Oil smoke suction equipment

Abstract

The utility model belongs to the technical field of kitchen electric appliances, and discloses oil smoke suction equipment which comprises a machine shell, a turning plate, a fixing seat, a turning hinge and a temperature sensing assembly. The turning plate is used for opening or closing the smoke inlet; the fixed seat is arranged on the shell; the overturning hinges are arranged at the two opposite ends of the fixing base correspondingly, and the overturning hinges are connected with the overturning plate and the machine shell so that the overturning plate can rotate relative to the machine shell. The temperature sensing assembly is arranged on the fixing base and used for detecting the temperature of the cooker. The overturning hinges and the temperature sensing assembly are installed on the fixing base, the fixing base is connected with the exhaust fume collecting hood, the installation distance between the overturning hinges on the two sides and the position precision of the temperature sensing assembly can be guaranteed, and therefore the continuity and precision of movement of the overturning plate are guaranteed, and the detection precision of the temperature sensing assembly is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to an oil fume extraction device. Background Technology

[0002] Range hoods are common kitchen appliances for removing cooking fumes. Most range hoods now come with a flap and a temperature sensor. The flap is connected to the casing via hinges on both sides, allowing it to rotate relative to the casing under the action of an electric actuator, thus opening or closing the smoke inlet as needed. The temperature sensor detects the temperature of the cooktop to help adjust the range hood's fume extraction efficiency.

[0003] The existing flip hinge and temperature sensor are directly fixed to the fume hood of the machine housing. Due to the risk of inaccurate positioning and deformation of the mounting holes on the fume hood during processing and assembly, the flip hinge cannot achieve the rotation function after the flip hinge and flip plate are installed, or the movement is discontinuous and cannot reach the predetermined position. The installation position accuracy of the temperature sensor is not high, making it difficult to guarantee the accuracy of temperature detection. Utility Model Content

[0004] The purpose of this utility model is to provide a fume extraction device that can solve the problems of inaccurate hole positions on the fume collection hood assembly leading to malfunction or discontinuity of the flap rotation function and inaccurate temperature sensor detection.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A fume extraction device, comprising:

[0007] A housing, on which a smoke inlet is provided;

[0008] A flap, used to open or close the smoke inlet;

[0009] A mounting base is provided on the housing;

[0010] A flip hinge is provided at both ends of the fixed base, and the flip hinge connects the flip plate and the housing so that the flip plate can rotate relative to the housing;

[0011] A temperature sensing component is disposed on the mounting base, and the temperature sensing component is used to detect the temperature of the stove.

[0012] As an optional solution for the above-mentioned fume extraction device, the temperature sensing component is located between the flip hinges at both ends;

[0013] And / or, both the mounting base and the housing are provided with detection windows, and the temperature sensing component is directly opposite the detection window;

[0014] And / or, the fixing seat includes a first reinforcing boss, and the flip hinge is disposed on the first reinforcing boss;

[0015] And / or, the mounting base includes a second reinforcing boss, and the temperature sensing component is disposed on the second reinforcing boss.

[0016] As an alternative to the above-mentioned fume extraction device, a groove is provided on the first reinforcing protrusion, and the groove is used to avoid the flip hinge;

[0017] And / or, a positioning plate is provided on the fixing base around the detection window, and the temperature sensing component abuts against the positioning plate;

[0018] And / or, the first reinforcing boss and / or the second reinforcing boss are formed by stamping.

[0019] As an optional solution for the above-mentioned fume extraction device, one of the positioning plate and the temperature sensing component is provided as a positioning protrusion, and the other is provided with a positioning recess, wherein the positioning protrusion and the positioning recess are engaged.

[0020] As an optional solution for the above-mentioned fume extraction device, the housing includes a main unit and a fume collection hood. The fume collection hood is provided with the fume inlet, and the bottom end of the main unit extends into the fume collection hood and communicates with the fume collection hood.

[0021] As an optional solution for the above-mentioned fume extraction device, the fume extraction device further includes an oil cup connected to the bottom end of the fume collection hood, the fixing base is provided with an oil guiding surface, the height of the oil guiding surface gradually decreases from the fixing base to the oil cup, and / or the oil guiding surface is a curved surface.

[0022] As an alternative to the aforementioned fume extraction device, at least a portion of the sidewall of the main unit is projected vertically within the mounting base.

[0023] As an optional solution for the above-mentioned fume extraction device, the mounting base includes a mounting plate and an oil baffle plate connected to the mounting plate. The flip hinge and the temperature sensing component are disposed on the mounting plate, and the oil baffle plate is located on the circumferential outer side of the main unit housing.

[0024] As an alternative to the above-mentioned fume extraction device, the oil baffle is located on the edge of the fixed plate and is U-shaped.

[0025] As an optional solution for the above-mentioned fume extraction equipment, the mounting base is detachably connected to the housing.

[0026] The beneficial effects of this utility model are:

[0027] In the fume extraction device provided by this utility model, the flip hinge and the temperature sensing component are installed on the fixed base, which is connected to the fume hood. This ensures the installation distance of the flip hinges on both sides and the positional accuracy of the temperature sensing component, thereby ensuring the continuity and accuracy of the flip plate movement and the detection accuracy of the temperature sensing component. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the fume extraction device provided by this utility model;

[0029] Figure 2 This is a cross-sectional view of the fume extraction device provided by this utility model;

[0030] Figure 3 This is a schematic diagram of the first structure of the fixing base provided by this utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the fixed base and hinge provided by this utility model;

[0032] Figure 5 This is a schematic diagram of the second structure of the fixing base provided by this utility model;

[0033] Figure 6 This is a first structural schematic diagram of a portion of the fans provided by this utility model;

[0034] Figure 7 This is a schematic diagram of the second structure of a portion of the fan provided by this utility model;

[0035] Figure 8 This is a cross-sectional view of the main unit chassis and fan provided by this utility model;

[0036] Figure 9 This is a first structural schematic diagram of the main unit chassis and fan provided by this utility model;

[0037] Figure 10 This is a first structural schematic diagram of the flow guiding structure provided by this utility model;

[0038] Figure 11 This is a second structural schematic diagram of the main unit chassis and fan provided by this utility model;

[0039] Figure 12 This is a schematic diagram of the second structure of the flow guiding structure provided by this utility model;

[0040] Figure 13 This is the first flowchart of the design method provided by this utility model;

[0041] Figure 14 This is the second flowchart of the design method provided by this utility model;

[0042] Figure 15This is a schematic diagram of the flow guiding structure provided by this utility model during the design process.

