Wind wheel for oven

Abstract

The utility model relates to the technical field of oven structures, in particular to a wind wheel for an oven, which comprises an air return plate, blades and an air guide structure playing an air guide role, a plurality of groups of blades are uniformly arranged around the end face of the air return plate, an air inlet is formed among the plurality of groups of blades, an air outlet is formed between every two adjacent blades, and the air guide structure is arranged on the air return plate. The air guide structure is arranged on or connected with the blades, and / or the air guide structure is arranged on or connected with the air return plate. Vortex generated in the rotating process of the wind wheel is reduced, it is guaranteed that the air outlet amount of all the positions of the wind wheel is stable, and the baking effect of all the positions in the oven is uniform.

Description

Technical Field

[0001] This utility model relates to the technical field of oven structure, and more specifically, to an oven impeller. Background Technology

[0002] As living standards improve, ovens have become an indispensable part of modern family kitchens, with baked goods such as egg tarts, French fries, and roast chicken being widely enjoyed. Ovens use high-temperature air circulation to bake food, achieving a crispy texture without the need for frying, thus meeting the requirements of healthy eating. Current technology typically incorporates a fan mechanism inside the oven to achieve efficient high-temperature air circulation. Driven by a motor, the fan forces airflow to exchange heat with the heating elements before returning to the cavity. However, existing technology lacks an airflow guiding structure, making it prone to turbulence or localized vortices during high-speed rotation, resulting in uneven heat distribution and affecting baking quality. Utility Model Content

[0003] The purpose of this invention is to overcome the lack of airflow guiding structure in the existing technology, where high-temperature airflow is prone to turbulence or local vortices during high-speed rotation, resulting in uneven heat distribution. This invention provides an oven impeller that reduces vortices during rotation, ensures stable airflow at each position of the impeller, and achieves uniform baking effect in all positions inside the oven.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An oven impeller is provided, comprising a return air plate, blades, and an air guiding structure for guiding air. Multiple sets of blades are evenly arranged around the end face of the return air plate, and an air inlet is formed between the multiple sets of blades. An air outlet is formed between adjacent blades. The air guiding structure is disposed on or connected to the blades, and / or the air guiding structure is disposed on or connected to the return air plate.

[0006] The impeller of this invention has blades spaced around the axis of the return air plate. During the rotation of the impeller, air is drawn into the impeller from the air inlet and then flows out from the air outlet formed between adjacent blades. During the airflow movement, it passes through the air guide structure and forms a stable airflow under the guidance of the air guide structure, reducing the eddies generated during the rotation of the impeller. This ensures that the air volume at each position of the impeller is stable, and achieves uniform baking effect in each position inside the oven. It can complete the uniform baking of multiple layers of food in the oven.

[0007] Furthermore, the air guiding structure is an air guiding ring connected to the top of the blades, and the axis of the air guiding ring coincides with the axis of the return air plate. The air guiding ring can guide the disordered radial airflow. During high-speed rotation, through the guiding effect of the air guiding ring, hot air flows out more evenly from all directions in the impeller, thereby uniformly covering the oven cavity and reducing local high or low temperature areas.

[0008] Furthermore, the air guide ring includes a first arc portion, a circular ring portion, and a second arc portion arranged from top to bottom. The diameter of the outer edge of the second arc portion is equal to the diameter of the return air plate, and the diameter of the outer edge of the first arc portion is smaller than the diameter of the return air plate. The second arc portion is connected to the top of the blade, and its diameter is controlled to be the same as that of the return air plate to avoid affecting the normal flow of airflow from the air outlet. The circular ring portion guides the passing airflow to keep the airflow volume consistent in all directions. The outer edge diameter of the first arc portion is smaller than the diameter of the return air plate to prevent the airflow from entering the air guide ring due to the first arc portion being too large, ensuring that the circular ring portion can fully exert its guiding function.

[0009] Furthermore, the air guiding structure is an air guide trough disposed between the blades and the return air plate. The air guide trough can guide the disordered airflow generated by the high-speed rotation of the impeller, adjust the airflow on the return air plate into tangential airflow, eliminate the phenomenon of local airflow concentration, and improve the uniformity of hot air circulation.

