figure 6 It should be particularly pointed out that, along the centrifugal direction of the hot air thrown out from the air outlet side of the centrifugal fan 400, 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.

[0064] Specifically, the centrifugal fan 400 is Figure 3 as well as Figure 5 The rotation direction in is clockwise, and the centrifugal fan 400 is Figure 4 as well as Figure 6 The direction of rotation is counterclockwise. Figure 3 From the perspective of viewing angle, the centrifugal direction of the wind thrown out from the air outlet side of the centrifugal fan 400 is roughly clockwise. At this time, for any upper air outlet 20a, along the centrifugal direction, its left side wall is closer to the air outlet side of the centrifugal fan 400, therefore, the left side wall is the first upper side wall 20b, and its right side wall is farther away from the air outlet side of the centrifugal fan 400, therefore, the right side wall is the second upper side wall 20c.

[0065] On the contrary, Figure 6 From a visual angle, the centrifugal direction of the wind thrown out from the air outlet side of the centrifugal fan 400 is roughly counterclockwise. At this time, for any upper air outlet 20a, along the centrifugal direction, its right side wall is closer to the air outlet side of the centrifugal fan 400, therefore, the right side wall is the first upper side wall 20b, and its left side wall is farther away from the air outlet side of the centrifugal fan 400, therefore, the left side wall is the second upper side wall 20c.

[0066] See also Figure 3 by Figure 5 The hot air hood 100 further includes an upper flow guide reversing member 30. The upper flow guide reversing member 30 is arranged one by one corresponding to the plurality of upper air outlets 20a and connected to the upper shell 20, that is, the upper flow guide reversing member 30 is located in the path of hot air flowing from the hot air cavity 200a into the cooking cavity 200b. And the upper side flow guide reversing member 30 is at least arranged on the side where the second upper side wall 20c is located, so as to divert the thrown hot air and switch the movement direction of the hot air thrown out on the air outlet side from the original centrifugal direction to the flow guide direction of the upper side flow guide reversing member 30. In this way, the hot air generated in the hot air chamber 200a can be prevented from flowing along the original centrifugal direction to one side of the cooking chamber 200b, thereby preventing heat from being concentrated on one side, and further preventing the heat from flowing directly from top to bottom when concentrated on one side, resulting in insufficient contact between the hot air and the food on the upper steaming and baking plate 600. Therefore, in this embodiment, the hot air can be made to flow more to the middle of the cooking chamber 200b, thereby reducing the unevenness of steaming and baking, thereby evenly steaming and baking the food.

[0067] For example, see Figure 1 , the hot air cover 100 is arranged on the left side of the cooking cavity 200b. If the upper air outlet 20a is not provided with an upper side flow guide reversing member 30, as Figure 7 As shown, Figure 7Observing the streamline diagram of the hot air from a top view when the upper guide reversing member 30 is not provided, the hot air flowing out from the upper air outlet 20a will be blown more toward the inside or outside of the cooking cavity 200b, so that the hot air cannot more fully contact the food on the steaming and baking tray 600, thereby reducing the cooking efficiency.

[0068] like Figure 8 As shown, Figure 8 Observe the streamline diagram of the hot air when the upper flow guide reversing member 30 is set from a top view. After the upper flow guide reversing member 30 is set on the second upper side wall 20c of the upper air outlet 20a, the thrown hot air can be diverted to switch the movement direction of the hot air thrown out on the air outlet side from the original centrifugal direction to the guide direction of the upper flow guide reversing member 30, so that the hot air can flow more toward the middle of the cooking cavity 200b, thereby evenly steaming and baking the food.