[0043] In the picture:

[0044] 10. Casing; 11. Main unit box; 12. Smoke hood; 121. Smoke inlet; 20. Fan; 21. Fan body; 211. Volute; 2111. First air inlet; 2112. Second air inlet; 2113. Air outlet; 212. Impeller; 213. Motor; 22. Airflow guiding structure; 221. First airflow guiding surface; 2211. Clearance structure; 222. Second airflow guiding surface; 2221. Upper guide surface; 22 22. Lower guide surface; 223. Oil guide part; 224. End plate; 2241. Front inclined surface; 2242. Rear inclined surface; 30. Fixing seat; 31. Fixing plate; 311. First reinforcing boss; 3111. Groove; 312. Second reinforcing boss; 3121. Detection window; 3122. Positioning plate; 3123. Protrusion; 32. Oil baffle plate; 41. Seat body; 42. Rotating shaft; 43. Connecting rod; 50. Oil cup. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] 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, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly 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.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides a fume extraction device, including a housing 10, a filter assembly (not shown), and a fan 20 disposed within the housing 10. A smoke exhaust channel is formed within the housing 10, and a smoke inlet 121 communicating with the smoke exhaust channel is provided on the housing 10. The filter assembly is disposed at the smoke inlet 121. When the fume extraction device is started, the fan 20 starts, creating a negative pressure within the smoke exhaust channel to draw external fumes into the channel through the smoke inlet 121. As the fumes pass through the filter assembly, oil and impurities are filtered out, and the filtered airflow is discharged along the smoke exhaust channel, thereby purifying the indoor environment.

[0051] In some embodiments, the housing 10 includes a main unit box 11 and a fume hood 12. The main unit box 11 is disposed above and communicates with the fume hood 12. The fan 20 is disposed inside the main unit box 11. The fume hood 12 is provided with a smoke inlet 121. The filter assembly is connected to the fume hood 12 and covers the smoke inlet 121 to ensure that the oil fumes drawn into the fume hood 12 are filtered by the filter assembly.

[0052] Since users' stoves are generally equipped with two burners, in order to improve the fume extraction effect, the fume hood 12 is provided with two fume inlets 121. The two fume inlets 121 are spaced apart in the left and right direction. Each fume inlet 121 is equipped with a filter screen assembly. Each fume inlet 121 corresponds to one burner to prevent the fumes from escaping and improve the fume extraction effect.

[0053] It should be noted here that the left and right directions refer to the left and right directions when the user is facing the range hood. The smoke inlet 121 is a hollow area on the casing 10 that allows airflow to pass through.

[0054] The fume extraction device also includes a flap, a hinge, and a temperature sensing component. The flap is connected to the housing 10 via the hinge, allowing it to move relative to the fume collection hood 12 to open or close the smoke inlet 121. When the flap closes the smoke inlet 121, it obstructs the filter assembly, improving the appearance of the fume extraction device. When the flap opens the smoke inlet 121, it forms a smoke-gathering area with the fume collection hood 12, which helps improve the fume extraction effect.

[0055] A temperature sensing component is installed on the housing 10 to detect the temperature of the stove. Based on the stove temperature, the concentration of oil fumes is determined, thereby adjusting the efficiency of the fan 20 to improve the oil fume extraction effect.

[0056] To improve the stability of the flipping mechanism, flipping hinges are connected to both ends of the flipping mechanism to make the force on both ends more even and synchronize the movement, thereby improving the stability of the flipping mechanism.

[0057] In some embodiments, the fume extraction device further includes a flip drive assembly, the output of which is connected to a flap or a flip hinge to drive the flap movement.

[0058] Optionally, the tilting drive assembly may include an electric actuator, a cylinder, a hydraulic cylinder, or other drive structures capable of outputting linear motion.

[0059] Optionally, the fume extraction equipment also includes a control component, which is electrically connected to the temperature sensing component and the fan 20 respectively, so that the control component can adjust the operating parameters of the fan 20 according to the temperature detected by the temperature sensing component to meet the smoke exhaust requirements.

[0060] In the existing technology, the flap is directly fixed to the fume hood 12 via a flip hinge, with each flip hinge installed individually. The temperature sensing component is directly fixed to the fume hood 12. However, during the processing, assembly, or transportation of the fume hood 12, there is a risk of inaccurate positioning or deformation of the mounting holes. After the flap is installed, there are problems such as the inability to achieve the rotation function, or discontinuous movement, and failure to reach the predetermined position. Furthermore, the temperature sensing component may be installed in an inaccurate position, leading to inaccurate temperature detection, which in turn affects the adjustment of the fume extraction effect of the fume extraction equipment and impacts the user experience.

[0061] To address the above problems, in some embodiments, such as Figure 2 and Figure 3 As shown, the fume extraction device also includes a mounting base 30, which is fixed to the fume collection hood 12. The flip hinge and temperature sensing component are both mounted on the mounting base 30. By using the mounting base 30, the assembly spacing of the flip hinges on both sides and the installation accuracy of the temperature sensing component can be ensured, thereby guaranteeing the stability of the flap movement and the accuracy of temperature detection. Furthermore, the mounting base 30 integrates the installation functions of the temperature sensing component and the flip hinge, which helps simplify the structure of the fume extraction device, reduce costs, and simplify assembly.

[0062] In some embodiments, hinge mounting positions are provided at both ends of the fixed base 30, and each hinge mounting position is used to install a flip hinge. A temperature sensing mounting position is provided on the fixed base 30 between the two hinge mounting positions, and the temperature sensing component is located at the temperature sensing mounting position, so that the temperature sensing component is located in the middle of the left and right direction of the fume extraction device to ensure the accuracy of temperature detection.

[0063] In some embodiments, both the mounting base 30 and the smoke hood 12 are provided with detection windows 3121. The detection windows 3121 on the mounting base 30 and the smoke hood 12 face each other. The detection end of the temperature sensing component is respectively arranged opposite to the two detection windows 3121 so as to detect the temperature at the stove through the two detection windows 3121 and avoid the detection end being blocked.

[0064] To improve the strength of the fixed base 30 and prevent deformation of the fixed base 30 from affecting the installation accuracy of the flip hinge and temperature sensing component, in some embodiments, a second reinforcing structure is provided on the fixed base 30 to improve the strength of the fixed base 30, reduce the probability of deformation of the fixed base 30 during transportation or installation, and thus ensure smooth movement of the flip plate and accurate temperature detection.

[0065] In some embodiments, the second reinforcing structure includes a first reinforcing boss 311, and the flip hinge is disposed on the first reinforcing boss 311. By providing the first reinforcing boss 311, on the one hand, the structural strength of the fixed seat 30 can be improved, especially the strength at the connection position with the flip hinge, so as to ensure the installation accuracy of the flip hinge; on the other hand, the first reinforcing boss 311 can also raise the flip hinge, providing space for the movement of the flip hinge and avoiding contact interference between the flip hinge and the fixed seat 30 or the smoke hood 12, so as to ensure the smooth movement of the flip plate.

