Exhaust duct of oven and oven

Abstract

The invention relates to the technical field of ovens, in particular to an exhaust pipeline of an oven and the oven, and aims to solve the problem that an existing oven is poor in heat dissipation effect. In order to achieve the purpose, the exhaust pipeline of the oven comprises a reducing pipe section, and the sectional area of the reducing pipe section is gradually reduced in the direction from the air inlet end to the exhaust end. On the basis of the fluid mechanics principle, a variable-diameter pipe section is designed in an exhaust pipeline, the sectional area of the variable-diameter pipe section is gradually reduced in the direction from the air inlet end to the exhaust end, a gradually-shrunk channel can be formed through the design, airflow acceleration is promoted, and the negative pressure effect is improved. When the sectional area is reduced, the flow speed is increased, so that the hot air flow in the pipeline can be discharged out of the exhaust pipeline more quickly, and the exhaust efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ovens, and in particular provides an exhaust duct of an oven and an oven. Background Art

[0002] With the development of science and technology, people's demand for cooking food is increasing day by day. In order to make food more fragrant and delicious, people usually use ovens to cook. Ovens usually use fan components to discharge the heat inside the oven to the outside through exhaust ducts to achieve heat dissipation of the oven. Therefore, the design of the exhaust duct is one of the important elements that directly affects the heat dissipation effect of the oven.

[0003] The air duct should have the function of guiding the airflow. The airflow in the air duct takes away the heat transferred from the surrounding of the air duct during the exhaust process to achieve the purpose of heat dissipation. The curved surface shape in the air duct directly affects the speed and size of the airflow. If the design is unreasonable, it may also cause backflow. In some related technologies, due to the limitation of the installation space, the exhaust duct design of the oven is relatively simple. Generally, the exhaust duct is designed as a straight cylindrical structure. The exhaust speed and exhaust air volume of such an air duct are relatively small, and the heat dissipation of the oven is relatively slow. If the heat generated by the baking oven cannot be dissipated in time, it may cause the heat generated inside the oven to be greater than the heat outside the oven, causing damage to the internal components of the oven. In severe cases, the oven may explode.

[0004] Accordingly, the art needs a new oven heat dissipation solution to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing oven has poor heat dissipation effect.

[0006] In a first aspect, the present invention provides an exhaust duct of an oven, which has an air inlet end and an air exhaust end, and the exhaust duct comprises:

[0007] A reducing pipe section, wherein the cross-sectional area of ​​the reducing pipe section gradually decreases along the direction from the air inlet end to the air outlet end.

[0008] Optionally, the reducing pipe section includes a first inner surface and a second inner surface that are relatively arranged, the first inner surface is a straight surface that extends in the direction from the air inlet end to the exhaust end, and the second inner surface includes a first curved surface and a second curved surface that are sequentially connected in the direction from the air inlet end to the exhaust end, the concave surface of the first curved surface faces the inner side of the exhaust duct, and the convex surface of the second curved surface faces the inner side of the exhaust duct.

[0009] Optionally, the reducer pipe section further includes a transition surface connected between the first arcuate surface and the second arcuate surface, and the transition surface is tangent to the first arcuate surface and the second arcuate surface respectively.

[0010] Optionally, the reducing pipe section has a first end and a second end, the cross-sectional area of ​​the first end is greater than the cross-sectional area of ​​the second end, and the exhaust duct further includes:

[0011] A straight pipe section is connected to the second end of the reducing pipe section, and the inner surface of the straight pipe section is tangent to the second arc-shaped surface.

[0012] Optionally, the straight pipe section includes a third inner surface and a fourth inner surface that are arranged opposite to each other, the third inner surface and the fourth inner surface are parallel to each other, and the third inner surface is tangent to the second arc-shaped surface.

[0013] Optionally, a curvature of the first arcuate surface is smaller than a curvature of the second arcuate surface.

[0014] In a second aspect, the present invention provides an oven, comprising:

[0015] Box;

[0016] A fan is arranged in the box, and the fan has an input end and an output end;

[0017] The exhaust duct as described in any one of the first aspects, wherein the exhaust duct is arranged in the box body, and the air inlet end of the exhaust duct is connected to the output end of the fan;

[0018] an air inlet duct, which is disposed in the box and communicated with the input end of the fan, the air inlet duct and the exhaust duct are located on the same side of the fan, and an accommodating space is formed between the air inlet duct and the exhaust duct;

[0019] The water tank assembly is arranged in the accommodating space.

