Fan baffle, fan assembly and cooking equipment

Abstract

The invention relates to a fan baffle, a fan assembly and cooking equipment. The draught fan baffle comprises an outer ring plate, a transition section and an inner ring plate which are sequentially connected, the inner ring plate is provided with an air return opening penetrating through the inner ring plate in the thickness direction of the draught fan baffle, the height difference exists between the outer ring plate and the inner ring plate in the thickness direction of the draught fan baffle, and the transition section is obliquely arranged towards the inner ring plate by a downward slope. According to the fan baffle provided in the scheme, the height difference is set between the outer ring plate and the inner ring plate, the transition plate located between the outer ring plate and the inner ring plate is obliquely arranged with the downward slope, the plane where the outer ring plate is located is separated from the plane where the inner ring plate provided with the return air inlet is located, and the plane where the return air inlet is located is made to be lower than the plane where the outer ring plate is located in space; traditional front air return is optimized into sunken annular air return, and the problem that edge airflow overflows reversely at an air return opening is solved, so that the mutual influence of air return and air outlet in a hot air system in the cooking equipment is reduced, and the stability of the hot air system is enhanced.

Description

Technical Field

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

[0002] Cooking equipment, such as steam ovens, typically has a hot air system installed at 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 blower in the hot air system is blown into the inner pot through the hot air outlet on its baffle. The air inside the pot is then drawn back through the return air vent on the hot air blower baffle, creating a hot air circulation system.

[0003] In the existing technology, the hot air blower baffle adopts a frontal return air method, the baffle plane is the return air plane, and the return air outlet is directly opposite the hot air blower fan blades. Since the fan blades have a certain height and the hot air blower baffle needs to be spaced apart from the fan blades to avoid interfering with the fan blade rotation, when the fan blades drive the airflow to the return air outlet, the distance is long, and the gas flow is poorly controllable, and it is easy to cause reverse overflow of airflow at the edge of the return air outlet, affecting the uniformity of food baking. 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 problem of uneven food baking caused by overflow at the edge of the return air outlet of the fan baffle in the existing cooking device.

[0005] A fan baffle, comprising an outer ring plate, a transition section and an inner ring plate connected in sequence, wherein a return air outlet is provided on the inner ring plate along the thickness direction of the fan baffle, the outer ring plate and the inner ring plate have a height difference in the thickness direction of the fan baffle, and the transition section is inclined at a downward slope toward the inner ring plate.

[0006] In one embodiment, the inner ring plate is a circular structure and the transition section is an annular structure arranged around the inner ring plate.

[0007] In one embodiment, the number of the return air port is one, the return air port is coaxially arranged with the inner ring plate, and the diameter of the return air port is not less than half of the diameter of the inner ring plate.

[0008] In one embodiment, the inner ring plate includes a central portion and an edge portion located in the same plane, the edge portion is located on the periphery of the central portion and the edge portion is provided with a plurality of return air outlets, all of the return air outlets are distributed along the circumference of the inner ring plate, and the aperture of the return air outlet gradually decreases from the edge to the inside along the radial direction of the inner ring plate.

[0009] In one embodiment, the transition section is provided with a plurality of auxiliary return air vents, which are arc-shaped and spirally arranged in the same direction and spaced apart to form a circular ring structure.

[0010] In one embodiment, the inner ring plate further includes a lifting portion, which is located on the periphery of the edge portion and connected to the transition section. The lifting portion is inclined toward the edge portion with an upward slope, and the height difference of the edge portion in the thickness direction of the fan baffle is smaller than the height difference of the transition section in the thickness direction of the fan baffle.

[0011] In one embodiment, the height difference of the transition section in the thickness direction of the fan baffle is H, and the height difference of the lifting portion in the thickness direction of the fan baffle is h, and the range of h is 0.35H-0.7H.

[0012] In one embodiment, the inclination angle of the transition section relative to the inner ring plate is 7°-15°.