[0066] In some embodiments, the first reinforcing boss 311 can be formed by stamping, which can improve the strength of the fixing seat 30, reduce the amount of material used in the fixing seat 30, reduce the weight of the equipment, and reduce costs.

[0067] like Figure 4 As shown, the flip hinge includes a base 41, a rotating shaft 42 rotatably mounted on the base 41, and a connecting rod 43 connected to the rotating shaft 42. The base 41 is fixed on the first reinforcing boss 311, and the connecting rod 43 is connected to the flip plate. When the flip drive assembly is activated, the rotating shaft 42 rotates, causing the connecting rod 43 to rotate, thereby causing the flip plate to flip relative to the smoke hood 12.

[0068] Optionally, the base 41 and the first reinforcing boss 311 can be fixedly connected by screws or by snap-fit.

[0069] In some embodiments, the fixing seat 30 is located on the top inner side of the smoke hood 12, above the smoke inlet 121. In order to facilitate the flap to open or close the smoke inlet 121 on the outside of the smoke hood 12, the connecting rod 43 is arc-shaped so that the connecting rod 43 can avoid the fixing seat 30 and extend out of the smoke hood 12 to connect with the flap.

[0070] In some embodiments, the first reinforcing boss 311 is provided with a groove 3111, which can avoid the connecting rod 43 and prevent interference between the first reinforcing boss 311 and one end of the connecting shaft 42 of the connecting rod 43, ensuring that the flap can open and close smoothly and move into place.

[0071] In some embodiments, the second reinforcing structure includes a second reinforcing boss 312, to which the temperature sensing component is fixed. The second reinforcing boss 312 can improve the strength of the mounting base 30, especially the strength of the position where the temperature sensing component is installed, to ensure the installation accuracy of the temperature sensing component and thus improve the accuracy of the temperature sensing component's detection results.

[0072] The detection window 3121 on the fixed base 30 is set on the second reinforcing boss 312 to ensure that the detection end of the temperature sensing component can be directly opposite the detection window 3121 to detect the temperature of the stove.

[0073] In some embodiments, the second reinforcing boss 312 can be formed by stamping, which can improve the strength of the fixing seat 30, reduce the amount of material used in the fixing seat 30, reduce the weight of the equipment, and reduce costs.

[0074] To improve the fixing effect of the temperature sensing component, in some embodiments, a positioning plate 3122 is provided on the second reinforcing boss 312 around the detection window 3121. The positioning plate 3122 forms a snap-fit ​​space to accommodate the temperature sensing component. The temperature sensing component is fixed by tight fit with the snap-fit ​​space. The structure is simple and easy to disassemble and assemble.

[0075] In some embodiments, the detection window 3121 is rectangular, and each side of the rectangular detection window 3121 is provided with a positioning plate 3122 to improve the positioning and fixing effect of the temperature sensing component.

[0076] To improve the fixing effect of the temperature sensing component, in some embodiments, one of the positioning plate 3122 and the temperature sensing component is provided with a protrusion 3123 and the other is provided with a recess. The protrusion 3123 can cooperate with the recess to make the temperature sensing component more securely fixed.

[0077] In order to effectively collect and discharge waste oil, in some embodiments, the bottom end of the main unit 11 extends into the fume hood 12, so that the oil stains adhering to the inner wall of the main unit 11 can flow along the side wall of the main unit 11 after forming oil droplets, and then drip onto the fume hood 12. The fume hood 12 guides the oil to a designated location, thereby collecting the waste oil in the main unit 11 and preventing the waste oil on the main unit 11 from overflowing out of the range hood through the assembly gap between the main unit 11 and the fume hood 12.

[0078] In some embodiments, such as Figure 2As shown, the bottom of the smoke hood 12 is connected to an oil cup 50, and the waste oil on the smoke hood 12 can enter the oil cup 50 to achieve centralized collection of waste oil for convenient regular cleaning.

[0079] In some embodiments, the fume hood 12 includes a front plate, with a smoke inlet 121 disposed on the front plate. The front plate is inclined from top to bottom and rearward, and an oil cup 50 is disposed on the rear side of the bottom end of the fume hood 12. This arrangement can guide the waste oil on the inner wall of the fume hood 12, so that the waste oil can flow to the rear side of the bottom end of the fume hood 12 under the action of gravity and enter the oil cup 50.

[0080] In some embodiments, the fixing seat 30 is located at the top inner side of the smoke hood 12 and close to the front side, that is, the fixing seat 30 is located at the top front side of the front plate, so that the waste oil on the fixing seat 30 can flow along the front plate and be collected in the oil cup 50.

[0081] In some embodiments, the fixing seat 30 includes an oil guiding surface, the height of which gradually decreases from the fixing seat 30 toward the oil cup 50, so that the waste oil on the fixing seat 30 can flow to the oil cup 50 through the oil guiding surface, thereby improving the collection effect of waste oil on the fixing seat 30.

[0082] Optionally, the height of the oil guide surface gradually decreases from front to back.

[0083] Optionally, the oil guiding surface is curved, and the first reinforcing boss 311 can be set on the curved surface, so that the first reinforcing boss 311 is tilted, which can prevent waste oil from accumulating on the first reinforcing boss 311 and affecting the normal operation of the drive component.

[0084] In some other embodiments, the oil guiding surface can be replaced by other flow guiding structures, such as flow guiding ribs and flow guiding grooves, as long as they can guide the fluid to flow in a specified direction.

[0085] In some embodiments, at least a portion of the sidewall of the main unit 11 is projected vertically into the mounting base 30, so that waste oil dripping from at least a portion of the sidewall of the main unit 11 can drip onto the mounting base 30 and flow to the oil cup 50 through the guiding effect of the mounting base 30, thereby improving the collection effect of waste oil.

[0086] To prevent waste oil dripping from the main unit 11 from flowing towards the front of the fume hood 12, in some embodiments, combined with Figure 3 and Figure 5As shown, the mounting base 30 includes a mounting plate 31 and an oil baffle plate 32 connected to the mounting plate 31. A flip hinge and a temperature sensing assembly are mounted on the mounting plate 31, and the oil baffle plate 32 is located on the outer circumferential side of the main unit housing 11. By setting the oil baffle plate 32, waste oil dripping onto the mounting plate 31 can be prevented from flowing towards the outer edge of the fume hood 12 located on the main unit housing 11, which is beneficial for the collection of waste oil.

[0087] In some embodiments, the oil baffle 32 is disposed on the edge of the fixed plate 31 and is U-shaped. That is, the oil baffle 32 surrounds the three sides of the fixed plate 31, that is, the front side and the left and right sides of the fixed plate 31 are provided with oil baffle 32, which can better prevent waste oil on the fixed plate 31 from flowing to other positions.

