Fan baffle, fan assembly and cooking equipment

Abstract

The invention relates to a fan baffle, a fan assembly and cooking equipment. The fan baffle comprises a ventilation plate and a covering part, and the ventilation plate is provided with an air return port penetrating through the ventilation plate; the covering part is connected to the ventilation plate, the covering part is aligned to the air return opening and covers the air return opening, and a gap exists between the covering part and the ventilation plate in the axial direction of the air return opening so that an air return channel communicating with the air return opening can be formed. According to the scheme, on the basis of guaranteeing the functionality, the attractiveness of the visual effect is considered, on the other hand, in the return air flowing process, oil dirt carried by return air is mainly attached to the flat surfaces of the ventilation plate and the covering part, the interior of the cooking cavity of the inner container can be directly cleaned, and the cleanliness of the draught fan baffle is improved.

Description

Technical Field

[0001] The present application relates to the field of household appliance technology, and in particular to a fan baffle, a fan assembly and a cooking device. Background Art

[0002] Steam ovens typically have a hot air system installed on the back of the inner pot. This system connects to the cooking chamber inside the pot via a hot air blower baffle, creating a hot air circulation system. Specifically, hot air generated by the hot air system is blown into the inner pot through the hot air outlet on the hot air blower baffle. The air inside the pot is then drawn back through the return air vents on the hot air blower baffle, creating a hot air circulation system.

[0003] In existing technology, hot air return vents are typically arrayed, with the hot air blower blades utilizing an open impeller. However, this arrangement has the following disadvantages: 1. The arrayed return vents are densely packed, making them difficult to clean once grease accumulates; 2. The open impeller blades are inefficient, resulting in low circulating air volume and pressure; 3. The hot air blower blades and heating tubes are visible directly from the back of the inner tank, creating an unsightly visual effect. Summary of the Invention

[0004] Based on this, it is necessary to provide a fan baffle, a fan assembly and a cooking device to address the problems that the fan baffle in the hot air system is difficult to clean, the hot air efficiency is low and the aesthetics is poor.

[0005] A fan baffle, which includes a ventilation plate and a cover, wherein the ventilation plate is provided with a return air outlet passing through the ventilation plate; the cover is connected to the ventilation plate, and the cover is at the return air outlet, and the cover covers the return air outlet, and there is a gap between the cover and the ventilation plate in the axial direction of the return air outlet to form a return air channel connected to the return air outlet.

[0006] In one embodiment, the ventilation plate includes an outer ring plate and a transition section inner ring plate, and the return air port is opened on the inner ring plate.

[0007] In one embodiment, the ventilation plate further includes a transition section connected between the outer ring plate and the inner ring plate, and the transition section is inclined at a downward slope toward the return air outlet so that the outer ring plate and the inner ring plate form a height difference in the axial direction of the return air outlet.

[0008] In one embodiment, the transition section is an annular structure coaxially arranged with the return air outlet.

[0009] In one embodiment, in the axial direction of the return air outlet, the outer ring plate is closer to the inner ring plate than the cover.

[0010] In one embodiment, along the axial direction of the return air outlet, the distance between the cover and the outer ring plate is L, and L is 8 mm-15 mm.

[0011] In one embodiment, the diameter of the cover is not less than the diameter of the inner ring plate.

[0012] In one embodiment, the fan baffle further includes a connecting column, which is arranged along the axial direction of the return air outlet, and the two ends of the connecting column are respectively connected to the ventilation plate and the cover.

[0013] A fan assembly comprises a fan baffle and an impeller as described in some of the above embodiments, and the ventilation plate also includes an outer edge section arranged along the outer periphery of the outer ring plate, the outer edge section extending obliquely from the outer ring plate toward the side away from the ventilation plate and away from the cover, the outer edge section, the outer ring plate and the transition section together enclose a semi-enclosed annular accommodating cavity; the impeller comprises a trailing edge cover plate and a plurality of fan blades arranged on the surface of the trailing edge cover plate, the fan blades are located at the outer edge of the end face of the trailing edge cover plate facing the fan baffle, and are distributed at intervals along the circumference of the trailing edge cover plate, the trailing edge cover plate is rotatably arranged on the side of the ventilation plate away from the cover, and the fan blades are located in the annular accommodating cavity.

