Heat dissipation structure and cooking equipment

Abstract

This utility model relates to a heat dissipation structure and a cooking device. The heat dissipation structure includes: an upper mounting plate; a lower air guide plate disposed below the upper mounting plate, forming an air inlet channel with the lower wall of the upper mounting plate, the air inlet channel having an air intake facing the air outlet of the door; an upper air guide plate disposed above the upper mounting plate, forming a first exhaust channel with the upper wall of the upper mounting plate, the first exhaust channel having a first exhaust port; a first fan disposed on the upper mounting plate, the air inlet channel and the first exhaust channel being connected by the first fan, the first fan being configured to drive air from the air inlet of the door through the air intake into the air inlet channel, and then through the first fan into the first exhaust channel before being discharged from the first exhaust port; the upper air guide plate also forms a second exhaust channel independent of the first exhaust channel with the upper wall of the upper mounting plate, the second exhaust channel being connected to the cooking chamber and used for exhausting steam.

Description

Technical Field

[0001] This utility model relates to the technical field of heat dissipation structure, and in particular to a heat dissipation structure and cooking equipment. Background Technology

[0002] A steam oven is a cooking appliance that integrates steaming and baking functions. Its cavity generates a large amount of heat and steam during operation. Traditional steam ovens typically have an air duct structure at the upper mounting plate location, consisting of an upper mounting plate, a guide plate, and a centrifugal fan. Its main function is to dissipate heat from the components on the upper mounting plate and to expel steam from inside the cavity.

[0003] However, traditional solutions have the following shortcomings: First, the air duct can only dissipate heat from the components on the upper mounting plate, and the coverage of the air duct is limited. The door area lacks an effective heat dissipation path, resulting in a high temperature rise in the door and handle. Second, the airflow driving force of the fan in the air duct is limited, and the flow rate is low, which cannot simultaneously meet the needs of large-area heat dissipation and rapid exhaust. Third, after high-temperature steam mixes with the heat dissipation air, the steam condensation will affect the heat dissipation efficiency. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the current heat dissipation structure of cooking equipment cannot simultaneously achieve both heat dissipation range and efficiency, and to provide a heat dissipation structure that can dissipate heat from the door and has high efficiency in both heat dissipation and steam exhaust.

[0005] This application first provides a heat dissipation structure, including: Upper mounting plate; The lower air guide plate is located below the upper mounting plate and forms an air inlet channel with the lower wall of the upper mounting plate. The air inlet channel has an air intake port facing the air outlet of the door. An upper air guide plate is disposed above the upper mounting plate and forms a first external exhaust channel with the upper wall of the upper mounting plate. The first external exhaust channel has a first exhaust port. A first fan is installed on the upper mounting plate. The air inlet channel and the first exhaust channel are connected through the first fan. The first fan is configured to drive air from the air inlet of the door body into the air inlet channel through the air intake, and then into the first exhaust channel through the first fan before being discharged from the first exhaust port. The upper air guide plate and the upper wall of the upper mounting plate also form a second external exhaust channel, and the first external exhaust channel and the second external exhaust channel are independent of each other; The heat dissipation structure also includes a second fan disposed on the upper mounting plate and connected to the second exhaust channel. The second exhaust channel also has a second exhaust vent that is opened side by side with the first exhaust vent in the width direction. The second exhaust channel is connected to the cooking box and is used to exhaust steam.

[0006] With this configuration, the lower air guide plate and the upper mounting plate enclose each other to form an air inlet channel, and the upper air guide plate and the upper mounting plate enclose each other to form a first exhaust channel and a second exhaust channel. The first fan and the second fan are configured to drive the two exhaust channels respectively, thus realizing a complete door heat dissipation air duct circulation and independent steam exhaust function within a limited space. Specifically, the first fan drives air from the door body through the air inlet into the air intake channel, and after passing through the first exhaust channel, it is discharged from the first exhaust port, effectively reducing the temperature rise of the door body and handle; the second exhaust channel is connected to the cooking oven and independently exhausts steam under the drive of the second fan; since the first exhaust channel and the second exhaust channel are independent of each other, the heat dissipation air and high-temperature steam in the door body flow separately in their respective channels and are discharged independently, and the two airflows will not mix or interfere with each other, avoiding the adverse effects of steam condensation on the heat dissipation efficiency of the door body; The second exhaust vent is arranged side by side with the first exhaust vent along the width direction, unifying the air outlet direction and maximizing the use of the exhaust port area above the upper mounting plate. Combined with the air intake channel below the upper mounting plate, it integrates three functions in a limited space: air intake, door heat dissipation exhaust, and steam exhaust.