[0069] In terms of cooking uniformity, when the steaming and baking tray 600 is a single-layer, the hot air can be blown more to the opposite side of the hot air hood 100, thereby improving the steaming and baking uniformity of different positions of the single-layer steaming and baking tray 600; when the steaming and baking tray 600 is a multi-layer, after the hot air reaches the opposite side of the hot air hood 100, the hot air flows downward to heat the food on the steaming and baking tray 600 of the middle layer, and flows back to the hot air cavity 200a from the return air port 10a, so that the steaming and baking tray 600 of the middle layer can also be baked by forced convection hot air, thereby improving the baking uniformity of food on the steaming and baking trays 600 of different layers.

[0070] For further information, see Figure 3-4 In one embodiment, the upper flow guide reversing member 30 is arranged on the side of the upper shell 20 away from the centrifugal fan 400, that is, located in the cooking cavity 200b. In this way, the upper flow guide reversing member 30 can directly guide the wind direction of the hot air entering the cooking cavity 200b, and achieve more precise guidance of the hot air in the cooking cavity 200b.

[0071] In other embodiments, the upper air flow guide reversing member 30 is disposed on the side of the upper shell 20 facing the centrifugal fan 400, that is, located in the hot air chamber 200a of the cooking appliance. Generally, users mostly perform hygienic cleaning on the cooking chamber 200b, so when the upper air flow guide reversing member 30 is located in the hot air chamber 200a of the cooking appliance, the risk of cutting hands can be greatly reduced.

[0072] It can be understood that the upper air guide reversing member 30 is located on the path of the hot air thrown out by the centrifugal fan 400, no matter whether it is in the hot air chamber 200a or the cooking chamber 200b.

[0073] Furthermore, the upper flow guide reversing member 30 is formed on the upper shell 20 by press forming, and the upper shell 20 is formed with an upper air outlet 20a. By press forming, the upper flow guide reversing member 30 and the upper air outlet 20a can be easily formed, and the structure is relatively stable and not easy to deform.

[0074] In another embodiment, the upper air guide reversing member 30 and the upper shell 20 are split structures and are connected to each other by a split structure connection method, such as welding and bolt connection. This method has relatively low requirements on the ductility of the material. Therefore, lower cost materials can be selected to make the hot air hood 100.

[0075] In the split structure, the upper air flow guiding and reversing member 30 may be arranged along the edge of the upper air outlet 20a, or may be arranged close to the upper air outlet 20a, and may be arranged specifically according to actual conditions.

[0076] See also Figure 5 In some embodiments, the upper air flow guide reversing member 30 may extend to the upper side wall of the upper air outlet 20a, or to the lower side wall of the upper air outlet 20a, or to both the upper side wall and the lower side wall of the upper air outlet 20a.

[0077] When the upper flow guide reversing member 30 extends to the upper side wall of the upper air outlet 20a, the extended part is also in the path of the hot air thrown out by the centrifugal fan 400, playing a certain auxiliary flow guiding role, which can change the direction of a part of the hot air that originally flowed directly toward the top wall of the cooking cavity 200b, so that this part of the hot air is directly blown into the cooking cavity 200b, making it easier for this part of the hot air to be blown to the opposite side of the hot air hood 100.

[0078] When the upper flow guide reversing member 30 extends to the lower side wall of the upper air outlet 20a, the wind direction of the hot air blown out from the upper air outlet 20a can be guided, reducing the direct blowing of hot air onto the food near the upper air outlet 20a on the top steaming and baking tray 600, thereby preventing the food there from becoming darker in color, and allowing more hot air to be blown to the opposite side of the hot air hood 100.

[0079] On the basis of the upper side flow guide reversing member 30 extending toward the upper side wall and the lower side wall of the upper air outlet 20a, when the upper side flow guide reversing member 30 of this embodiment adopts a flange structure, that is, the upper side flow guide reversing member 30 is formed by flanged along the wall of the upper air outlet 20a of the upper shell 20, in order to consider the structural design of the flange, to avoid the flange being too straight and resulting in the inability to form a flange structure, that is, to avoid cracking on the upper or lower side of the upper side flow guide reversing member 30 during flanging, it is designed that the upper side flow guide reversing member 30 extends from the second upper side wall 20c to the upper side wall, and along the extension direction, the protruding height of the upper side flow guide reversing member 30 relative to the upper side shell 20 gradually decreases, and the upper side flow guide reversing member 30 extends from the second upper side wall 20c to the lower side wall, and along the extension direction, the protruding height of the upper side flow guide reversing member 30 relative to the upper side shell 20 gradually decreases.

