Upper air inlet multi-layer uniform baking oven

Abstract

The utility model discloses an upper air inlet multi-layer uniform baking oven which comprises an oven body, a door body, an oven inner container and a shell. The top of the oven liner arches upwards to form a mounting cover, a fan cover plate is arranged below the mounting cover, and a space between the mounting cover and the fan cover plate forms an air guide interlayer; a baking cavity is formed in the space of the oven liner below the fan cover plate; a heating assembly and fan blades are arranged in the air guide interlayer, and the heating assembly is arranged around the peripheral sides of the fan blades. An upper air inlet is formed in the middle of the fan cover plate, and an upper air outlet is formed in the periphery. At least two layers of baking trays are placed in the baking cavity, ventilation structures are arranged on the baking trays, and ventilation gaps are formed in the front sides and the rear sides of the baking trays respectively. The hot air mechanism is arranged at the top of the oven body, the design of upper air inlet and lower air outlet is adopted, hot air uniformly flows downwards from the top, and the problem that hot air distribution is not uniform due to the fact that a fan is located on the rear wall of a traditional oven is solved. Moreover, the heating assembly is arranged around the periphery of the fan blade, and the upper air outlet is combined, so that the hot air is uniformly diffused in the baking cavity.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen appliance technology, specifically relating to a top-air-intake multi-layer oven for even baking. Background Technology

[0002] In the field of kitchen appliance technology, ovens, as kitchen appliances with baking functions, are widely used in home and commercial kitchens to meet diverse cooking needs. In traditional oven designs, the fan is usually installed at the back of the device. Its working principle is: when the fan is turned on, the generated airflow is heated by the heating element inside the oven and converted into hot air. This hot air is then guided into the oven cavity to bake the food placed on the baking tray. For example, in the prior art, Chinese patent CN210643746U discloses an electric oven with an air frying function. The hot air assembly of this electric oven includes a front shell, a rear shell, a fan, and heating elements installed in a front-to-back position. The front shell is installed behind the rear wall of the inner shell, forming a hot air cavity between the front shell and the inner shell. The fan blades are located inside the hot air cavity facing the rear wall of the inner shell, and the heating elements are installed around the fan blades inside the hot air cavity.

[0003] While the aforementioned existing technologies can achieve heat insulation, this traditional design has significant drawbacks, especially in multi-layer baking applications. Because the fan is located on the rear wall of the oven's inner shell, and the oven has a door on the front, this results in an uneven distribution of hot airflow inside the oven. Specifically, the side closer to the fan experiences a larger flow and higher temperature of hot air, as this is the direct source of the heat; while the side closer to the door experiences a relatively lower temperature due to the attenuation of the hot air during its flow. This uneven temperature distribution is particularly noticeable at different locations on the same baking tray. Food near the fan is prone to over-baking and burning, while food near the door may be under-baked and fail to achieve the desired cooking effect, resulting in poor taste.

[0004] Therefore, there is an urgent need for a top-airflow, multi-layer oven for even baking to solve the problem of uneven temperature in traditional ovens on the same baking tray. Summary of the Invention

[0005] In response to the problems in related technologies, this utility model proposes a top-inlet multi-layer uniform baking oven to overcome the aforementioned technical problems in existing related technologies. Through the top-inlet design and multi-layer uniform baking structure, this utility model achieves uniform hot air distribution and improves the baking effect.

[0006] The technical solution of this utility model is implemented as follows: a multi-layer oven with top air intake and uniform baking, including a box body and a door body, wherein the box body includes an inner oven liner and an outer shell arranged in sequence, and the front side of the inner oven liner is covered by the door body;

[0007] The top of the oven liner arches upward to form a mounting cover, and a fan cover is provided below the mounting cover. The space between the mounting cover and the fan cover forms an air guide layer.

[0008] The oven cavity is formed by the space inside the oven liner below the fan cover.

