A range hood with dynamic smoke collection function and its control method

Abstract

This invention discloses a range hood with dynamic smoke collection function and its control method. The range hood includes a smoke collection chamber, a first flap, and a louvered cavity mechanism. The first flap closes the first air inlet of the smoke collection chamber in the closed state, and forms a downward-facing opening with the smoke collection chamber in the open state. One end of the louvered cavity mechanism is rotatably connected to the first flap, and the other end extends into the smoke collection chamber; the louvered cavity mechanism includes a louvered air inlet and multiple guide vanes. The control method includes: detecting the smoke concentration at the air inlet surface of the smoke collection chamber; adjusting the opening angle of the first flap relative to the smoke collection chamber according to the smoke concentration; obtaining the fan speed of the range hood; and adjusting the tilt angle of the guide vanes in the louvered cavity mechanism relative to the louvered air inlet according to the smoke concentration and fan speed. This invention solves the problem of poor smoke capture efficiency in existing range hoods with fixed structures, and can provide adapted smoke collection effects and suction angles for different cooking scenarios, thereby improving smoke capture efficiency.

Description

Technical Field

[0001] This invention relates to the field of smart home technology, and in particular to a range hood with dynamic smoke collection function and its control method. Background Technology

[0002] Existing range hoods have a serious problem with the spread of cooking fumes during use, especially during peak cooking times, when fumes can easily escape outside the kitchen and affect indoor air quality.

[0003] Traditional range hoods have a fixed smoke collection structure that cannot dynamically adjust according to the state of the cooking fumes, resulting in low smoke capture efficiency. In addition, existing range hoods have a single suction method that cannot dynamically adjust according to the cooking scenario, making it difficult to meet the smoke treatment needs of different cooking scenarios. Summary of the Invention

[0004] This invention provides a range hood with dynamic smoke collection function and its control method to adapt to different cooking scenarios, provide suitable smoke collection effect and suction angle, improve smoke capture efficiency, and enhance user experience.

[0005] In a first aspect, embodiments of the present invention provide a range hood with a dynamic smoke collection function, comprising: The smoke collection chamber has a first air inlet on its air inlet surface; The first flap is rotatably connected to the smoke collection chamber. When closed, it seals the first air inlet. When open, it forms a downward-facing opening with the smoke collection chamber. The louver cavity mechanism is rotatably connected to the first flap at one end, and extends into the smoke collection cavity from the first air inlet at the other end. The louver cavity mechanism includes a louvered air inlet and multiple guide vanes; both ends of the guide vanes are rotatably connected to the sides of the louvered air inlet.

[0006] Optionally, the louvered air inlet includes a first louvered air inlet and a second louvered air inlet, which are arranged in a left-right direction.

[0007] Optionally, the louver cavity mechanism also includes a louver drive mechanism and a transmission mechanism. The louver drive mechanism is connected to the rotating shaft of the guide vane through the transmission mechanism and is used to drive the transmission mechanism to rotate the guide vane.

[0008] Optionally, the louver drive mechanism includes a rotary motor; the transmission mechanism includes a first rotating arm, a first connecting rod, a second connecting rod, and a plurality of second rotating arms. The rotating shaft of the rotary motor extends in the left-right direction. The first rotating arm, the first connecting rod, the second connecting rod, and the second rotating arm are all perpendicular to the rotating shaft of the guide vanes. The second connecting rod extends along the arrangement direction of the guide vanes, and multiple second rotating arms are arranged sequentially along the arrangement direction of the guide vanes. The rotating shaft of the rotary motor is fixedly connected to the first end of the first rotating arm; The second end of the first rotating arm is movably connected to the first end of the first connecting rod; The second end of the first link is movably connected to the second link; The second link is movably connected to the first end of a plurality of second rotating arms; The second ends of multiple second rotating arms are fixedly connected to the rotating shafts of multiple guide vanes in a one-to-one correspondence; A rotary motor is used to drive the first rotating arm to rotate around the first end, thereby driving the first connecting rod to move in sequence, the second connecting rod to move along the arrangement direction of the guide vanes, each second rotating arm to rotate, and each guide vane to rotate around the rotating shaft.

[0009] Optionally, the louver drive mechanism and transmission mechanism are located on one side of the guide vane in the left-right direction.

[0010] Optionally, the air inlet surface of the smoke collection chamber is also provided with a second air inlet, which is located below the first air inlet; The range hood also includes a second flap, which is fixedly connected to the smoke collection chamber. The second flap and the smoke collection chamber form an upward opening, and the second air inlet is located inside the opening formed by the second flap and the smoke collection chamber.

[0011] Secondly, embodiments of the present invention also provide a control method for a range hood, applicable to any type of range hood provided in embodiments of the present invention; the control method includes: Detect the concentration of oil fumes at the air inlet surface of the smoke collection chamber; Adjust the opening angle of the first flap relative to the smoke collection chamber according to the concentration of oil fumes; Obtain the fan speed of the range hood; Adjust the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the concentration of oil fumes and the fan speed.

