An air outlet cover, a fan system and an oil fume treatment device

Abstract

The utility model relates to kitchen appliance technical field especially, relate to an air outlet cover, fan system and oil fume treatment device. In the air outlet cover, fan system and oil fume treatment device, volute includes air inlet and air outlet, air outlet cover installs in air outlet, air inlet has the first longitudinal central section along the first direction extension, air outlet has the second longitudinal central section along the first direction extension, and the second longitudinal central section is arranged along the second direction interval with the first longitudinal central section, and the air outlet cover includes fluid export, and fluid export is oval and includes the first end and second end along the second direction arrangement, and the curvature radius of the outer contour curve of first end is greater than the curvature radius of the outer contour curve of second end. The fluid export of this modeling makes the flow rate of fluid of fluid export whole section relatively uniform, effectively improves the oil fume treatment device's oil fume effect, significantly improves the exhaust efficiency of oil fume treatment device, avoids the diffusion of oil fume to the outside when cooking.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to an exhaust hood, a fan system, and an oil fume treatment device. Background Technology

[0002] like Figure 1 As shown, due to the shape limitations of the volute 21 itself, the air inlet 211 has a first longitudinal central section 2111 extending in the front-back direction, and the air outlet 212 has a second longitudinal central section 2121 extending in the front-back direction. The second longitudinal central section 2121 and the first longitudinal central section 2111 are arranged alternately from right to left. When the impeller 22 is driven to rotate by the motor, the gas at the air inlet 211 is drawn into the airflow by the negative pressure generated by the impeller 22. The airflow is then thrown along the inner wall of the volute 21 by the rotation of the blades of the impeller 22.

[0003] Taking the clockwise rotation of impeller 22 as an example, since the second longitudinal center section 2121 and the first longitudinal center section 2111 are arranged alternately from right to left, the space inside the volute 21 gradually increases from left to right. The amount of airflow also increases as the impeller 22 throws air from left to right. Since the airflow is centrifugally thrown out by the blades along the tangent of the arc, the airflow will have centrifugal force. This causes the airflow velocity at the fluid outlet 2311 of the air outlet hood 23 to be higher on the right side and lower on the left side, resulting in the fluid outlet 2311... The uneven flow velocity of the fluid across the entire cross section 311 will cause eddies or resistance to be generated in the airflow inside the volute 21 and the exhaust hood 23, making it impossible to form a stable and efficient airflow channel. As a result, some of the fumes can be discharged smoothly, while others may linger in the fume treatment device 100 or even flow back into the kitchen, resulting in a significant decrease in the fume extraction effect of the fume treatment device 100 and a reduction in the exhaust efficiency of the fume treatment device 100. Consequently, the "suction" of the fume treatment device 100 is not as strong as before, and fumes are more likely to spread when cooking.

[0004] Therefore, there is an urgent need to design a new exhaust hood, fan system, and fume treatment device to solve the problems of significantly reduced fume extraction efficiency, reduced smoke exhaust efficiency, and easy diffusion of fumes during cooking. Utility Model Content

[0005] One objective of this invention is to provide an exhaust hood that can balance the flow velocity of the fluid on the left and right sides of the fluid outlet, making the flow velocity of the fluid across the entire cross-section of the fluid outlet relatively uniform. This reduces the eddies or resistance generated by the airflow inside the volute and exhaust hood, thereby forming a relatively stable and efficient airflow channel. This ensures that most of the oil fumes can be smoothly discharged, preventing oil fumes from lingering in the oil fume treatment device or even flowing back into the kitchen. This effectively improves the oil fume extraction effect of the oil fume treatment device, significantly improves the exhaust efficiency of the oil fume treatment device, and prevents oil fumes from spreading outwards during cooking.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An air outlet shroud cooperates with a volute housing, the volute housing including an air inlet and an air outlet, the air outlet shroud being installed on the air outlet, the air inlet having a first longitudinal central cross-section extending along a first direction, the air outlet having a second longitudinal central cross-section extending along the first direction, the second longitudinal central cross-section and the first longitudinal central cross-section being spaced apart along a second direction, the first direction being different from the second direction, the air outlet shroud comprising:

[0008] The fluid outlet is oval-shaped and includes a first end and a second end arranged along the second direction, wherein the radius of curvature of the outer contour curve of the first end is greater than the radius of curvature of the outer contour curve of the second end.

[0009] As an optional solution, the outer contour curve of the fluid outlet is obtained according to the following formula:

[0010] Formula 1: x(θ) = a × cos(θ);

[0011] Formula 2: y(θ)=b×sin(θ)×[1+k×cos(θ)];

[0012] Where x(θ) is the abscissa of the outer contour curve of the fluid outlet, y(θ) is the ordinate of the outer contour curve of the fluid outlet, the direction from the second longitudinal center section to the first longitudinal center section in the second direction is the same as the positive direction of the abscissa axis, the volute has an air inlet longitudinal section and a motor side longitudinal section extending along the second direction and spaced apart along the first direction, the direction from the air inlet longitudinal section to the motor side longitudinal section in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet, b is the y-axis reference radius of the outer contour curve of the fluid outlet, and k is a deformation coefficient.

[0013] As an optional solution, the outer contour curve of the fluid outlet is obtained according to the following formula:

[0014] Formula 3: x(θ) = a × cos(θ);

[0015] Formula 4: y(θ)=[b×sin(θ)+d×cos(θ)]×[1+k×cos(θ)];

[0016] Where x(θ) is the abscissa of the outer contour curve of the fluid outlet, y(θ) is the ordinate of the outer contour curve of the fluid outlet, the direction from the second longitudinal center section to the first longitudinal center section in the second direction is the same as the positive direction of the abscissa axis, the volute has an air inlet longitudinal section and a motor side longitudinal section extending along the second direction and spaced apart along the first direction, the direction from the air inlet longitudinal section to the motor side longitudinal section in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet, b is the y-axis reference radius of the outer contour curve of the fluid outlet, and k is a deformation coefficient.

[0017] As an optional solution, the outer contour curve of the fluid outlet is obtained according to the following formula:

[0018] Formula 5: x(θ) = a × cos(θ);

[0019] Formula 6: y(θ)=[b×sin(θ)+d×cos(θ)]×[1+k×cos(θ)+m×sin(θ)];

[0020] Where x(θ) is the abscissa of the outer contour curve of the fluid outlet, y(θ) is the ordinate of the outer contour curve of the fluid outlet, the direction from the second longitudinal center section to the first longitudinal center section in the second direction is the same as the positive direction of the abscissa axis, the volute has an air inlet longitudinal section and a motor side longitudinal section extending along the second direction and spaced apart along the first direction, the direction from the air inlet longitudinal section to the motor side longitudinal section in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet, b is the y-axis reference radius of the outer contour curve of the fluid outlet, and k is a deformation coefficient.

[0021] The two objectives of this utility model are to provide a fan system that can balance the flow velocity of the fluid on the left and right sides of the fluid outlet, making the flow velocity of the fluid across the entire cross-section of the fluid outlet relatively uniform. This reduces the eddies or resistance generated by the airflow inside the volute and the exhaust hood, thereby forming a relatively stable and efficient airflow channel. This ensures that most of the oil fumes can be discharged smoothly, preventing oil fumes from lingering in the oil fume treatment device or even flowing back into the kitchen. This effectively improves the oil fume extraction effect of the oil fume treatment device, significantly improves the exhaust efficiency of the oil fume treatment device, and prevents oil fumes from spreading outwards during cooking.

[0022] To achieve this objective, the present invention adopts the following technical solution:

[0023] A fan system includes a volute, the volute including an air inlet and an air outlet, the air inlet having a first longitudinal central section extending along a first direction, the air outlet having a second longitudinal central section extending along the first direction, the second longitudinal central section and the first longitudinal central section being arranged at intervals along a preset direction, the fan system further including an air outlet shroud as described above, the air outlet shroud being installed on the air outlet.

[0024] As an optional solution, the wind turbine system further includes:

[0025] The adapter pipe includes an adapter pipe inlet and an adapter pipe outlet. The adapter pipe inlet is connected to and adapted to the fluid outlet. The adapter pipe outlet is circular. From the adapter pipe inlet to the adapter pipe, the outer contour shape of the cross-section of the adapter pipe gradually transitions from an oval shape to a circle.

[0026] As an optional solution, the height H of the adapter pipe along the vertical direction is greater than or equal to 50mm and less than or equal to 200mm.

[0027] As an optional solution, one of the air outlet hood and the adapter pipe is provided with a plug-in slot, and the other of the two is plugged into the plug-in slot; and / or

[0028] The fan system further includes a first fixing component, which securely connects the adapter pipe to the outdoor duct; and / or

[0029] The fan system also includes a second fixing component, which fixes the air outlet shroud to the adapter pipe.