[0009] The top of the housing is equipped with a hot air mechanism, which includes a fan and fan blades;

[0010] The air guide layer is equipped with a heating component and the fan blades, and the heating component is arranged around the periphery of the fan blades;

[0011] The fan cover has an upper air inlet in the middle and an upper air outlet around the upper air inlet; each air outlet connects the baking cavity and the air guide partition; the fan is rotated to draw air into the baking cavity, and the air is drawn upward through the upper air inlet. The airflow blown out by the fan flows towards the mounting cover. The upward airflow is blocked and guided by the mounting cover and flows in the opposite direction, and then flows downward through the upper air outlet and re-enters the baking cavity.

[0012] The baking cavity contains at least two baking trays, each of which has a ventilation structure; a first ventilation gap is provided between the front side of each baking tray and the door, and a second ventilation gap is provided between the rear side of each baking tray and the rear side wall of the oven liner.

[0013] Furthermore, the hot air mechanism is provided with at least two fans, and the two fans are arranged side by side;

[0014] Furthermore, the fan also includes a motor for driving the fan blades to rotate, the motor being disposed between the housing and the mounting cover; the rotating shaft of the motor passes downward through the mounting cover and is driven to connect to the fan blades.

[0015] Furthermore, the fan has axial air inlet and radial air outlet.

[0016] Preferably, the fan is a centrifugal fan.

[0017] Furthermore, the heating assembly includes a heating tube;

[0018] It should be noted that in this utility model, the heating tube is a single annular heating tube that simultaneously wraps around the fan blades of two fans to provide a uniform heating effect; or the heating tube body is configured as two independent annular rings that respectively surround the circumference of the two fan blades, which also has the same technical effect.

[0019] Furthermore, the middle part of the fan cover plate is lowered to form a platform, and multiple upper air inlets are provided on the platform;

[0020] Furthermore, the upper air inlet is a through hole that runs through the upper and lower sides of the platform, and the shape of the through hole includes circular, elliptical, or square.

[0021] Furthermore, the fan cover is provided with the upper air outlet around the perimeter of the settling platform; an adjustable guide plate is provided directly below the upper air outlet for guiding hot air to be discharged obliquely; one side of the adjustable guide plate is connected to the fan cover, and the other side extends downward at an angle.

[0022] Furthermore, the bottom of the fan cover is provided with an adjustment rod, which extends from the adjustable guide plate on the front side of the fan cover to the adjustable guide plate on the rear side of the fan cover. The user can adjust the tilt of the front and rear adjustable guide plates by using the adjustment rod.

[0023] Furthermore, the upper air outlet is a strip-shaped hole, and the upper air outlet is set along the width or length of the fan cover plate.

[0024] Furthermore, the ventilation structure includes vents evenly distributed on the bottom surface of the baking pan.

[0025] Furthermore, the baking tray has support edges at both ends along its width, and the ventilation structure also includes punching holes evenly distributed on the support edges;

[0026] Furthermore, the support edge has at least one stamping hole, which is arranged along the length of the support edge; or the support edge has multiple stamping holes evenly distributed, which are arranged side by side along the length of the support edge, and the multiple stamping holes together have the same technical effect as a single long stamping hole.

[0027] Furthermore, in the utility model, the baking tray includes a perforated baking rack.

[0028] Furthermore, the oven liner includes two inner sidewalls for placing the baking tray, and multiple pairs of clips for placing the support edge are symmetrically provided on the two inner sidewalls.

[0029] Furthermore, the card portion includes a protruding edge that protrudes inward from the inner sidewall; or the card portion is a card groove that is recessed outward from the inner sidewall;

[0030] In this invention, three pairs of clips are symmetrically provided on the inner sidewalls on both sides, so that each baking tray can be placed on any layer.

[0031] Furthermore, each of the card portions has a stop at its end, which is perpendicular to the baking tray to prevent the baking tray from going too deep when placed into the baking cavity.

[0032] Furthermore, the inner wall of the oven cavity is provided with a reflective layer, which is made of mirror stainless steel to improve the efficiency of heat energy utilization.

[0033] The beneficial effects of this utility model are:

[0034] (1) By setting the hot air mechanism at the top of the oven and adopting the design of top air intake and bottom air exhaust, the hot air flows evenly downward from the top, avoiding the problem of uneven hot air distribution caused by the fan being located on the back wall in traditional ovens.