[0010] Furthermore, the air guide slot includes an annular groove on the end face of the return air plate and a recessed hole on the bottom of the blade, wherein the axis of the annular groove coincides with the axis of the return air plate. The recessed hole and the annular groove cooperate to increase the cross-sectional area of ​​the airflow channel, allowing the airflow in the impeller to flow smoothly along the air guide slot, fully utilizing the air guide slot's guiding effect, and reducing the eddies generated during the impeller's rotation.

[0011] Furthermore, the blade includes a vertically arranged first connecting portion and an air guide portion. The first connecting portion is connected to the return air plate, and the air guide structure is a guide rib provided on the air guide portion. The first connecting portion can increase the contact area between the blade and the return air plate, improve the fixing effect of the blade on the return air plate, ensure that the blade remains stable during rotation, avoid vibration, and enhance the stability of the air outlet. The guide rib can not only improve the blade strength, but also guide the airflow direction by changing the airflow path on the surface of the air guide portion. The specific angle of the guide rib can force the airflow to flow in a predetermined direction, enhance the uniformity of hot air coverage in the oven cavity, and reduce the difference between cold and hot areas.

[0012] Furthermore, the blade includes a first blade and a second blade stacked together, and the guide rib is disposed on the first blade or the second blade. Using a stacked first blade and a second blade together to form the blade can significantly improve the bending stiffness of the blade, prevent blade twisting or breakage due to centrifugal force or thermal expansion during high-speed rotation, and improve the operational stability of the wind turbine.

[0013] Furthermore, the air guiding structure consists of air cutters located on the other end face of the return air plate, with the air cutters arranged radially and evenly around the axis of the return air plate. Multiple sets of air cutters are vertically arranged on the back of the return air plate. When the impeller rotates at high speed, the air cutters are arranged radially, aligned with the direction of centrifugal force, using centrifugal force to throw air outwards while simultaneously cutting and separating the high-speed rotating airflow to form a low-pressure zone. This pressure difference draws in external air, maintaining a continuous suction effect.

[0014] Furthermore, the air cutter includes a vertically arranged fixing part and an air cutting part, with the fixing part connected to the return air plate. The mutually perpendicular fixing part and air cutting part form an L-shaped structure, which facilitates the installation of the air cutter on the end face of the return air plate and increases the connection stability between the air cutter and the return air plate.

[0015] Furthermore, the return air plate has a countersunk hole at its center, and the countersunk hole has a through hole at its center. The through hole at the center of the return air plate is used to connect the rotating shaft of the drive assembly, and the countersunk hole around the through hole provides an installation position for parts such as bushings, facilitating the assembly of the impeller.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Reduced eddies during rotation ensured stable airflow at all positions of the impeller, resulting in uniform baking performance throughout the oven.

[0018] 2. It achieves back air intake, drawing in cold air for air pressure compensation, increasing the air pressure during the hot air circulation process;

[0019] 3. The oven has high hot air circulation efficiency, which can bake multiple layers of food at the same time, shortening the baking time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the wind turbine structure;

[0021] Figure 2 This is a bottom view of the wind turbine;

[0022] Figure 3 This is the front view of the wind turbine;

[0023] Figure 4 This is a schematic diagram of the blade structure.

[0024] In the attached diagram: 100, return air plate; 110, countersunk hole; 120, through hole; 200, blade; 210, first blade; 220, second blade; 230, first connecting part; 240, air guide part; 241, air guide rib; 250, second connecting part; 300, air inlet; 400, air outlet; 500, air guide ring; 510, first arc part; 520, annular part; 530, second arc part; 600, air guide groove; 610, annular groove; 620, concave hole; 700, air cutter; 710, fixing part; 720, air cutter; 800, rotating shaft. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Example 1

[0028] This embodiment is a first embodiment of an oven impeller, including a return air plate 100, blades 200, and an air guiding structure that serves to guide air. Multiple sets of blades 200 are evenly arranged around the end face of the return air plate 100, and the multiple sets of blades 200 form an air inlet 300, and adjacent blades 200 form an air outlet 400. The air guiding structure is provided on or connected to the blades 200, and / or the air guiding structure is provided on or connected to the return air plate 100.

[0029] Specifically, in this embodiment, the air guiding structure can be disposed on the blade 200, or connected to the top or bottom end of the blade 200; it can be disposed on the return air plate 100, or connected to the return air plate 100. When there is only one type of air guiding structure, one of the above-mentioned positional or connection relationships is selected; when there are two or more air guiding structures, a combination of two or more of the above-mentioned positional or connection relationships is selected. It should be noted that all air guiding structures capable of performing air guiding functions are within the protection scope of this utility model.

