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 inner air return opening penetrating through the inner ring plate in the thickness direction of the draught fan baffle, the outer ring plate and the inner ring plate have height difference in the thickness direction of the draught fan baffle, the transition section is obliquely arranged towards the inner ring plate by downward gradient, and the transition section is provided with an outer air return opening. According to the scheme, the fan baffle, the outer return air inlet and the inner return air inlet jointly form a double-layer return air structure, on one hand, the problems that a traditional hot air outlet is short-strip-shaped, round holes are scattered in the front face of the baffle, and the air outlet area is small are solved, on the other hand, the flow guiding effect is achieved, overflow of return hot air is effectively reduced, and the service life of the fan is prolonged. Therefore, 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 an inner return air outlet is provided on the inner ring plate through 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, and the transition section is provided with an outer return air outlet.

[0006] In one embodiment, adjacent outer return air vents are spaced apart and all the outer return air vents are arranged in a circular ring structure arranged around the inner ring plate.

[0007] 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.

[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 outer periphery of the central portion and the edge portion is provided with a plurality of the inner return air outlets, all of the inner return air outlets are distributed along the circumference of the inner ring plate, and the aperture of the inner return air outlets gradually decreases from the edge to the inside along the radial direction of the inner ring plate.

[0009] In one embodiment, the fan baffle further includes a lifting section, which is connected to the outer periphery of the inner ring plate and to the transition section. The lifting section is inclined toward the inner ring plate 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.

[0010] 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 edge portion in the thickness direction of the fan baffle is h, and h is 0.35H-0.7H.

[0011] In one embodiment, the outer return air outlet is in an arc-shaped structure and spirals in the same direction.

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

[0013] In one embodiment, an air outlet is provided at each corner of the outer ring plate, and the air outlet at at least one of the corners includes a strip hole and a circular hole.

[0014] A fan assembly includes an impeller and a fan baffle as described in any of the above embodiments, wherein the impeller includes a plurality of blades, which are rotatably arranged relative to the fan baffle and are located on the side of the outer ring plate facing the inner ring plate.

[0015] In one embodiment, the diameter of the impeller is D1, the inner diameter of the outer ring plate is D2, and the range of D2 is The outer diameter of the inner ring plate is D3, and the range of D3 is

[0016] A cooking device comprises the fan assembly described in any one of the above embodiments.

[0017] The fan baffle provided in the above scheme is configured to have a height difference between the outer ring plate and the inner ring plate, and to tilt the transition plate between the two at a downward slope, and to set an inner return air outlet on the inner ring plate, and to set an outer return air outlet surrounding the inner return air outlet in the transition section, so that the outer return air outlet and the inner return air outlet together form a double-layer return air structure. On the one hand, it solves the problem that the traditional hot air outlet is short strip-shaped, the circular holes are scattered on the front of the baffle and the air outlet area is small. On the other hand, it plays a guiding role, effectively reducing the overflow of hot air return air, thereby enhancing the stability of the hot air system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the explosion 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 3 Schematic diagram of the cross-sectional structure of the medium-pressure blower baffle.

[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; 140. Inner return air outlet; 150. Outer return air outlet; 160. Air outlet; 170. Outer edge section; 180. Lifting section; 200. Impeller; 210. Trailing edge cover; 220. Fan blades. 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 2A 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 Figures 1 to 4 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. Figure 1 and Figure 2 As shown, the impeller 200 includes a plurality of blades 220 . The blades 220 are rotatably arranged relative to the fan baffle 100 and are located on a 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 an inner 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 and Figure 3 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 set at the corner of the outer ring plate 110. During the operation of the impeller 200, the air flow flows radially toward the periphery of 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. Figure 1 and Figure 3 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 outlets 160 are designed with strip-shaped holes all around, increasing the airflow area compared to traditional short strip-shaped or circular holes. Air outlets 160 at at least one corner include both strip-shaped and circular holes. In this embodiment, the upper left serves as the primary air outlet 160. To improve airflow uniformity, additional circular holes are added as supplementary holes. This airflow arrangement ensures a stable outlet airflow, ensuring a good match with the return airflow, resulting in a more uniform hot air flow and improved baking uniformity.