[0035] (2) The heating component in the hot air mechanism of this utility model is arranged around the fan blades. Combined with the upper air outlet design of the fan cover, it ensures that the hot air is evenly diffused in the baking cavity, so that the temperature of different positions on the same baking tray is consistent, and avoids local scorching or under-baking of food.

[0036] (3) The oven cavity of this utility model is provided with at least two baking trays, each baking tray is provided with a ventilation structure, and combined with the first ventilation gap and the second ventilation gap on the front and back sides of the baking tray, hot air flows evenly between the multiple baking trays, so as to realize the synchronous and uniform baking of multiple food layers. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a multi-layer oven with top air intake according to the present invention;

[0038] Figure 2 This is a top view of a multi-layer oven with top air intake according to the present invention;

[0039] Figure 3 for Figure 2 Sectional view along axis AA;

[0040] Figure 4 for Figure 2 BB-direction sectional view;

[0041] Figure 5 This is a schematic diagram of the hot air flow direction of a top-inlet multi-layer uniform baking oven according to the present invention;

[0042] Figure 6 This is a schematic diagram of another hot air flow direction in a top-inlet multi-layer uniform baking oven according to the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of a top-intake multi-layer oven with uniform baking after removing the door.

[0044] Figure 8 This is a schematic diagram of the structure of the baking pan of this utility model;

[0045] Figure 9 This is a schematic diagram of the structure of the fan cover plate of this utility model.

[0046] Marker explanation:

[0047] 1. Door; 2. Cabinet; 21. Oven liner; 211. Mounting cover; 212. Baking cavity; 213. Clip; 214. Baffle; 22. Outer shell; 3. Fan; 31. Fan blade; 32. Motor; 4. Fan cover; 41. Recessed platform; 411. Upper air inlet; 42. Upper air outlet; 43. Adjustable guide vane; 5. Air guide partition; 6. Heating element; 7. Baking tray; 71. Ventilation hole; 72. Support edge; 721. Stamping hole; 8. First ventilation gap; 9. Second ventilation gap. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0050] like Figure 1-4 As shown, this embodiment provides a top-air-intake multi-layer uniform baking oven, including a box body 2 and a door body 1. The box body 2 includes an oven liner 21 and an outer shell 22 arranged in sequence. The front side of the oven liner 21 is open and exposed outside the outer shell 22. The open front side of the oven liner 21 is covered by the door body 1.

[0051] The top of the oven liner 21 arches upward to form a mounting cover 211. A fan cover 4 is provided below the mounting cover 211. The space between the mounting cover 211 and the fan cover 4 forms an air guide layer 5.

[0052] The space of the oven liner 21 below the fan cover plate 4 forms a baking cavity 212;

[0053] The top of the housing 2 is provided with a hot air mechanism, which includes a fan 3 and a fan blade 31.

[0054] The air guide layer 5 is provided with a heating component and the fan blade 31, and the heating component is arranged around the periphery of the fan blade 31;

[0055] like Figure 9 As shown, the fan cover 4 has an upper air inlet 411 in the middle and upper air outlets 42 around the upper air inlet 411; each air outlet is connected to the baking cavity 212 and the air guide partition 5; as shown Figure 5-6 As shown, the fan 3 is configured to rotate to draw air into the baking cavity 212, and the air enters upward through the upper air inlet 411. The airflow blown out by the fan 3 flows towards the mounting cover 211. The upward airflow flows in the opposite direction under the obstruction and guidance of the mounting cover 211, and exits downward through the upper air outlet 42, and re-enters the baking cavity 212.

[0056] like Figure 7 As shown, at least two baking trays 7 are placed inside the baking cavity 212, and each baking tray 7 is provided with a ventilation structure; as Figure 4 As shown, a first ventilation gap 8 is provided between the front side of each baking tray 7 and the door 1, and a second ventilation gap 9 is provided between the rear side of each baking tray 7 and the rear side wall of the oven liner 21.

[0057] First, in this embodiment, by setting the hot air mechanism at the top of the box 2 and adopting a top air intake and bottom air exhaust design, the hot air flows evenly downward from the top, avoiding the problem of uneven hot air distribution caused by the fan 3 being located on the rear wall in traditional ovens.