[0012] Optionally, the opening angle of the first flap relative to the smoke-gathering chamber can be adjusted according to the concentration of cooking fumes, including: Based on the preset fume concentration range, the opening angle of the first flap relative to the fume collection chamber is adjusted to the preset opening angle corresponding to the preset fume concentration range; wherein, the preset fume concentration range and the corresponding preset opening angle are positively correlated.

[0013] Optionally, the opening angle of the first flap relative to the smoke-gathering chamber can be adjusted according to the concentration of cooking fumes, including: Based on the preset conversion coefficient between the opening angle adjustment amount and the change in oil fume concentration, the target opening angle adjustment amount of the first flap relative to the smoke gathering chamber is calculated according to the real-time change in oil fume concentration. The opening angle of the first flap relative to the smoke-gathering chamber is adjusted according to the target opening angle adjustment amount.

[0014] Optionally, the opening angle θ of the first flap relative to the smoke collection chamber satisfies: 30°≤θ≤75°.

[0015] Optionally, the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet can be adjusted according to the concentration of cooking fumes and the fan speed, including: From the preset database, retrieve the preset tilt angle of the guide vane relative to the louver air inlet, which corresponds to the preset oil fume concentration range and the preset fan speed range, and use it as the target tilt angle. Adjust the tilt angle of the guide vane relative to the louvered air inlet to the target tilt angle.

[0016] Optionally, the louvered air inlet includes a first louvered air inlet and a second louvered air inlet, which are arranged in a left-right direction. Before adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver inlet, based on the fume concentration and fan speed, the following steps are also included: Determine which burner to start; Adjust the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver inlet according to the concentration of cooking fumes and the fan speed, including: The first and / or second louvered air inlets located on the same side as the burner head being started are identified as the target louvered air inlets. Adjust the tilt angle of the guide vanes in the target louver air inlet relative to the target louver air inlet based on the concentration of oil fumes and the fan speed.

[0017] Optionally, the concentration of oil fumes at the air inlet surface of the smoke collection chamber is detected, including: The concentration of oil fumes at the air inlet surface of the smoke collection chamber is periodically detected at preset time intervals.

[0018] Optionally, before detecting the concentration of oil fumes at the air inlet surface of the smoke collection chamber, the following steps are also included: Adjust the opening angle of the first flap relative to the smoke chamber to the initial opening angle.

[0019] In the technical solution of this invention, a range hood with dynamic smoke collection function includes a smoke collection chamber, a first flap, and a louvered cavity mechanism. The air inlet surface of the smoke collection chamber is provided with a first air inlet. The first flap closes the first air inlet in the closed state and forms a downward-facing opening with the smoke collection chamber in the open state. One end of the louvered cavity mechanism is rotatably connected to the first flap, and the other end extends from the first air inlet into the smoke collection chamber; the louvered cavity mechanism includes a louvered air inlet and multiple guide vanes; both ends of the guide vanes are rotatably connected to the sides of the louvered air inlet. Based on this range hood, by detecting the smoke concentration at the air inlet surface of the smoke collection chamber, and then adjusting the opening angle of the first flap relative to the smoke collection chamber according to the smoke concentration, it can adapt to the smoke concentration conditions, achieving a suitable smoke collection area and angle, and preventing smoke escape. Furthermore, by acquiring the fan speed of the range hood and adjusting the tilt angle of the guide vanes in the louver cavity structure relative to the louver inlet based on the oil fume concentration and fan speed, the system can adapt to the range hood's power and the amount of oil fume by adjusting the first flap to change the louver cavity structure. This adapts to the oil fume's suction path, providing path guidance so that the oil fume smoothly enters the louver inlet, reducing suction resistance. Using the above method, this embodiment of the invention can solve the problem of poor oil fume capture efficiency caused by the fixed smoke collection structure and fixed suction angle of existing range hoods. It can adapt to the actual oil fume conditions and range hood conditions, providing a suitable smoke collection effect and a suitable suction angle, improving oil fume capture efficiency and enhancing the user experience. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a range hood with dynamic smoke collection function provided in an embodiment of the present invention; Figure 2 yes Figure 1 The side view of the range hood shown; Figure 3 yes Figure 1 A partial sectional view of the range hood shown; Figure 4 and Figure 5 yes Figure 1 The diagram shows the structural schematic of the louver cavity mechanism in the range hood. Figure 6 This is a flowchart of a control method for a range hood provided in an embodiment of the present invention; Figure 7 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention; Figure 8 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention; Figure 9 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention.

[0021] In the picture: 10-Smoke collection chamber; 101-First air inlet; 102-Second air inlet; 20-First flap; 30-Louvre cavity mechanism; 31-Louvre air inlet; 311-First louver air inlet; 312-Second louver air inlet; 32-Guide vane; 33-Louvre drive mechanism; 330-Rotary motor; 34-Transmission mechanism; 341-First rotating arm; 342-First connecting rod; 343-Second connecting rod; 344-Second rotating arm; 40-Flap drive mechanism; 400-Push rod motor; 50-Second flap; 60-Main unit housing; 70-Check valve; 80-Fan; 90-Oil cup. Detailed Implementation

[0022] 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 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, and not all of the structures.