[0035] In order to ensure that the inner plate 130 is located at the center core negative pressure area of ​​the fan blade 220, and the transition section 120 located between the outer plate 110 and the inner plate 130 can also directly act on the center core negative pressure area of ​​the fan blade 220, while taking into account the area of ​​the return air channel, such as Figure 2 As shown, in some embodiments, the diameter of the impeller 200 is D1, and the inner diameter D2 of the outer ring 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.

[0036] like Figure 4 As shown, 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 inner return air outlet 140 is located, adopts a concave structure. The inclined transition section 120 guides the hot air return air, reduces the return air resistance, and directs 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 inner return air outlet 140 is located, so that the plane where the inner 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. 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.

[0037] like Figure 1 and Figure 3 As shown, the transition section 120 is provided with an external return air outlet 150, and adjacent external return air outlets 150 are arranged at intervals and all external return air outlets 150 are arranged into a circular ring structure arranged around the inner ring plate 130. The external return air outlet 150 and the internal return air outlet 140 together form a double-layer return air structure. On the one hand, it solves the problem that the traditional hot air outlet is short strip-shaped, the circular holes are scattered on the front of the baffle and the air outlet area is small. On the other hand, it plays a guiding role, effectively reducing the overflow of hot air return air, thereby enhancing the stability of the hot air system.

[0038] The fan assembly 10 in the existing cooking equipment is usually Figure 1The open impeller 200 shown is divided into two parts: the fan blades 220 and the trailing edge cover plate 210. In the existing hot air blower baffle 100 design, the return air port adopts a front array return air port. During the hot air circulation, the hot return air enters the return air chamber from the front. Due to the influence of airflow inertia, the hot return air will flow out from the unsealed part of the trailing edge cover plate 210, resulting in poor stability of the hot return air. In this embodiment, the outer return air port 150 and the inner return air port 140 together form a double-layer return air structure. The return air passing through the outer return air port 150 enters the return air chamber through a sunken structure. The outer return air port 150 plays a guiding role, effectively reducing the overflow of the hot return air, thereby enhancing the stability of the hot air system.

[0039] 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 through the guiding effect of the transition section 120, forming a sunken annular return air hood in space, which plays a guiding role for the hot air return, thereby improving the stability and uniformity of the hot air flow.

[0040] Theoretically, the greater the height difference between inner ring plate 130 and outer ring plate 110, that is, the deeper the inner ring plate 130 is sunken relative to the inner ring plate 110, the better the return air concentration effect. However, the maximum sinking depth of inner ring plate 130 must not affect the safe operation of blades 220. In this embodiment, the minimum distance between inner ring plate 130 and blades 220 is 3 mm. Because inner return air inlet 140 is directly provided on inner ring plate 130 and outer return air inlet 150 is provided on transition section 120, the return air directly enters the blade tips or core negative pressure zone of impeller 200. To reduce the mutual influence of the two return air streams from inner return air inlet 140 and outer return air inlet 150, different return air channels are constructed in space. In one embodiment, the fan baffle 100 also includes a lifting section 180, which is connected to the outer periphery of the inner ring plate 130 and connected to the transition section 120. The lifting section 180 is inclined toward the inner ring plate 130 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, thereby reducing the mutual influence of the two return air from the inner return air outlet 140 and the outer return air outlet 150, and constructing different return air channels in space.

[0041] It is understood that if the height difference between the transition section 120 and the edge portion 132 is too large, the edge portion 132's ability to lift the inner ring plate 130 away from the blades 220 to create spatially distinct return air channels will be reduced. This means that the effects of the two return air streams from the inner return air inlet 140 and the outer return air inlet 150 cannot be completely eliminated. Furthermore, if the height difference between the transition section 120 and the edge portion 132 is too small, the inner ring plate 130 will be lifted too high away from the blades 220, resulting in air return difficulties. In one embodiment, the height difference between the transition section 120 is H, and the height difference between the edge portion 132 is h, with h ranging from 0.35H to 0.7H. For example, the height difference between the transition section 120 is H = 6 mm, meaning the maximum sinking depth of the inner ring plate 130 is 6 mm, and the height difference of the lifting portion is h = 2.1 mm to 4.2 mm.