[0007] In one embodiment, the heat dissipation structure further includes a water tank disposed above the upper mounting plate, and the first exhaust channel is located between the second exhaust channel and the water tank.

[0008] This design, by limiting the first exhaust channel to be located between the second exhaust channel and the water tank, makes reasonable use of the limited space above the upper mounting plate, naturally separating the steam exhaust channel from the door heat dissipation channel in space, while preventing the diffusion of humid air into the water tank area.

[0009] In one embodiment, the area A1 of the first exhaust vent and the area A2 of the second exhaust vent satisfy the condition: 1.2A1≤A2≤2.5A1.

[0010] This configuration, by limiting the area ratio of the first exhaust vent to the second exhaust vent to 1.2A1 to 2.5A1, ensures that the exhaust area of ​​the two exhaust channels matches the heat load they bear, guaranteeing that the second exhaust channel has sufficient heat dissipation airflow while ensuring smooth exhaust of the first exhaust channel.

[0011] In one embodiment, the first fan is offset on one side of the upper mounting plate along the width direction of the upper mounting plate, and the second fan is offset on the other side of the upper mounting plate along the width direction of the upper mounting plate.

[0012] This configuration, by offsetting the first and second fans to the two sides of the upper mounting plate, rationally allocates the installation space above the upper mounting plate, achieving an effective arrangement of the two fans within a limited area, while avoiding conflicts in the installation positions of the two fans.

[0013] In one embodiment, the inner wall of the lower air guide plate and / or the bottom wall of the upper mounting plate are provided with guide ribs along the airflow direction. The guide ribs divide the air inlet channel into a first channel, a second channel and a third channel in sequence along the width direction of the upper mounting plate from the side where the first fan is located to the side where the second fan is located.

[0014] This configuration, by setting guide ribs on the inner wall of the lower air guide plate, divides the air inlet channel into the first channel, the second channel and the third channel along the width direction of the upper mounting plate, providing independent guide paths for multiple airflows and providing a structural basis for the uniform distribution of air volume at each air intake.

[0015] In one embodiment, the air inlet channel satisfies: A32 / A31 > A22 / A21 > A12 / A11; wherein A32 is the inlet area of ​​the third channel, A31 is the outlet area of ​​the third channel, A22 is the inlet area of ​​the second channel, A21 is the outlet area of ​​the second channel, A12 is the inlet area of ​​the first channel, and A11 is the outlet area of ​​the first channel.

[0016] This configuration, by limiting the ratio of the upstream inlet area to the downstream confluence cross-sectional area of ​​the first, second, and third channels to satisfy A32 / A31 > A22 / A21 > A12 / A11, compensates for the difference in friction resistance caused by the asymmetrical structure due to the fan offset, making the flow rate of each channel more consistent, thereby ensuring uniform air intake at each air inlet and achieving uniform lateral heat dissipation of the door.

[0017] In one embodiment, the air inlet channel gradually shrinks in area from the air intake side to the first fan side.

[0018] This configuration, by gradually reducing the channel area from the air inlet side to the first fan side, matches the negative pressure distribution caused by the fan's suction, thereby reducing airflow loss along the path and improving the fan's working efficiency.

[0019] In one embodiment, the width of the air inlet channel gradually narrows from the air intake side to the first fan side.

[0020] This design, by gradually narrowing the width of the air intake channel, further guides the airflow to converge evenly, reduces the occurrence of eddies and flow separation, and improves the airflow organization inside the air intake channel.