[0014] In one embodiment, the fan blades are straight blades, and the fan blades are arranged along the radial direction of the trailing edge cover plate.

[0015] A cooking device comprises the fan assembly as described in any of the above embodiments.

[0016] The fan baffle provided in the above solution, by providing a return air vent on the ventilation plate and connecting a cover member covering the return air vent to the ventilation plate, allows for direct viewing of the fan baffle from the side of the ventilation plate where the cover member is located, while other components on the back of the inner pot are not directly visible. This ensures both functionality and aesthetics. Furthermore, during the return airflow, oil and dirt carried by the return air primarily adhere to the flat surfaces of the ventilation plate and the cover member, allowing for direct cleaning within the cooking cavity of the inner pot, thus enhancing the cleanability of the fan baffle.

[0017] The fan assembly provided in the above scheme utilizes the annular accommodating cavity formed by the fan baffle and places the fan blades of the semi-open impeller into the annular accommodating cavity, so that the impeller and the fan baffle together form a closed impeller-like structure, thereby improving the efficiency of the fan blades, enhancing the airflow stability of the hot air system, and thus the performance of the fan assembly. It also avoids the problem of reverse overflow of airflow at the edge of the array return air outlet of the open impeller in the prior art, and improves the temperature field uniformity of the hot air system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the exploded structure of the fan assembly in one embodiment of the present application.

[0019] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the fan assembly.

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the fan baffle.

[0021] Figure 4 for Figure 1 Schematic diagram of the structure of the middle impeller and inner ring plate.

[0022] Description of reference numerals:

[0023] 10. Fan assembly; 100. Fan baffle; 110. Ventilation plate; 111. Return air outlet; 112. Air outlet; 113. Outer ring plate; 114. Transition section; 115. Inner ring plate; 116. Outer edge section; 117. Annular accommodating cavity; 120. Cover; 130. Connecting column; 140. Return air duct; 200. Impeller; 210. Trailing edge cover plate; 220. Fan blade; 230. Heating element. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which 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, and therefore cannot be understood as a limitation on this application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0030] The present application provides a cooking device comprising a fan assembly 10 according to any of the following embodiments, an inner container, and a hot air system located outside the inner container. The inner container is provided with a cooking cavity, and the hot air system is provided with a warm air cavity. The fan assembly 10 is installed between the hot air system and the inner container and is used to exchange gas between the cooking cavity and the warm air cavity, thereby forming a warm air circulation between the cooking cavity and the warm air cavity. Alternatively, the cooking device may be a steamer, a steam oven, or other cooking device.

[0031] See Figure 1 , Figure 1 The structure of the blower assembly 10 in one embodiment of the present application is shown in FIG. Figure 2 , Figure 2 A schematic cross-sectional view of a fan assembly 10 in one embodiment of the present application is shown. This embodiment provides a fan assembly 10 comprising a fan baffle 100 and an impeller 200 as described in some of the following embodiments. In this embodiment, the fan assembly 10 is a hot air blower and further comprises a heater 230 located on the side of the impeller 200 facing away from the fan baffle 100. The heater 230 is configured to heat the airflow to form hot air. In this embodiment, the heater 230 utilizes an electric heating tube.

[0032] Combine Figure 3 , Figure 3 FIG. 1 shows a schematic structural diagram of a fan baffle 100 in an embodiment of the present application. Figure 3 As shown, an embodiment of the present application provides a fan baffle 100 , which includes a ventilation plate 110 and a cover 120 .