[0013] A fan assembly comprises an impeller and a fan baffle as described in any of the above embodiments, wherein the impeller comprises a plurality of blades, the blades being rotatably arranged relative to the fan baffle and being located on the side of the outer ring plate facing the inner ring plate, the diameter of the impeller being D1, the inner diameter of the outer ring plate being D2, and the range of D2 being The outer diameter of the inner ring plate is D3, and the range of D3 is

[0014] A cooking device includes the fan assembly described in the above embodiment.

[0015] The fan baffle provided in the above scheme separates the plane where the outer ring plate is located from the plane where the inner ring plate with the return air outlet is located by setting a height difference between the outer ring plate and the inner ring plate and tilting the transition plate between the two with a downward slope. In terms of space, the plane where the return air outlet is located is lower than the plane where the outer ring plate is located, and the traditional front return air is optimized into a sunken annular return air, solving the problem of reverse overflow of the edge airflow at the return air outlet, thereby reducing the mutual influence of return air and outlet air in the hot air system of the cooking equipment and enhancing the stability of the hot air system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the explosion structure of the fan assembly in one embodiment of the present application.

[0017] Figure 2 Schematic diagram of the cross-sectional structure of a fan assembly in one embodiment of the present application.

[0018] Figure 3 This is a schematic exploded view of the structure of a fan assembly in another embodiment of the present application.

[0019] Figure 4 for Figure 3 Schematic diagram of the structure of the fan baffle.

[0020] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the medium-pressure blower baffle.

[0021] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure of the fan assembly.

[0022] Description of reference numerals:

[0023] 10. Fan assembly; 100. Fan baffle; 110. Outer ring plate; 120. Transition section; 130. Inner ring plate; 131. Center portion; 132. Edge portion; 133. Lifting portion; 140. Return air inlet; 150. Auxiliary return air inlet; 160. Air outlet; 170. Outer edge section; 180. Cover; 190. Connecting column; 200. Impeller; 210. Trailing edge cover; 220. Fan blade. 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] A cooking device includes 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 includes a cooking cavity, and the hot air system includes a warm air cavity. The fan assembly 10 is installed between the hot air system and the inner container and is used to exchange air between the cooking cavity and the warm air cavity, thereby forming a warm air circulation between the cooking cavity and the warm air cavity. Optionally, 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 includes a heater (not shown) located on the side of the impeller 200 facing away from the fan baffle 100. The heater is configured to heat the airflow to form hot air. In this embodiment, an electric heating tube is used for heating.

[0032] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a fan baffle 100, which includes an outer ring plate 110, a transition section 120 and an inner ring plate 130 connected in sequence, and an impeller 200 includes a plurality of blades 220, which can be rotatably arranged relative to the fan baffle 100 and are located on the side of the outer ring plate 110 facing the inner ring plate 130.

[0033] like Figure 1 As shown, the inner ring plate 130 is provided with a return air port 140 which passes through the inner ring plate 130 in the thickness direction of the fan baffle 100, which is used for the air flow to return to the side where the impeller 200 is located after circulation, and for the gas in the cooking cavity of the inner pot in the cooking equipment to flow to the warm air cavity of the hot air system.

[0034] like Figure 1 As shown, the fan baffle 100 is further provided with an air outlet 160 located on and penetrating the outer ring plate 110, for air to flow from one side where the impeller 200 is located to the other side, and for 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 160 is arranged at the corner of the outer ring 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 160 is high, thereby improving the gas flow efficiency.

[0035] The outer ring plate 110 and the inner ring plate 130 have a height difference in the thickness direction of the fan baffle 100, and the transition section 120 is inclined downwardly toward the inner ring plate 130. That is, the inner ring plate 130, where the return air outlet 140 is located, adopts a concave structure. This uses the inclined transition section 120 to guide the hot air return, reduce the return air resistance, and direct the hot air return airflow toward the negative pressure zone at the center of the fan blade 220, thereby enhancing the stability of the hot air flow. The plane where the outer ring plate 110 is located is separated from the plane where the inner ring plate 130, where the return air outlet 140 is located, so that the plane where the return air outlet 140 is located is spatially lower than the plane where the outer ring plate 110 is located. This optimizes the traditional front return air flow into a sunken annular return air flow, solving the problem of reverse airflow overflow at the edge of the return air outlet 140. This reduces the mutual influence between the return air and the outlet air in the hot air system of the cooking equipment and enhances the stability of the hot air system.