[0021] In one embodiment, the height of the air inlet channel from the air intake side to the first fan side remains constant.

[0022] With this configuration, the airflow is not affected by changes in the channel height in the vertical direction, and there will be no difference in flow velocity or eddies in the vertical direction due to the reduction in height, thus ensuring a uniform distribution of airflow in the vertical direction within the channel cross-section.

[0023] This application also provides a cooking device, including a cooking box, a door, and the aforementioned heat dissipation structure. The door is closable and can be installed in the cooking box. The upper mounting plate is fixed to the top of the cooking box. The door has a heat dissipation channel inside. When the door is closed, the air outlet of the heat dissipation channel faces the air intake.

[0024] This design, by applying the heat dissipation structure to the cooking equipment, ensures that the air outlet of the door's heat dissipation channel faces the air intake on the lower air guide plate when the door is closed, thus ensuring that hot air in the door can be efficiently drawn into the air intake channel, forming a smooth heat dissipation airflow path. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the airflow path of the heat dissipation structure of this application; Figure 2 This is a top view of the heat dissipation structure of this application; Figure 3 for Figure 2 A schematic diagram of the upper and middle air guide plates after they have been flipped. Figure 4 for Figure 2 A 3D diagram after being flipped over; Figure 5 This is a three-dimensional schematic diagram of the lower air guide plate in the heat dissipation structure of this application; Figure 6 This is a schematic diagram of the velocity field distribution of the air inlet channel of the heat dissipation structure of this application.

[0026] Attached reference numerals: 1. Door; 2. Cooking box; 10. Upper mounting plate; 20. Lower air guide plate; 21. Air guide rib; 30. Air inlet channel; 30a. Air intake; 31. First channel; 32. Second channel; 33. Third channel; 40. Upper air guide plate; 50. First exhaust channel; 51. First exhaust vent; 60. First fan; 70. Second exhaust channel; 71. Second exhaust vent; 80. Second fan; 90. Water tank. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 element 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.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Please combine Figures 1 to 4 As shown, this application provides a heat dissipation structure suitable for cooking equipment such as steam ovens. This heat dissipation structure achieves effective heat dissipation in the door area by constructing a complete door heat dissipation airflow circulation.

[0034] Specifically, the heat dissipation structure includes an upper mounting plate 10, a lower air guide plate 20, an upper air guide plate 40, and a first fan 60. The upper mounting plate 10 is a thin plate structure, fixed to the top of the cooking oven 2, serving as the mounting base for each air duct wall panel. The lower air guide plate 20 is located below the upper mounting plate 10, and can be fixedly connected to the lower wall of the upper mounting plate 10 by bolts or other connecting parts. The lower air guide plate 20 and the lower wall of the upper mounting plate 10 enclose an air inlet channel 30. The air inlet channel 30 has air intakes 30a facing the door 1, and the air intakes 30a are spaced apart along the length of the lower air guide plate 20 to cover the lateral heat dissipation area of ​​the door 1.

[0035] An upper air guide plate 40 is positioned above the upper mounting plate 10, forming a first exhaust channel 50 with the upper wall of the upper mounting plate 10. The first exhaust channel 50 has a first exhaust port 51 that communicates with the outside. A first fan 60 is mounted on the upper mounting plate 10, and the air inlet channel 30 is connected to the first exhaust channel 50 via the first fan 60. Driven by the first fan 60, air flows from the air inlet of the door 1 through the air intake 30a into the air inlet channel 30, flows along the air inlet channel 30 and enters the first exhaust channel 50 via the first fan 60, and is finally discharged to the outside through the first exhaust port 51, forming a complete heat dissipation airflow circulation from the bottom of the door to the door body, then to the lower air guide plate 20, the first fan 60, the upper air guide plate 40, and the outside.