[0033] like Figure 1 As shown, the ventilation plate 110 is provided with a return air port 111 that passes through the ventilation plate 110, which is used for the air flow to return to the side where the impeller 200 is located after circulation, and the gas in the cooking cavity of the inner pot in the cooking device flows to the warm air cavity of the hot air system. Figure 1 As shown, the return air outlet 111 is arranged at the center position of the ventilation plate 110. Preferably, the axis of the return air outlet 111 coincides with the rotation center of the impeller 200. During the operation of the impeller 200, the air flow pressure at the position of the return air outlet 111 is low, so that the air flow on the other side of the fan baffle 100 can flow to the side where the impeller 200 is located.

[0034] like Figure 1 As shown, the ventilation plate 110 is further provided with an air outlet 112 penetrating the ventilation plate 110 for air to flow from one side where the impeller 200 is located to the other side, and for the air in the warm air cavity of the hot air system in the cooking device to flow into the cooking cavity of the inner pot. Figure 1 As shown, the air outlet 112 is arranged at the corner of the ventilation plate 110. During the operation of the impeller 200, the air flow flows radially toward the periphery along the fan blade 220 and accelerates, so that the air flow pressure at the location of the air outlet 112 is high, thereby improving the gas flow efficiency.

[0035] like Figure 1 and Figure 2As shown, the cover 120 is connected to the ventilation plate 110, and the cover 120 is on the return air outlet 111, and the cover 120 covers the return air outlet 111, wherein the cover 120 covers the return air outlet 111 means that when the ventilation plate 110 is viewed from the side where the cover 120 is provided, the cover 120 can block the return air outlet 111, or means that when the ventilation plate 110 is viewed from the side away from the cover 120, the cover 120 can completely fill the return air outlet 111.

[0036] The return air outlet 111 is covered by the cover 120, so that when looking directly at the fan baffle 100 from the side of the ventilation plate 110 provided with the cover 120, only the ventilation plate 110 and the cover 120 can be observed, while the heating element 230, fan blades 220, exhaust port and other components on the back of the inner pot cannot be directly viewed, giving users a new visual experience, meeting users' psychological needs for a unique appearance of cooking equipment and a unique visual experience of the inner pot cavity, and taking into account the aesthetics of the visual effect while ensuring functionality.

[0037] like Figure 2 As shown, a gap exists between the cover 120 and the ventilation plate 110 in the axial direction of the return air port 111 to form a return air channel 140 communicating with the return air port 111 , so that the return air enters the return air port 111 through the return air channel 140 .

[0038] Due to the effect of hot air circulation, the oil and dirt generated by food during the hot air steaming and baking process are carried by the return air. During the flow of return air, the oil and dirt carried by the return air mainly adhere to the flat surfaces of the ventilation plate 110 and the cover 120, which can be directly cleaned in the cooking cavity of the inner pot, thereby improving the cleanliness of the fan baffle 100.

[0039] Furthermore, in this embodiment, there is only one return air vent 111, which is located at the center of the ventilation plate 110. For example, the diameter of the return air vent 111 is 30 mm to 70 mm. Compared to the array-type return air vents used in the prior art, the array-type return air vents have partitions between adjacent return air vents, and their total opening area is smaller than the area of ​​the return air vents 111 in this application. This reduces the loss of overall circulating air volume caused by reverse overflow of airflow at the edges of the array-type return air vents, improves the temperature uniformity of the hot air system, and ensures a longer baking time and uniformity in the cooking apparatus.

[0040] It is understood that the shape of the cover 120 is not limited, and it can be as follows Figure 1 The circular shape shown may also be an ellipse, a polygon, a petal shape, etc. In this embodiment, the cover 120 is described as a circular structure, but this is not limiting.

[0041] In one embodiment, the ventilation plate 110 includes an outer ring plate 113 and an inner ring plate 115, and the return air outlet 111 is opened on the inner ring plate 115. Optionally, the outer ring plate 113 and the inner ring plate 115 are located in the same plane, and the cover 120 is spaced apart from the inner ring plate 115, and the space between the cover 120 and the inner ring plate 115 forms a return air channel 140.