[0030] In this embodiment, the impeller blades 200 are spaced apart around the axis of the return air plate 100. During the rotation of the impeller, air is drawn into the impeller from the air inlet 300, impacts the return air plate 100 vertically, and then flows out from the air outlet 400 formed between adjacent blades 200. During the airflow movement, it passes through the air guide structure and forms a stable airflow under the guidance of the air guide structure, reducing the eddies generated during the rotation of the impeller. This ensures that the air volume at each position of the impeller is stable, and achieves uniform baking effect in each position inside the oven. It can complete the uniform baking of multiple layers of food in the oven.

[0031] In this embodiment, the air guiding structure is an air guiding ring 500 connected to the top of the blade 200, and the axis of the air guiding ring 500 coincides with the axis of the return air plate 100. The air guiding ring 500 can guide the disordered radial airflow. During high-speed rotation, through the guiding effect of the air guiding ring 500, hot air flows out more evenly from all directions in the impeller, thereby uniformly covering the oven cavity and reducing local high or low temperature areas.

[0032] The air guide ring 500 includes a first arc portion 510, an annular portion 520, and a second arc portion 530 arranged from top to bottom. The diameter of the outer edge of the second arc portion 530 is equal to the diameter of the return air plate 100, while the diameter of the outer edge of the first arc portion 510 is smaller than the diameter of the return air plate 100. The second arc portion 530 is connected to the top of the blade 200, and its diameter is controlled to be the same as that of the return air plate 100 to avoid affecting the normal flow of airflow from the air outlet 400. The annular portion 520 guides the passing airflow to keep the airflow volume consistent in all directions. The outer edge diameter of the first arc portion 510 is smaller than the diameter of the return air plate 100 to prevent the airflow from entering the air guide ring 500 due to the large diameter of the first arc portion 510, thus ensuring that the annular portion 520 can fully exert its guiding function.

[0033] like Figure 1 , Figure 3 As shown, in this embodiment, the return air plate 100 is also provided with a countersunk hole 110 at its center, and a through hole 120 is provided at the center of the countersunk hole 110. The through hole 120 at the center of the return air plate 100 is used to connect the rotating shaft 800 of the drive assembly. At the same time, the countersunk hole 110 is provided around the through hole 120 to provide an installation position for parts such as bushings, which facilitates the assembly of the impeller.

[0034] Example 2

[0035] This embodiment is a second embodiment of an oven impeller. This embodiment is similar to the first embodiment, except that in this embodiment, the air guiding structure is an air guide trough 600 located between the blades 200 and the return air plate 100. The air guide trough 600 can guide the disordered airflow generated by the high-speed rotation of the impeller, adjust the airflow on the return air plate 100 into tangential airflow, eliminate localized airflow concentration, and improve the uniformity of hot air circulation.

[0036] like Figure 1 , Figure 3 As shown, the air guide 600 includes an annular groove 610 on the end face of the return air plate 100 and a recessed hole 620 on the bottom of the blade 200. The axis of the annular groove 610 coincides with the axis of the return air plate 100. The recessed hole 620 cooperates with the annular groove 610 to increase the cross-sectional area of ​​the airflow channel, allowing the airflow in the impeller to flow smoothly along the air guide 600, fully utilizing the air guide effect of the air guide 600, and reducing the eddies generated during the rotation of the impeller. The annular groove 610 is located on the end face of the return air plate 100, making it easy to obtain directly through stamping. The shape of the recessed hole 620 at the bottom of the blade 200 can be square, trapezoidal, arc-shaped, etc., so as to form airflow channels with different cross-sectional shapes in cooperation with the annular groove 610. In this embodiment, the shape of the recessed hole 620 is square, which reduces the difficulty of machining while ensuring the airflow guiding effect.

[0037] Example 3

[0038] This embodiment is the third embodiment of the oven impeller. This embodiment is similar to the first embodiment, except that the air guiding structure in this embodiment is a guide rib 241 provided on the blade 200.