[0036] In this application, when the first fan 60 is running, a negative pressure is formed in the air inlet channel 30. The hot air inside the door 1 flows through the door heat dissipation channel to its air outlet under the action of pressure difference, and is then sucked into the air inlet 30a on the lower air guide plate 20 and enters the air inlet channel 30. The hot air flows along the air inlet channel 30, is pressurized by the first fan 60 and pushed into the first exhaust channel 50, and is finally discharged to the outside of the equipment from the first exhaust port 51. Through this active heat dissipation method, the temperature rise of the door 1 and the handle is effectively reduced.

[0037] In one extended embodiment, the connection between the lower air guide plate 20 and the upper mounting plate 10 is not limited to bolt connection, but can also be achieved by snap-fit ​​connection, welding or integral molding, etc. This utility model does not limit this.

[0038] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the upper air guide plate 40 and the upper wall of the upper mounting plate 10 also enclose a second exhaust channel 70. The first exhaust channel 50 and the second exhaust channel 70 are independent of each other and there is no airflow communication. The heat dissipation structure also includes a second fan 80, which is disposed on the upper mounting plate 10 and communicates with the second exhaust channel 70. The second exhaust channel 70 has a second exhaust vent 71, which is opened side by side with the first exhaust vent 51 along the width direction of the upper mounting plate 10.

[0039] In this embodiment, by setting a partition inside the upper air guide plate 40, the space enclosed by the upper air guide plate 40 and the upper wall of the upper mounting plate 10 is divided into two independent exhaust channels, and an independent fan is configured for each of the two exhaust channels.

[0040] The first exhaust channel 50, driven by the first fan 60, is specifically used to exhaust the heat dissipation air collected by the air inlet channel 30 from the door. The second exhaust channel 70, driven by the second fan 80, is used to exhaust steam from the cooking oven 2 and heat dissipation air from the components above the upper mounting plate 10. Since the two exhaust channels are independent of each other, the two airflows will not mix or interfere with each other inside the upper air guide plate 40, ensuring their respective exhaust efficiency and heat dissipation performance.

[0041] In an extended embodiment, the second exhaust channel 70 can be further divided into multiple sub-channels, each corresponding to a different heat dissipation area, to achieve more refined airflow management.

[0042] Please refer to Figure 2 As shown, in some embodiments, the heat dissipation structure further includes a water tank 90, which is disposed above the upper mounting plate 10. A second exhaust channel 70 communicates with the cooking chamber 2 and is used to exhaust steam generated during cooking. A first exhaust channel 50 is located between the second exhaust channel 70 and the water tank 90.

[0043] In this embodiment, since the first exhaust channel 50 is specifically used to exhaust dry air after the heat dissipation of the door 1, and the second exhaust channel 70 is used to exhaust high-temperature humid steam in the cooking oven 2, the first exhaust channel 50 is arranged between the second exhaust channel 70 and the water tank 90, so that the dry air exhaust side is close to the water tank 90, thus avoiding the diffusion of humid steam into the water tank 90 area.

[0044] On the one hand, if wet steam comes into contact with the water tank 90, it may cause condensation on the surface of the water tank 90 or affect the water quality inside the water tank 90; on the other hand, this layout makes full use of the limited space above the upper mounting plate 10, so that the functional components are arranged compactly.

[0045] In addition, this layout ensures that the dry air discharged from the first exhaust channel 50 and the wet steam discharged from the second exhaust channel 70 are discharged independently from their respective exhaust ports without interfering with each other.

[0046] In one extended embodiment, the water tank 90 may be wrapped with heat-insulating material to further reduce the impact of the external drainage channel on the temperature of the water tank 90.

[0047] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the area A1 of the first exhaust vent 51 and the area A2 of the second exhaust vent 71 satisfy 1.2A1≤A2≤2.5A1.

[0048] The basis for limiting the area ratio is as follows: the second exhaust channel 70 serves as the main heat dissipation channel, undertaking the heat dissipation function of the components on the mounting plate 10 of the steam oven and the function of steam exhaust, with a large heat load; the first exhaust channel 50 mainly undertakes the heat dissipation function of the door 1, with a relatively small heat load.