[0080] In one embodiment, please continue to see Figure 5 The upper flow guide reversing member 30 has an upper flow guide reversing surface 30a, and part of the upper flow guide reversing surface 30a serves as the mouth wall of the upper air outlet 20a, that is, the upper flow guide reversing member 30 adopted in this embodiment can be arranged along the edge of the upper air outlet 20a, so that the mouth wall of the upper air outlet 20a is smoothly transitioned and connected with the upper flow guide reversing member 30. This arrangement enables the hot air passing through the upper air outlet 20a to flow quickly along the upper flow guide reversing surface 30a, thereby reducing the flow resistance of the hot air flowing through the upper air outlet 20a and the upper flow guide reversing member 30, and thus making it easier to change the hot air from the original centrifugal direction to the guide direction of the upper flow guide reversing member 30.

[0081] Furthermore, the upper guide reversing surface 30a also extends to the upper side wall and the lower side wall of the upper air outlet 20a, and the upper side guide reversing surface 30a is an arcuate surface, which can reduce the resistance of the hot air flow. At the same time, since the upper side guide reversing surface 30a also extends to the upper side wall and the lower side wall of the upper air outlet 20a, it can play a certain role in gathering wind, so that the hot air flowing out through the upper air outlet 20a can flow along the upper side guide reversing surface 30a as much as possible, thereby achieving a better guiding effect, and the hot air is more easily blown to the opposite side of the hot air hood 100.

[0082] See also Fig. 9 The angle A between the upper shell 20 and the main shell 10 is not less than 135° and not less than 170°. The angle A can specifically be 135°, 145°, 155°, 165° and 170°.

[0083] Fig.10 The hot air flow direction of the related art and the present embodiment is shown in the front view. Fig.10 As shown in the left figure, in the related art, the hot air is blown vertically upward toward the top wall of the cooking cavity 200b. In this embodiment, the angle A between the upper shell 20 and the main shell 10 is set to the above range, such as Fig.10As shown in the middle right figure, the hot air blown out from the upper shell 20 is blown obliquely toward the opposite side of the hot air hood 100 toward the top wall of the cooking cavity 200b, that is, the collision position of the hot air and the top wall of the cooking cavity 200b is closer to the middle of the top wall of the cooking cavity 200b. In this way, the flow resistance of the hot air is reduced, and the path of the hot air to the opposite side of the hot air hood 100 is also shortened, so that the hot air can be effectively blown to the opposite side and flow downward along the side wall of the opposite side, thereby evenly steaming and baking multiple layers of food.

[0084] When the angle A is less than 135°, the hot air will be blown toward the top wall of the cooking cavity 200b at a more vertical upward angle, which increases the flow path of the hot air to the hot air hood 100, so that the hot air cannot be effectively blown toward the opposite side. When the angle A is greater than 170°, only a small part of the hot air on the outlet side of the centrifugal fan 400 can be thrown out through the upper air outlet 20a, and the hot air cannot be effectively guided by the upper side guide reversing member 30.

[0085] In some embodiments, Fig.11 As shown, the angle B between the flow direction of the upper flow guide reversing member 30 and the upper shell 20 is not less than 85° and not greater than 95°. Specifically, the angle B can be 85°, 90° and 95°. When the angle B is between 85° and 95°, by limiting the angle B, the hot air guided by the upper flow guide reversing member 30 can flow to the opposite side of the hot air hood 100 as vertically as possible, 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 angle B is less than 85° or greater than 95°, the hot air will still flow toward the side wall adjacent to the hot air hood 100.