[0030] As an optional solution, the air hood further includes a fluid inlet, which is connected to and communicates with the air outlet. In a longitudinal section extending along the second direction, the tangent at the air outlet is collinear with the tangent at the fluid inlet.

[0031] The three objectives of this utility model are to provide an oil fume treatment device that can balance the flow velocity of the fluid on the left and right sides of the fluid outlet, making the flow velocity of the fluid across the entire cross-section of the fluid outlet relatively uniform, reducing the eddies or resistance generated by the airflow inside the volute and the exhaust hood, thereby forming a relatively stable and efficient airflow channel, ensuring that most of the oil fumes can be smoothly discharged, preventing oil fumes from lingering inside the oil fume treatment device or even flowing back into the kitchen, effectively improving the oil fume extraction effect of the oil fume treatment device, significantly improving the exhaust efficiency of the oil fume treatment device, and preventing the oil fumes from spreading outwards during cooking.

[0032] To achieve this objective, the present invention adopts the following technical solution:

[0033] An oil fume treatment device includes a housing, and the oil fume treatment device further includes an exhaust hood as described above and / or a fan system as described above.

[0034] The beneficial effects of this utility model are:

[0035] The air outlet shroud provided by this utility model can be matched with a volute. The volute includes an air inlet and an air outlet. The air outlet shroud is installed on the air outlet. The air inlet has a first longitudinal central section extending along a first direction, and the air outlet has a second longitudinal central section extending along the first direction. The second longitudinal central section and the first longitudinal central section are arranged at intervals along the second direction. The first direction and the second direction are different. The air outlet shroud includes a fluid outlet. The fluid outlet is oval and includes a first end and a second end arranged along the second direction. The radius of curvature of the outer contour curve of the first end is greater than the radius of curvature of the outer contour curve of the second end.

[0036] Compared to a circular fluid outlet, this design reduces the fluid velocity on the right side of the outlet while increasing the velocity on the left side. This balances the fluid velocities on both sides of the outlet, resulting in a more uniform fluid velocity across the entire cross-section. This reduces eddies or resistance generated within the volute and exhaust hood, creating a relatively stable and efficient airflow channel. This ensures that most of the fumes are successfully exhausted, preventing them from lingering inside the fume treatment device or even flowing back into the kitchen. This effectively improves the fume extraction efficiency of the device, significantly enhancing its exhaust efficiency and ensuring consistently strong suction, thus preventing the fumes from spreading outwards during cooking.

[0037] In addition, because the fluid velocity across the entire cross-section of the fluid outlet is relatively uniform, the fan system can avoid violent vibrations and abnormal wind noise. Users will not hear much louder "buzzing" or "rumbling" sounds or harsh wind noise than usual, ensuring a better cooking experience.

[0038] Furthermore, because the fluid velocity across the entire cross-section of the fluid outlet is relatively uniform due to this design, the balance and uniformity of the impeller rotation can be guaranteed. The motor will not be subjected to additional uneven loads, and the motor does not need to output more torque to maintain rotation. It will not be under overload for a long time, thus avoiding problems such as motor overheating and accelerated aging, preventing motor burnout, reducing wear on the fan system, and improving the service life of the fan system.

[0039] Furthermore, because the fluid velocity across the entire cross-section of the fluid outlet is relatively uniform due to this design, vibrations in the fan system or fume treatment device can be avoided. This prevents vibrations at every fixed point of the fume treatment device caused by continuous and severe vibrations, thus avoiding problems such as loose screws, housing resonance, internal component displacement or damage, and ensuring a longer lifespan for the fume treatment device. In addition, it avoids the risk of parts falling off due to vibration, ensuring the normal operation of the fume treatment device and guaranteeing the personal safety of the user.

[0040] Furthermore, since the fluid outlet is oval-shaped and includes a first end and a second end, with the first end and the second end arranged alternately from right to left, compared to a circular fluid outlet, the fluid outlet of this embodiment has a relatively small size in the front-back direction. The size of the fluid outlet in the front-back direction of this oval shape can be less than or equal to the thickness of the housing itself, which can prevent the main unit from protruding from the housing in the front-back direction. The overall appearance of the fume treatment device is more attractive, effectively improving the user experience.

[0041] The fan system provided by this utility model includes a volute, which includes an air inlet and an air outlet. The air inlet has a first longitudinal central section extending along a first direction, and the air outlet has a second longitudinal central section extending along the first direction. The second longitudinal central section and the first longitudinal central section are arranged at intervals along a predetermined direction. The fan system further includes an air outlet hood, which is installed at the air outlet. This ensures that the fluid velocity across the entire cross-section of the fluid outlet is relatively uniform, reducing eddies or resistance generated inside the volute and air outlet hood, thus forming a relatively stable and efficient airflow channel. This ensures that most of the oil fumes can be smoothly discharged, preventing oil fumes from lingering in the fume treatment device or even flowing back into the kitchen. This effectively improves the fume extraction effect of the fume treatment device, significantly improves the exhaust efficiency of the fume treatment device, and ensures that the fume treatment device always has good suction power, preventing the diffusion of oil fumes outwards during cooking.

[0042] The oil fume treatment device provided by this utility model includes a housing, and further includes the aforementioned exhaust hood and / or the aforementioned fan system. This ensures a relatively uniform fluid velocity across the entire cross-section of the fluid outlet, reducing eddies or resistance generated within the volute and exhaust hood, thus forming a relatively stable and efficient airflow channel. This guarantees that most of the oil fumes can be smoothly discharged, preventing them from lingering within the device or even flowing back into the kitchen. This effectively improves the fume extraction efficiency and ensures consistently good suction power, preventing the spread of oil fumes during cooking.

[0043] The fan system provided by this utility model also includes a transfer pipe, which includes a transfer pipe inlet and a transfer pipe outlet. The transfer pipe inlet is connected to and adapted to the fluid outlet. The transfer pipe outlet is circular and connected to the inlet of the outdoor pipe. The size and shape of the transfer pipe outlet are the same as those of the inlet of the outdoor pipe. From the transfer pipe inlet to the transfer pipe, the outer contour of the cross-section of the transfer pipe gradually transitions from an oval shape to a circle. Through this design and structure of the transfer pipe, on the one hand, the transfer pipe can be quickly, conveniently, and accurately connected to the fluid outlet; on the other hand, the transfer pipe can also be quickly, conveniently, and accurately connected to the inlet of the outdoor pipe. Therefore, gaps between the transfer pipe and the fluid outlet, and between the transfer pipe and the inlet of the outdoor pipe, can be avoided. This prevents fluid leakage between the transfer pipe and the fluid outlet and the inlet of the outdoor pipe, ensuring a good fume extraction effect of the fume treatment device, effectively improving the fume exhaust efficiency of the fume treatment device, ensuring a good "suction" of the fume treatment device, and preventing the diffusion of fumes during cooking.

[0044] Furthermore, by extending the transition from the inlet to the outer contour of the adapter pipe, the cross-sectional shape gradually transitions from an oval to a circular shape. This allows for a smooth transition of fluid from the exhaust hood to the outdoor duct. Through viscous shearing within the adapter pipe, the fluid's kinetic energy is redistributed, preventing turbulence and eliminating disturbances within the outdoor duct. This ensures a uniform flow velocity distribution within the outdoor duct, reducing noise and improving the user experience. Additionally, the adapter pipe design minimizes velocity loss caused by uneven fluid velocity distribution within the outdoor duct, ensuring consistently effective fume extraction. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the existing technology and the oil fume treatment device provided in Embodiment 1 of this utility model;

[0046] Figure 2This is a cross-sectional view of the fume treatment device provided in Embodiment 1 of this utility model;

[0047] Figure 3 This is a schematic diagram of the first structure of the air outlet hood provided in Embodiment 1 of this utility model;

[0048] Figure 4 This is a schematic diagram of the second structure of the air outlet hood provided in Embodiment 1 of this utility model;

[0049] Figure 5 These are exploded views of the fume treatment device and outdoor pipeline provided in Embodiments 1 and 2 of this utility model;

[0050] Figure 6 This is a side view of an existing fume treatment device;

[0051] Figure 7 This is a side view of the fume treatment device provided in Embodiment 1 of this utility model;

[0052] Figure 8 These are schematic diagrams of two oval-shaped fluid outlets provided in Embodiment 1 of this utility model;

[0053] Figure 9 This is a simulation diagram of the fluid velocity in an existing oil fume treatment device that uses a circular fluid outlet.

[0054] Figure 10 This is a simulation diagram of the fluid velocity of the fume treatment device using an oval fluid outlet provided in Embodiment 1 of this utility model.

[0055] Figure 11 This is a cross-sectional view of the air outlet cover, adapter pipe, and outdoor pipe provided in Embodiment 2 of this utility model in the assembled state;

[0056] Figure 12 This is a schematic diagram of the first structure of the volute and impeller provided in Embodiment 3 of this utility model;

[0057] Figure 13 This is a schematic diagram of the second structure of the volute and impeller provided in Embodiment 3 of this utility model;

[0058] Figure 14 This is a simulation diagram of the fluid velocity in the longitudinal section of the air inlet side of the fan system with the external contour shape of the fluid outlet constructed using Formula 1 and Formula 2, which is involved in Embodiment 1, Embodiment 3 and Embodiment 4 of this utility model.