[0049] If A2 is less than 1.2A1, meaning the exhaust area of ​​the second exhaust vent 71 is too small, the required cooling airflow for the second exhaust channel 70 will be insufficient, potentially causing overheating of electrical components and affecting their lifespan. Simultaneously, when high-temperature steam mixes with cooling air within the second exhaust channel 70, if exhaust is obstructed, the overall exhaust temperature will rise, posing a risk of burns to users from the high-temperature exhaust.

[0050] If A2 is greater than 2.5A1, the cross-section of the first exhaust vent 51 will be too small, the exhaust resistance of the first external exhaust channel 50 will increase, the uniformity of heat dissipation of the door will deteriorate, the temperature rise of the door 1 will increase, and the temperature rise of the door 1 handle will also increase accordingly, which will have an adverse impact on the user experience.

[0051] By limiting the area ratio to 1.2A1≤A2≤2.5A1, the air outlet area of ​​the two exhaust channels is matched with the heat load they bear, thus balancing the heat dissipation requirements of the main heat dissipation channel and the uniformity requirements of the door's heat dissipation channel.

[0052] In an extended embodiment, the first exhaust vent 51 and the second exhaust vent 71 can each be configured as an array of multiple small holes to further optimize exhaust noise and airflow distribution.

[0053] Please refer to Figure 2 As shown, in some embodiments, the first fan 60 is offset to one side of the upper mounting plate 10 along the width direction, and the second fan 80 is offset to the other side of the upper mounting plate 10 along the width direction. That is, the first fan 60 and the second fan 80 are located on opposite sides of the upper mounting plate 10 in the width direction, rather than being centrally located.

[0054] In this embodiment, since the first exhaust channel 50 and the second exhaust channel 70 need to be arranged simultaneously above the upper mounting plate 10, each exhaust channel needs to be equipped with a fan. If the two fans are arranged in the center, they cannot be installed due to space overlap. By offsetting the first fan 60 and the second fan 80 to the two sides of the upper mounting plate 10 respectively, the two fans are arranged laterally, effectively avoiding their respective installation positions, allowing the two fans to coexist within the limited space of the upper mounting plate 10.

[0055] Specifically, the first fan 60 is offset to one side of the first exhaust channel 50, which facilitates the direct intake of air from the downstream confluence section of the air inlet channel 30; the second fan 80 is offset to the second exhaust channel 70, which facilitates the pushing of steam and cooling air into the second exhaust channel 70.

[0056] In one extended embodiment, the first fan 60 and the second fan 80 may be different types and specifications of fans, and may be matched and selected according to the resistance characteristics and air volume requirements of their respective channels.

[0057] Please combine Figure 2 , Figure 4 as well as Figure 5 As shown, in some embodiments, guide ribs 21 are provided on the inner wall of the lower guide plate 20 and / or the bottom wall of the upper mounting plate 10 along the airflow direction. The guide ribs 21 divide the air inlet channel 30 into a first channel 31, a second channel 32 and a third channel 33 in sequence along the width direction of the upper mounting plate 10 from the side where the first fan 60 is located to the side where the second fan 80 is located.

[0058] Because the first fan 60 is offset to one side of the upper mounting plate 10, the air inlet channel 30 has the longest path on the side furthest from the first fan 60, the next longest path in the middle area, and the shortest path on the side closest to the first fan 60. This asymmetry results in significant differences in the air volume of each air inlet 30a if flow control is not implemented. The guide ribs 21 divide the air inlet channel 30 into three parallel sub-channels. Each sub-channel independently draws in air from its corresponding air inlet 30a, and the air converges downstream before flowing into the first fan 60, providing a structural basis for the separate control and homogenization of multiple airflows.

[0059] The airflow guide ribs 21 can be provided only on the inner wall of the lower air guide plate 20, or simultaneously on the inner wall of the lower air guide plate 20 and the bottom wall of the upper mounting plate 10 to form a complete airflow separation.