[0058] Secondly, the heating component in the hot air mechanism described in this embodiment is arranged around the fan blade 31. Combined with the design of the upper air outlet 42 of the fan cover plate 4, it ensures that the hot air is evenly diffused in the baking cavity 212, so that the temperature of different positions on the same baking tray 7 is consistent, and avoids local burning or under-baking of food.

[0059] Secondly, the baking cavity 212 is provided with at least two baking trays 7, each baking tray 7 is provided with a ventilation structure, and combined with the first ventilation gap 8 and the second ventilation gap 9 on the front and rear sides of the baking tray 7, hot air is ensured to flow evenly between the multiple baking trays 7, so as to achieve synchronous and uniform baking of multiple layers of food.

[0060] Finally, the design of the air guide layer 5 of the hot air mechanism and the surrounding layout of the heating components maximize the use of hot air energy; at the same time, the design of the mounting cover 211 and the fan cover plate 4 on the top of the oven liner 21 not only optimizes the hot air flow path, but also makes the overall structure of the oven more compact.

[0061] Specifically, the hot air mechanism is provided with at least two fans 3, and the two fans 3 are arranged side by side;

[0062] In this embodiment, by setting two parallel fans 3, hot air can enter the baking cavity 212 simultaneously from multiple locations, avoiding the problem of localized hot air concentration caused by a single fan 3. Simultaneously, the dual-fan design can cover a larger area of ​​the baking cavity 212, ensuring that the hot air is evenly distributed within the cavity, especially in multi-layer baking scenarios, significantly improving the temperature uniformity at different locations on the same baking tray 7. Furthermore, the simultaneous operation of the two fans 3 can accelerate the hot air circulation speed, shorten the oven preheating time, and improve baking efficiency. In addition, the parallel arrangement of the fans 3 can create a synergistic effect, further enhancing the flow and penetration of the hot air, ensuring more even heating of the food.

[0063] More specifically, the fan 3 also includes a motor 32 for driving the fan blades 31 to rotate, the motor 32 being disposed between the housing 22 and the mounting cover 211; the rotating shaft of the motor 32 passes downward through the mounting cover 211 and is drivenly connected to the fan blades 31;

[0064] By placing the motor 32 between the outer casing 22 and the mounting cover 211, the space at the top of the oven is fully utilized, and the motor 32 is prevented from occupying the internal space of the baking cavity 212, thus maximizing the effective volume of the baking cavity 212. This layout makes the overall structure of the oven more compact.

[0065] Specifically, the fan 3 has axial air inlet and radial air outlet;

[0066] It should be noted that the fan 3 is a centrifugal fan; the centrifugal fan can generate high air pressure, which is suitable for scenarios that need to overcome the resistance inside the baking cavity 212, ensuring that hot air can pass through the multiple baking trays 7 and be evenly distributed. Moreover, the radial air outlet characteristics of the centrifugal fan are highly matched with the top hot air mechanism design of the baking cavity 212, which can achieve uniform flow of hot air from top to bottom, avoiding the problem of uneven hot air distribution caused by improper placement of the fan 3 in traditional ovens.

[0067] Specifically, the heating assembly includes a heating tube 6;

[0068] It should be noted that in this embodiment, the heating tube 6 includes a single annular heating tube 6, which simultaneously wraps around the fan blades 31 of the two fans 3 to provide a uniform heating effect; or the tube body of the heating tube 6 is set into two independent annular rings and respectively surrounds the periphery of the fan blades 31 of the two fans 3, which also has the same technical effect.

[0069] Specifically, the middle part of the fan cover plate 4 is sunken to form a platform 41, and a plurality of upper air inlets 411 are provided on the platform 41;

[0070] More specifically, the upper air inlet 411 is a through hole that passes through the upper and lower sides of the recessed platform 41, and the shape of the through hole includes circular, elliptical or square.

[0071] Specifically, the fan cover plate 4 is provided with an upper air outlet 42 around the periphery of the settling platform 41; an adjustable guide plate 43 for guiding hot air to be discharged obliquely is provided directly below the upper air outlet 42; one side of the adjustable guide plate 43 is connected to the fan cover plate 4, and the other side extends downward at an angle.