[0039] Specifically, the blade 200 includes a vertically arranged first connecting portion 230 and an air guide portion 240. The first connecting portion 230 is connected to the return air plate 100, and the air guide structure is a guide rib 241 provided in the air guide portion 240. Figure 4 As shown, the first connecting portion 230 increases the contact area between the blade 200 and the return air plate 100, improving the fixation effect of the blade 200 on the return air plate 100, ensuring that the blade 200 remains stable during rotation, avoiding vibration, and enhancing airflow stability. The guide rib 241 not only improves the strength of the blade 200 but also guides the airflow direction by changing the airflow path on the surface of the guide portion 240. The specific angle of the guide rib 241 forces the airflow to flow in a predetermined direction, enhancing the uniformity of hot air coverage within the oven cavity and reducing differences between cold and hot zones. Figure 4As shown, the blade 200 in this embodiment also includes a second connecting part 250. The second connecting part 250 is disposed on the top of the air guide part 240 and perpendicular to the air guide part 240. The second connecting part 250 is used to connect the blade 200 and the air guide ring 500, which can increase the contact area between the blade 200 and the air guide ring 500, changing the contact from line contact to surface contact, which can increase the stability of the impeller during operation and improve the uniformity of air output.

[0040] like Figure 4 As shown, the blade 200 includes a first blade 210 and a second blade 220 stacked together, with a guide rib 241 disposed on either the first blade 210 or the second blade 220. The stacked first blade 210 and second blade 220 together form the blade 200, which significantly improves the bending stiffness of the blade 200, preventing twisting or breakage of the blade 200 due to centrifugal force or thermal expansion during high-speed rotation, and improving the operational stability of the wind turbine. The first blade 210 and the second blade 220 can be configured with the same structure, both including a first connecting part 230, a guide part 240, and a second connecting part 250, increasing the strength of the blade 200 through the stacked structure. In this embodiment, the first blade 210 and the second blade 220 are similar in shape but not the same. The area of ​​the first blade 210 is slightly larger than that of the second blade 220. Both blades are approximately trapezoidal in shape, so that the guide ribs 241 are all located inside the second blade 220. The first blade 210 and the second blade 220 are fixed together by welding. At the same time, the first blade 210 and the second blade 220 can be formed using different materials. On the one hand, this can provide stable support for the blade 200, and on the other hand, it can save some materials and reduce production costs.

[0041] The number of blades (200) has a significant impact on the airflow performance of the wind turbine. Fewer blades result in poor airflow guidance and an inability to achieve uniform airflow in all directions, while a larger number of blades can cause significant airflow disturbance and increase eddies, also affecting the uniformity of airflow. For example... Figure 1 As shown, the number of blades 200 in this embodiment is 6. In actual use, the number of blades 200 can be adjusted according to factors such as impeller speed and oven volume, with a preferred range of 4 to 12 blades.

[0042] Example 4

[0043] This embodiment is the fourth embodiment of the oven impeller. Similar to Embodiment 1, the difference lies in that the air guiding structure in this embodiment is a cutter blade 700 located on the other end face of the return air plate 100. The cutter blades 700 are radially and uniformly arranged around the axis of the return air plate 100. Multiple sets of cutter blades 700 are vertically arranged on the back of the return air plate 100. When the impeller rotates at high speed, the cutter blades 700 are arranged radially, aligned with the direction of centrifugal force. Centrifugal force is used to throw air outwards, simultaneously cutting and separating the high-speed rotating airflow to form a low-pressure zone. This low-pressure zone draws in external air through the pressure difference, maintaining a continuous suction effect and thereby increasing the internal air pressure.

[0044] like Figure 2 As shown, the air cutter 700 in this embodiment includes a vertically arranged fixing part 710 and an air-cutting part 720, with the fixing part 710 connected to the return air plate 100. The mutually perpendicular fixing part 710 and air-cutting part 720 form an L-shaped structure, which facilitates the installation of the air cutter 700 on the end face of the return air plate 100 and increases the connection stability between the air cutter 700 and the return air plate 100. In this embodiment, both the air-cutting part 720 and the fixing part 710 are rectangular, and the fixing part 710 is fixed to the return air plate 100 by welding.

[0045] In this embodiment, the air cutter 700 is also provided with a clearance groove to leave space for the annular groove 610 on the return air plate 100. The annular groove 610 passes through the clearance groove on each air cutter 700.