[0086] Please continue to refer to Fig.11 , the maximum protrusion height a of the upper flow guide reversing member 30 relative to the upper shell 20 is not less than 3mm and not more than 8mm, and the value of a can be 3mm, 4mm, 5mm, 6mm, 7mm and 8mm. If the protrusion height a exceeds 8mm, it is easy to touch the fingers, especially when cleaning. The higher the protrusion height, the higher the risk of cutting the hands. If the protrusion height a is less than 3mm, when the hot air passes through the upper flow guide reversing member 30, the guide stroke of the upper flow guide reversing member 30 is small, and there is no obvious guide effect. When the maximum protrusion height a of the upper flow guide reversing member 30 relative to the upper shell 20 is not less than 3mm and not more than 8mm, not only the guide effect is good, but also the risk of cutting the hands is small.

[0087] Furthermore, multiple upper air outlets 20a are arranged in a row along the horizontal direction, and along the horizontal direction, the upper air outlets 20a all have an upper opening size b; the upper side flow guide reversing member 30 has a maximum protrusion height a relative to the upper side shell 20; wherein a≤b≤2a, wherein b can be equal to a or 2a, or can be 1.2a, 1.4a, 1.5a and 1.8a.

[0088] When the upper flow guide reversing member 30 is a flange structure, in order to achieve flanging, the upper opening size b of the upper air outlet 20a needs to be greater than or equal to the maximum protrusion height a of the upper flow guide reversing member 30 relative to the upper shell 20, otherwise flanging cannot be performed, but the opening size b cannot be too large, that is, it cannot exceed twice the value of a, otherwise only a small part of the hot air thrown out by the centrifugal fan 400 will be guided and reversed by the upper flow guide reversing member 30, and most of the hot air will directly enter the cooking cavity 200b without being reversed by the upper flow guide reversing member 30.

[0089] Therefore, when b satisfies a≤b≤2a, the flange condition of the upper flow-guiding reversing member 30 can be met, and most of the hot air can pass through the upper flow-guiding reversing member 30, thereby achieving reversal.

[0090] See also Fig.11 In order to better achieve steaming and baking of multi-layered food, the hot air hood 100 also includes a lower shell 40 and a lower flow guide reversing member 50.

[0091] The lower shell 40 is connected to the bottom end of the main shell 10 and is set at an angle to the main shell 10. The lower shell 40 has a plurality of lower air outlets 40a corresponding to the air outlet side of the centrifugal fan 400. Along the centrifugal direction of the hot air thrown out from the air outlet side, the lower air outlet 40a has a first lower side wall 40b relatively close to the air outlet side and a second lower side wall 40c relatively far from the air outlet side. Through the setting of the lower air outlet 40a, the hot air can also flow out through the lower air outlet 40a, thereby baking the food on the steaming and baking tray 600 near the bottom of the cooking cavity 200b, further improving the uniformity of steaming and baking of multi-layer food.

[0092] The lower flow guide reversing member 50 is arranged in one-to-one correspondence with multiple lower air outlets 40a and is connected to the lower shell 40, and the lower flow guide reversing member 50 is at least arranged on the side where the second lower side wall 40c 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 guide direction of the lower flow guide reversing member 50. The lower flow guide reversing member 50 is similar to the upper flow guide reversing member 30, and is also in the path of the hot air flow. It can divert the hot air passing through the lower air outlet 40a to avoid the hot air concentrating on one side under the action of centrifugal force, resulting in uneven steaming and baking of food. Therefore, the lower flow guide reversing member 50 can make the hot air flow more to the middle of the cooking cavity 200b, so as to evenly steam and bake the food.