[0072] In this embodiment, the adjustable air guide plate 43 is located directly below the upper air outlet 42, which can guide the hot air to be discharged at an angle, avoiding the hot air directly impacting the food vertically downward, thereby reducing local overheating. Moreover, the angled discharge of hot air can form a more uniform airflow distribution in the baking cavity 212, especially in multi-layer baking scenarios, ensuring that the food on each baking tray 7 is heated evenly.

[0073] It should be noted that in this embodiment, the design of the adjustable air deflector 43 allows the user to flexibly adjust the flow direction and intensity of the hot air according to different food types and baking requirements. For example, for foods that need to be baked quickly, the tilt angle of the air deflector can be increased to make the hot air cover the food surface more concentrated; for foods that need to be baked gently, the tilt angle of the air deflector can be decreased to make the hot air more evenly distributed in the baking cavity 212.

[0074] More specifically, the bottom of the fan cover plate 4 is provided with an adjustment rod, which extends from the adjustable guide plate 43 on the front side of the fan cover plate 4 to the adjustable guide plate 43 on the rear side of the fan cover plate 4. The user can adjust the tilt of the front and rear adjustable guide plates 43 by means of the adjustment rod.

[0075] In this embodiment, the tilt angle of the guide plate can be adjusted by adjusting the lever, which can change the flow path and coverage of the hot air, so that the hot air can reach all corners of the baking cavity 212 better, avoiding the difference in baking effect caused by uneven hot air distribution in traditional ovens.

[0076] More specifically, the upper air outlet 42 is a strip-shaped hole, and the upper air outlet 42 is provided along the width or length of the fan cover plate 4;

[0077] In this embodiment, the elongated shape of the strip-shaped holes reduces the resistance of hot air at the air outlet, improves the flow efficiency of hot air, and ensures that hot air can enter the baking cavity 212 quickly and evenly. At the same time, the design of the strip-shaped holes allows the hot air to be discharged in a more dispersed manner, reducing the possibility of hot air directly impacting the surface of the food, thereby avoiding local overheating and improving the baking quality of the food.

[0078] like Figure 8 As shown, the ventilation structure includes vents 71 evenly distributed on the bottom surface of the baking pan 7;

[0079] The ventilation holes 71 are evenly distributed on the bottom surface of the baking tray 7, allowing hot air to pass smoothly through the baking tray 7 and into the next / upper layer of baking tray 7, ensuring unobstructed hot air flow between the multiple layers of baking tray 7. At the same time, the even distribution of the ventilation holes 71 allows hot air to pass through the baking tray 7 in a more uniform manner, avoiding hot air concentration or insufficient heat in local areas, thereby ensuring that the food on each layer of baking tray 7 is heated evenly.

[0080] In this embodiment, the size and density of the vent holes 71 can be optimized according to the hot air requirements to further balance the uniformity and efficiency of the hot air flow.

[0081] Specifically, the baking tray 7 has a support edge 72 at both ends along its width, and the ventilation structure also includes punch holes 721 evenly distributed on the support edge 72;

[0082] More specifically, the support edge 72 has at least one punching hole 721, which is arranged along the length of the support edge 72; or the support edge 72 has a plurality of punching holes 721 evenly distributed, which are arranged side by side along the length of the support edge 72, and the plurality of punching holes 721 together have the same technical effect as a single long punching hole 721.

[0083] The stamping holes 721 are evenly distributed on the support edge 72, which not only optimizes the flow of hot air but also reduces the weight of the support edge 72 while maintaining its structural strength. Moreover, the design of the vent holes 71 and the stamping holes 721 allows hot air to form convection between the baking trays 7, improving the circulation efficiency of hot air and ensuring a more uniform temperature distribution within the baking cavity 212.

[0084] Specifically, in this embodiment, the baking tray 7 includes a perforated baking rack.

[0085] Specifically, the oven liner 21 includes two inner sidewalls for placing the baking tray 7, and multiple pairs of clips 213 for placing the support edge 72 are symmetrically provided on the two inner sidewalls.

[0086] More specifically, the card portion 213 includes a protruding edge that protrudes inward from the inner sidewall; or the card portion 213 is a card groove that is recessed outward from the inner sidewall;

[0087] In this embodiment, three pairs of card portions 213 are symmetrically provided on the inner sidewalls on both sides, so that each baking tray 7 can be placed on any layer.