[0060] In one extended embodiment, the number of guide ribs 21 is not limited to two. The number of guide ribs 21 can be increased or decreased according to the width and uniformity requirements of the air inlet channel 30 to adapt to different channel widths.

[0061] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the ratio of the upstream inlet area to the downstream confluence cross-sectional area of ​​the first channel 31, the second channel 32, and the third channel 33 satisfies the following relationship: A32 / A31 > A22 / A21 > A12 / A11, where A32 is the upstream inlet area of ​​the third channel 33, A31 is the downstream confluence cross-sectional area of ​​the third channel 33, A22 is the upstream inlet area of ​​the second channel 32, A21 is the downstream confluence cross-sectional area of ​​the second channel 32, A12 is the upstream inlet area of ​​the first channel 31, and A11 is the downstream confluence cross-sectional area of ​​the first channel 31.

[0062] Because the area of ​​the air intake channel 30 decreases from the upstream inlet to the downstream confluence section, and the lower air guide plate 20 is asymmetrically arranged due to the offset of the first fan 60, the air guide path is shortest on the side closer to the first fan 60, followed by the middle channel, and longest on the side farther from the first fan 60. If the cross-sections of each channel are designed proportionally, the resistance along the path of the channel farther from the first fan 60 is the greatest, and the resistance along the path of the channel closer to the first fan 60 is the smallest. This will inevitably lead to uneven air intake at each air inlet 30a, thus affecting the lateral heat dissipation uniformity of the door 1.

[0063] Therefore, by limiting the area ratio relationship of A32 / A31 > A22 / A21 > A12 / A11, the channels with longer flow paths have larger inlet areas to compensate for flow resistance losses, while the channels with shorter flow paths use smaller inlet areas to appropriately increase their flow resistance, thereby making the flow rates of the three channels tend to be consistent.

[0064] Reference Figure 6 After the area ratio design, the airflow velocity distribution inside the air inlet channel 30 is uniform, there is no obvious vortex and flow separation phenomenon, the velocity distribution of the air inlet section is uniform, ensuring the uniformity of lateral heat dissipation of the door body 1, and the overall flow performance is good.

[0065] It is worth mentioning that although the differences in the exit areas of the first channel 31, the second channel 32, and the third channel 33 (i.e., the differences in A32, A22, and A12), as well as the differences in other factors among the channels, will also affect the friction resistance of each channel, since the first channel 31, the second channel 32, and the third channel 33 in this application are all straight channels, for straight channels, the impact of the channel exit area difference (and other factors) on the friction resistance is much smaller than the impact of the ratio of the inlet and outlet cross-sectional areas. The latter is several times or even an order of magnitude larger than the former. Therefore, under the premise of controlling the key factor of the ratio of the inlet and outlet cross-sectional areas of each channel, this application can relatively ignore the impact of this factor on the friction resistance.

[0066] In one extended embodiment, the inlet and outlet areas of each channel can be achieved by setting a gradient section or a stepped section on the lower air guide plate 20, and the direction of the guide ribs 21 can be adjusted accordingly according to the area ratio requirements.

[0067] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the area of ​​the air inlet channel 30 gradually decreases from the air intake 30a side to the first fan 60 side. This design causes the cross-sectional area of ​​the air inlet channel 30 to gradually decrease along the airflow direction.

[0068] Because the first fan 60 generates a suction negative pressure at the downstream confluence section of the air inlet channel 30, the airflow is drawn in from the upstream air inlets 30a and converges towards the first fan 60. As the airflow converges, the total flow rate increases along the path. If the channel cross-sectional area remains unchanged, the increase in flow velocity is limited and eddies are easily generated.

[0069] Therefore, by gradually shrinking the channel area along the flow direction, the rate of decrease in the channel cross-sectional area matches the increase in flow rate after the airflow merges, keeping the flow velocity of each section within a reasonable range, reducing local resistance loss and vortex loss caused by abrupt changes in cross-section, and improving the effective suction efficiency of the first fan 60.