[0093] It should be understood that the lower flow-guiding reversing member 50 and the upper flow-guiding reversing member 30 may have the same structure, the same function, and the same parameter range. For example, the angle between the flow-guiding direction of the lower flow-guiding reversing member 50 and the lower shell 40 is not less than 85° and not greater than 95°, the maximum protrusion height of the lower flow-guiding reversing member 50 relative to the lower shell 40 is also a, and a is not less than 3 mm and not greater than 8 mm, and multiple lower air outlets 40a are arranged in rows along the horizontal direction. Along the horizontal direction, the lower air outlets 40a all have an upper opening size of b, which also satisfies a≤b≤2a. The features of the lower flow-guiding reversing member 50 and the upper flow-guiding reversing member 30 may also be different.

[0094] For example, see Fig. 9 In order to prevent the hot air flowing out from the lower air outlet 40a into the cooking cavity 200b from being blocked by the steam-bake tray 600, the angle C between the lower shell 40 and the main shell 10 is not less than 90° and not more than 140°. The specific value of the angle C can be designed according to the actual height of the steam-bake tray 600, and can be 90°, 100°, 110°, 120°, 130° and 140°.

[0095] See also Figure 3-4 as well as Figure 6 It can be understood that in order to further ensure the uniformity of food steaming and baking, the hot air hood 100 also includes at least one of a left shell 60 and a right shell 70, the left shell 60 is connected to the main shell 10, the upper shell 20 and the lower shell 40, and has a left air outlet (not shown in the figure), and the right shell 70 is connected to the main shell 10, the upper shell 20 and the lower shell 40 and is arranged back to back with the left shell 60, and has a right air outlet (not shown in the figure).

[0096] The left air outlet and the right air outlet are closer to the return air outlet 10a than the upper air outlet 20a and the lower air outlet 40a. There can be one left air outlet and multiple right air outlets. For the steaming and baking tray 600 located in the middle or at the bottom, each steaming and baking tray 600 can be provided with a corresponding left air outlet or a right air outlet.

[0097] In this embodiment, hot air flows out through the upper air outlet 20a and the lower air outlet 40a, and flows along the top and the bottom of the cooking cavity 200b to the opposite side of the hot air hood 100 respectively, and then the hot air flows back from the opposite side, so when it reaches the return air outlet 10a, the heat and temperature have dropped. 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 been reduced at the return air outlet 10a, and the food is baked near the return air outlet 10a, which can further improve the uniformity.

[0098] Furthermore, the total opening area of ​​the left air outlet and the right air outlet is smaller than the area of ​​the multiple upper air outlets 20a and the total opening area of ​​the multiple lower air outlets 40a, so that the flow rate of the hot air derived from the upper air outlet 20a and the lower air outlet 40a during return flow is greater than the flow rate of the hot air derived from the left air outlet and the right air outlet. At this time, it is easy to form a "suction effect" between the left air outlet and the return air outlet 10a, and between the right air outlet and the return air outlet 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 at the return air outlet 10a has dropped, thereby increasing the heat of the hot air at the return air outlet 10a, and baking the food near the return air outlet 10a, to avoid uneven baking of the food near the return air outlet 10a and the food at other positions due to the obvious drop in temperature and heat of the hot air returning to the return air outlet 10a when the left air outlet and the air outlet are not opened.

[0099] In this embodiment, in order to ensure the beauty of the hot air hood 100 and the uniformity of steaming and baking food, the hot air hood 100 preferably includes a left shell 60 and a right shell 70, and the left air outlet on the left shell 60 is mirror-symmetrical with the right air outlet on the right shell 70.

[0100] However, combined with Figure 1 as well as Figure 6 It can be seen that when the front and rear distance of the steam oven is small, at this time, since the left air outlet and the right air outlet are respectively located at the front and rear sides of the return air outlet 10a, the distance between the left air outlet and the right air outlet and the return air outlet 10a will be very close. At this time, the "scrolling 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 chamber 200a by the return air at the return air outlet 10a. Therefore, the left air outlet and the right air outlet cannot play the above-mentioned role, and will aggravate the uneven baking between different layers of the steam-baking trays 600. At this time, the left air outlet and the right air outlet may not be opened.