[0088] Specifically, each of the card portions 213 has a stop portion 214 at its end, and the stop portion 214 is set perpendicular to the baking tray 7 to prevent the baking tray 7 from going too deep when it is placed into the baking cavity 212.

[0089] Specifically, the inner wall of the oven liner 21 is provided with a reflective layer, which is made of mirror stainless steel to improve the efficiency of heat energy utilization.

[0090] like Figure 5 As shown, the hot air generated by each of the fans 3 enters the baking cavity 212 obliquely downwards from the air guide layer 5 through the upper air outlet 42 on the periphery of the fan cover plate 4, along the adjustable guide plate 43. Part of the hot air blows directly onto the first baking tray 7, while part of the hot air passes through the stamping holes 721 and blows onto the next baking tray 7. For example... Figure 6 As shown, the hot air on the front flows directly downward through the first ventilation gap 8, while the hot air on the rear flows directly downward through the second ventilation gap 9.

[0091] like Figure 5-6 As shown, some of the hot air is reflected by the inner wall of the oven liner 21. Some of the hot air blowing directly onto the first baking tray 7 will be blown onto the next baking tray 7 through the vent 71. Hot air reflected back from the bottom of the oven liner 21 can also flow to the first baking tray 7 through the vent 71.

[0092] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A top-air-intake, multi-layer oven for even baking, comprising a housing and a door, wherein the housing includes an inner oven liner and an outer shell arranged sequentially inside and outside, and the front side of the inner oven liner is covered by the door, characterized in that: The top of the oven liner arches upward to form a mounting cover, and a fan cover is provided below the mounting cover. The space between the mounting cover and the fan cover forms an air guide layer. The oven cavity is formed by the space inside the oven liner below the fan cover. The top of the housing is equipped with a hot air mechanism, which includes a fan and fan blades; The air guide layer is equipped with a heating component and the fan blades, and the heating component is arranged around the periphery of the fan blades; The fan cover has an upper air inlet in the middle and an upper air outlet around the upper air inlet; each air outlet connects the baking cavity and the air guide partition; the fan is rotated to draw air into the baking cavity, and the air is drawn upward through the upper air inlet. The airflow blown out by the fan flows towards the mounting cover. The upward airflow is blocked and guided by the mounting cover and flows in the opposite direction, and then flows downward through the upper air outlet and re-enters the baking cavity. The baking cavity contains at least two baking trays, each of which has a ventilation structure; a first ventilation gap is provided between the front side of each baking tray and the door, and a second ventilation gap is provided between the rear side of each baking tray and the rear side wall of the oven liner.

2. The multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, The fan also includes a motor for driving the fan blades to rotate, the motor being located between the housing and the mounting cover; the motor's rotating shaft passes downward through the mounting cover and is driven to connect with the fan blades; the fan has axial air intake and radial air outlet.

3. The multi-layer oven with top air intake and uniform baking according to claim 2, characterized in that, The fan is a centrifugal fan.

4. The multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, The hot air mechanism is provided with at least two fans, and the two fans are arranged side by side.

5. A multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, The center of the fan cover plate is recessed to form a platform, and multiple upper air inlets are provided on the platform; the fan cover plate is provided with upper air outlets around the platform.

6. The multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, An adjustable guide plate is provided directly below the upper air outlet to guide hot air to be discharged obliquely; one side of the adjustable guide plate is connected to the fan cover plate, and the other side extends downward at an angle.

7. A multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, The upper air outlet is a strip-shaped hole, and the upper air outlet is set along the width or length of the fan cover plate.

8. A multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, The ventilation structure includes air vents evenly distributed on the bottom surface of the baking pan.

9. A multi-layer oven with top air intake and uniform baking according to claim 1, characterized in that, The baking pan has support edges at both ends along its width, and the ventilation structure also includes punched holes evenly distributed on the support edges.

10. A multi-layer oven with top air intake and uniform baking according to claim 9, characterized in that, The oven liner includes two inner walls on both sides for placing the baking tray, and multiple pairs of clips for placing the tray are symmetrically arranged on the two inner walls.

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