[0036] In one embodiment, the inner ring plate 130 is a circular structure and the transition section 120 is an annular structure arranged around the inner ring plate 130, so that the hot air return air can evenly enter the return air outlet 140 through the guiding effect of the transition section 120, thereby improving the stability and uniformity of the hot air flow.

[0037] In one embodiment, the return air vent 140 is coaxially arranged with the inner ring plate 130. Specifically, in this embodiment, there is only one return air vent 140, located at the center of the fan baffle 100. The diameter of the return air vent 140 is no less than half the diameter of the inner ring plate 130. For example, the diameter of the return air vent 140 ranges from 30 mm to 70 mm. Preferably, the diameter of the return air vent 140 is no less than 0.8 times the diameter of the inner ring plate 130. Compared to the arrayed return air vents 140 used in the prior art, the arrayed return air vents 140 have partitions between adjacent return air vents 140, and their total open area is smaller than that of the return air vents 140 in this application. This reduces the overall loss of circulating air volume caused by reverse overflow of airflow at the edges of the arrayed return air vents 140, improves the temperature uniformity of the hot air system, and ensures both baking time and baking uniformity in the cooking apparatus.

[0038] like Figure 1 and Figure 2 In the fan assembly 10 shown, for example, the impeller 200 is a semi-open impeller 200, which 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 one side of the fan baffle 100, and the trailing edge cover plate 210 is coaxially arranged with the return air outlet 140.

[0039] In order to ensure that the inner plate 130 acts on the negative pressure area at the center core of the blade 220, and the transition section 120 between the outer plate 110 and the inner plate 130 can also directly act on the negative pressure area at the center core of the blade 220, while taking into account the area of ​​the return air channel, in some embodiments, the diameter of the impeller 200 is D1, and the inner diameter D2 of the outer plate 110 is The outer diameter D3 of the inner ring plate 130 is Conventionally, the diameter of the impeller 200 used in cooking equipment is mostly 150 mm. Taking the diameter of the impeller 200 as D1 = 150 mm as an example, the inner diameter D2 of the outer ring plate 110 is 100 mm-180 mm, and the outer diameter D3 of the inner ring plate 130 is 50 mm-100 mm.

[0040] In such Figure 1 and Figure 2 In the illustrated embodiment, the fan baffle 100 further includes a cover 180, which is connected to the inner ring plate 130 and aligned with and covers the return air inlet 140. Cover 180 covering the return air inlet 140 means that the cover 180 can block the return air inlet 140 when viewing the fan baffle 100 from the side provided with the cover 180, or that the cover 180 can completely fill the return air inlet 140 when viewing the fan baffle 100 from the side facing away from the cover 180. In some embodiments, the diameter of the cover 180 is greater than the outer diameter of the inner ring plate 130, and is between 1.1D3 and 1.2D3.

[0041] like Figure 2 As shown, a gap exists between the cover 180 and the fan baffle 100 in the axial direction of the return air inlet 140, forming a return air channel connected to the return air inlet 140, allowing the return air to enter the return air inlet 140 through the return air channel. Due to the hot air circulation, the oil and dirt generated by the food during the hot air steaming and baking process is carried by the return air. During the flow of the return air, the oil and dirt entrained by the return air mainly adhere to the flat surfaces of the outer ring plate 110 and the cover 180, which can be directly cleaned within the cooking cavity of the inner pot, thereby improving the cleanability of the fan baffle 100.