[0046] Example 5

[0047] This embodiment is the fifth embodiment of an oven impeller. Similar to any of embodiments one through four, it includes a return air plate 100, blades 200, and an air-guiding structure. Multiple sets of blades 200 are evenly arranged around the end face of the return air plate 100, forming an air inlet 300 between them, and an air outlet 400 between adjacent blades 200. The difference lies in that the air-guiding structure in this embodiment includes any two or more combinations of air-guiding rings 500, air-guiding grooves 600, guide ribs 241, and air cutters 700. Several combination examples are listed below, but the air-guiding structure of this utility model is not limited to the following combinations.

[0048] When two air guiding structures are combined, the two air guiding structures are the air guide ring 500 and the guide rib 241, respectively; for example Figure 1 , Figure 2As shown, the air guiding structure in this embodiment includes: an air guiding ring 500 connected to the top of the blade 200, the air guiding ring 500 including a first arc portion 510, an annular portion 520 and a second arc portion 530 arranged from top to bottom; an air guiding groove 600 disposed between the blade 200 and the return air plate 100, the air guiding groove 600 including an annular groove 610 disposed on the end face of the return air plate 100 and a concave hole 620 disposed on the bottom of the blade 200; the air guiding structure in this embodiment also includes: a guide rib 241 disposed on the air guiding portion 240; and a cutter blade 700 disposed on the other end face of the return air plate 100. The blade 200 in this embodiment includes a second connecting portion 250 disposed on the top of the blade 200 for connecting the air guiding ring 500.

[0049] When three air guiding structures are combined, the three air guiding structures are an air guiding ring 500, a guide rib 241, and an air guiding groove 600, and their specific configurations are described in Examples 1 to 3. When four air guiding structures are combined, the four air guiding structures are an air guiding ring 500, an air guiding groove 600, a guide rib 241, and an air cutter 700, and their specific configurations are described in Examples 1 to 4.

[0050] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An oven convection fan, characterized in that, The device includes a return air plate (100), blades (200), and an air guiding structure that guides the air. Multiple sets of blades (200) are evenly arranged around the end face of the return air plate (100), and an air inlet (300) is formed between the multiple sets of blades (200). An air outlet (400) is formed between adjacent blades (200). The air guiding structure is provided on or connected to the blades (200), and / or the air guiding structure is provided on or connected to the return air plate (100).

2. The oven convection fan according to claim 1, characterized in that, The air guiding structure is an air guiding ring (500) connected to the top of the blade (200), and the axis of the air guiding ring (500) coincides with the axis of the return air plate (100).

3. The oven convection fan according to claim 2, characterized in that, The air guide ring (500) includes a first arc portion (510), an annular portion (520) and a second arc portion (530) arranged from top to bottom. The diameter of the outer edge of the second arc portion (530) is equal to the diameter of the return air plate (100), and the diameter of the outer edge of the first arc portion (510) is smaller than the diameter of the return air plate (100).

4. The oven convection fan according to claim 1, characterized in that, The air guiding structure is an air guiding groove (600) located between the blade (200) and the return air plate (100).

5. The oven convection fan according to claim 4, characterized in that, The air guide groove (600) includes an annular groove (610) on the end face of the return air plate (100) and a recess (620) on the bottom of the blade (200). The axis of the annular groove (610) coincides with the axis of the return air plate (100).

6. The oven convection fan according to claim 1, characterized in that, The blade (200) includes a vertically arranged first connecting part (230) and a guide part (240). The first connecting part (230) is connected to the return air plate (100). The guide structure is a guide rib (241) provided on the guide part (240).

7. The oven convection fan according to claim 6, characterized in that, The blade (200) includes a first blade (210) and a second blade (220) stacked together, and the guide rib (241) is disposed on the first blade (210) or the second blade (220).

8. The oven convection fan according to claim 1, characterized in that, The air guiding structure is a cutter blade (700) located on the other end face of the return air plate (100), and the cutter blade (700) is arranged radially and uniformly around the axis of the return air plate (100).

9. The oven convection fan according to claim 8, characterized in that, The air cutter (700) includes a vertically arranged fixing part (710) and an air cutting part (720), and the fixing part (710) is connected to the return air plate (100).

10. The oven convection fan according to any one of claims 1 to 9, characterized in that, The return air plate (100) has a countersunk hole (110) at its center, and the countersunk hole (110) has a through hole (120) at its center.

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