[0042] like Figure 1 and Figure 2 As shown, in one embodiment, the ventilation plate 110 further includes a transition section 114, that is, the ventilation plate 110 includes an outer ring plate 113, a transition section 114 and an inner ring plate 115 connected in sequence, and as shown in FIG. Figure 2 As shown, the transition section 114 is arranged with a downward slope toward the return air outlet 111, that is, it is inclined from the outer ring plate 113 to the inner ring plate 115 toward the side of the ventilation plate 110 away from the cover 120, so that the outer ring plate 113 and the inner ring plate 115 form a height difference h in the axial direction of the return air outlet 111. The inner ring plate 115 where the return air outlet 111 is located adopts a concave structure to guide the hot return air through the inclined transition section 114, reducing the return air resistance and allowing the hot return air flow to bypass the cover 120 and be directed to the central core negative pressure area of ​​the fan blade 220, thereby enhancing the stability of the hot air flow.

[0043] like Figure 1 As shown, in one embodiment, the transition section 114 is an annular structure coaxially arranged with the return air port 111, so that the hot return air can evenly enter the return air port 111 through the guiding effect of the transition section 114, thereby improving the stability and uniformity of the hot air flow.

[0044] In one embodiment, in the axial direction of the return air outlet 111, the outer ring plate 113 is closer to the inner ring plate 115 than the cover 120, that is, Figure 2 As shown, the cover 120 is higher than the outer ring plate 113. On the one hand, the width of the return air channel 140 is sufficient for the hot air to pass through, and turbulence and turbulence are avoided in the return air channel 140 due to the narrowness of the return air channel 140. On the other hand, the airflow guided by the transition section 114 is prevented from flowing to the surface of the cover 120 instead of entering the return air channel 140, resulting in low hot air circulation efficiency.

[0045] It is understood that the size of the return air vent 111 of the fan baffle 100 is set according to the volume of the inner pot's cooking cavity. Preferably, the diameter of the return air vent 111 is no less than half the diameter of the inner ring plate 115, and preferably, no less than 0.8 times the diameter of the inner ring plate 115. This maximizes the area of ​​the return air vent 111, reduces the loss of overall circulating air volume caused by reverse overflow of airflow at the edges of the array-type return air vents, improves the temperature uniformity of the hot air system, and ensures a consistent baking time and uniformity in the cooking apparatus.

[0046] When the distance L between the cover 120 and the outer ring plate 113 is too large, the return air volume of the return air duct 140 is large, and the air guiding effect of the transition section 114 can only act on the return air near the transition section 114, and cannot act on the return air passing through the entire return air duct 140, resulting in poor air guiding effect. When the distance L between the cover 120 and the outer ring plate 113 is too small, the return air volume of the return air duct 140 will be limited. In one embodiment, the distance L between the cover 120 and the outer ring plate 113 along the axial direction of the return air outlet 111 is 8 mm to 15 mm.

[0047] The diameter of the cover 120 is set according to the size of the return air outlet 111, such as Figure 3 As shown, in one embodiment, the diameter of the cover 120 is not less than the diameter of the inner ring plate 115, so that the inner ring plate 115 is shielded by the cover 120, so that when looking directly at the fan baffle 100 from the side of the ventilation plate 110 provided with the cover 120, only the ventilation plate 110 and the cover 120 can be observed, and the inner ring plate 115 cannot be seen directly, and the heating element 230, fan blades 220, exhaust port and other components on the back of the inner tank cannot be seen, so as to further optimize the aesthetics of the visual effect.

[0048] Preferably, the diameter of the cover 120 is larger than the diameter of the inner ring plate 115, so as to provide a coaxial error space during installation. For example, the cover 120 is circular and has a diameter of 70 mm, and the diameter of the inner ring plate 115 is 53 mm.