[0070] In one extended embodiment, the area reduction of the air inlet channel 30 can be achieved by linear or non-linear gradual change, and the specific reduction curve can be optimized based on the performance curve of the first fan 60 and the channel resistance characteristics.

[0071] Please combine Figure 4 as well as Figure 5As shown, in some embodiments, the width of the air inlet channel 30 gradually narrows from the air intake 30a side to the first fan 60 side. This narrowing can be achieved by gradually reducing the distance between the two side walls of the lower guide plate 20 along the flow direction.

[0072] Width contraction is a specific implementation of area contraction. By gradually narrowing the width, airflow is guided to converge evenly from a wider inlet area to a narrower downstream area, reducing airflow separation and vortex phenomena caused by abrupt changes in the channel cross-section. Gradual width contraction makes the airflow streamline smoother, improves the airflow organization inside the air inlet channel 30, and helps to further improve the uniformity of the air intake volume of each air inlet 30a.

[0073] Furthermore, in some embodiments, the height of the air inlet channel 30 from the air intake 30a side to the first fan 60 side remains constant. That is, the distance between the two side walls of the lower air guide plate 20 gradually decreases along the airflow direction, achieving a contraction in the width direction; at the same time, the top wall of the lower air guide plate 20 and the lower wall of the upper mounting plate 10 remain parallel and equidistant, achieving a constant height direction.

[0074] From a fluid dynamics perspective, the cross-sectional area of ​​a channel is equal to the product of its width and height. Under the condition of constant height, the rate of change of the cross-sectional area depends only on the rate of change of the width, making the variation of airflow velocity along the flow path directly correspond to the variation of width. This single-dimensional control avoids the additional increase in flow path resistance that may be caused by height contraction, and also makes the cross-sectional ratio design of each sub-channel (first channel 22, second channel 23, third channel 24) more intuitive. The required area ratio relationship (A32 / A31 > A22 / A21 > A12 / A11) can be achieved simply by adjusting the width distribution between each guide rib 21.

[0075] From a manufacturing perspective, the constant height ensures that the lower air guide plate 20 and the upper mounting plate 10 are parallel planes. After assembly, they naturally form a channel with a constant height, eliminating the need for additional sealing or height adjustment structures, thus simplifying the product structure and manufacturing process. Furthermore, the constant height ensures that the height of each guide rib 21 is uniform and stable, and the airflow separation gap formed between the guide rib 21 and the corresponding wall surface is constant, avoiding the problem of local failure of the guide rib 21 or airflow short circuit due to height changes.

[0076] In one extended embodiment, width reduction can be combined with height variation, i.e., the width and height of the air intake duct 30 change simultaneously to achieve the desired area reduction, or area reduction can be achieved solely through height variation.

[0077] This embodiment also provides a cooking device, including a cooking chamber 2, a door 1, and a heat dissipation structure as described in any of the above embodiments. The door 1 is closable and installed on the front side of the cooking chamber 2, and the upper mounting plate 10 is fixed to the top of the cooking chamber 2. The door 1 has a heat dissipation channel that extends through the interior of the door 1 along its thickness direction, for guiding heat from inside the door 1 to dissipate outward.

[0078] When the door 1 is closed, the air outlet of the door's heat dissipation channel faces the air intake 30a on the lower air guide plate 20, forming a direct airflow path between them. At this time, hot air inside the door 1 can be drawn directly from the air outlet of the door's heat dissipation channel into the air intake 30a by the suction of the first fan 60, entering the air intake channel 30 to participate in the heat dissipation cycle. This direct alignment ensures smooth airflow between the door's heat dissipation channel and the air intake channel 30, reducing airflow deflection and leakage losses, and improving the overall efficiency of the door's heat dissipation.

[0079] In one extended embodiment, the cooking equipment can be a steam oven, a microwave steam oven, a steam oven, etc., and the installation method can be built-in or countertop, etc. The size and arrangement of the heat dissipation structure can be adapted to the specific specifications of the equipment.