[0020] Optionally, it also includes:

[0021] The condensation plate is arranged in the air inlet duct and close to the air inlet of the air inlet duct.

[0022] Optionally, the water tank assembly includes a water tank body and a cover plate connected to the water tank body, the cover plate is arranged at the exhaust end, a first through hole is arranged on the cover plate, and the first through hole is connected to the exhaust end.

[0023] Optionally, the cover plate is further provided with a second through hole, and the second through hole is communicated with the air inlet.

[0024] The above one or more technical solutions of the present invention have at least one or more of the following Beneficial effects:

[0025] In the technical solution of the present invention, based on the principle of fluid mechanics, a variable diameter pipe section is designed in the exhaust duct, and the cross-sectional area of ​​the variable diameter pipe section gradually decreases along the direction from the air inlet end to the exhaust end. This design can form a gradually shrinking channel, promote airflow acceleration, and increase the negative pressure effect. When the cross-sectional area decreases, according to the law of conservation of mass, the fluid must accelerate through a smaller cross-sectional area. This will lead to an increase in flow rate, so that the hot air flow in the pipe is discharged from the exhaust duct faster, thereby improving the exhaust efficiency.

[0026] Other technical effects of the present invention are described in detail in the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a schematic diagram of the structure of an exhaust duct provided by an embodiment of the present invention;

[0029] Figure 2 is a structural schematic diagram of a fan assembly provided by an embodiment of the present invention;

[0030] Figure 3 It is one of the partial structural schematic diagrams of the oven provided by the embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a partial structure of an air inlet duct provided in an embodiment of the present invention;

[0032] Figure 5 This is the second schematic diagram of the partial structure of the oven provided in the embodiment of the present invention. Reference numerals list :

[0033] 1-box body, 2-exhaust duct, 21-air inlet end, 22-exhaust end, 23-reducing pipe section, 231-first inner surface, 232-second inner surface, 2321-first curved surface, 2322-second curved surface, 2323-transition surface, 24-straight pipe section, 241-third inner surface, 242-fourth inner surface, 3-fan, 4-air inlet duct, 41-first air inlet, 42-second air inlet, 43-concave arc groove, 5-condensation plate, 6-water tank assembly, 61-water tank body, 62-cover plate, 621-first through hole, 622-second through hole, 7-inner pot, 71-baking chamber. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0035] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, ordinal numbers such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In some related technologies, the oven usually heats the food in the inner pot assembly through the operation of the heating tube. Since the heating tube radiates heat outward during operation, in order to avoid the temperature of the outer surface of the oven body being too high, the heat dissipation structure of the existing oven is to set a heat dissipation channel between the shell and the inner pot assembly, and open an air inlet on the rear side or upper side of the shell. The heat dissipation fan is used to accelerate the flow of air outside the electric oven and hot air inside the shell. The air flow in the air duct takes away the heat transferred from the surrounding of the air duct during the discharge process, so as to achieve a certain heat dissipation effect.

[0038] Most of the existing heat dissipation ducts of ovens are single-duct structures, that is, only one exhaust duct is designed between the shell and the inner tank assembly, and the heat dissipation of the oven is achieved by extracting hot air from the shell and the baking chamber; and, due to the limitation of installation space, the design of some exhaust ducts is relatively simple, and the general duct structure is a straight-through or relatively simple curved surface design, resulting in a relatively small exhaust speed and exhaust volume, and the heat dissipation efficiency and effect are not ideal.

[0039] Therefore, please refer to Figure 1-5 In the embodiment of the present invention, an exhaust duct for an oven and an oven are provided. First, please refer to Figure 1 The exhaust duct 2 provided in this embodiment is a duct with openings at both ends, and the openings at both ends respectively form an air inlet end 21 and an air outlet end 22 of the exhaust duct 2. The air flow enters the exhaust duct 2 from the air inlet end 21 and is discharged from the duct from the air outlet end 22.

[0040] Based on the principles of fluid mechanics, in the one-dimensional flow of incompressible fluid, the average flow velocity is inversely proportional to the cross-sectional area. It should be noted that the cross-sectional area mentioned in this embodiment refers to the flow cross section, that is, the cross section perpendicular to the flow direction of the airflow.