[0023] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0025] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0026] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] Figure 1This is a schematic diagram of the structure of a range hood with dynamic smoke collection function provided in an embodiment of the present invention. Figure 2 yes Figure 1 The side view of the range hood shown is shown. Figure 3 yes Figure 1 The image shows a partial sectional view of the range hood. Figure 4 and Figure 5 yes Figure 1 The diagram shown is a structural schematic of the louver cavity mechanism in the range hood. (Refer to...) Figures 1-5 The range hood includes a smoke collection chamber 10, a first flap 20, and a louvered cavity mechanism 30. The smoke collection chamber 10 has a first air inlet 101 on its air inlet surface. The first flap 20 is rotatably connected to the smoke collection chamber 10; in the closed state, the first flap 20 seals the first air inlet 101, and in the open state, it forms a downward-facing opening with the smoke collection chamber 10. One end of the louvered cavity mechanism 30 is rotatably connected to the first flap 20, and the other end extends from the first air inlet 101 into the smoke collection chamber 10; the louvered cavity mechanism 30 includes a louvered air inlet 31 and multiple guide vanes 32; both ends of the guide vanes 32 are rotatably connected to the sides of the louvered air inlet 31. Specifically, the rotation axis of the first flap 20 extends in the left-right direction X, and the guide vanes 32 also extend in the left-right direction X. The side of the louvered cavity mechanism 30 is closed to the first air inlet 101 but can slide relative to it. The louvered air inlet 31 is located on the side surface of the louvered cavity mechanism 30 away from the smoke collection cavity 10 and the first flap 20.

[0028] As those skilled in the art will know, the smoke-collecting chamber 10 of a range hood is generally located above the stove. During cooking, the cooking appliance generates rising and diffused fumes. The smoke-collecting chamber 10 above can collect and absorb these fumes, which are then discharged outdoors. In this embodiment of the invention, the side of the smoke-collecting chamber 10 facing the stove is the air inlet surface, on which a first air inlet 101 is provided for capturing fumes. In addition to the smoke-collecting chamber 10, the range hood also includes a first flap 20, which can rotate relative to the smoke-collecting chamber 10. The rotation axis extends in the left-right direction X, indicating that the first flap 20 can be flipped up and down, thus having an open state and a closed state. In the closed state, the first flap 20 closes the first air inlet 101 on the smoke-collecting chamber 10, which can close the smoke-collecting chamber 10 when the user is not cooking, preventing fumes from flowing back into the room. When the fan 80 is activated, the first flap 20 and the smoke-collecting chamber 10 form a downward-facing opening, exposing the first air inlet 101. This allows the first flap 20 to collect smoke while the first air inlet 101 absorbs the fumes, preventing them from escaping. Furthermore, by adjusting the flip angle of the first flap 20 and the size of the downward-facing opening formed by the first flap 20 and the smoke-collecting chamber 10, different smoke-collecting effects can be achieved to adapt to different smoke conditions.

[0029] In addition, the range hood also includes a louvered cavity mechanism 30, which is essentially located inside the first air inlet 101. One end of the louvered cavity mechanism 30 is rotatably connected to the first flap 20, indicating that the louvered cavity mechanism 30 can extend and retract inwards at the first air inlet 101. When the first flap 20 is open, the louvered cavity mechanism 30 extends at least partially; when the first flap 20 is closed, the louvered cavity mechanism 30 retracts into the first air inlet 101. The louvered cavity mechanism 30 is responsible for controlling the area and direction of the fumes entering the first air inlet 101. The guide vane 32 within it can rotate relative to the louvered air inlet 31. It can be understood that when the guide vane 32 is parallel to the plane of the louvered air inlet 31, it can block the airflow of the louvered air inlet 31, thereby closing the louvered air inlet 31, that is, closing the first air inlet 101. When the guide vane 32 is tilted and forms a certain angle with the plane of the louvered air inlet 31, the oil fumes can be guided into the louvered air inlet 31. That is, the oil fumes are drawn into the smoke collection chamber 10 through the first air inlet 101. Furthermore, by adjusting the angle between the guide vane 32 and the plane of the louvered air inlet 31, the suction area and suction direction can be controlled, optimizing the oil fume capture capability and improving emission efficiency.

[0030] Continue to refer to Figure 1 In one specific embodiment, optionally, the louvered air inlet 31 includes a first louvered air inlet 311 and a second louvered air inlet 312, and the first louvered air inlet 311 and the second louvered air inlet 312 are arranged in the left-right direction X.

[0031] It is understandable that in a typical household kitchen, a stove usually has two burners, one on the left and one on the right. The range hood in this embodiment of the invention is designed for stoves with two burners, and can be equipped with two louvered air inlets 31, namely a first louvered air inlet 311 and a second louvered air inlet 312. Each of the two louvered air inlets 31 can be equipped with a guide vane 32, and each guide vane 32 can rotate independently relative to its respective louvered air inlet 31. Therefore, the opening and opening angle of a single louvered air inlet 31 can be controlled by the guide vane 32 to meet the fume capture requirements generated during cooking on either burner.