[0101] In some embodiments, see Figure 1 The hot air hood 100 is arranged on the left side of the cooking cavity 200b. In other embodiments, the hot air hood 100 is arranged on the right side or the inner side of the cooking cavity 200b. When the hot air hood 100 is arranged on the left side, right side or inner side of the cooking cavity 200b, compared with setting the hot air hood 100 on the top side or the bottom side of the cooking cavity 200b, the hot air can flow between the steaming and baking trays 600 in the middle layer to achieve multi-layer baking. The hot air will not be blocked by the steaming and baking trays 600, thereby improving the uniformity of steaming and baking of multi-layer food.

[0102] When the hot air hood 100 is located on the left or right side, the setting of the upper flow guide reversing member 30 can prevent the hot air from concentrating on the outside (i.e., the opening side) or the inside of the cooking cavity 200b. When the hot air hood 100 is located on the inside of the cooking cavity 200b, the setting of the upper flow guide reversing member 30 can prevent the hot air from concentrating on the left or right side of the cooking cavity 200b.

[0103] See also Figure 2-4 The projection of the rotation range of the centrifugal fan 400 on the main shell 10 covers the area where the return air port 10a is located. In this way, the wind on the air outlet side of the centrifugal fan 400 will not flow out through the return air port 10a, which can avoid the "entrainment effect" and thus avoid uneven steaming and baking of food.

[0104] See also Figure 1 In some embodiments, the cooking appliance further includes a second heating element 500, which may be an electric heating structure such as a heating wire or a heating tube. The electric heating tube has a complete structure and an insulation layer and is generally suitable for environments requiring high-temperature heating. Therefore, in this embodiment, the second heating element 500 is preferably an electric heating tube.

[0105] The second heating element 500 is located at least on one of the upper side (or top side) of the cooking cavity 200b and the lower side (or bottom side) of the cooking cavity 200b.

[0106] 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 on both the upper side and the lower side of the cooking cavity 200b. It can be specifically designed according to the actual steaming and baking food and the heating power. In addition, the second heating element 500 can also perform auxiliary heating on the hot air flowing through the upper side or the lower side, and the hot air is directly blown to the second heating element 500, thereby 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 of food or the lower layer of food, reducing the heat exchange difference between the upper and lower layers and the middle layer of food, thereby improving the baking efficiency of the food while improving the baking uniformity of different layers of food.

[0107] The same or similar numbers in the drawings of this embodiment correspond to the same or similar items; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, it is based on the orientation or position relationship described in the drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0108] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hot air hood, It is characterized in that Used to cooperate with the centrifugal fan of the cooking utensil, the hot air hood comprises: a main housing having a return air port corresponding to the return air side of the centrifugal fan; an upper shell connected to the top of the main shell and arranged at an angle with the main shell, and the upper shell has a plurality of upper air outlets corresponding to the air outlet side of the centrifugal fan, and 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; and The upper side flow guide reversing member is arranged one by one corresponding to the multiple upper air outlets and connected to the upper side shell, and the upper side flow guide reversing member is arranged at least 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 guide direction of the upper side flow guide reversing member.

2. The hot air hood according to claim 1, It is characterized in that The upper flow guide reversing member is arranged on a side of the upper shell facing the centrifugal fan; and / or, The upper flow guide reversing member is arranged on a side of the upper shell facing away from the centrifugal fan.

3. The hot air hood according to claim 1, It is characterized in that The upper flow guide reversing member is formed by press forming on the side of the upper shell away from the centrifugal fan, so that the upper shell forms the upper air outlet; or, The upper flow guide reversing member and the upper shell are separate structures and are connected to each other.

4. The hot air hood according to claim 1, It is characterized in that The upper air flow guiding and reversing member also extends to the upper side wall and / or the lower side wall of the upper air outlet.