[0088] In some embodiments, the mounting base 30 and the smoke hood 12 are detachably connected to facilitate maintenance and cleaning.

[0089] Optionally, the mounting base 30 and the smoke hood 12 can be fixed by screws or snap-fit.

[0090] In some embodiments, to increase the amount of oil fume discharged, the fan 20 has dual-sided air intake to increase the air intake area. For example... Figure 6 and Figure 7 As shown, the fan 20 includes a fan body 21, which includes a volute 211, an impeller 212, and a motor 213. The volute 211 has a first air inlet 2111 and a second air inlet 2112 respectively disposed on its two opposite sidewalls along a first direction. The motor 213 is connected to the volute 211 and is disposed on one side of the second air inlet 2112. The impeller 212 is rotatably disposed inside the volute 211, with its axis extending along the first direction. The impeller 212 is connected to the output end of the motor 213. When the motor 213 starts, it drives the impeller 212 to rotate, thereby driving the airflow outside the volute 211 to enter the volute 211 through the first air inlet 2111 and the second air inlet 2112, and then discharge it through the air outlet 2113 on the volute 211.

[0091] Optionally, the air outlet 2113 is located on the outer peripheral surface of the volute 211, and the fan 20 can take in air through the two end faces of the axial direction and exit air in the circumferential direction.

[0092] It is understandable that the motor 213 is located on one side of the second air inlet 2112, which occupies the space of the second air inlet 2112. This reduces the actual air intake area of ​​the second air inlet 2112, resulting in a large difference in air intake performance on both sides of the fan 20, which is not conducive to optimizing air performance.

[0093] To solve the above problems, combined with Figure 1 and Figure 8As shown, the volute 211 is located on the side of the main housing 11 along the central axis b of the first direction, closer to the second air inlet 2112, along the central axis a of the first direction. That is, the volute 211 is offset towards the side of the second air inlet 2112 within the main housing 11 along the first direction. The distance between the side of the volute 211 with the second air inlet 2112 and its opposite inner wall of the housing 10 is small, while the distance between the side of the volute 211 with the first air inlet 2111 and its opposite inner wall of the housing 10 is larger. This arrangement increases the wind pressure on the side of the second air inlet 2112, thereby increasing the airflow velocity and thus increasing the air intake volume of the second air inlet 2112. This optimizes and balances the airflow performance on both sides, ensuring the effective extraction of fumes from the stove area on the side of the second air inlet 2112.

[0094] In some embodiments, the first direction is left-right. That is, the arrangement direction of the first air inlet 2111 and the second air inlet 2112 is the same as the arrangement direction of the two smoke inlets 121 on the smoke hood 12, so that the first air inlet 2111 and the second air inlet 2112 can each correspond to one smoke inlet 121. The airflow direction entering the smoke hood 121 from the smoke inlet 121 does not need to change much before entering the first air inlet 2111 or the second air inlet 2112, which can reduce the loss of airflow energy, avoid airflow turbulence, and thus ensure the extraction effect of oil fumes.

[0095] To prevent airflow from directly impacting the bottom of the volute 211 and causing turbulence, loss of fluid energy, and noise, a flow guide structure 22 is provided at the bottom of the volute 211. The flow guide structure 22 can guide the airflow below the volute 211 to flow towards the first air inlet 2111 or the second air inlet 2112. However, oil stains will adhere to the flow guide structure 22. After the oil stains accumulate and form oil droplets, there is a problem that they can directly penetrate the filter screen component at the smoke inlet 121 and fall onto the stove or even into the pot, which greatly affects the user experience.

[0096] To solve the above problems, in this embodiment, the width of the flow guiding structure 22 gradually increases from bottom to top along the first direction, so that the bottom end of the flow guiding structure 22 forms an oil guiding part 223. The waste oil on the surface of the flow guiding structure 22 will flow along the surface of the flow guiding structure 22 under the action of gravity and gather in the oil guiding part 223. The projection of the oil guiding part 223 in the vertical direction is located outside the smoke inlet 121, so that the oil droplets dripping from the oil guiding part 223 can be blocked by the smoke collection hood 12, avoiding direct dripping into the stove or pot.

[0097] In some embodiments, the distance between the oil guide portion 223 and the first air inlet 2111 along the first direction is less than the distance between the oil guide portion 223 and the second air inlet 2112 along the first direction. That is, the oil guide portion 223 is positioned closer to the first air inlet 2111 than the second air inlet 2112. This arrangement allows the oil guide portion 223 to be closer to the central axis b of the main unit housing 11 along the first direction, while the central axis of the fume hood 12 along the first direction generally coincides with the central axis b. Thus, on the one hand, the solid portion between the two smoke inlets 121 on the fume hood 12 can be used to catch the waste oil dripping from the oil guide portion 223, preventing waste oil from dripping into the stove or cookware; on the other hand, the oil guide portion 223 can avoid the filter assembly with a small offset distance, which will not have a significant impact on the air guiding effect of the air guiding structure 22, and the size and shape of the air guiding structure 22 are also easier to control.

[0098] In addition, the oil guide section 223 is closer to the central axis b of the main unit box 11 along the first direction, which is conducive to the airflow being evenly distributed to both sides of the oil guide section 223 along the first direction under the action of the oil guide section 223. This is conducive to optimizing and balancing the suction effect of the first air inlet 2111 and the second air inlet 2112, and to improving the performance of the fume extraction equipment.

[0099] In some embodiments, the oil guiding portion 223 can be an oil guiding ridge, forming a sharp point at the bottom end of the guiding structure 22, so as to better collect waste oil at the oil guiding ridge and realize the directional discharge of waste oil.

[0100] In some embodiments, such as Figure 9 As shown, the position of the oil guide 223 in the vertical section parallel to the left and right direction can be located on the central axis a of the main unit 11 along the first direction, so that the oil guide 223 is in the middle position of the main unit 11 along the first direction, thereby improving the uniformity of air intake on both sides of the fan 20.

[0101] In some embodiments, such as Figure 9 As shown, the airflow guiding structure 22 includes a first airflow guiding surface 221 and a second airflow guiding surface 222 arranged opposite to each other along a first direction. The bottom ends of the first airflow guiding surface 221 and the second airflow guiding surface 222 are connected to form an oil guiding part 223. The first airflow guiding surface 221 is located on the side of the second airflow guiding surface 222 away from the second air inlet 2112 along the first direction. The distance between the first airflow guiding surface 221 and the second airflow guiding surface 222 along the first direction gradually increases from bottom to top. This arrangement makes the bottom dimension of the airflow guiding structure 22 small along the first direction. The oil stains attached to the surface of the airflow guiding structure 22 can flow downward along its surface to the oil guiding part 223 under the action of gravity, so that the oil collects and drips in the oil guiding part 223, fixing the dripping position of waste oil, thereby ensuring the cleanliness and effective operation of the range hood and avoiding unreasonable oil accumulation and dripping.