[0032] Continue to refer to Figure 1 and Figure 2 In this embodiment of the invention, the range hood may further include a flap driving mechanism 40, which is connected to the louver cavity mechanism 30 and is used to drive the louver cavity mechanism 30 to move and drive the first flap 20 to flip.

[0033] More specifically, the flap drive mechanism 40 includes a push rod motor 400, one end of which is movably connected to the inner wall of the smoke collection chamber 10, and the other end is movably connected to the louver cavity mechanism 30.

[0034] One end of the push rod motor 400 is movably connected to the inner wall of the smoke collection chamber 10, and the other end is connected to the louvered cavity mechanism 30. Through the extension and retraction of the push rod motor 400, supported by the inner wall of the smoke collection chamber 10, the louvered cavity mechanism 30 is driven to extend outward of the first air inlet 101. Since the louvered cavity mechanism 30 is movably connected to the first flap 20, the first flap 20 can be linked to achieve upward flipping. Thus, the push rod motor 400 can indirectly control the formation of an opening between the first flap 20 and the smoke collection chamber 10, and indirectly adjust the first flap 20 to the open state to open the first air inlet 101 for smoking.

[0035] Continue to refer to Figures 1-5 In this embodiment of the invention, the louver cavity mechanism 30 further includes a louver drive mechanism 33 and a transmission mechanism 34. The louver drive mechanism 33 is connected to the rotating shaft of the guide vane 32 through the transmission mechanism 34 and is used to drive the transmission mechanism 34 to drive the guide vane 32 to rotate.

[0036] More specifically, the venetian blind drive mechanism 33 includes a rotary motor 330. The transmission mechanism 34 includes a first rotating arm 341, a first connecting rod 342, a second connecting rod 343, and a plurality of second rotating arms 344. The rotating shaft of the rotary motor 330 extends in the left-right direction X. The first rotating arm 341, the first connecting rod 342, the second connecting rod 343, and the second rotating arms 344 are all perpendicular to the rotating shaft of the guide vane 32. The second connecting rod 343 extends along the arrangement direction of the guide vane 32, and the plurality of second rotating arms 344 are arranged sequentially along the arrangement direction of the guide vane 32.

[0037] The rotating shaft of the rotary motor 330 is fixedly connected to the first end of the first rotating arm 341. The second end of the first rotating arm 341 is movably connected to the first end of the first connecting rod 342. The second end of the first connecting rod 342 is movably connected to the second connecting rod 343. The second connecting rod 343 is movably connected to the first ends of a plurality of second rotating arms 344. The second ends of the plurality of second rotating arms 344 are fixedly connected to the rotating shafts of a plurality of guide vanes 32, one by one. The rotary motor 330 is used to drive the first rotating arm 341 to rotate around its first end, thereby sequentially driving the first connecting rod 342 to move, the second connecting rod 343 to move along the arrangement direction of the guide vanes 32, each second rotating arm 344 to rotate, and each guide vane 32 to rotate around its rotating shaft.

[0038] The rotary motor 330 provides power to drive the first rotating arm 341 to rotate. During the rotation of the first rotating arm 341, the first connecting rod 342 and the second connecting rod 343 will move freely in sync. Since the second connecting rod 343 is connected to multiple second rotating arms 344, the ends of the same side of the multiple second rotating arms 344 are all connected to the second connecting rod 343, and the ends of the other side are respectively connected to the rotating shafts of multiple guide vanes 32. This restricts the movement trajectory of the second connecting rod 343 to move back and forth in the arrangement direction of the multiple guide vanes 32. During the back and forth movement, the second rotating arm 344 drives each guide vane 32 to rotate. Thus, the rotary motor 330 can drive each guide vane 32 to flip, open the louvers and adjust the opening angle of the louvers.

[0039] Continue to refer to Figures 1-5 Alternatively, the louver drive mechanism 33 and the transmission mechanism 34 are disposed on one side of the guide vane 32 in the left-right direction X.

[0040] It should be noted that, in this embodiment of the invention, when two louvered air inlets are provided on the left and right sides, the flap driving mechanism 40 used to drive the first flap 20 can be connected between the two louvered air inlets. Meanwhile, the louvered driving mechanism 33 and the transmission mechanism 34 used to drive the guide vanes 32 in each louvered air inlet can be respectively located on opposite sides of the two louvered air inlets, thereby avoiding the flap driving mechanism 40 and achieving a reasonable layout.

[0041] Continue to refer to Figures 1-3 Optionally, the smoke collection chamber 10 is further provided with a second air inlet 102 on its air inlet surface, which is located below the first air inlet 101. The range hood also includes a second flap 50, which is fixedly connected to the smoke collection chamber 10. The second flap 50 and the smoke collection chamber 10 form an upward opening, and the second air inlet 102 is located within the opening formed by the second flap 50 and the smoke collection chamber 10.