[0042] In one embodiment, 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 inner 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 gas in the cooking cavity of the inner pot flows to the warm air cavity of the hot air system. Figure 2 As shown, all inner return air ports 140 are distributed along the circumference of the inner ring plate 130, and the apertures of the inner return air ports 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 ports 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 external return air outlet 150 has an arc-shaped structure. When the fan assembly 10 is running, the fan blades 220 rotate clockwise in a single direction and spiral in the same direction. The arc-shaped holes are designed as leaf veins according to the direction of air flow rotation, and are arranged clockwise along the air inlet direction. The return air enters the return air chamber through the sunken structure, which plays a guiding role, effectively reducing the overflow of hot air return air, thereby enhancing the stability of the hot air system.

[0044] Transition section 120 is positioned opposite the blade tip of fan blade 220. The return air inclination angle set at transition section 120 can effectively suppress the overflow of return air. In one embodiment, the inclination angle of transition section 120 relative to outer ring plate 110 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 hot return air, it will cause the bottom of transition section 120 to be too close to fan blade 220, resulting in increased air pressure between the two, insufficient air flow space, increased flow resistance, and increased burden on 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.

[0045] The fan baffle 100 provided in the above scheme is achieved by setting a height difference between the outer ring plate 110 and the inner ring plate 130, and tilting the transition plate located between the two at a downward slope, and setting an inner return air outlet 140 on the inner ring plate 130, and setting an outer return air outlet 150 surrounding the inner return air outlet 140 in the transition section 120, so that the outer return air outlet 150 and the inner return air outlet 140 together form a double-layer return air structure. On the one hand, it solves the problem that the traditional hot air outlet 160 is short strip-shaped, the circular holes are scattered on the front of the baffle and the air outlet area is small. On the other hand, it plays a guiding role, effectively reducing the overflow of hot air return air, thereby enhancing the stability of the hot air system.

[0046] 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.

[0047] 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, an inner 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, and the transition section is provided with an outer return air outlet.

2. The fan baffle according to claim 1, characterized in that: Adjacent outer return air vents are spaced apart and all of the outer return air vents are arranged in a circular ring structure surrounding the inner ring plate.

3. 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.

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 outer periphery of the central portion and is provided with a plurality of inner return air ports, all of the inner return air ports are distributed along the circumference of the inner ring plate, and the apertures of the inner 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 fan baffle further includes a lifting section, which is connected to the outer periphery of the inner ring plate and connected to the transition section. The lifting section is inclined toward the inner ring plate 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.

6. The fan baffle according to claim 5, 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 edge portion in the thickness direction of the fan baffle is h, where h is 0.35H-0.7H.

7. The fan baffle according to claim 1, characterized in that: The outer return air outlet has an arc-shaped structure and spirals in the same direction.

8. The fan baffle according to claim 1, characterized in that: The inclination angle of the transition section relative to the outer ring plate is 7°-15°.

9. The fan baffle according to claim 1, characterized in that: An air outlet is provided at each corner of the outer ring plate, and the air outlet at at least one of the corners includes a strip hole and a circular hole.

10. A fan assembly, characterized in that: The fan baffle comprises an impeller and the fan baffle according to any one of claims 1 to 9, wherein the impeller comprises a plurality of blades, the blades are rotatably arranged relative to the fan baffle and are located on a side of the outer ring plate facing the inner ring plate.

11. The fan assembly according to claim 10, characterized in that: The diameter of the impeller is D1, the inner diameter of the outer ring plate is D2, and the range of D2 is The outer diameter of the inner ring plate is D3, and the range of D3 is 12. A cooking device, characterized in that: The invention comprises the fan assembly described in any one of claims 10-11.

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