[0059] Figure 15 This is a simulation diagram of the fluid velocity in the longitudinal section on the motor side of the fan system with the external contour shape of the fluid outlet constructed using Formula 1 and Formula 2, which is involved in Embodiments 1, 3 and 4 of this utility model.

[0060] Figure 16 This is a schematic diagram of the external contour shape of the fluid outlet constructed with Formula 1 and Formula 2 and the external contour shape of the fluid outlet constructed with Formula 3 and Formula 4, provided in Embodiment 3 of this utility model.

[0061] Figure 17 This is a schematic diagram of the external contour shape of the fluid outlet constructed with Formula 1 and Formula 2 and the external contour shape of the fluid outlet constructed with Formula 5 and Formula 6, provided in Embodiment 4 of this utility model.

[0062] Figure 18 This is a simulation diagram of the fluid velocity in the longitudinal section of the air inlet side of the fan system with the external contour shape of the fluid outlet constructed using formulas 5 and 6, provided in Embodiment 4 of this utility model.

[0063] Figure 19 This is a simulation diagram of the fluid velocity in the longitudinal section on the motor side of the fan system with the external contour shape of the fluid outlet constructed using formulas 5 and 6, provided in Embodiment 4 of this utility model.

[0064] In the picture:

[0065] 100. Fume treatment device; 200. Outdoor ductwork;

[0066] 10. Housing; 11. Baffle; 111. Air inlet; 112. Baffle body; 113. First side plate; 13. Housing body; 15. Mixing chamber;

[0067] 20. Fan system; 21. Volute; 211. Air inlet; 2111. First longitudinal center section; 212. Air outlet; 2121. Second longitudinal center section; 213. Inlet side longitudinal section; 214. Motor side longitudinal section; 22. Impeller; 23. Air outlet shroud; 231. Cover; 2311. Fluid outlet; 2311a. First fluid outlet shape; 2311b. Second fluid outlet shape; 2311c. Third fluid outlet shape; 23111. First end; 23112. Second end; 2312. Fluid inlet; 232. Flange; 233. Insertion groove; 234. Reinforcing rib; 24. Adapter pipe; 241. Adapter pipe inlet; 242. Adapter pipe outlet; 25. First fixing component; 251. Adhesive tape; 252. First fastener; 26. Second fixing component;

[0068] 50. Main unit case;

[0069] 90. Smoke collection assembly; 91. Smoke collection plate; 92. Second side plate; 93. Flip plate. Detailed Implementation

[0070] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0071] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0072] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0073] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0074] Example 1

[0075] like Figure 1 As shown, this utility model embodiment provides an oil fume treatment device 100, which includes a housing 10 and a fan system 20. The housing 10 has an air inlet 111, and at least part of the fan system 20 is disposed inside the housing 10 and has an air inlet 211 and an air outlet 212. The air inlet 111, the air inlet 211 and the air outlet 212 are arranged along the direction of gas flow. When the fan system 20 is working, the fan system 20 can generate a negative pressure inside the housing 10. Oil fumes outside the oil fume treatment device 100 can enter the fan system 20 for filtration after passing through the air inlet 111 and the air inlet 211. The filtered gas is discharged to an outdoor duct (not shown in the figure) from the air outlet 212.

[0076] It should be noted that the fume treatment device 100 in this embodiment can be a side-draft range hood, a top-mounted range hood, a European-style range hood, an integrated stove, etc. All devices capable of treating fumes are within the protection scope of this optional embodiment.

[0077] like Figure 1 As shown, the air inlet 211 can be an elongated opening extending from right to left (i.e., the second direction), thereby ensuring a large negative pressure at the air inlet 211, allowing external fumes to enter the housing 10. It should be noted that the left and right directions in this embodiment are defined with reference to the fume treatment device 100 itself.

[0078] like Figure 1 As shown, the fan system 20 of this embodiment can be a centrifugal fan system. The centrifugal fan system includes a volute 21 and an impeller 22 rotatably disposed inside it. The volute 21 has an air inlet 211 and an air outlet 212. When the impeller 22 rotates, a vacuum is formed inside the volute 21, so that the oil fumes enter from the air inlet 211. The oil fumes achieve gas-liquid separation inside the volute 21 due to centrifugal action, thereby realizing the filtering function of the fan system 20 for oil fumes.

[0079] like Figure 1 As shown, the fan system 20 also includes an exhaust hood 23, which is connected to the air outlet 212 and to an outdoor duct (not shown in the figure). The function of the exhaust hood 23 is to prevent backflow of oil fumes, ensure a better environment in the kitchen, and reduce the smell of oil fumes in the kitchen.

[0080] like Figure 1 As shown, the fume treatment device 100 also includes a main unit box 50, which is covered outside the exhaust hood 23 to ensure the overall aesthetics of the fume treatment device 100.

[0081] In an alternative embodiment, such as Figure 3 As shown, the fume treatment device 100 also includes a fume collection component 90, which can open or block the air inlet 111. When the fume collection component 90 opens the air inlet 111, it can effectively collect the fumes, thereby achieving a better fume extraction effect for the fume treatment device 100.

[0082] In an alternative embodiment, such as Figure 1 and Figure 5As shown, the fume treatment device 100 also includes a linear drive mechanism (not shown in the figure). The housing 10 includes a housing body 13 and a baffle 11 with an air inlet 111. The smoke collection assembly 90 is rotatably connected to the housing body 13 and located above the baffle 11. The upper end of the baffle 11 is slidably connected to the smoke collection assembly 90, and the lower end of the smoke collection assembly 90 is rotatably connected to the housing body 13. One end of the linear drive mechanism is rotatably connected to the housing body 13, and the other end of the linear drive mechanism is rotatably connected to the smoke collection assembly 90. When the linear drive mechanism is in the unfolded state, the smoke collection assembly 90 flips forward and drives the baffle 11 to flip forward. The fan system 20, the smoke collection assembly 90, and the baffle 11 together form a mixing cavity 15, which increases the distance between the air inlet 111 and the air inlet 211, allowing the fumes to redistribute their kinetic energy through viscous shearing action, eliminating airflow disturbance at the air inlet 211, and making the left and right inflow velocities of the air inlet 211 tend to be the same.

[0083] In an alternative embodiment, such as Figure 3 and Figure 8 As shown, the smoke collection assembly 90 includes a smoke collection plate 91 and a second side plate 92. The smoke collection plate 91 is provided with a second side plate 92 on both the left and right sides. The baffle 11 includes a baffle body 112 and a first side plate 113. The baffle body 112 is provided with a first side plate 113 on both the left and right sides. The air inlet 111 is provided on the baffle body 112. When the smoke collection assembly 90 and the baffle 11 are both in the forward-flipped state, the smoke collection plate 91, the second side plate 92, the baffle body 112 and the first side plate 113 together form a relatively sealed mixing cavity 15, which allows the oil fumes to better redistribute kinetic energy through viscous shearing action, better eliminates airflow disturbance at the air inlet 211, and better makes the left and right inflow velocities of the air inlet 211 tend to be the same.

[0084] In an alternative embodiment, such as Figure 1 and Figure 5 As shown, a flip-up flap 93 is rotatably mounted at the lower end of the smoke-collecting plate 91. By adjusting the flip angle of the flap 93, a good smoke-collecting effect can be achieved for oil fumes in different states. Specifically, a drive device can also be provided to realize the rotation of the flap 93 relative to the smoke-collecting plate 91. For example, the drive device can be a linear motor, with one end of the linear motor rotatably connected to the smoke-collecting plate 91 and the other end of the linear motor rotatably connected to the flap 93. Of course, the drive device can also be a rotary motor, with the rotating shaft of the rotary motor fixedly connected to the rotating shaft of the flap 93.