[0042] See Figure 3 , Figure 3 FIG. 1 shows an exploded structural diagram of a fan assembly 10 in another embodiment of the present application. Figure 4 Shown Figure 3 A schematic structural diagram of the blower baffle 100, Figure 5 Shown Figure 4 Schematic diagram of the cross-sectional structure of the fan baffle 100. Figure 1 and Figure 2The difference between the embodiment shown is that the inner ring plate 130 includes a central portion 131 and an edge portion 132 located on the same plane. The edge portion 132 is located on the periphery of the central portion 131 and is provided with a plurality of return air ports 140 for returning the air flow to the side where the impeller 200 is located after the air circulation. In the cooking device, the air in the cooking cavity of the inner pot flows to the warm air cavity of the hot air system. Figure 4 As shown, all return air vents 140 are distributed along the circumference of the inner ring plate 130, and the apertures of the return air vents 140 gradually decrease from the edge to the inside along the radial direction of the inner ring plate 130. From the edge to the inside, they gradually approach the core negative pressure area of ​​the fan blade 220, and the apertures of the return air vents decrease from the outside to the inside, which can effectively maintain smooth return air flow, reduce return air resistance, and increase circulating air volume.

[0043] In one embodiment, the transition section 120 is provided with a plurality of auxiliary return air vents 150. When the fan assembly 10 is in operation, the fan blades 220 rotate clockwise in a single direction. The auxiliary return air vents 150 are in an arc-shaped structure and are spirally arranged in the same direction and spaced apart to form a circular ring structure. The arc-shaped holes are designed as leaf veins in a clockwise direction along the air inlet direction according to the direction of rotation of the air flow.

[0044] Theoretically, the greater the height difference between the inner ring plate 130 and the outer ring plate 110, that is, the greater the depth of the inner ring plate 130 that is recessed relative to the inner ring plate 130, the better the gathering effect of the return air. However, the maximum sinking depth of the inner ring plate 130 must not affect the safe operation of the fan blades 220. In this embodiment, the minimum distance between the inner ring plate 130 and the fan blades 220 is 3 mm. Since the return air inlet 140 is directly provided on the inner ring plate 130 and the auxiliary return air inlet 150 is provided on the transition section 120, the return air directly enters the blade tip or the core negative pressure area of ​​the impeller 200. In order to reduce the mutual influence of the two return air streams from the return air inlet 140 and the auxiliary return air inlet 150, different return air channels are constructed in space. Figures 3 to 6 As shown, in one embodiment, the inner ring plate 130 further includes a lifting portion 133, which is located on the outer periphery of the edge portion 132 and connected to the transition section 120, as shown in FIG. Figure 5 As shown, the lifting portion 133 is inclined toward the edge portion 132 with an upward slope, and the height difference of the edge portion 132 in the thickness direction of the fan baffle 100 is smaller than the height difference of the transition section 120 in the thickness direction of the fan baffle 100. In this specification, unless otherwise specified, the height difference hereinafter refers to the height difference in the thickness direction of the fan baffle 100, so as to lift the inner ring plate 130 away from the fan blades 220, so as to reduce the mutual influence of the two return air from the return air outlet 140 and the auxiliary return air outlet 150, and construct different return air channels in space.

[0045] like Figure 5As shown, in one embodiment, the height difference of the transition section 120 is H, and the height difference of the raised portion 133 is h, where h is 0.35H-0.7H. For example, the height difference of the transition section 120 is H=6mm, i.e., the maximum sinking depth of the inner ring plate 130 is 6mm, and the height difference of the raised portion 133 is h=2.1mm-4.2mm.

[0046] like Figure 6 As shown, the transition section 120 is located opposite the blade tip of the fan blade 220. The return air inclination angle set at the transition section 120 can effectively suppress the overflow of the return air flow. In one embodiment, the inclination angle α of the transition section 120 relative to the inner ring plate 130 is 7°-15°, which can achieve the best diversion effect while taking into account the requirements of the manufacturing process. Although an excessively large inclination angle α will enhance the diversion of the hot return air, it will cause the bottom of the transition section 120 to be too close to the fan blade 220, resulting in an increase in air pressure between the two, insufficient air flow space, increased flow resistance, and an increased burden on the fan assembly 10, thereby affecting the safe operation of the hot air blower. If the inclination angle is too small, the hot return air diversion effect will be reduced.