[0041] The exhaust duct 2 provided in the embodiment of the present invention is based on this principle. Figure 1 and 2 As shown, a reducing pipe section 23 is designed in the exhaust duct 2, and the cross-sectional area of ​​the reducing pipe section 23 gradually decreases along the direction from the air inlet end 21 to the air exhaust end 22. This design can form a gradually shrinking channel, promote airflow acceleration, and increase the negative pressure effect.

[0042] Specifically, when the cross-sectional area decreases, according to the law of conservation of mass, the fluid must accelerate through the smaller cross-sectional area, which will increase the flow velocity, allowing the hot air flow in the duct to be discharged from the exhaust duct 2 faster, thereby improving the exhaust efficiency.

[0043] Furthermore, as the cross-sectional area decreases, the same mass flow will pass through a smaller channel, resulting in a higher velocity and lower pressure. According to Bernoulli's principle, an increase in velocity will result in a decrease in static pressure. This means that a higher negative pressure area will be formed in the reducer section 23, which can further promote the discharge of the hot air flow.

[0044] In an optional embodiment, if Figure 1 As shown, the reducing pipe section 23 includes a first inner surface 231 and a second inner surface 232 which are arranged opposite to each other along the thickness direction of the exhaust duct 2 (which can also be understood as the vertical direction when the exhaust duct 2 is in normal use). The first inner surface 231 is a straight surface, which extends in the direction from the air inlet end 21 to the air outlet end 22 (in this embodiment, this direction is defined as the length direction of the exhaust duct 2). Figure 1 The second inner surface 232 is shown to be an arc-shaped surface.

[0045] Of course, it is not difficult to understand that the exhaust duct 2 also includes a first side surface and a second side surface (not shown in the figure) adjacent to the first inner surface 231 and the second inner surface 232, and the first side surface and the second side surface are arranged opposite to each other, wherein the first inner surface 231, the first side surface, the second inner surface 232 and the second side surface are adjacently arranged in sequence to form the inner contour of the reducing pipe section 23. And in this embodiment, the curved contour of the reducing pipe section 23 is mainly formed by the second inner surface 232.

[0046] Furthermore, the second inner surface 232 includes a first curved surface 2321 and a second curved surface 2322 connected in sequence along the length direction of the air duct, the concave surface of the first curved surface 2321 faces the inner side of the exhaust duct 2, and the convex surface of the second curved surface 2322 faces the inner side of the exhaust duct 2, thereby constructing a trend in which the diameter of the exhaust duct 2 gradually decreases.

[0047] Specifically, if Figure 1 As shown, the first inner surface 231 is a straight surface. When the second inner surface 232 matching it is an arc-shaped surface, the first inner surface 231 is designed as a straight surface. Firstly, it can help the pipeline to achieve smooth airflow, secondly, it can reduce the difficulty of design and processing, and thirdly, it can facilitate the connection with other pipe sections.

[0048] Furthermore, the first arc surface 2321 is an inwardly concave surface, facing the inside of the exhaust duct 2. This design helps to increase the cross-sectional area of ​​the duct, and the second arc surface 2322 is an inwardly convex surface, also facing the inside of the exhaust duct 2, which helps to reduce the cross-sectional area of ​​the duct, so as to achieve a changing trend of gradually reducing the cross-sectional area of ​​the exhaust duct 2.

[0049] The exhaust duct 2 mainly constructs its inner surface contour through two arc-shaped curved surfaces with different concave directions. Compared with the curved surface contour constructed by inclined surfaces with different slopes, the arc-shaped curve can make its internal contour transition smoothly, thereby optimizing air flow and reducing exhaust resistance and turbulence.

[0050] It should be understood that when the cross-sectional area of ​​the pipeline suddenly shrinks, due to inertia, the mainstream is likely to separate from the side wall, forming a vortex zone between the mainstream and the side wall, thereby increasing energy loss. The variable diameter distance will affect the transition of the fluid. The longer the distance, the smoother the transition and the smaller the vortex zone. Therefore, the energy loss of the pipe section can be reduced by increasing the distance of the variable diameter pipe section 23. In this embodiment, a suitable structural form is adopted to make the variable diameter pipe section 23 transition smoothly, thereby improving the local energy loss of the fluid generated by the variable diameter pipe section 23.

[0051] Based on this, in an optional embodiment, a transition surface 2323 is connected between the first arcuate surface 2321 and the second arcuate surface 2322, and the transition surface 2323 is tangent to the first arcuate surface 2321 and the second arcuate surface 2322 respectively.