[0085] In an alternative embodiment, such as Figure 1 and Figure 2As shown, due to the shape limitations of the volute 21 itself, the air inlet 211 has a first longitudinal central section 2111 extending in the front-to-back direction (i.e., the first direction), and the air outlet 212 has a second longitudinal central section 2121 extending in the front-to-back direction. The second longitudinal central section 2121 and the first longitudinal central section 2111 are arranged alternately from right to left. When the impeller 22 is driven to rotate by the motor (not shown in the figure), the gas at the air inlet 211 is drawn into the airflow by the negative pressure generated by the impeller 22, and the airflow is thrown along the inner wall of the volute 21 by the rotation of the blades of the impeller 22. Figure 1 As shown, taking the clockwise rotation of impeller 22 as an example, since the second longitudinal center section 2121 and the first longitudinal center section 2111 are arranged alternately from right to left, the space inside the volute 21 gradually increases from left to right. The amount of airflow also increases as the impeller 22 throws air from left to right. Since the airflow is centrifugally thrown out by the blades along the tangential direction of the arc, the airflow will have centrifugal force. This causes the airflow velocity near the right side of the fluid outlet 2311 of the air outlet hood 23 to be higher and the airflow velocity near the left side to be lower, resulting in the fluid outlet... The uneven flow velocity of the fluid across the entire cross section 2311 will cause the airflow to easily generate eddies or resistance inside the volute 21 and the exhaust hood 23, making it impossible to form a stable and efficient airflow channel. As a result, some of the fumes can be discharged smoothly, while others may linger inside the fume treatment device 100 or even flow back into the kitchen, causing a significant decrease in the fume extraction effect of the fume treatment device 100 and a reduction in the exhaust efficiency of the fume treatment device 100. Consequently, the "suction" of the fume treatment device 100 is not as strong as before, and fumes are more likely to spread when cooking.

[0086] In addition, the uneven flow velocity of the fluid across the entire cross-section of the fluid outlet 2311 will also cause the fan system 20 to generate severe vibration and abnormal wind noise. Users will hear a much louder "humming" sound, "rumbling" sound or harsh wind noise than usual, which will seriously affect the user's cooking experience.

[0087] Furthermore, the uneven flow velocity of the fluid across the entire cross-section of the fluid outlet 2311 will also cause uneven rotation of the impeller 22, which is equivalent to adding an extra and uneven burden to the motor. The motor will need to output more torque to maintain rotation, and will be in an overloaded state for a long time, leading to motor overheating, accelerated aging, and eventually possible motor burnout, which will aggravate the wear of the fan system 20 and shorten the service life of the fan system 20.

[0088] Furthermore, the uneven flow velocity of the fluid across the entire cross-section of the fluid outlet 2311 will cause vibration in the fan system 20 and even the fume treatment device 100. Continuous and severe vibration will be transmitted to every fixed point of the fume treatment device 100, which may cause screws to loosen, resonance of the housing 10, displacement or damage of internal parts. This "internal injury" will greatly shorten the normal life of the fume treatment device 100. In addition, the risk of parts falling off due to vibration is very dangerous once it occurs, affecting the normal use of the fume treatment device 100, and in severe cases, it may affect the personal safety of users.

[0089] In addition, such as Figure 6 As shown, the shape and volume of the housing 10 of the current fume treatment device 100 tend to be smaller and thinner, which is more acceptable to users. This results in freeing up user operating space and kitchen cabinet space. However, since the air volume of the current fume treatment device 100 is relatively large, the diameter p of the fluid outlet 2311 of the exhaust hood 23 is also relatively large. Most of the fluid outlets 2311 of the exhaust hood 23 of the existing fume treatment device 100 are circular. The diameter p of the conventional circular fluid outlet 2311 will exceed the thickness t of the housing 10 itself. This results in a large thickness n of the main unit 50 in the front-to-back direction. The main unit 50 will protrude from the housing 10 in the front-to-back direction, making the appearance of the fume treatment device 100 unsightly and unacceptable to users.

[0090] To solve the above problems, such as Figure 3 and Figure 4 As shown, the air outlet hood 23 includes a fluid outlet 2311, which is oval-shaped and includes a first end 23111 and a second end 23112. The first end 23111 and the second end 23112 are arranged alternately from right to left. The radius of curvature of the outer contour curve of the first end 23111 is greater than the radius of curvature of the outer contour curve of the second end 23112. Compared with a circular fluid outlet 2311, the fluid velocity on the right side of the fluid outlet 2311 in this embodiment decreases, while the fluid velocity on the left side increases, thereby achieving a balance between the left and right sides of the fluid outlet 2311. The effect of fluid flow rate makes the fluid velocity of the fluid outlet 2311 relatively uniform across the entire cross section, reducing the eddies or resistance generated by the airflow inside the volute 21 and the exhaust hood 23, so as to form a relatively stable and efficient airflow channel, ensuring that most of the oil fumes can be discharged smoothly, preventing oil fumes from lingering in the oil fume treatment device 100 or even flowing back into the kitchen, effectively improving the oil fume treatment device 100's oil fume extraction effect, significantly improving the oil fume treatment device 100's exhaust efficiency, ensuring that the oil fume treatment device 100 always has good "suction power", and preventing oil fumes from spreading outwards while cooking.

[0091] Furthermore, since the fluid velocity across the entire cross-section of the fluid outlet 2311, which is designed according to the present disclosure embodiment, is relatively uniform, it can also prevent the fan system 20 from generating severe vibrations and abnormal wind noise. Users will not hear a "buzzing" sound, "rumbling" sound, or harsh wind noise that is much louder than usual, thus ensuring a better cooking experience for users.

[0092] Furthermore, since the fluid velocity across the entire cross-section of the fluid outlet 2311 with the design of this embodiment is relatively uniform, the balance and uniformity of the impeller 22 rotation can be guaranteed. The motor will not be subjected to additional uneven loads, the motor does not need to output more torque to maintain rotation, and it will not be in an overload state for a long time. This avoids problems such as motor overheating and accelerated aging, prevents motor burnout, reduces wear on the fan system 20, and improves the service life of the fan system 20.

[0093] Furthermore, since the fluid velocity across the entire cross-section of the fluid outlet 2311, designed according to this embodiment, is relatively uniform, vibrations in the fan system 20 or the fume treatment device 100 can be avoided. This prevents vibrations at every fixed point of the fume treatment device 100 due to continuous and severe vibrations, thus avoiding problems such as loose screws, resonance of the housing 10, displacement or damage of internal parts, and ensuring a longer lifespan for the fume treatment device 100. In addition, it also avoids the risk of parts falling off due to vibration, ensuring the normal operation of the fume treatment device 100 and guaranteeing the personal safety of the user.

[0094] In addition, such as Figure 7 As shown, since the fluid outlet 2311 is oval and includes a first end 23111 and a second end 23112, with the first end 23111 and the second end 23112 arranged alternately from right to left, compared to the circular fluid outlet 2311, the dimension p' of the fluid outlet 2311 in the front-back direction of this embodiment is relatively small. The dimension p' of the fluid outlet 2311 in the front-back direction of this oval shape can be less than or equal to the thickness t of the housing 10 itself, which can prevent the main unit 50 from protruding from the housing 10 in the front-back direction. The overall appearance of the fume treatment device 100 is more attractive, effectively improving the user experience.

[0095] In an alternative embodiment, such as Figure 3 As shown, the outer contour curve of fluid outlet 2311 is obtained according to the following formula:

[0096] Formula 1: x(θ) = a × cos(θ);

[0097] Formula 2: y(θ)=b×sin(θ)×[1+k×cos(θ)];

[0098] Where x(θ) is the abscissa of the outer contour curve of the fluid outlet 2311, y(θ) is the ordinate of the outer contour curve of the fluid outlet 2311, the direction from the second longitudinal center section (2121) to the first longitudinal center section (2111) in the second direction is the same as the positive direction of the abscissa axis, the volute (21) has an air inlet side longitudinal section (213) extending along the second direction and spaced along the first direction and a motor side longitudinal section (214), the direction from the air inlet side longitudinal section (213) to the motor side longitudinal section (213) in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet 2311, b is the y-axis reference radius of the outer contour curve of the fluid outlet 2311, and k is a deformation coefficient.

[0099] The outer contour of the fluid outlet 2311 obtained by the above formula is an oval shape that is larger on the right and smaller on the left. By applying this formula, a fluid outlet 2311 with a relatively uniform fluid velocity across the entire cross-section can be quickly obtained, thereby achieving the effect of balancing the fluid velocity on the left and right sides of the fluid outlet 2311. This makes the fluid velocity across the entire cross-section of the fluid outlet 2311 relatively uniform, reducing the eddies or resistance generated by the airflow inside the volute 21 and the exhaust hood 23, thus forming a relatively stable and efficient airflow channel. This ensures that most of the oil fumes can be discharged smoothly, preventing oil fumes from lingering in the oil fume treatment device 100 or even flowing back into the kitchen. This effectively improves the oil fume extraction effect of the oil fume treatment device 100, significantly improves the smoke exhaust efficiency of the oil fume treatment device 100, and ensures that the oil fume treatment device 100 always has good suction power, preventing oil fumes from spreading outwards during cooking.

[0100] It should be noted that, as Figure 3 and Figure 7 As shown, b needs to be determined based on the thickness t of the housing 10 itself, that is, 2×b is less than or equal to the thickness t of the housing 10 itself. This is to ensure that the thickness n of the main unit 50 in the front-back direction does not exceed the thickness t of the housing 10 itself, so that the main unit 50 will not protrude from the housing 10 in the front-back direction.