[0080] The aforementioned cooking equipment can be controlled via a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses these commands. Based on the parsed commands, the controller directs the cooking equipment to perform corresponding operations, thereby achieving intelligent control of the cooking equipment and improving the user experience.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0082] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A heat dissipation structure, characterized in that, include: Upper mounting plate (10); The lower air guide plate (20) is located below the upper mounting plate (10) and forms an air inlet channel (30) with the lower wall of the upper mounting plate (10). The air inlet channel (30) has an air intake (30a) facing the air outlet of the door (1). An upper air guide plate (40) is disposed above the upper mounting plate (10) and forms a first external exhaust channel (50) with the upper wall of the upper mounting plate (10). The first external exhaust channel (50) has a first exhaust port (51). The first fan (60) is installed on the upper mounting plate (10). The air inlet channel (30) and the first exhaust channel (50) are connected through the first fan (60). The first fan (60) is configured to drive air from the air inlet of the door body (1) through the air inlet (30a) into the air inlet channel (30), and then through the first fan (60) into the first exhaust channel (50) before being discharged from the first exhaust port (51). The upper air guide plate (40) and the upper wall of the upper mounting plate (10) also form a second external exhaust channel (70), and the first external exhaust channel (50) and the second external exhaust channel (70) are independent of each other; The heat dissipation structure also includes a second fan (80) disposed on the upper mounting plate (10) and connected to the second exhaust channel (70). The second exhaust channel (70) also has a second exhaust vent (71) opened side by side with the first exhaust vent (51) in the width direction. The second exhaust channel (70) is connected to the cooking box (2) and is used for exhausting steam.

2. The heat dissipation structure according to claim 1, characterized in that, The heat dissipation structure also includes a water tank (90) disposed above the upper mounting plate (10), and the first external discharge channel (50) is located between the second external discharge channel (70) and the water tank (90).

3. The heat dissipation structure according to claim 1, characterized in that, The area A1 of the first exhaust vent (51) and the area A2 of the second exhaust vent (71) satisfy: 1.2A1≤A2≤2.5A1.

4. The heat dissipation structure according to claim 1, characterized in that, The first fan (60) is offset on one side of the upper mounting plate (10) along the width direction, and the second fan (80) is offset on the other side of the upper mounting plate (10) along the width direction.

5. The heat dissipation structure according to claim 4, characterized in that, The inner wall of the lower air guide plate (20) and / or the bottom wall of the upper mounting plate (10) are provided with guide ribs (21) along the airflow direction. The guide ribs (21) divide the air inlet channel (30) along the width direction of the upper mounting plate (10) from the side where the first fan (60) is located to the side where the second fan (80) is located into a first channel (31), a second channel (32) and a third channel (33).

6. The heat dissipation structure according to claim 5, characterized in that, The air inlet channel (30) satisfies: A32 / A31 > A22 / A21 > A12 / A11; where A32 is the inlet area of ​​the third channel (33), A31 is the outlet area of ​​the third channel (33), A22 is the inlet area of ​​the second channel (32), A21 is the outlet area of ​​the second channel (32), A12 is the inlet area of ​​the first channel (31), and A11 is the outlet area of ​​the first channel (31).

7. The heat dissipation structure according to claim 5, characterized in that, The air inlet channel (30) gradually narrows in area from the air intake (30a) side to the first fan (60) side.

8. The heat dissipation structure according to claim 7, characterized in that, The width of the air inlet channel (30) gradually narrows from the side of the air inlet (30a) to the side of the first fan (60).

9. The heat dissipation structure according to claim 8, characterized in that, The height of the air inlet channel (30) from the air intake (30a) side to the first fan (60) side remains unchanged.

10. A cooking device, characterized in that, The appliance includes a cooking box (2), a door (1), and a heat dissipation structure as described in any one of claims 1 to 9. The door (1) is closable and can be installed on the cooking box (2). The upper mounting plate (10) is fixed to the top of the cooking box (2). The door (1) has a heat dissipation channel inside. When the door (1) is closed, the air outlet of the heat dissipation channel is directly opposite the air intake (30a).

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