5. The hot air hood according to claim 4, It is characterized in that The upper flow guide reversing member extends from the second upper side wall to the upper side wall, and along the extending direction, the protrusion height of the upper flow guide reversing member relative to the upper side shell gradually decreases; and / or, The upper flow guide and reversing member will extend from the second upper side wall to the lower side wall, and along the extending direction, the protruding height of the upper flow guide and reversing member relative to the upper shell will gradually decrease.

6. The hot air hood according to claim 1, It is characterized in that The upper flow guiding and reversing member has an upper flow guiding and reversing surface, and a portion of the upper flow guiding and reversing surface serves as an outlet wall of the upper air outlet.

7. The hot air hood according to claim 6, It is characterized in that The upper flow guiding and reversing surface also extends to the upper side wall and the lower side wall of the upper air outlet, and the upper flow guiding and reversing surface is an arc-shaped surface.

8. The hot air hood according to claim 1, It is characterized in that The upper flow guide reversing member meets at least one of the following conditions: The angle between the flow guide direction and the upper shell is not less than 85° and not more than 95°; The maximum protrusion height of the upper flow guide reversing member relative to the upper shell is not less than 3 mm and not more than 8 mm.

9. The hot air hood according to claim 1, It is characterized in that The plurality of upper air outlets are arranged in a row along the horizontal direction, and along the horizontal direction, the upper air outlets all have an upper opening size b; The upper flow guide reversing member has a maximum protrusion height a relative to the upper shell; Among them, a≤b≤2a.

10. The hot air hood according to claim 1, It is characterized in that The included angle between the upper shell and the main shell is not less than 135° and not less than 170°.

11. The hot air hood according to claim 1, It is characterized in that Also includes: A lower shell connected to the bottom end of the main shell and arranged at an angle with the main shell, and the lower shell has a plurality of lower air outlets corresponding to the air outlet side of the centrifugal fan, and along the centrifugal direction of the hot air thrown out from the air outlet side, the lower air outlet has a first lower side wall relatively close to the air outlet side and a second lower side wall relatively far from the air outlet side; as well as The lower side flow guide reversing member is arranged one by one corresponding to the multiple lower air outlets and connected to the lower side shell, and the lower side flow guide reversing member is arranged at least on the side where the second lower 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 guide direction of the lower side flow guide reversing member.

12. The hot air hood according to claim 11, It is characterized in that The included angle between the lower shell and the main shell is not less than 90° and not more than 140°.

13. The hot air hood according to claim 11, It is characterized in that Also includes: 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, 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.

14. A cooking utensil, It is characterized in that include: The hot air hood according to any one of claims 1 to 10; A box body, wherein the hot air hood is installed in the box body and divides the internal space of the box body into a hot air chamber and a cooking chamber, wherein the hot air chamber is connected to the cooking chamber through the upper air outlet and the return air outlet; A first heating element, the first heating element is disposed in the hot air cavity, and the first heating element is used to heat the air in the hot air cavity; as well as A centrifugal fan is arranged in the hot air cavity, and a return air side of the centrifugal fan is arranged corresponding to the return air port so as to suck the air in the cooking cavity into the hot air cavity through the return air port, and an outlet air side of the centrifugal fan corresponds to the upper air outlet so as to blow the air in the hot air cavity into the cooking cavity through the upper air outlet.

15. The cooking appliance according to claim 14, It is characterized in that The hot air cover is arranged on the left side, the right side or the inner side of the cooking cavity.

16. The cooking appliance according to claim 14, It is characterized in that The projection of the rotation range of the centrifugal fan on the main housing covers the area where the return air outlet is located.

17. The cooking appliance according to claim 14, It is characterized in that The first heating element is a tubular structure and is arranged around the centrifugal fan.

18. The cooking appliance according to any one of claims 14 to 17, It is characterized in that Also includes: a second heating element, the second heating element being located at an upper side of the cooking cavity; And / or, the second heating element is located at the lower side of the cooking cavity.

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