[0042] The second air inlet 102 and the second flap 50 constitute another air intake structure of the smoke collection chamber 10. It is located below the air intake structure composed of the first air inlet 101 and the first flap 20. As the oil fumes gradually rise, some of them are preferentially drawn into the smoke collection chamber 10 at a lower position. When they rise to the position of the air intake structure composed of the first air inlet 101 and the first flap 20, the oil fumes rise a greater distance and have a larger diffusion area. Therefore, it is necessary to set up an adjustable first flap 20 and a louver cavity mechanism 30 to collect the smoke and achieve efficient capture of oil fumes.

[0043] Furthermore, it should be added that the range hood in this embodiment of the invention, in addition to having a smoke collection chamber 10, a first flap 20, a second flap 50, and their driving mechanism, also has corresponding conventional structures. It can be understood that the smoke collection chamber 10 of the range hood needs to be connected to the main unit 60 to form an air duct. The main unit 60 is connected to the external flue (not shown in the figure) through a check valve 70 to prevent backflow of fumes. A fan 80 is installed in the main unit 60, which provides the suction power and generates negative pressure in the smoke collection chamber 10 through the air duct, thereby creating a pressure difference between the smoke collection chamber 10 and the outside, allowing fumes to enter the air duct through the first air inlet 101 and the second air inlet 102, and then be discharged to the external flue. In addition, considering that when the fumes are drawn into the smoke collection chamber 10, they will collide and accumulate with the air inlet surface of the smoke collection chamber 10, the louvered cavity mechanism 30 and the second flap 50, an oil cup 90 can be connected to the lower end of the smoke collection chamber 10 to receive the oil droplets that flow downward and drip from the air inlet surface of the smoke collection chamber 10, the louvered cavity mechanism 30 and the second flap 50, so as to keep the user's stove clean.

[0044] Based on the same inventive concept, the present invention also provides a control method for a range hood. Figure 6 This is a flowchart of a control method for a range hood provided in an embodiment of the present invention, see reference. Figures 1-6 The control method for this range hood can be applied to the range hood in any embodiment of the present invention. Specifically, it can be executed by a control device integrated into the range hood, which can be implemented by software and / or hardware. The range hood can specifically be a side-suction type range hood. The control method may specifically include: S110. Detect the concentration of oil fumes at the air inlet surface of the smoke collection chamber.

[0045] As mentioned earlier, the side of the smoke collection chamber 10 facing the stove is the air intake surface, on which a first air inlet 101 is installed to absorb and capture cooking fumes. In this step, detecting the concentration of cooking fumes at the air intake surface of the smoke collection chamber 10 can characterize the actual amount of cooking fumes generated during the cooking process and also reflect the amount of cooking fumes that the range hood needs to capture. Specifically, a cooking fume concentration sensor, such as a PM2.5 particulate matter concentration sensor, can be installed at a suitable location on the air intake surface of the smoke collection chamber 10 to collect and detect the cooking fume concentration at the air intake surface.

[0046] Furthermore, in actual testing, this step can be further refined as follows: periodically detect the oil fume concentration at the air inlet surface of the smoke collection chamber at preset time intervals. For example, the oil fume concentration can be collected every n seconds, where n is a preset positive integer, such as 1 second or 3 seconds. Moreover, after the actual testing, the detection signal can be filtered to eliminate transient interference and ensure the accuracy of the oil fume concentration detection.

[0047] S120. Adjust the opening angle of the first flap relative to the smoke collection chamber according to the concentration of oil fumes.

[0048] It is understandable that the higher the concentration of cooking fumes, the faster they disperse and the higher the probability of escape. This step corresponds to adjusting the opening angle of the first flap 20 relative to the smoke-collecting chamber 10 based on the concentration of cooking fumes. In essence, the first flap 20 is used as a smoke-collecting plate, and the unfolding angle of the smoke-collecting plate is adjusted. This can adapt to the concentration of cooking fumes, achieve a suitable and effective smoke-collecting effect, capture cooking fumes in time, and prevent them from dispersing to other areas.

[0049] S130, Obtain the fan speed of the range hood.

[0050] It's understandable that users will turn on different range hood settings or power levels when cooking different types of food to adapt to the fumes produced by that cooking method and provide appropriate suction power. Different range hood settings or power levels result in different fan speeds, thus providing different levels of suction power. This step, by obtaining the range hood's fan speed, can reflect the current suction power of the range hood.

[0051] S140. Adjust the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the oil fume concentration and fan speed.