[0052] Specifically, if Figure 1 As shown, the transition surface 2323 can extend the distance of the reducer pipe section 23, and the distance can be appropriately adjusted according to design requirements.

[0053] Furthermore, the transition surface 2323 is tangently connected to the first curved surface 2321 and the second curved surface 2322 respectively, so as to achieve a smooth transition between the curved surfaces. Such a transition can discretely change the sudden changes in the flow, reduce the generation of vortices, and thereby reduce energy losses, improve the local flow of the fluid through the variable diameter pipe section 23, and help improve the energy performance and efficiency of the exhaust duct 2.

[0054] In an optional embodiment, a structural design is adopted in which the curvature of the first arcuate surface 2321 is smaller than the curvature of the second arcuate surface 2322 .

[0055] Specifically, in the embodiment of the present invention, the curvature radius R1 of the first curved surface 2321 is preferably 60 mm, the curvature radius R2 of the second curved surface 2322 is preferably 80 mm, and the first curved surface 2321 to the second curved surface 2322 are tangently transitioned through the transition surface 2323. According to the theory of strong adverse pressure gradient stratification during the rotation of the wind impeller, the structural continuity tangent transition provided in the embodiment of the present invention is in line with the design of the impeller strong pressure gradient stratification principle.

[0056] In an optional embodiment, the two ends of the variable diameter pipe section 23 are defined as a first end and a second end, respectively, and the cross-sectional area of ​​the first end is greater than the cross-sectional area of ​​the second end. The exhaust duct 2 also includes a straight pipe section 24, which is connected to the second end of the variable diameter pipe section 23, and the inner surface of the straight pipe section 24 is tangent to the second arc surface 2322.

[0057] Furthermore, the straight pipe section 24 includes a third inner surface 241 and a fourth inner surface 242 that are arranged opposite to each other. The third inner surface 241 and the fourth inner surface 242 are parallel to each other. The third inner surface 241 is tangently connected to the second arc surface 2322 , and the fourth inner surface 242 is also tangent to the first inner surface 231 .

[0058] Specifically, if Figure 1 and 2 As shown, a straight pipe section 24 is connected to the second end of the variable diameter pipe section 23, and the inner surface of the straight pipe section 24 is tangent to the second curved surface 2322, so as to achieve a smooth transition between the curved surface and the straight surface inside the pipe. Such a structural form helps to maintain the streamline of the airflow, and makes the velocity direction of the airflow perpendicular to the pipe cross section, thereby reducing turbulence and resistance and improving exhaust efficiency.

[0059] The straight pipe section 24 is the last air outlet pipe section of the exhaust duct 2. The last air outlet pipe section is designed as the straight pipe section 24, and the third inner surface 241 and the fourth inner surface 242 of the straight pipe section 24 are relatively parallel, so that the distance between the two is kept consistent in the entire straight pipe section 24. This can ensure that the airflow remains streamlined in the straight pipe section 24, reduce the flow resistance, and keep the airflow stable in the straight pipe section 24, which helps to maintain a higher airflow velocity and improve the efficiency of the exhaust system.

[0060] Furthermore, due to the existence of the variable diameter pipe section 23, the airflow gradually accelerates from the first end to the second end. When the airflow enters the straight pipe section 24, its speed is already high, and the straight pipe section 24 can quickly bring the airflow out of the exhaust duct 2 while maintaining a high degree of stability.

[0061] In addition, the exhaust vent of a general oven is designed on the front side of the oven, facing the user, and the last air outlet pipe section is designed as a straight pipe section 24, which can also reduce noise. The smooth air flow also helps to improve the user experience of the product.

[0062] In an optional embodiment, the first inner surface 231 of the reducer section 23 is an inclined straight surface, and is inclined upward along the length direction of the exhaust duct 2. Furthermore, the first inner surface 231 and the fourth inner surface 242 are smoothly transitioned tangentially through a small section of circular arc surface to maintain the streamline of the airflow and reduce the flow resistance.

[0063] Such a configuration design makes the diameter of the reducer pipe section 23 increase first and then decrease from the first end to the second end of the reducer pipe section 23. Since the first end is connected to the output end of the fan 3, the pressure at the output end of the fan 3 is relatively large, which, combined with the change in the diameter of the reducer pipe section 23, easily forms a pressure difference in the pipeline, thereby driving the airflow to flow in the pipeline.

[0064] The exhaust duct 2 provided in the embodiment of the present invention may be designed as an integral molding or may be designed as an assembly of an upper shell and a lower shell, which are not limitations of the present invention.