[0049] like Figure 1 and Figure 2 As shown, in one embodiment, the fan baffle 100 further includes a connecting post 130, which is arranged axially along the return air port 111. The connecting post 130's ends are respectively connected to the ventilation plate 110 and the cover 120. Exemplarily, the connecting post 130 is a stud to enhance the connection strength between the ventilation plate 110 and the cover 120. In this embodiment, the connecting post 130 is mounted on the inner ring plate 115 to simplify installation.

[0050] In some embodiments, as Figure 1 and Figure 2 As shown, the ventilation plate 110 also includes an outer edge section 116 arranged along the outer periphery of the outer ring plate 113. The outer edge section 116 extends obliquely from the outer ring plate 113 toward the side away from the ventilation plate 110 and away from the cover 120. The outer edge section 116, the outer ring plate 113 and the transition section 114 together enclose a semi-enclosed annular accommodating cavity 117.

[0051] like Figure 1 、 Figure 2 and Figure 4As shown, the impeller 200 includes a trailing edge cover plate 210 and a plurality of blades 220 arranged on the surface of the trailing edge cover plate 210. The blades 220 are located on the outer edge of the end surface of the trailing edge cover plate 210 facing the fan baffle 100 and are distributed at intervals along the circumference of the trailing edge cover plate 210. The trailing edge cover plate 210 is rotatably arranged on the side of the ventilation plate 110 away from the cover 120. The trailing edge cover plate 210 is coaxially arranged with the return air outlet 111, and the blades 220 are located in the annular accommodating cavity 117.

[0052] In the fan, the performance of the open impeller, semi-open impeller and closed impeller is gradually improved. The reason is that: the air is returned from the middle of the impeller 200, the trailing edge cover 210 in the semi-open impeller and the closed impeller is used to prevent the airflow from flowing to the back of the fan blade 220, and all the wind is radially guided out through the fan blade 220, and the leading edge cover in the closed impeller is used to allow the wind to flow into the core negative pressure area of ​​the fan blade 220, thereby improving the efficiency of the fan blade 220.

[0053] The trailing edge cover plate 210 and the plurality of blades 220 disposed on the surface of the trailing edge cover plate 210 form a semi-open impeller 200. The impeller 200 and the fan baffle 100 then form a structure similar to a closed impeller 200. Compared to an open impeller, the fan baffle 100 partially functions as a leading edge cover plate. Under the action of the fan baffle 100 and the trailing edge cover plate 210, when the trailing edge cover plate 210 rotates clockwise, airflow enters the blade 220 along the central axis of the blade 220, flows out radially from the blade 220, and is flung toward the air outlet 112, thereby improving the efficiency of the blade 220 and enhancing the airflow stability of the warm air chamber. This avoids the problem of reverse airflow overflow at the edge of the array return air outlet in the open impeller in the prior art, thereby improving the temperature field uniformity of the hot air system.

[0054] When fan assembly 10 is used in cooking equipment, the core negative pressure area of ​​the open impeller is connected to the blank space of the blades, resulting in significant return air leakage. This affects the stability of the hot air circulation, reduces air output, and prolongs baking time. The semi-open impeller 200, however, is a solution to this return air leakage. For the same return air, the trailing edge cover 210 and the front fan baffle 100 physically isolate the airflow, confining the hot air to the hot air chamber, enhancing airflow stability and reducing baking time.

[0055] The diameter of the trailing edge cover plate 210 in the impeller 200, the height of the fan blades 220, and the shape of the fan blades 220 are all determined by the size of the space between the heating element 230 and the back of the inner tank. In some embodiments, the fan blades 220 can be straight blades, curved blades or other non-straight blade structures. In one embodiment, the fan blades 220 are straight blades, and the fan blades 220 are arranged along the radial direction of the trailing edge cover plate 210.