[0052] Those skilled in the art will understand that, due to the relatively dispersed direction of oil fume diffusion, the louvered air inlet 31 of the louvered cavity mechanism 30 cannot be perfectly aligned with the path of oil fume diffusion. At the same oil fume concentration, different suction levels provided by the range hood will cause changes in the absorption path of the oil fume, resulting in different angles at which the oil fume enters the louvered air inlet 31. Simultaneously, when the range hood provides the same suction level, the efficiency of oil fume diffusion varies at different oil fume concentrations, which will also affect the absorption path of the oil fume, causing changes in the angle at which the oil fume enters the louvered air inlet 31. Furthermore, due to varying oil fume concentrations, the opening angle of the first flap 20 needs to be adjusted in step S120. Due to the special structural design, the opening of the first flap 20 is controlled by transmitting power through the louver cavity mechanism 30. During the adjustment of the first flap 20, the extension of the louver cavity mechanism 30 from inside the first air inlet 101 to the outside will change, resulting in different postures of the louver cavity mechanism 30 and thus changing the angle of the louver air inlet 31. Consequently, the angle adjustment of the first flap 20 indirectly affects the angle of the louver air inlet 31 under different oil fume concentrations, thus affecting the angle at which oil fumes enter the louver air inlet 31.

[0053] In summary, the suction power provided by the range hood, the concentration of oil fumes, and the angle of the first flap 20 all affect the angle at which oil fumes enter the louvered air inlet 31, generating unnecessary resistance. Based on this, in step S140, the angle at which oil fumes enter the louvered air inlet 31 can be determined according to the oil fume concentration and the fan speed. Then, at the determined angle at which oil fumes enter the louvered air inlet 31, by adjusting the tilt angle of the guide vane 32 relative to the louvered air inlet 31, the tilted guide vane 32 can be used to guide the oil fume airflow, allowing the oil fumes to smoothly enter the louvered air inlet 31, reducing flow resistance, and improving the oil fume capture efficiency in conjunction with the smoke-gathering effect of the first flap 20.

[0054] The above technical solution, by detecting the concentration of oil fumes at the air inlet of the smoke-collecting chamber and then adjusting the opening angle of the first flap relative to the smoke-collecting chamber based on the oil fume concentration, can adapt to the oil fume concentration, achieving a suitable smoke-collecting area and angle, and preventing oil fumes from escaping. Furthermore, by acquiring the fan speed of the range hood and adjusting the tilt angle of the guide vanes in the louver cavity structure relative to the louver air inlet based on the oil fume concentration and fan speed, it can adapt to the range hood's power and the size of the oil fumes, adapting to the oil fume's suction path, providing path guidance, and allowing the oil fumes to smoothly enter the louver air inlet, reducing suction resistance. Using the above method, the embodiments of the present invention can solve the problem of poor oil fume capture efficiency caused by the fixed smoke-collecting structure and fixed suction angle of existing range hoods. It can adapt to the actual oil fume state and range hood state, providing a suitable smoke-collecting effect and a suitable suction angle, improving oil fume capture efficiency, and enhancing the user experience.

[0055] Based on the above embodiments, modified embodiments of the above embodiments are proposed. It should be noted that, in order to keep the description brief, only the differences from the above embodiments are described in the modified embodiments.

[0056] In one embodiment, optionally, before S110, detecting the oil fume concentration at the air inlet surface of the smoke collection chamber, the following step can be set: S100, adjusting the opening angle of the first flap relative to the smoke collection chamber to the initial opening angle.

[0057] Before detecting the oil fume concentration, step S100 opens the first flap 20 to its initial angle. This can be understood as the pre-start operation of the range hood, ensuring that the first air inlet 101 of the smoke collection chamber 10 is open, allowing for the absorption of oil fumes and providing basic smoke capture capabilities. Based on this, the opening angle of the first flap 20 is adaptively adjusted according to the real-time oil fume concentration to achieve customized smoke collection effects. The initial opening angle can be a small angle, gradually increasing as the actual oil fume concentration is detected. Alternatively, the initial opening angle can be a medium angle, suitable for medium oil fume concentrations. When the actual oil fume concentration is low, the angle of the first flap 20 can be slightly decreased; when the actual oil fume concentration is high, the angle can be slightly increased. This reduces the range of motion of the first flap 20 during cooking, preventing excessive movement and potential collisions with the user, thus providing a better user experience.

[0058] In one embodiment, optionally, step S120, adjusting the opening angle of the first flap relative to the smoke-gathering chamber according to the oil fume concentration, can specifically be: S121. Based on the preset fume concentration range, adjust the opening angle of the first flap relative to the fume collection chamber to the preset opening angle corresponding to the preset fume concentration range; wherein, the preset fume concentration range and the corresponding preset opening angle are positively correlated.

[0059] It is understandable that, to simplify the control strategy of the first flap 20 based on the concentration of cooking fumes, a limited number of fume concentration ranges can be divided according to the magnitude of the fume concentration, thereby allowing the first flap 20 to have a limited number of opening angle settings. For example, a maximum fume concentration C can be preset. When the fume concentration is less than 30%C, it can indicate that the current cooking type is soup making or no cooking. When the fume concentration is in the range of 31% to 60%C, it can indicate that the current cooking type is stir-frying or slow cooking. When the fume concentration is 61%C or above, it can indicate that the current cooking type is high-heat stir-frying or deep-frying. The three preset fume concentration ranges mentioned above correspond to different preset opening angles of the first flap 20. When the fume concentration is less than 30%C, the opening angle of the first flap 20 can be set to θ1; when the fume concentration is in the range of 31-60%C, the opening angle of the first flap 20 can be set to θ2; and when the fume concentration is 61%C or above, the opening angle of the first flap 20 can be set to θ3, where θ1 < θ2 < θ3. Based on this, the initial opening angle of the first flap 20 in step S100 can be set to θ2.