[0065] The embodiment of the present invention further provides an oven, such as Figure 2-5 As shown, it includes a box body 1 and an inner pot 7 installed inside the box body 1. The box body 1 is used to support the overall structure of the oven. A baking cavity 71 is formed in the inner pot 7 for baking food. A space is formed between the inner wall of the box body 1 and the outer wall of the inner pot 7 to form an air flow space, thereby providing conditions for heat dissipation around the inner pot 7.

[0066] A fan 3 assembly is also provided in the box body 1, and the fan 3 assembly is arranged between the box body 1 and the top of the inner pot 7, and is used for heat dissipation after the oven processes food.

[0067] like Figure 2 As shown, the fan 3 assembly includes a fan 3, an air inlet duct 4 connected to the input end of the fan 3, and the exhaust duct 2 as described above connected to the output end of the fan 3. The function of the fan 3 is to promote the transfer of heat through air flow so as to transport the heat to the outside of the box 1. In the embodiment of the present invention, a cross-flow fan 3 is used. Among them, the input end of the fan 3 is located below the output end of the fan 3, the air inlet duct 4 is located below the exhaust duct 2, and the air inlet duct 4 and the exhaust duct 2 are located on the same side of the fan 3, as shown in FIG. Figure 3 As shown, the air inlet duct 4 is arranged close to the inner tank 7.

[0068] Furthermore, if Figure 3As shown, a through hole is provided at the top of the baking cavity 71, and a through hole is also provided at a corresponding position of the air inlet duct 4. The air inlet duct 4 is connected to the baking cavity 71 through the through hole to form a first air inlet channel, so that the hot air in the baking cavity can be introduced into the air inlet duct 4 under the action of the fan 3, and then discharged outside the box body 1 through the exhaust duct 2 to reduce the temperature of the oven.

[0069] As described above, the oven provided in this embodiment has an air inlet duct and an exhaust duct. When the oven dissipates heat after baking, the temperature of the outside air is lower than the temperature inside the box body 1. The fan 3 runs and drives the air around it to circulate, forming a negative pressure at the input end of the fan 3. In this way, the air inlet duct 4 connected to the input end of the fan 3 is in a negative pressure state, and the outside air near the air inlet is sucked into the air inlet duct 4 and mixed with the hot air in the first air inlet channel. The outside air can absorb part of the heat to reduce the total heat of the hot air, and under the driving action of the fan 3, these mixed gases carrying heat are discharged from the box body 1 through the exhaust duct 2.

[0070] Furthermore, if Figure 2 As shown, a condensation plate 5 is provided near the air inlet of the air inlet duct 4. The condensation plate 5 is usually made of a material with good thermal conductivity, such as metal or ceramic. It has a high thermal conductivity and can absorb and conduct heat in the air inlet duct 4, so that the surface temperature of the duct is lower than the dew point temperature, and the moisture is condensed on the condensation plate 5 instead of inside the duct.

[0071] The condensation plate 5 is arranged at a position close to the air inlet of the air inlet duct 4 to maximize the effect of the condensation plate 5. Before the air enters the longer path section of the duct, the condensation plate 5 can play a cooling role and reduce the chance of moisture condensation.

[0072] Furthermore, if Figure 4 As shown, a concave arc groove 43 is provided at the air inlet of the air inlet duct 4 to separate the air inlet into a first air inlet 41 and a second air inlet 42 , and external air enters the air inlet duct 4 through the first air inlet 41 and the second air inlet 42 .

[0073] Furthermore, an accommodation space is formed between the air inlet duct 4 and the air exhaust duct 2. Specifically, Figure 1 and 2 As shown, the reducing pipe section 23 of the exhaust duct 2 gradually decreases toward the side away from the air inlet duct 4 , which provides conditions for forming an accommodating space between the exhaust duct 2 and the air inlet duct 4 .

[0074] A water tank assembly 6 is also provided in the oven. The water tank assembly 6 is arranged in the accommodating space between the air inlet duct 4 and the exhaust duct 2. This can fully utilize the space of the oven on the one hand, and on the other hand, placing the water tank assembly 6 between the air inlet duct 4 and the exhaust duct 2 can provide a certain heat insulation effect.

[0075] The water tank is a key component for producing steam. It heats water and converts it into steam, which is then transported to the steam chamber of the oven through the connected pipes. The steam can provide sufficient heat for steaming and cooking food.