[0056] The fan baffle 100 provided in the above-mentioned solution, by providing a return air port 111 on the ventilation plate 110 and connecting a cover 120 covering the return air port 111 to the ventilation plate 110, allows for direct viewing of the fan baffle 100 from the side of the ventilation plate 110 provided with the cover 120, while only the ventilation plate 110 and the cover 120 are visible, preventing direct viewing of other components on the back of the inner pot. This ensures both functionality and aesthetics. Furthermore, during the return airflow, oil and dirt carried by the return air primarily adhere to the flat surfaces of the ventilation plate 110 and the cover 120, allowing for direct cleaning within the cooking cavity of the inner pot, thereby enhancing the cleanability of the fan baffle 100.

[0057] The fan assembly 10 provided in the above scheme utilizes the annular accommodating cavity 117 formed by the fan baffle 100, and places the fan blades 220 of the semi-open impeller 200 into the annular accommodating cavity 117, so that the impeller 200 and the fan baffle 100 together form a structure similar to a closed impeller 200, thereby improving the efficiency of the fan blades 220 and enhancing the airflow stability of the hot air system. Furthermore, the performance of the fan assembly 10 avoids the problem of reverse overflow of airflow at the edge of the array return air outlet of the open impeller in the prior art, thereby improving the temperature field uniformity of the hot air system.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A fan baffle, characterized in that: The fan baffle comprises: A ventilation plate, wherein the ventilation plate is provided with an air return port running through the ventilation plate; A cover is connected to the ventilation plate, and the cover is located opposite to the return air outlet, and the cover covers the return air outlet, and there is a gap between the cover and the ventilation plate in the axial direction of the return air outlet to form a return air channel connected to the return air outlet.

2. The fan baffle according to claim 1, characterized in that: The ventilation plate includes an outer ring plate and a transition section inner ring plate, and the return air port is opened on the inner ring plate.

3. The fan baffle according to claim 2, characterized in that: The ventilation plate also includes a transition section connected between the outer ring plate and the inner ring plate, and the transition section is inclined at a downward slope toward the return air outlet so that the outer ring plate and the inner ring plate form a height difference in the axial direction of the return air outlet.

4. The fan baffle according to claim 3, characterized in that: The transition section is in an annular structure coaxially arranged with the return air outlet.

5. The fan baffle according to claim 3, characterized in that: In the axial direction of the return air outlet, the outer ring plate is closer to the inner ring plate than the cover.

6. The fan baffle according to claim 5, characterized in that: Along the axial direction of the return air outlet, the distance between the cover and the outer ring plate is L, and L is 8mm-15mm.

7. The fan baffle according to claim 2, characterized in that: The diameter of the cover is not less than the diameter of the inner ring plate.

8. The fan baffle according to claim 1, characterized in that: The fan baffle further includes a connecting column, which is arranged along the axial direction of the return air outlet, and the two ends of the connecting column are respectively connected to the ventilation plate and the cover.

9. A fan assembly, characterized in that: include: The fan baffle according to any one of claims 3 to 7, wherein the ventilation plate further comprises an outer edge section provided along the outer periphery of the outer ring plate, the outer edge section extending obliquely from the outer ring plate toward a side away from the ventilation plate and away from the cover member, the outer edge section, the outer ring plate, and the transition section jointly enclosing a semi-enclosed annular accommodating cavity; The impeller includes a trailing edge cover plate and a plurality of fan blades arranged on the surface of the trailing edge cover plate, the fan blades are located on the outer edge of the end surface of the trailing edge cover plate facing the fan baffle, and are distributed at intervals along the circumference of the trailing edge cover plate, the trailing edge cover plate is rotatably arranged on the side of the ventilation plate away from the cover, and the fan blades are located in the annular accommodating cavity.

10. The fan assembly according to claim 9, characterized in that: The fan blades are straight blades, and the fan blades are arranged along the radial direction of the trailing edge cover plate.

11. A cooking device, characterized in that: Comprising a fan assembly as claimed in claim 9 or 10.

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