[0060] In another embodiment, optionally, step S120, adjusting the opening angle of the first flap relative to the smoke-gathering chamber according to the oil fume concentration, can also be: S1221. According to the preset conversion coefficient between the opening angle adjustment amount and the change in oil fume concentration, calculate the target opening angle adjustment amount of the first flap relative to the smoke-closing chamber based on the real-time change in oil fume concentration.

[0061] S1222. Adjust the opening angle of the first flap relative to the smoke-gathering chamber according to the target opening angle adjustment amount.

[0062] Steps S1221 and S1222 described above represent another control scheme for adjusting the opening angle of the first flap 20. By setting a preset conversion coefficient between the change in oil fume concentration and the adjustment of the opening angle, the opening angle of the first flap 20 can be controlled to change accordingly when the oil fume concentration changes, thus achieving adaptive adjustment. For example, the preset conversion coefficient can be 5° / 10%, meaning that based on a given oil fume concentration and corresponding opening angle, for every 10% increase in actual oil fume concentration, the opening angle of the first flap 20 can be increased by 5°, and for every 10% decrease in actual oil fume concentration, the opening angle of the first flap 20 can be decreased by 5°.

[0063] In one embodiment, considering that the first flap 20 may get mechanically stuck during the flipping process, a limit protection can be set, that is, the opening angle θ of the first flap 20 relative to the smoke gathering chamber 10 can be set to satisfy: 30°≤θ≤75°.

[0064] Figure 7 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention, for reference. Figure 7 This embodiment is a refinement based on the above embodiment. Based on the above embodiment, regarding S140, adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the oil fume concentration and fan speed can be refined into the following steps: From the preset database, retrieve the preset tilt angle of the guide vane relative to the louver air inlet, which corresponds to the preset oil fume concentration range and the preset fan speed range, and use it as the target tilt angle. Adjust the tilt angle of the guide vane relative to the louvered air inlet to the target tilt angle.

[0065] For details not covered in this embodiment, please refer to the previous embodiment.

[0066] like Figure 7 As shown, the control method of this range hood includes the following steps: S210. Detect the concentration of oil fumes at the air inlet surface of the smoke collection chamber.

[0067] S220. Adjust the opening angle of the first flap relative to the smoke collection chamber according to the concentration of oil fumes.

[0068] S230: Obtain the fan speed of the range hood.

[0069] S241. From the preset database, retrieve the preset tilt angle of the guide vane relative to the louvered air inlet, which corresponds to the preset oil fume concentration range where the oil fume concentration is located and the preset fan speed range where the fan speed is located, and use it as the target tilt angle.

[0070] S242. Adjust the tilt angle of the guide vane relative to the louvered air inlet to the target tilt angle.

[0071] As mentioned earlier, both the concentration of cooking fumes and the fan speed affect the angle at which the fumes enter the louvered air inlet 31. Therefore, given a specific concentration of cooking fumes and fan speed, a specific path for the fumes exists. Based on this, by conducting experiments and simulations beforehand, the actual path of the cooking fumes, i.e., the angle at which they enter the louvered air inlet 31, can be detected and determined under different concentrations of cooking fumes and different fan speeds. Thus, the data on the concentration of cooking fumes, the fan speed, and the angle at which the fumes enter can be linked and pre-stored to form a preset database. During the operation of the range hood, after determining the concentration of cooking fumes and the fan speed, the angle at which the fumes enter the louvered air inlet 31 can be retrieved from the preset database. This allows for the control of the guide vane 32 to be parallel to the angle at which the fumes enter the louvered air inlet 31, thus guiding the flow and reducing flow resistance, thereby improving the efficiency of fume capture.

[0072] Of course, to simplify the experimental or simulation process, save data volume and storage space, and simplify the control complexity of the guide vane, this embodiment can consider dividing the oil fume concentration and fan speed into a finite number of preset intervals for experiments or simulations, forming a preset database. In actual operation, it is only necessary to determine the preset oil fume concentration interval and the preset fan speed interval to find the target tilt angle that the guide vane 32 needs to be adjusted. Then, by adjusting the angle of the guide vane 32 to the target tilt angle, it can be made to conform to the path of oil fume entering the louvered air inlet 31, reducing flow resistance and improving oil fume capture efficiency.

[0073] For ease of understanding, the present invention provides a specific example: Under low oil fume concentration and low fan speed, the opening angle of the first flap 20 relative to the smoke collection chamber 10 should be 30°, and the tilt angle of the guide vane 32 relative to the louvered air inlet 31 should be 25°; under medium oil fume concentration and low fan speed, the opening angle of the first flap 20 relative to the smoke collection chamber 10 should be 45°, and the tilt angle of the guide vane 32 relative to the louvered air inlet 31 should be 45°; under high oil fume concentration and low fan speed, the opening angle of the first flap 20 relative to the smoke collection chamber 10 should be 75°, and the tilt angle of the guide vane 32 relative to the louvered air inlet 31 should be 90°.