[0102] In some embodiments, the oil guiding portion 223 is an edge formed at the connection between the first air guiding surface 221 and the second air guiding surface 222, in order to simplify the structure and reduce processing costs. In other embodiments, the oil guiding portion 223 can be a plane or a curved surface connecting the first air guiding surface 221 and the second air guiding surface 222.

[0103] In some embodiments, the angle between the cross-section of the second guide surface 222 and the vertical direction decreases from bottom to top. This arrangement can gradually change the airflow direction, better achieve the wall adhesion effect of the airflow, and allow the airflow to gradually change its flow direction along the second guide surface 222, thereby better guiding the airflow towards the second air inlet 2112. Moreover, compared to the second guide surface 222 having a constant angle between its cross-section and the vertical direction, the change in the angle allows the positive pressure exerted by the airflow on the second guide surface 222 to be relatively small, resulting in less airflow energy loss and a better guiding effect.

[0104] In some embodiments, such as Figure 10 As shown, the second air guide surface 222 includes two guide surfaces arranged sequentially from bottom to top. Both guide surfaces are planes, and the angle between the tangent of the lower guide surface and the vertical direction is greater than the angle between the tangent of the upper guide surface and the vertical direction.

[0105] For ease of explanation, the guide surface located below is called the lower guide surface 2222, and the guide surface located above is called the upper guide surface 2221. The angle between the lower guide surface 2222 and the vertical direction is α, and the angle between the upper guide surface 2221 and the vertical direction is β. Therefore, angle α is greater than angle β. It can be understood that if the second guide surface 222 is a single plane, such as... Figure 10 As shown by the dashed line, the angle θ between this single plane and the vertical direction is greater than angles α and β. Therefore, when the airflow directly impacts the single plane, the normal pressure exerted by the airflow on the single plane is greater, resulting in greater energy loss and hindering the performance of the fume extraction equipment. By optimizing the single plane into a double plane composed of a lower guide surface 2222 and an upper guide surface 2221, the normal pressure exerted by the airflow impacting both the lower guide surface 2222 and the upper guide surface 2221 is reduced, and the energy loss of the airflow is smaller, which is beneficial for improving the airflow guiding effect.

[0106] For the upper guide surface 2221 and the lower guide surface 2222, the smaller the angle between the guide surface and the vertical direction, the better the guiding effect of the guide surface on the airflow to the first air inlet 2111 or the second air inlet 2112. Therefore, the area of ​​the upper guide surface 2221 is greater than or equal to the area of ​​the lower guide surface 2222 in order to improve the guiding effect of the second air guide surface 222 on the overall airflow.

[0107] Optionally, the area of ​​the upper guide surface 2221 is 0.5-0.8 times the area of ​​the second guide surface 222, preferably 0.6-0.8 times. While ensuring that the area of ​​the upper guide surface 2221 is greater than the area of ​​the lower guide surface 2222, the area of ​​the lower guide surface 2222 should not be too small to avoid an excessively large angle between the lower guide surface 2222 and the vertical direction, which would affect the airflow guiding effect. Therefore, setting the area of ​​the upper guide surface 2221 to 0.5-0.8 times that of the second guide surface 222 can prevent an excessively large angle between the lower guide surface 2222 and the vertical direction, and ensure that the area of ​​the upper guide surface 2221 is greater than that of the lower guide surface 2222, thereby improving the airflow guiding effect.

[0108] For example, the area of ​​the upper guide surface 2221 can be 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times, 0.75 times, or 0.8 times the area of ​​the second guide surface 222. The above values ​​are only typical values, but are not limited to them.

[0109] In some other embodiments, the second air guide surface 222 may include three, four or more guide surfaces.

[0110] In some other embodiments, at least one guide surface is curved, and the curved surface protrudes outward from the guide structure 22, which can also guide the airflow.

[0111] To prevent airflow from directly impacting the volute 211, in some embodiments, the distance between the top of the first air guide surface 221 and the top of the second air guide surface 222 along the first direction is greater than or equal to the width of the volute 211 along the first direction. On the one hand, this prevents the airflow guided by the first air guide surface 221 or the second air guide surface 222 from directly impacting the volute 211 when it flows to the top of the guide structure 22, thus preventing the volute 211 from forming a flange at the top of the guide structure 22 and avoiding turbulence at the flange, ensuring the guiding effect. On the other hand, after the oil stains attached to the outer wall of the volute 211 gather into oil droplets, the oil droplets can first drip or flow onto the guide structure 22, and then flow from the surface of the guide structure 22 to the oil guide part 223. This prevents the oil droplets on the volute 211 from directly dripping onto the smoke collection hood 12 or the filter assembly below, ensuring that the waste oil can be collected and flowed along the set route, which is beneficial to ensuring the cleanliness and normal operation of the fume extraction equipment.

[0112] In some embodiments, the distance between the top of the first air guide surface 221 and the top of the second air guide surface 222 along the first direction is greater than the width of the volute 211 along the first direction, and the top of the first air guide surface 221 and the top of the second air guide surface 222 are both located on the outside of the volute 211, so as to improve the guiding effect on airflow and waste oil.

[0113] In some embodiments, the flow guiding structure 22 includes two side plates and two end plates 224. The two side plates are arranged opposite each other along a first direction, and their bottom ends are connected. The outer walls of the side plates form a first air guiding surface 221 or a second air guiding surface 222. The two end plates 224 are arranged opposite each other along a second direction and are respectively connected to the two side plates. The flow guiding structure 22 is formed by four plates. The flow guiding structure 22 is a hollow structure, which is lightweight and low-cost, thus helping to control costs. The second direction is perpendicular to the first direction and parallel to the first air guiding surface 221 and the second air guiding surface 222, respectively. For example, the second direction is the front-back direction.

[0114] In some other embodiments, the first direction and the second direction can be adjusted according to actual needs, for example, the first direction is the front-back direction and the second direction is the left-right direction.

[0115] In order to prevent oil from accumulating inside the flow guiding structure 22, in some embodiments, an oil outlet hole is provided at the bottom end of the flow guiding structure 22, through which waste oil located inside the flow guiding structure 22 can flow out.

[0116] In some embodiments, such as Figure 11 and Figure 12 As shown, the top of the first air guide surface 221 and the top of the second air guide surface 222 are provided with a clearance structure 2211. The clearance structure 2211 is used to avoid the volute 211 and prevent the air guide structure 22 from interfering with the volute 211.

[0117] In some embodiments, the clearance structure 2211 can be a clearance groove, and a portion of the volute 211 can be embedded in the clearance groove to avoid interference. Optionally, the clearance groove can be formed on the inner side of the side plate by stamping.