[0101] Since the diameter of the conventional outdoor pipe 200 is relatively fixed and universal, in order to match the existing outdoor pipe 200, the perimeter of the oval fluid outlet 2311 must match the perimeter S of the outdoor pipe 200, thereby obtaining the x-axis reference radius a of the outer contour curve of the fluid outlet 2311. Formulas 1 and 2 obtained through the above method ensure a good and tight connection between the outdoor pipe 200 and the fluid outlet 2311, avoiding excessive gaps between them that could lead to oil fume leakage, and ensuring a good oil fume extraction effect of the oil fume treatment device 100. For ease of calculation, the perimeter of the oval fluid outlet 2311 can be replaced by an ellipse calculation formula with the same a and b, enabling rapid acquisition of the x-axis reference radius a of the outer contour curve of the fluid outlet 2311.

[0102] It should be noted that by substituting the previously obtained 'a' and 'b' into Formulas 1 and 2, and by substituting different deformation coefficients 'k' into Formulas 1 and 2, and by using drawing software to draw different formulas, the range of |k| can be obtained through drawing multiple sets of parameters. When |k| is between 0.05 and 0.3, Formulas 1 and 2 can be used to obtain an oval-shaped fluid outlet 2311 with a radius of curvature greater than that of the outer contour curve of the first end 23111. Furthermore, the drawing shows that within the aforementioned range, as |k| increases, the radius of curvature of the outer contour curve of the first end 23111 increases, while the radius of curvature of the outer contour curve of the second end 23112 decreases. Therefore, as the non-uniformity of the fluid velocity across the entire cross-section of the fluid outlet 2311 increases, |k| is increased to ensure that the designed shape of the fluid outlet 2311 better matches the fluid distribution in the actual application scenario.

[0103] It should be noted that θ is an angular variable, that is, the angle between the line connecting any point on the oval fluid outlet 2311 and the origin of the coordinate system and the x-axis, where the value of θ ranges from 0° to 360°.

[0104] To better illustrate the effects of the oval-shaped fluid outlet 2311, Figure 9 Simulation diagram of fluid distribution at the circular fluid outlet 2311 and Figure 10 By comparing the simulated fluid distribution diagram of the oval-shaped fluid outlet 2311 shown, it can be clearly seen that... Figure 9 The fluid velocity on the right side of the circular fluid outlet 2311 shown is significantly faster than that on the left side, while... Figure 10 The oval-shaped fluid outlet 2311 shown tends to be uniform from left to right. Figure 10 The non-uniformity of the fluid velocity at the oval-shaped fluid outlet 2311 shown is much smaller than that of the fluid outlet 2311. Figure 9The degree of non-uniformity of the fluid velocity at the circular fluid outlet 2311 shown indicates that by setting the fluid outlet 2311 as... Figure 10 The oval shape, with the larger right side and smaller left side, significantly improves the unevenness of the fluid velocity at the fluid outlet 2311, thereby balancing the fluid velocity on the left and right sides of the fluid outlet 2311. This makes the fluid velocity across the entire cross-section of the fluid outlet 2311 relatively uniform, reducing eddies or resistance generated inside the volute 21 and the exhaust hood 23. This creates a relatively stable and efficient airflow channel, ensuring that most of the fumes can be smoothly discharged, preventing fumes from lingering inside the fume treatment device 100 or even flowing back into the kitchen. This effectively improves the fume extraction effect of the fume treatment device 100, significantly increases the exhaust efficiency of the fume treatment device 100, and ensures that the fume treatment device 100 always has good suction power, preventing the fumes from spreading outwards while cooking.

[0105] In an alternative embodiment, such as Figures 2-5 As shown, the exhaust hood 23 also includes a flange 232, which is fixedly connected to the hood body 231. The flange 232 abuts against and is fixed to the surface of the housing 10, thereby achieving a stable connection between the exhaust hood 23 and the housing 10. This prevents leakage of oil fumes inside the fume treatment device 100 due to gaps between the exhaust hood 23 and the housing 10, ensuring that the fume treatment device 100 always has a good fume extraction effect. For example, the flange 232 and the housing 10 can be fixedly connected by means such as pins, screws, or snap-fit ​​components, thereby achieving a stable connection between the exhaust hood 23 and the housing 10.

[0106] In an alternative embodiment, such as Figures 2-5 As shown, the air outlet hood 23 also includes reinforcing ribs 234, which are fixedly connected to the flange 232 and the hood body 231 respectively. By setting the reinforcing ribs 234, the strength and stability of the connection between the flange 232 and the hood body 231 can be effectively enhanced, and the breakage at the connection between the flange 232 and the hood body 231 can be avoided, ensuring that the air outlet hood 23 has good overall strength, hardness and service life.

[0107] Example 2

[0108] The fan system 20 and the fume treatment device 100 provided in this embodiment can use the exhaust hood 23 provided in Embodiment 1, or they can use an exhaust hood 23 not provided in Embodiment 1.

[0109] It should be noted that some exhaust hoods 23, in order to reduce their dimensions in the front-to-back direction, design the fluid outlet 2311 of the exhaust hood 23 in an oval shape, a smaller ellipse in the front-to-back direction, or a smaller rectangle, as in Embodiment 1. However, the cross-section of the conventional outdoor duct 200 is usually circular, and the diameter of the outdoor duct 200 is relatively fixed and universal. This can lead to the problem that the fluid outlet 2311 is not easy to connect with the inlet of the outdoor duct 200, resulting in gaps at the connection point between the fluid outlet 2311 and the inlet of the outdoor duct 200. This causes air leakage at the connection point between the fluid outlet 2311 and the inlet of the outdoor duct 200, resulting in a significant decrease in the fume extraction effect of the fume treatment device 100, a reduction in the exhaust efficiency of the fume treatment device 100, and a decrease in the "suction power" of the fume treatment device 100 compared to before, making it easier for fumes to spread when cooking.

[0110] Furthermore, the outlet of the outdoor pipe 200 is circular. Even though the outdoor pipe 200 itself is a deformable structure, and its inlet can be forcibly adapted to the shape of the fluid outlet 2311 by changing its shape, the overall distortion of the shape of the outdoor pipe 200 will cause turbulence and disturbance within the outdoor pipe 200, resulting in high noise levels inside the outdoor pipe 200. This significant noise will then be transmitted through various channels, such as... Figure 1 The air inlet 111 shown transmits air to the user, thus affecting the user's experience. In addition, due to the uneven flow velocity distribution of the fluid inside the outdoor duct 200, there is a significant loss of flow velocity, which weakens the fume extraction effect of the fume treatment device 100.

[0111] To solve the above problems, such as Figure 5 and Figure 11As shown, the fan system 20 of this embodiment further includes a transfer pipe 24, which includes a transfer pipe inlet 241 and a transfer pipe outlet 242. The transfer pipe inlet 241 is connected to the fluid outlet 2311 and has the same size and shape as the fluid outlet 2311. The transfer pipe outlet 242 is circular and is connected to the inlet of the outdoor pipe 200. The transfer pipe outlet 242 is adapted to the outdoor pipe 200, that is, the shape of the transfer pipe outlet 242 is the same as the shape of the outdoor pipe 200. From the transfer pipe inlet 241 to the transfer pipe 24, the outer contour shape of the cross-section of the transfer pipe 24 gradually transitions from oval to circular. Through this shape and structure of the transfer pipe 24, a On the one hand, the adapter pipe 24 can be quickly, conveniently, and accurately connected to the fluid outlet 2311. On the other hand, the adapter pipe 24 can also be quickly, conveniently, and accurately connected to the inlet of the outdoor pipe 200. Therefore, it can avoid gaps between the adapter pipe 24 and the fluid outlet 2311, and also avoid gaps between the adapter pipe 24 and the inlet of the outdoor pipe 200. It can prevent fluid leakage between the adapter pipe 24 and the fluid outlet 2311 and the inlet of the outdoor pipe 200, ensuring a good oil fume extraction effect of the fume treatment device 100, effectively improving the smoke exhaust efficiency of the fume treatment device 100, ensuring a good "suction" of the fume treatment device 100, and preventing the spread of oil fumes during cooking.

[0112] In addition, such as Figure 5 and Figure 11 As shown, from the inlet 241 to the outlet 242 of the transfer pipe 24, the outer contour of the cross-section of the transfer pipe 24 gradually transitions from an oval shape to a circle. The transfer pipe 24 enables a smooth transition of fluid from the exhaust hood 23 to the outdoor duct 200. Through viscous shearing action inside the transfer pipe 24, the fluid redistributes its kinetic energy, preventing turbulence and eliminating disturbances within the outdoor duct 200. This achieves a uniform distribution of fluid velocity within the outdoor duct 200, reducing noise and improving the user experience. Furthermore, the transfer pipe 24 also reduces velocity loss caused by uneven fluid velocity distribution within the outdoor duct 200, minimizing velocity loss and ensuring consistently good fume extraction performance of the fume treatment device 100.