[0076] In an optional embodiment, if Figure 3 and 5 As shown, the water tank assembly 6 includes a water tank body 61 and a cover plate 62 connected to the water tank body 61, and the cover plate 62 is used to cover the opening of the water tank body 61. Specifically, the water tank body 61 is arranged in the accommodation space formed between the air inlet duct 4 and the exhaust duct 2, the cover plate 62 is arranged at the exhaust end 22, and a first through hole 621 is arranged on the cover plate 62, and the first through hole 621 is communicated with the exhaust end 22.

[0077] Furthermore, the cover plate 62 is also provided with a second through hole 622, and the second through hole 622 is communicated with the air inlet. In this way, external air can also enter the air inlet duct 4 through the second through hole 622, and then be discharged through the exhaust duct 2.

[0078] Since the installation space in the oven is limited, the accommodating space between the air inlet duct 4 and the exhaust duct 2 is fully utilized, and the water tank assembly 6 is arranged in the accommodating space, thereby avoiding additional occupation of space in other parts and effectively improving space utilization efficiency.

[0079] Furthermore, since the oven generates a large amount of heat energy during operation and is discharged through the exhaust duct 2, by arranging the water tank assembly 6 in the accommodation space between the air inlet duct 4 and the exhaust duct 2, the contact area between the water tank and the exhaust duct 2 can be increased, thereby improving the heat transfer efficiency. A portion of the waste heat can be recovered into the water tank for heating water or other heat recovery applications, thereby improving energy utilization efficiency.

[0080] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An exhaust duct of an oven, comprising an air inlet end and an air exhaust end, characterized in that: The exhaust duct comprises: A reducing pipe section, wherein the cross-sectional area of ​​the reducing pipe section gradually decreases along the direction from the air inlet end to the air outlet end.

2. The exhaust duct of the oven according to claim 1, characterized in that: The reducing pipe section includes a first inner surface and a second inner surface that are relatively arranged, the first inner surface is a straight surface, which extends in the direction from the air inlet end to the air exhaust end, and the second inner surface includes a first arcuate surface and a second arcuate surface that are sequentially connected in the direction from the air inlet end to the air exhaust end, the concave surface of the first arcuate surface faces the inner side of the exhaust duct, and the convex surface of the second arcuate surface faces the inner side of the exhaust duct.

3. The exhaust duct of the oven according to claim 2, characterized in that: The reducer pipe section further includes a transition surface connected between the first arcuate surface and the second arcuate surface, and the transition surface is tangent to the first arcuate surface and the second arcuate surface respectively.

4. The exhaust duct of the oven according to claim 3, characterized in that: The variable diameter pipe section has a first end and a second end, the cross-sectional area of ​​the first end is greater than the cross-sectional area of ​​the second end, and the exhaust duct further includes: A straight pipe section is connected to the second end of the reducing pipe section, and the inner surface of the straight pipe section is tangent to the second arc-shaped surface.

5. The exhaust duct of the oven according to claim 4, characterized in that: The straight pipe section includes a third inner surface and a fourth inner surface that are arranged opposite to each other. The third inner surface and the fourth inner surface are parallel to each other, and the third inner surface is tangent to the second arc-shaped surface.

6. The exhaust duct of the oven according to claim 2, characterized in that: The curvature of the first arcuate surface is smaller than the curvature of the second arcuate surface.

7. An oven, characterized in that: include: Box; A fan is arranged in the box, and the fan has an input end and an output end; The exhaust duct according to any one of claims 1 to 6, wherein the exhaust duct is arranged in the box body, and the air inlet end of the exhaust duct is connected to the output end of the fan; an air inlet duct, which is disposed in the box and communicated with the input end of the fan, the air inlet duct and the exhaust duct are located on the same side of the fan, and an accommodating space is formed between the air inlet duct and the exhaust duct; The water tank assembly is arranged in the accommodating space.

8. The oven according to claim 7, characterized in that: Also includes: The condensation plate is arranged in the air inlet duct and close to the air inlet of the air inlet duct.

9. The oven according to claim 7, characterized in that: The water tank assembly includes a water tank body and a cover plate connected to the water tank body, the cover plate is arranged on the exhaust end, a first through hole is arranged on the cover plate, and the first through hole is communicated with the exhaust end.

10. The oven according to claim 9, characterized in that: The cover plate is also provided with a second through hole, and the second through hole is communicated with the air inlet.

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