[0118] In some embodiments, the thickness of the flow guiding structure 22 along the second direction is less than the thickness of the main unit chassis 11 along the second direction, so that the flow guiding structure 22 can be smoothly installed into the main unit chassis 11.

[0119] To reduce assembly difficulty, such as Figure 12 As shown, in some embodiments, the thickness of at least the bottom end of the flow guiding structure 22 gradually decreases from top to bottom along the second direction, so that both end plates 224 are formed with avoidance slopes, which slope downwards towards the middle of the flow guiding structure 22. For ease of explanation, the avoidance slope located on the front side is the front slope 2241, and the avoidance slope located on the rear side is the rear slope 2242. The front slope 2241 slopes downwards towards the rear, and the rear slope 2242 slopes downwards towards the front. Through the cooperation of the two slopes, the diagonal length of the flow guiding structure 22 along the front-rear direction can be reduced to facilitate assembly.

[0120] Optionally, the inclination angles of the front inclined surface 2241 and the rear inclined surface 2242 can be the same or different, and the specific angles can be set according to actual assembly needs.

[0121] To facilitate the dripping of waste oil collected on the oil guide 223 at a fixed location, in some embodiments, such as Figure 12 As shown, the height of the oil guiding part 223 gradually decreases from one end to the other along the second direction, so that the waste oil collected on the oil guiding part 223 can drip from the end with the lower height of the oil guiding part 223, fix the dripping position, facilitate the planning of the oil path, and realize the collection and cleaning of waste oil.

[0122] In some embodiments, the height of the oil guide 223 gradually decreases from front to back. Combined with Figure 2 As shown, an oil cup 50 is connected to the rear side of the bottom of the smoke collection hood 12. The rear end of the oil guiding part 223 is low, so that the oil droplets on the oil guiding part 223 can drip into the oil cup 50 through the rear end, thereby realizing the collection of waste oil.

[0123] Optionally, the angle δ between the oil guide portion 223 and the horizontal plane can be 2°-4°, for example, the angle δ can be 3°.

[0124] In some embodiments, the flow guiding structure 22 is detachably connected to the volute 211 or the main unit housing 11 to facilitate disassembly for cleaning or maintenance.

[0125] In some embodiments, at least one end plate 224 of the flow guiding structure 22 is provided with a first hook, which is used to cooperate and fix with a second hook on the volute 211 or the main unit chassis 11. Optionally, the first hook can be a hook, and correspondingly, the second hook on the volute 211 or the main unit chassis 11 can be a hanging rod.

[0126] In some embodiments, in order to improve the fixing effect of the flow guiding structure 22, at least one end plate 224 of the flow guiding structure 22 is provided with a fastener, which is fixed in conjunction with the volute 211 or the main chassis 11. Optionally, the fastener can be a screw or a pin.

[0127] In some embodiments, the holes on the end plate 224 that mate with the fasteners are countersunk holes to prevent the fasteners from protruding from the end plate 224 and affecting the assembly.

[0128] In some embodiments, the flow guiding structure 22 is further provided with a first reinforcing structure, which is used to improve the strength of the flow guiding structure 22 and prevent the flow guiding structure 22 from deforming under the impact of airflow, thereby preventing noise from being generated due to the deformation of the flow guiding structure 22.

[0129] Optionally, the first reinforcing structure includes a flange disposed at the edge of the side plate and / or end plate 224, the flange being disposed at an angle to the side plate or end plate 224 to improve the strength of the flow guiding structure 22.

[0130] In some embodiments, the first reinforcing structure may also include reinforcing ribs or stamping structures, both of which can improve structural strength.

[0131] Example 2

[0132] This embodiment provides a design method for designing the fume extraction device of Embodiment 1. For example... Figure 13 As shown, the design method includes:

[0133] S1: Based on the size information of the main unit chassis 11 and the volute 211, obtain the position of the volute 211 within the main unit chassis 11 along the first direction;

[0134] Based on the size information of the main unit 11 and the volute 211, the position of the volute 211 in the main unit 11 along the first direction is determined to optimize the suction performance at the first air inlet 2111 and the second air inlet 2112 on the volute 211, so as to better exhaust the oil fumes.

[0135] S2: Determine the dimensions of the airflow guiding structure 22 based on the dimensions of the main chassis 11 and the volute 211;

[0136] Based on the size information of the main unit 11 and the volute 211, the size of the airflow guiding structure 22 is determined. This ensures that the airflow guiding structure 22 can be assembled smoothly, while optimizing the airflow guiding effect of the airflow guiding structure 22.

[0137] The dimensions of the flow guiding structure 22 include the height of the flow guiding structure 22 and the width of the flow guiding structure 22 along the first direction.

[0138] S3: Determine the shape of the first air guide surface 221 and the second air guide surface 222 according to the size of the air guide structure 22.

[0139] Based on the dimensions of the airflow guiding structure 22, the shapes of the first airflow guiding surface 221 and the second airflow guiding surface 222 are determined, which can optimize the airflow guiding effect and determine the position of the oil guiding part 223 so that the vertical projection of the oil guiding part 223 is offset from the smoke inlet 121, thereby preventing the oil on the oil guiding part 223 from dripping directly into the stove or cookware through the filter assembly, thus improving the user experience.

[0140] In some implementations, such as Figure 14 As shown, step S1 specifically includes:

[0141] S11: Based on the effective air intake area A of the first air intake 2111, the effective air intake area C of the second air intake 2112, and the width W of the main unit 11 along the first direction, determine the offset distance L of the central axis b of the volute 211 relative to the central axis a of the housing 10 toward the side where the second air intake 2112 is located.

[0142] S12: The central axis b of the volute 211 along the first direction is located on the side of the main unit 11 along the central axis a along the first direction, close to the second air inlet 2112.

[0143] Combination Figure 6 and Figure 7 As shown, the first air inlet 2111 is unobstructed, and the effective air intake area A of the first air inlet 2111 is the area of ​​the first air inlet 2111; part of the second air inlet 2112 is blocked by the motor 213, resulting in a reduction in the actual area of ​​the second air inlet 2112, and the effective integral area C of the second air inlet 2112 is the difference between the area of ​​the second air inlet 2112 and the blocking area of ​​the motor 213.

[0144] It is understandable that the effective air intake area A of the first air intake 2111 and the effective air intake area C of the second air intake 2112 are different. If other air intake conditions are the same, the air intake volume of the first air intake 2111 per unit time will be greater than that of the second air intake 2112 per unit time, resulting in an uneven air intake volume of the fume extraction device in the left and right directions, which can easily lead to poor fume extraction effect in some parts of the stove.