[0113] In an alternative embodiment, such as Figure 11As shown, the height H of the adapter pipe 24 in the vertical direction is greater than or equal to 50mm and less than or equal to 200mm. Utilizing this height, the adapter pipe 24 provides sufficient length to allow the fluid to redistribute its kinetic energy through viscous shearing, thus preventing fluid turbulence and eliminating disturbances within the outdoor pipe 200. This achieves a uniform distribution of fluid velocity within the outdoor pipe 200, reducing noise and improving the user experience. Furthermore, the sufficient length of the adapter pipe 24 to allow for kinetic energy redistribution through viscous shearing also reduces velocity loss caused by uneven velocity distribution within the outdoor pipe 200, minimizing velocity loss and ensuring consistently good fume extraction performance of the fume treatment device 100.

[0114] In an alternative embodiment, such as Figure 11 As shown, the air outlet cover 23 is provided with a plug groove 233, and the adapter pipe 24 is plugged into the plug groove 233, which effectively improves the quick and accurate docking of the air outlet cover 23 and the adapter pipe 24, and effectively improves the docking installation accuracy and efficiency of the air outlet cover 23 and the adapter pipe 24.

[0115] Of course, in other alternative embodiments, the insertion slot 233 can be disposed on the adapter pipe 24, and the air outlet hood 23 can be inserted into the insertion slot 233, which can also achieve the above effect.

[0116] In an alternative embodiment, such as Figure 11 As shown, the fan system 20 also includes a first fixing component 25, which fixes the outdoor pipe 200 to the transfer pipe 24, thereby enabling a stable connection between the outdoor pipe 200 and the transfer pipe 24.

[0117] In an alternative embodiment, such as Figure 5 and Figure 11 As shown, the first fixing component 25 may include tape 251, which is placed around the outer periphery of the connection position between the outdoor pipe 200 and the adapter pipe 24, and the tape 251 is respectively attached to the outdoor pipe 200 and the adapter pipe 24, thereby achieving a stable connection between the outdoor pipe 200 and the adapter pipe 24 and preventing fluid leakage from the gap between the outdoor pipe 200 and the adapter pipe 24.

[0118] In an alternative embodiment, such as Figure 11As shown, the first fixing component 25 may further include a first fixing member 252, which passes through the outdoor pipe 200 and the adapter pipe 24, thereby achieving a secure connection between the outdoor pipe 200 and the adapter pipe 24 and preventing fluid leakage from the gap between the outdoor pipe 200 and the adapter pipe 24. For example, the first fixing member 252 may be a screw, pin, snap-fit ​​assembly, etc., and all first fixing members 252 capable of achieving a secure connection between the outdoor pipe 200 and the adapter pipe 24 are within the protection scope of this optional embodiment.

[0119] In an alternative embodiment, such as Figure 11 As shown, the fan system 20 also includes a second fixing component 26, which securely connects the air outlet shroud 23 to the adapter pipe 24, thereby achieving a stable connection between the air outlet shroud 23 and the adapter pipe 24. For example, the second fixing component 26 can be a screw, pin, clip, etc., and all second fixing components 26 capable of achieving a stable connection between the outdoor duct 200 and the adapter pipe 24 are within the protection scope of this optional embodiment.

[0120] In an optional embodiment, the exhaust hood 23 further includes a fluid inlet 2312, which is connected to and communicates with the air outlet 212. In a longitudinal section extending in the left-right direction, the tangent at the air outlet 212 is collinear with the tangent at the fluid inlet 2312, which enables the fluid in the volute 21 to flow smoothly out to the exhaust hood 23, reduces the wind resistance during the flow of fluid from the volute 21 to the exhaust hood 23, minimizes the flow rate loss, ensures that the fume treatment device 100 always has a good fume extraction effect, and reduces the noise of the fume treatment device 100 during use.

[0121] Example 3

[0122] The fan system 20 and the fume treatment device 100 provided in this embodiment can be further improved on the structure of the exhaust hood 23 provided in Embodiment 1, and can also be further improved on the structure of the exhaust hood 23 of the fume treatment device 100 in Embodiment 2.

[0123] like Figure 12 and Figure 13 As shown, the volute 21 of this embodiment has an air inlet longitudinal section 213 and a motor side longitudinal section 214. The air inlet longitudinal section 213 is located at the air inlet 111, and the motor side longitudinal section 214 is located on the back side of the volute 21. The fluid outlets 2311 are located at X1 and Y1 where they intersect in the air inlet longitudinal section 213, and at X2 and Y2 where they intersect in the motor side longitudinal section 214.

[0124] like Figure 14 and Figure 15 As shown, Figure 14This is a simulation diagram of the fluid velocity in the longitudinal section 213 on the air inlet side of the fan system 20, which has an external contour shape of the fluid outlet 2311 constructed using Formulas 1 and 2, provided by this optional embodiment. Figure 15 This is a simulation diagram of the fluid flow velocity in the longitudinal section 214 on the motor side of the fan system 20, which uses the external contour shape of the fluid outlet 2311 constructed using Formulas 1 and 2, according to this optional embodiment. The colored scale bars represent the fluid velocity through the fluid outlet 2311, with cool colors representing higher flow velocities than warm colors. In the cool color region, darker colors represent lower flow velocities. In the warm color region, darker colors represent higher flow velocities.

[0125] Through analysis Figures 12-15 It can be seen that the fluid velocity also differs along the front and rear directions, where V Y1 >V Y2 V X2 >V X1 V Y1 Let V be the flow velocity of the fluid at point Y1. Y2 Let V be the flow velocity of the fluid at point Y2. X2 Let V be the flow velocity of the fluid at point X2. X1 Let X1 be the fluid velocity. In order to make the fluid velocity as uniform as possible in the front and back directions, the cross-sectional area of ​​the fluid outlet 2311 corresponding to the area with relatively fast flow velocity needs to be designed to be relatively large, and the cross-sectional area of ​​the fluid outlet 2311 corresponding to the area with slower flow velocity needs to be designed to be relatively small.

[0126] Therefore, the outer contour curve of fluid outlet 2311 can be obtained according to the following formula:

[0127] Formula 3: x(θ) = a × cos(θ);

[0128] Formula 4: y(θ)=[b×sin(θ)+d×cos(θ)]×[1+k×cos(θ)];

[0129] Where x(θ) is the abscissa of the outer contour curve of the fluid outlet 2311, y(θ) is the ordinate of the outer contour curve of the fluid outlet 2311, the direction from the second longitudinal center section (2121) to the first longitudinal center section (2111) in the second direction is the same as the positive direction of the abscissa axis, the volute (21) has an air inlet side longitudinal section (213) extending along the second direction and spaced along the first direction and a motor side longitudinal section (214), the direction from the air inlet side longitudinal section (213) to the motor side longitudinal section (213) in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet 2311, b is the y-axis reference radius of the outer contour curve of the fluid outlet 2311, and k is a deformation coefficient.

[0130] Definition: such as Figure 16 As shown, in the second direction, the direction from the second longitudinal center section 2121 to the first longitudinal center section 2111 is the same as the positive direction of the horizontal axis. In the first direction, the direction from the air inlet side longitudinal section 213 to the motor side longitudinal section 214 is the same as the positive direction of the vertical axis. The horizontal axis and the vertical axis divide the first fluid outlet 231 into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant. The first quadrant is formed by the positive directions of the intersecting horizontal axis and the vertical axis. The first quadrant, the second quadrant, the third quadrant, and the fourth quadrant are arranged clockwise.

[0131] like Figure 16 As shown, the first fluid outlet shape 2311a is the shape composed of formulas 1 and 2, and the second fluid outlet shape 2311b is the shape composed of formulas 3 and 4. Since V X2 >V X1 Therefore, it is necessary to reduce the area of ​​the second quadrant and increase the area of ​​the first quadrant to achieve the desired effect for V. X2 The improvement and V X1 This reduces the velocity, thereby ensuring a uniform distribution of the fluid velocity at the second end 23112 along the front-to-back direction. Due to V Y1 >V Y2 Therefore, it is necessary to reduce the area of ​​the fourth quadrant and increase the area of ​​the third quadrant to achieve the desired effect for V. Y2 The improvement and V Y1 This reduces the uniformity of the fluid velocity distribution at the first end 23111 along the front-to-back direction. Therefore, by introducing a longitudinal offset coefficient d, the larger d is, the greater the ability to adjust the non-uniformity of the fluid velocity at the fluid outlet 2311 along the front-to-back direction.

[0132] By introducing the relevant formula for the longitudinal offset coefficient d, i.e., d×cos(θ), the area of ​​the second quadrant can be reduced while the area of ​​the first quadrant can be increased, thereby achieving a certain effect on V. X2 The improvement and V X1 This reduces the velocity, thereby ensuring a more uniform distribution of the fluid velocity at the second end 23112 along the front-to-back direction. Simultaneously, it reduces the area of ​​the fourth quadrant and increases the area of ​​the third quadrant, thus enabling the reduction of V... Y2 Increase and V Y1 This reduces the velocity of the fluid at the first end 23111, thereby improving the uniformity of the overall velocity of the fluid at the fluid outlet 2311 in the front-back direction.