[0047] like Figure 3 and Figure 4 In the illustrated embodiment, strip-shaped holes are designed at the upper left, lower left, upper right, and lower right of the outer ring plate 110. Air outlet 160 utilizes a four-sided strip-shaped hole design, which increases the air outlet area compared to traditional short strip-shaped or circular holes. The upper left portion serves as the primary air outlet 160, and to improve airflow uniformity, additional circular holes are added to supplement the airflow. This airflow solution ensures stable outlet airflow, ensuring a good match with return airflow, resulting in more uniform hot air discharge and improved baking uniformity.

[0048] The fan baffle 100 provided in the above scheme separates the plane where the outer ring plate 110 is located from the plane where the inner ring plate 130 with the return air outlet 140 is located by setting a height difference between the outer ring plate 110 and the inner ring plate 130 and tilting the transition plate between the two with a downward slope. In terms of space, the plane where the return air outlet 140 is located is lower than the plane where the outer ring plate 110 is located, and the traditional front return air is optimized into a sunken annular return air, solving the problem of reverse overflow of the edge airflow of the return air outlet 140, thereby reducing the mutual influence between the return air and the outlet air in the hot air system of the cooking equipment and enhancing the stability of the hot air system.

[0049] 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.

[0050] 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 includes an outer ring plate, a transition section and an inner ring plate connected in sequence. A return air outlet is provided on the inner ring plate along the thickness direction of the fan baffle. There is a height difference between the outer ring plate and the inner ring plate in the thickness direction of the fan baffle, and the transition section is inclined at a downward slope toward the inner ring plate.

2. The fan baffle according to claim 1, characterized in that: The inner ring plate is a circular structure and the transition section is an annular structure arranged around the inner ring plate.

3. The fan baffle according to claim 1, characterized in that: There is one return air port, which is coaxially arranged with the inner ring plate, and a diameter of the return air port is not less than half of a diameter of the inner ring plate.

4. The fan baffle according to claim 1, characterized in that: The inner ring plate includes a central portion and an edge portion located in the same plane. The edge portion is located on the periphery of the central portion and is provided with a plurality of return air ports. All of the return air ports are distributed along the circumference of the inner ring plate. The apertures of the return air ports gradually decrease from the edge to the inside along the radial direction of the inner ring plate.

5. The fan baffle according to claim 4, characterized in that: The transition section is provided with a plurality of auxiliary return air vents, which are arc-shaped and spirally arranged in the same direction and spaced apart to form a circular ring structure.

6. The fan baffle according to claim 5, characterized in that: The inner ring plate further includes a lifting portion, which is located at the outer periphery of the edge portion and connected to the transition section. The lifting portion is inclined toward the edge portion with an upward slope, and a height difference of the edge portion in the thickness direction of the fan baffle is smaller than a height difference of the transition section in the thickness direction of the fan baffle.

7. The fan baffle according to claim 6, characterized in that: The height difference of the transition section in the thickness direction of the fan baffle is H, and the height difference of the lifting portion in the thickness direction of the fan baffle is h, and the range of h is 0.35H-0.7H.

8. The fan baffle according to claim 6, characterized in that: The inclination angle of the transition section relative to the inner ring plate is 7°-15°.

9. A fan assembly, characterized in that: The impeller comprises an impeller and a fan baffle according to any one of claims 1 to 8, wherein the impeller comprises a plurality of blades, the blades being rotatably arranged relative to the fan baffle and being located on a side of the outer ring plate facing the inner ring plate, the diameter of the impeller being D1, the inner diameter of the outer ring plate being D2, and the range of D2 being The outer diameter of the inner ring plate is D3, and the range of D3 is 10. A cooking device, characterized in that: The invention comprises the fan assembly described in claim 9.

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