[0145] By combining the effective air intake area A of the first air intake 2111, the effective air intake area C of the second air intake 2112, and the width W of the main unit 11 along the first direction, the offset distance L of the central axis b of the volute 211 relative to the central axis a of the housing 10 toward the side where the second air intake 2112 is located can be determined. This allows us to determine the increase in air pressure at the second air intake 2112, thereby balancing the air intake performance on both sides of the first air intake 2111 and the second air intake 2112.

[0146] In some embodiments, the formula for calculating the offset distance L is:

[0147]

[0148] Understandably, the offset distance L is set to compensate for the air volume loss caused by the reduction in the effective air intake area of ​​the second air inlet 2112. The difference between the effective air intake area A of the first air inlet 2111 and the effective air intake area C of the second air inlet 2112 reflects the air volume loss of the second air inlet 2112 relative to the first air inlet 2111 per unit time. The sum of the effective air intake area A of the first air inlet 2111 and the effective air intake area C of the second air inlet 2112 reflects the total air volume of the fume extraction equipment per unit time. The offset distance L reflects the increase in wind speed at the second air inlet 2112.

[0149] Based on the above analysis and research, the offset distance L calculated using the above formula can optimize the airflow distribution within the fume extraction equipment, improve the performance of the fume extraction equipment, and ensure effective fume extraction for dual stoves.

[0150] In some other embodiments, the offset distance L can also be determined through simulation analysis or empirical values.

[0151] In some embodiments, step S2 includes:

[0152] S21: Determine the width of the flow guiding structure 22 along the first direction based on the width of the volute 211 along the first direction. The width of the flow guiding structure 22 along the first direction is greater than or equal to the width of the volute 211 along the first direction.

[0153] This design ensures that the airflow guided by the flow guide structure 22 to the volute 211 will not directly impact the bottom surface of the volute 211, thus avoiding the formation of turbulence and reducing energy loss. In addition, oil stains on the surface of the volute 211 can drip onto the flow guide structure 22, so that waste oil can be collected in a directional manner through the oil guide section 223.

[0154] In some embodiments, such as Figure 15 As shown, the width of the flow guiding structure 22 along the first direction is greater than the width of the volute 211 along the first direction, so that the tops of the first air guiding surface 221 and the second air guiding surface 222 are both located on the outside of the volute 211, so as to better guide the airflow and the waste oil.

[0155] Optionally, the width of the flow guiding structure 22 along the first direction can be J+2ΔJ, and the dimensions of both ends of the flow guiding structure 22 extending out of the volute 211 along the first direction are both ΔJ, where ΔJ can be 2mm-3mm.

[0156] S22: Determine the height of the airflow guiding structure 22 based on the vertical dimensions of the volute 211 and the main unit 11.

[0157] Specifically, the vertical distance between the bottom of the volute 211 and the bottom of the main unit 11 is the first distance. Then the height of the flow guiding structure 22 is equal to the difference between the first distance and the preset distance. The preset distance is the minimum vertical distance between the bottom of the flow guiding structure 22 and the bottom of the main unit 11.

[0158] The fact that the flow guide structure 22 is located below the volute 211 increases the difficulty of assembling the volute 211. Therefore, when determining the height of the flow guide structure 22, it is first ensured that the distance between the oil guide part 223 and the bottom of the main unit housing 11 is greater than or equal to the predetermined distance H2 to ensure smooth assembly. Then, the height of the flow guide structure 22 is determined based on the predetermined distance H2 and the first distance.

[0159] Optionally, the predetermined distance H2 is greater than or equal to 30mm, preferably greater than or equal to 40mm, to reduce assembly difficulty and ensure smooth assembly.

[0160] In some embodiments, step S2 further includes determining the position of the oil guide 223 in a first direction.

[0161] Specifically, the horizontal plane where the oil guiding part 223 is located is determined based on the height of the guide structure 22;

[0162] It should be noted that the vertical distance between the oil guide section 223 and the volute 211 is the height of the flow guide structure 22. Therefore, based on the height of the flow guide structure 22, the horizontal plane where the oil guide section 223 is located can be determined.

[0163] Subsequently, the oil guide 223 is located on the side of the volute 211 along the central axis b of the first direction, close to the first air inlet 2111, and the projection of the oil guide 223 in the vertical direction is located outside the smoke inlet 121.

[0164] By shifting the oil guide portion 223 relative to the central axis b towards the first air inlet 2111, the oil guide portion 223 can be moved closer to the center of the smoke hood 12 along the first direction, so that the vertical projection of the oil guide portion 223 is located outside the filter assembly, thereby preventing waste oil from dripping directly through the filter assembly into the stove or cookware.

[0165] In some embodiments, the smoke inlets 121 are symmetrically arranged on both sides of the central axis a of the main unit 11 along the first direction, and the oil guide 223 is positioned on the central axis a in the vertical section in the left and right directions, so that the waste oil dripping from the oil guide 223 can be intercepted by the smoke collection hood 12 between the two smoke inlets 121. This not only prevents waste oil from dripping into the stove or pot, but also improves the uniformity of air intake on both sides of the fan 20.

[0166] In some embodiments, step S3 includes step S31, to determine the shape of the first air guide surface 221.

[0167] Specifically, step S31 includes:

[0168] S311: Obtain points Q1 and Q2 located on both sides of the central axis b of the volute 211 along the first direction. Points Q1 and Q2 are both located on the outer side of the volute 211 along the first direction, and the distance between points Q1 and Q2 is equal to the width of the guide structure 22 along the first direction.

[0169] In other words, the length of line segment Q1Q2 is equal to J + 2ΔJ.

[0170] It should be noted here that points Q1 and Q2 are located in the vertical plane in the left-right direction.

[0171] In some embodiments, points Q1 and Q2 can be symmetrically arranged on both sides of the central axis b, with the distance between point Q1 and the volute 211 being ΔJ, and the distance between point Q2 and the volute 211 being ΔJ.

[0172] S312: Determine point Q3 on the central axis a of the main chassis 11 along the first direction, and the distance between point Q3 and the bottom surface of the volute 211 is the height of the flow guiding structure 22;

[0173] Based on the height H1 of the guide structure 22, the horizontal plane where the oil guide part 223 is located can be obtained, thus making it easier to obtain the intersection point Q3.

[0174] S313: Connect point Q1 and point Q3 to obtain a first auxiliary line, and use the surface formed by moving the first auxiliary line along the second direction as the first air guide surface 221, wherein the first direction, the second direction and the vertical direction are perpendicular to each other.

[0175] Optionally, the first auxiliary line can be a straight line, and correspondingly, the first air guide surface 221 formed is a plane. Using a plane as the first air guide surface 221 can simplify the processing of the air guide structure 22, reduce costs, and facilitate the installation of the volute 211 and the air guide structure 22 into the main unit housing 11.

[0176] In some other embodiments, the first auxiliary line can be a curve protruding from the outside of the airflow guiding structure 22, and correspondingly, the first airflow guiding surface 221 is a curved surface to improve the airflow guiding effect.