[0133] By introducing the relevant formula for the deformation coefficient k, namely k×cos(θ), the outer contour of the fluid outlet 2311 is an oval shape with a larger right side and a smaller left side. By applying this formula, a fluid outlet 2311 with a relatively uniform fluid velocity across the entire cross-section can be quickly obtained, thereby achieving the effect of balancing the fluid velocity on the left and right sides of the fluid outlet 2311. This makes the fluid velocity across the entire cross-section of the fluid outlet 2311 relatively uniform, reducing the eddies or resistance generated by the airflow inside the volute 21 and the exhaust hood 23, thus forming a relatively stable and efficient airflow channel. This ensures that most of the oil fumes can be discharged smoothly, preventing oil fumes from lingering in the oil fume treatment device 100 or even flowing back into the kitchen. This effectively improves the oil fume extraction effect of the oil fume treatment device 100, significantly improves the smoke extraction efficiency of the oil fume treatment device 100, and ensures that the oil fume treatment device 100 always has good suction power, preventing the oil fumes from spreading outwards during cooking.

[0134] In summary, by introducing the relevant formulas for the longitudinal offset coefficient d and the deformation coefficient k, the internal parameters of Formula 3 and Formula 4 interact and cooperate with each other, enabling the fluid passing through the outer contour curve of the fluid outlet 2311 constructed by Formula 3 and Formula 4 to have good uniformity in both the front-back direction and the left-right direction.

[0135] In an optional embodiment, when d is greater than or equal to 3 and less than or equal to 8, the outer contour curve of the fluid outlet 2311 obtained by formulas 3 and 4 can better balance the uniformity of the fluid velocity at the fluid outlet 2311 in both the left-right direction and the front-back direction. For example, d can be 3, 4, 5, 6, 7, 8, etc., and all values ​​greater than or equal to 3 and less than or equal to 8 are within the protection scope of this optional embodiment.

[0136] As a preferred option, d can be set to 5. When d is set to 5, the outer contour curve of the fluid outlet 2311 can take into account the uniformity of the fluid velocity in the fluid outlet 2311 in the left-right direction and the uniformity in the front-back direction.

[0137] Example 4

[0138] The fan system 20 and the fume treatment device 100 provided in this embodiment can be further improved on the structure of the exhaust hood 23 provided in Embodiment 1 or Embodiment 3, and can also be further improved on the structure of the exhaust hood 23 of the fume treatment device 100 in Embodiment 2.

[0139] Through analysis Figures 12-15 It can be seen that the fluid velocity also differs along the front and rear directions, where V Y1 >V Y2 V X2 >V X1 V Y1 Let V be the flow velocity of the fluid at point Y1. Y2 Let V be the flow velocity of the fluid at point Y2. X2 Let V be the flow velocity of the fluid at point X2. X1 Let X1 be the fluid velocity. To achieve a relatively uniform fluid velocity along the front-to-back direction, the cross-sectional area of ​​the fluid outlet 2311 corresponding to the region with relatively high flow velocity needs to be designed to be relatively large, while the cross-sectional area of ​​the fluid outlet 2311 corresponding to the region with relatively low flow velocity needs to be designed to be relatively small. Furthermore, through analysis... Figures 12-15 It can be known that V Y1 With V Y2 The difference is small, V X2 With V X1 If the area compensation degree of the first end 23111 along the front-back direction is large, it is still impossible to guarantee the uniformity of the fluid velocity in the fluid outlet 2311 along the front-back direction.

[0140] To solve the above problem, the outer contour curve of fluid outlet 2311 is obtained according to the following formula:

[0141] Formula 5: x(θ) = a × cos(θ);

[0142] Formula 6: y(θ)=[b×sin(θ)+d×cos(θ)]×[1+k×cos(θ)+m×sin(θ)];

[0143] Where x(θ) is the abscissa of the outer contour curve of the fluid outlet 2311, y(θ) is the ordinate of the outer contour curve of the fluid outlet 2311, the direction from the second longitudinal center section (2121) to the first longitudinal center section (2111) in the second direction is the same as the positive direction of the abscissa axis, the volute (21) has an air inlet side longitudinal section (213) extending along the second direction and spaced along the first direction and a motor side longitudinal section (214), the direction from the air inlet side longitudinal section (213) to the motor side longitudinal section (213) in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet 2311, b is the y-axis reference radius of the outer contour curve of the fluid outlet 2311, and k is a deformation coefficient.

[0144] like Figure 17 As shown, the first fluid outlet shape 2311a is the shape formed by formulas 1 and 2, and the third fluid outlet shape 2311c is the shape formed by formulas 5 and 6. Since V X2 >V X1 Therefore, it is necessary to reduce the area of ​​the second quadrant and increase the area of ​​the first quadrant to achieve the desired effect for V. X2 The improvement and V X1 This reduces the velocity, thereby ensuring a uniform distribution of the fluid velocity at the second end 23112 along the front-to-back direction. Due to V Y1 >V Y2 Therefore, it is necessary to reduce the area of ​​the fourth quadrant and increase the area of ​​the third quadrant to achieve the desired effect for V. Y2 The improvement and V Y1 This reduces the velocity of the fluid at the first end 23111, thereby ensuring a more uniform distribution of the fluid velocity along the front-to-back direction. Furthermore, through formulas 5 and 6, the area supplemented by the second quadrant to the first quadrant is significantly greater than the area supplemented by the third quadrant to the fourth quadrant, resulting in better uniformity of the fluid velocity in all directions.

[0145] Based on this, by introducing the relevant formula for the deformation coefficient k, namely k×cos(θ), the outer contour shape of the fluid outlet 2311 is an oval shape with a larger right side and a smaller left side. By applying this formula, a fluid outlet 2311 with a relatively uniform fluid velocity across the entire cross-section can be quickly obtained, thereby achieving the effect of balancing the fluid velocity on the left and right sides of the fluid outlet 2311. This makes the fluid velocity across the entire cross-section of the fluid outlet 2311 relatively uniform, reducing the eddies or resistance generated by the airflow inside the volute 21 and the exhaust hood 23, thus forming a relatively stable and efficient airflow channel. This ensures that most of the oil fumes can be discharged smoothly, preventing oil fumes from lingering in the oil fume treatment device 100 or even flowing back into the kitchen. This effectively improves the oil fume extraction effect of the oil fume treatment device 100, significantly improves the smoke exhaust efficiency of the oil fume treatment device 100, and ensures that the oil fume treatment device 100 always has good "suction power," preventing oil fumes from spreading outwards during cooking.

[0146] By introducing the relevant formula for the longitudinal offset coefficient d, i.e., d×cos(θ), the area of ​​the second quadrant can be reduced while the area of ​​the first quadrant can be increased, thereby achieving a certain effect on V. X2 The improvement and V X1 This reduces the velocity, thereby ensuring a more uniform distribution of the fluid velocity at the second end 23112 along the front-to-back direction. Simultaneously, it reduces the area of ​​the fourth quadrant and increases the area of ​​the third quadrant, thus enabling the reduction of V... Y2 Increase and V Y1 This reduces the velocity of the fluid at the first end 23111, thereby improving the uniformity of the overall velocity of the fluid at the fluid outlet 2311 in the front-back direction.

[0147] Based on this, by introducing a longitudinal asymmetry coefficient *m*, the area supplemented by the second quadrant region to the first quadrant region is much larger than the area supplemented by the third quadrant region to the fourth quadrant region. This allows for targeted and differentiated adjustments to the flow velocities of the first and second ends 23111 and 23112 along the longitudinal direction, respectively, to address the different flow velocity differences at both ends. This ensures a balance in the uniformity of the flow velocity at both ends, resulting in better overall uniformity of the fluid at the outlet 2311. Therefore, the greater the difference in the longitudinal velocity uniformity of the fluid at the outlet 2311 in the left-right direction, the larger *m* needs to be set to achieve better uniformity adjustment of the fluid velocity at the outlet 2311.

[0148] In summary, by introducing formulas for the longitudinal offset coefficient d, the deformation coefficient k, and the longitudinal asymmetry coefficient m, the internal parameters of Formulas 5 and 6 interact and synergize, enabling the fluid passing through the outer contour curve of the fluid outlet 2311 constructed by Formulas 5 and 6 to exhibit better uniformity in both the front-to-back and left-to-right directions. It should be noted that the outer contour curve of the fluid outlet 2311 constructed by Formulas 5 and 6 exhibits better uniformity of fluid velocity in all directions than the outer contour curve of the fluid outlet 2311 constructed by Formulas 3 and 4.

[0149] In an optional embodiment, when m is greater than or equal to 0.03 and less than or equal to 1, the outer contour curve of the fluid outlet 2311 obtained by formulas 5 and 6 can better balance the uniformity of the fluid velocity at the fluid outlet 2311 in both the left-right direction and the front-back direction. For example, d can be 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 1, etc., and all values ​​greater than or equal to 0.03 and less than or equal to 1 are within the protection scope of this optional embodiment.

[0150] As a preferred option, m can be set to 0.05. When m is set to 0.05, the outer contour curve of the fluid outlet 2311 can take into account the uniformity of the fluid velocity in the fluid outlet 2311 in the left-right direction and the uniformity in the front-back direction.

[0151] To better illustrate the effect of the shape of the fluid outlet 2311 constructed using Formulas 5 and 6, Figure 14 The diagram shown illustrates the flow velocity simulation of the fluid in the longitudinal section 213 on the air inlet side of the fan system 20, which uses the external contour of the fluid outlet 2311 constructed using Formulas 1 and 2. Figure 18 The simulation diagrams of the fluid velocity at the inlet side longitudinal section 213 of the fan system 20, which uses the external contour model of the fluid outlet 2311 constructed using Formulas 5 and 6, are compared; Figure 15 The diagram shown illustrates the flow velocity simulation of the fluid in the longitudinal section 214 on the motor side of the fan system 20, which uses the external contour of the fluid outlet 2311 constructed using Formulas 1 and 2. Figure 19 By comparing the simulated flow velocity diagram of the fan system 20 at the motor-side longitudinal section 214 with the external contour shape of the fluid outlet 2311 constructed using Formulas 5 and 6, the following conclusions can be drawn:

[0152] 1) such as Figure 14 and Figure 18As shown, on the longitudinal section 213 on the air inlet side, the fluid in the fluid outlet 2311, which is shaped by the outer contour of the fluid outlet 2311 formed by Formulas 5 and 6, is more uniform in the left and right direction.

[0153] 2) such as Figure 15 and Figure 19 As shown, on the longitudinal section 214 on the motor side, the fluid in the fluid outlet 2311, which is shaped by the outer contour of the fluid outlet 2311 formed by Formulas 5 and 6, is more uniform in the left and right direction.

[0154] 3) such as Figure 14 , Figure 15 , Figure 18 as well as Figure 19 As shown, the fluid passing through the outer contour curve of the fluid outlet 2311 constructed by Formulas 5 and 6 has a better uniformity in the front-to-back direction.

[0155] In summary, combining Figure 14 , Figure 15 , Figure 18 as well as Figure 19 As shown, the outer contour curve of the fluid outlet 2311 constructed using Formulas 5 and 6 exhibits better uniformity of fluid velocity in all directions compared to the outer contour curve of the fluid outlet 2311 constructed using Formulas 1 and 2. This achieves the effect of balancing the fluid velocity in all directions at the fluid outlet 2311, resulting in better uniformity of fluid velocity across the entire cross-section of the fluid outlet 2311. This reduces eddies or resistance generated by the airflow within the volute 21 and the exhaust hood 23, forming a relatively stable and efficient airflow channel. This ensures that most of the fumes are smoothly discharged, preventing fumes from lingering within the fume treatment device 100 or even flowing back into the kitchen. This effectively improves the fume extraction effect of the fume treatment device 100, significantly enhances its exhaust efficiency, and ensures that the fume treatment device 100 maintains good suction power, preventing the fumes from spreading outwards during cooking.

[0156] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An air outlet cover, cooperating with a volute (21), the volute (21) including an air inlet (211) and an air outlet (212), the air outlet cover being installed on the air outlet (212), the air inlet (211) having a first longitudinal central section (2111) extending along a first direction, the air outlet (212) having a second longitudinal central section (2121) extending along the first direction, the second longitudinal central section (2121) and the first longitudinal central section (2111) being arranged at intervals along a second direction, the first direction being different from the second direction, characterized in that, The air outlet shroud includes: The fluid outlet (2311) is oval and includes a first end (23111) and a second end (23112) arranged along the second direction. The radius of curvature of the outer contour curve of the first end (23111) is greater than the radius of curvature of the outer contour curve of the second end (23112).

2. The air outlet hood according to claim 1, characterized in that, The outer contour curve of the fluid outlet (2311) is obtained according to the following formula: Formula 1: x(θ) = a × cos(θ); Formula 2: y(θ)=b×sin(θ)×[1+k×cos(θ)]; Where x(θ) is the abscissa of the outer contour curve of the fluid outlet (2311), y(θ) is the ordinate of the outer contour curve of the fluid outlet (2311), the direction from the second longitudinal center section (2121) to the first longitudinal center section (2111) in the second direction is the same as the positive direction of the abscissa axis, the volute (21) has an air inlet side longitudinal section (213) extending along the second direction and spaced along the first direction and a motor side longitudinal section (214), the direction from the air inlet side longitudinal section (213) to the motor side longitudinal section (214) in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet (2311), b is the y-axis reference radius of the outer contour curve of the fluid outlet (2311), and k is a deformation coefficient.

3. The air outlet hood according to claim 1, characterized in that, The outer contour curve of the fluid outlet (2311) is obtained according to the following formula: Formula 3: x(θ) = a × cos(θ); Formula 4: y(θ)=[b×sin(θ)+d×cos(θ)]×[1+k×cos(θ)]; Where x(θ) is the abscissa of the outer contour curve of the fluid outlet (2311), y(θ) is the ordinate of the outer contour curve of the fluid outlet (2311), the direction from the second longitudinal center section (2121) to the first longitudinal center section (2111) in the second direction is the same as the positive direction of the abscissa axis, the volute (21) has an air inlet side longitudinal section (213) extending along the second direction and spaced along the first direction and a motor side longitudinal section (214), the direction from the air inlet side longitudinal section (213) to the motor side longitudinal section (214) in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet (2311), b is the y-axis reference radius of the outer contour curve of the fluid outlet (2311), and k is a deformation coefficient.

4. The air outlet hood according to claim 1, characterized in that, The outer contour curve of the fluid outlet (2311) is obtained according to the following formula: Formula 5: x(θ) = a × cos(θ); Formula 6: y(θ)=[b×sin(θ)+d×cos(θ)]×[1+k×cos(θ)+m×sin(θ)]; Where x(θ) is the abscissa of the outer contour curve of the fluid outlet (2311), y(θ) is the ordinate of the outer contour curve of the fluid outlet (2311), the direction from the second longitudinal center section (2121) to the first longitudinal center section (2111) in the second direction is the same as the positive direction of the abscissa axis, the volute (21) has an air inlet side longitudinal section (213) extending along the second direction and spaced along the first direction and a motor side longitudinal section (214), the direction from the air inlet side longitudinal section (213) to the motor side longitudinal section (214) in the first direction is the same as the positive direction of the ordinate axis, θ is an angle variable, a is the x-axis reference radius of the outer contour curve of the fluid outlet (2311), b is the y-axis reference radius of the outer contour curve of the fluid outlet (2311), and k is a deformation coefficient.

5. A fan system, comprising a volute (21), the volute (21) including an air inlet (211) and an air outlet (212), the air inlet (211) having a first longitudinal central section (2111) extending along a first direction, the air outlet (212) having a second longitudinal central section (2121) extending along the first direction, the second longitudinal central section (2121) and the first longitudinal central section (2111) being arranged at intervals along a predetermined direction, characterized in that, The fan system further includes an air outlet shroud as described in any one of claims 1 to 4, the air outlet shroud being installed at the air outlet (212).

6. The fan system according to claim 5, characterized in that, The wind turbine system also includes: The adapter pipe (24) includes an adapter pipe inlet (241) and an adapter pipe outlet (242). The adapter pipe inlet (241) is connected to and adapted to the fluid outlet (2311). The adapter pipe outlet (242) is circular. From the adapter pipe inlet (241) to the adapter pipe (24), the outer contour shape of the cross-section of the adapter pipe (24) gradually transitions from oval to circular.

7. The fan system according to claim 6, characterized in that, The height H of the adapter pipe (24) in the vertical direction is greater than or equal to 50 mm and less than or equal to 200 mm.

8. The fan system according to claim 6, characterized in that, One of the air outlet hood and the adapter pipe (24) is provided with a plug-in slot (233), and the other of the two is plugged into the plug-in slot (233); and / or The fan system also includes a first fixing component (25) that fixes the adapter pipe (24) to the outdoor pipe (200); and / or The fan system also includes a second fixing component (26), which fixes the air outlet shroud to the adapter pipe (24).

9. The fan system according to claim 6, characterized in that, The air hood also includes a fluid inlet (2312), which is connected to and communicates with the air outlet (212). In a longitudinal section extending along the second direction, the tangent at the air outlet (212) is collinear with the tangent at the fluid inlet (2312).

10. An oil fume treatment device, comprising a housing (10), characterized in that, The fume treatment device further includes an exhaust hood as described in any one of claims 1 to 4 and / or a fan system as described in any one of claims 5 to 9.

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