[0177] In some other embodiments, the first auxiliary line can be replaced by a multi-segment broken line, which protrudes outward from the outer side of the guide structure 22 so that the slope of the multi-segment broken line increases from bottom to top.

[0178] In some embodiments, step S3 includes step S32, to determine the shape of the second air guide surface 222.

[0179] Specifically, step S32 includes:

[0180] S321: Obtain points Q1 and Q2 located on both sides of the central axis b of the volute 211 along the first direction. Points Q1 and Q2 are both located on the outer side of the volute 211 along the first direction, and the distance between points Q1 and Q2 is equal to the width of the guide structure 22 along the first direction.

[0181] In other words, the length of line segment Q1Q2 is equal to J + 2ΔJ.

[0182] It should be noted here that points Q1 and Q2 are located in the vertical plane in the left-right direction.

[0183] In some embodiments, points Q1 and Q2 can be symmetrically arranged on both sides of the central axis b, with the distance between point Q1 and the volute 211 being ΔJ, and the distance between point Q2 and the volute 211 being ΔJ.

[0184] S322: Determine point Q3 on the central axis a of the main chassis 11 along the first direction, and the distance between point Q3 and the bottom surface of the volute 211 is the height of the flow guiding structure 22;

[0185] Based on the height H1 of the guide structure 22, the horizontal plane where the oil guide part 223 is located can be obtained, thus making it easier to obtain the intersection point Q3.

[0186] It is understandable that point Q3 represents the position of the oil guide 223. Specifically, point Q3 is the position of the oil guide 223 in the vertical plane in the left-right direction.

[0187] S323: Determine point Q4 on the central axis b of the volute 211 along the first direction, and the distance between point Q4 and the bottom surface of the volute 211 is the height of the flow guiding structure 22;

[0188] S324: Select point Q5 on line segment Q2Q4, and connect point Q2, point Q5 and point Q3 in sequence to obtain the second auxiliary line. The surface formed by moving the second auxiliary line along the second direction is the second air guide surface 222. The first direction, the second direction and the vertical direction are perpendicular to each other.

[0189] Optionally, the second auxiliary line includes two line segments. Correspondingly, the formed second air guide surface 222 includes two planar guide surfaces. Using a planar guide surface can simplify the processing of the air guide structure 22, reduce costs, and facilitate the installation of the volute 211 and the air guide structure 22 into the main unit housing 11.

[0190] In some other embodiments, in the second auxiliary line, at least one of line segments Q3Q5 and Q2Q5 can be a curve protruding outward from the airflow guide structure 22, and correspondingly, the airflow guide surface is a curved surface.

[0191] In some other embodiments, line segment Q3Q5 can be replaced by a multi-segment broken line, with the broken line protruding outward from the guide structure 22 to increase the slope of the multi-segment broken line from bottom to top.

[0192] In some embodiments, the length of line segment Q2Q5 is greater than the length of line segment Q3Q5 to increase the area of ​​the guide surface formed by line segment Q2Q5. The slope of line segment Q2Q5 is larger, which has a better guiding effect on airflow.

[0193] In some embodiments, the length of line segment Q3Q5 is greater than or equal to 0.4 times the length of line segment Q2Q5. Preferably, the length of line segment Q3Q5 is greater than or equal to 0.5 times the length of line segment Q2Q5, so as to avoid the small slope of Q3Q5 affecting the guiding effect of the guide surface it forms.

[0194] In some embodiments, the ridge formed by connecting the first air guide surface 221 and the second air guide surface 222 is an oil guide portion 223, and the height of the oil guide portion 223 gradually decreases from one end to the other along the second direction.

[0195] Optionally, the angle between the oil guide 223 and the horizontal plane can be 2°-4°, for example 3°, so that the waste oil on the oil guide 223 can flow to one end of the oil guide 223 under the action of gravity.

[0196] 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 various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fume extraction device, characterized in that, include: The housing (10) is provided with a smoke inlet (121); A flap is used to open or close the smoke inlet (121); A mounting base (30) is disposed on the housing (10); The flip hinge is provided at both ends of the fixed base (30). The flip hinge connects the flip plate and the housing (10) so that the flip plate can rotate relative to the housing (10). A temperature sensing component is disposed on the fixed base (30), and the temperature sensing component is used to detect the temperature of the stove.

2. The fume extraction device according to claim 1, characterized in that, The temperature sensing component is located between the flip hinges at both ends; And / or, both the mounting base (30) and the housing (10) are provided with a detection window (3121), and the temperature sensing component is directly opposite the detection window (3121); And / or, the fixing seat (30) includes a first reinforcing boss (311), and the flip hinge is disposed on the first reinforcing boss (311); And / or, the mounting base (30) includes a second reinforcing boss (312), and the temperature sensing component is disposed on the second reinforcing boss (312).

3. The fume extraction device according to claim 2, characterized in that, The first reinforcing boss (311) is provided with a groove (3111), which is used to avoid the flip hinge; And / or, a positioning plate (3122) is provided on the fixing base (30) around the detection window (3121), and the temperature sensing component abuts against the positioning plate (3122); And / or, the first reinforcing boss (311) and / or the second reinforcing boss (312) are stamped.

4. The fume extraction device according to claim 3, characterized in that, One of the positioning plate and the temperature sensing component is configured as a positioning protrusion, and the other is configured as a positioning recess, with the positioning protrusion engaging with the positioning recess.

5. The fume extraction device according to any one of claims 1-4, characterized in that, The housing (10) includes a main unit box (11) and a smoke collection hood (12). The smoke collection hood (12) is provided with the smoke inlet (121). The bottom end of the main unit box (11) extends into the smoke collection hood (12) and communicates with the smoke collection hood (12).

6. The fume extraction device according to claim 5, characterized in that, The fume extraction device also includes an oil cup (50) connected to the bottom end of the fume collection hood (12). The fixed seat (30) is provided with an oil guiding surface. The height of the oil guiding surface gradually decreases from the fixed seat (30) towards the oil cup (50), and / or the oil guiding surface is curved.

7. The fume extraction device according to claim 6, characterized in that, At least a portion of the sidewall of the main unit (11) is projected vertically into the mounting base (30).

8. The fume extraction device according to claim 6, characterized in that, The mounting base (30) includes a mounting plate (31) and an oil baffle (32) connected to the mounting plate (31). The flip hinge and the temperature sensing component are mounted on the mounting plate (31), and the oil baffle (32) is located on the circumferential outer side of the main unit housing (11).

9. The fume extraction device according to claim 8, characterized in that, The oil baffle (32) is located on the edge of the fixed plate (31) and is U-shaped.

10. The fume extraction device according to any one of claims 1-4, characterized in that, The mounting base (30) is detachably connected to the housing (10).

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