[0074] Continue to refer to Figures 1-3 In an embodiment of the present invention, applicable to a stove with two burners on the left and right sides, the louvered air inlet 31 may include a first louvered air inlet 311 and a second louvered air inlet 312, the first louvered air inlet 311 and the second louvered air inlet 312 being arranged along the left-right direction X. Based on this, the present invention also provides a control method for a range hood.

[0075] Figure 8 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention, see reference. Figure 8 Based on the above embodiment, before adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the oil fume concentration and fan speed in S140, the following step can be added: Determine which burner to start; Based on this, S140, adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the oil fume concentration and fan speed, can specifically include: The first and / or second louvered air inlets located on the same side as the burner head being started are identified as the target louvered air inlets. Adjust the tilt angle of the guide vanes in the target louver air inlet relative to the target louver air inlet based on the concentration of oil fumes and the fan speed.

[0076] For details not covered in this embodiment, please refer to the embodiments described above.

[0077] like Figure 8 As shown, the control method of this range hood includes the following steps: S310. Detect the concentration of oil fumes at the air inlet surface of the smoke collection chamber.

[0078] S320. Adjust the opening angle of the first flap relative to the smoke collection chamber according to the concentration of oil fumes.

[0079] S330: Obtain the fan speed of the range hood.

[0080] S340, Select the burner to start.

[0081] S351. The first and / or second louvered air inlets on the same side of the burner head to be started are identified as the target louvered air inlets.

[0082] S352. Adjust the tilt angle of the guide vanes in the target louver air inlet relative to the target louver air inlet according to the oil fume concentration and fan speed.

[0083] The aforementioned steps S340-S352 are essentially adapted to stoves with burners on both the left and right sides, providing control logic for range hoods with louvered air inlets 31 on both the left and right sides. It's easy to understand that when using a stove with two burners, users may only use one burner for cooking. Since the range hood's smoke collection chamber 10 is typically adapted to both burners, if the range hood is operated as if it were used for dual-burner cooking, it wouldn't be able to effectively absorb the fumes generated on one side, reducing its capture efficiency. In this embodiment, by determining which burner is activated, it can determine which side's louvers need to be opened, i.e., which side's air inlet 31's guide vanes 32 need to be opened and adjusted, while the other side's louvered air inlet 31 can be closed, allowing the louvers on the activated burner side to specifically capture the fumes on that side. It is understandable that opening only the louvered air inlet 31 on the same side can not only ensure that the louvered air inlet 31 is aligned with the rising oil fumes on the same side and shorten the capture path, but also increase the static pressure of the louvered air inlet 31 on one side and improve the oil fume absorption power, thereby improving the capture efficiency of oil fumes on one side.

[0084] In addition, regarding the method of determining the burner to be started in S340, for example, the temperature of the left and right burners can be collected by setting a temperature sensor to determine whether the burner is started. Alternatively, the burner to be started can be determined by the concentration of oil fumes on the left and right sides. Or it can be determined by setting a burner start sensor in conjunction with the cooktop. No further restrictions are imposed here.

[0085] Figure 9 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention, such as... Figure 9 As shown, the present invention also provides a relatively complete and detailed implementation process, which may include the following specific steps: S41, Range hood starts.

[0086] S42, the first flap opens to the initial position.

[0087] After the range hood is started manually or automatically, the main control chip initializes all sensors, push rod motor 400, and fan 80. The push rod motor 400 starts and drives the first flap 20 to open to the system's preset initial position, that is, the opening angle relative to the smoke collection chamber 10 is the initial opening angle.

[0088] S43. Identify the start-up status of the stove and open the corresponding air inlet.

[0089] The system identifies the cooktop status and opens the corresponding top-side air inlet. Real-time detection via the cooktop activation sensor enables zoned control. If only the left burner is activated, the rotary motor 330 corresponding to the left louver starts, rotating the guide vane 32 to open the left louver air inlet 31, while the right louver air inlet 31 closes. If only the right burner is activated, the rotary motor 330 corresponding to the right louver starts, rotating the guide vane 32 to open the right louver air inlet 31, while the left louver air inlet 31 closes. When both burners are activated simultaneously, both left and right louver air inlets 31 open. When no burner is activated, both left and right louver air inlets 31 close.

[0090] S44. Real-time collection of oil fume concentration and dynamic adjustment of the position of the first flap.

[0091] The oil fume concentration at the air inlet of the smoke collection chamber 10 is collected in real time. Specifically, an oil fume concentration sensor can be used to collect the oil fume concentration value once every n seconds and output standardized data. The position of the first flap 20 is dynamically adjusted according to the oil fume concentration. A closed-loop adjustment of the concentration angle can be adopted, and the position is not fixed. The first flap 20 automatically adapts to the oil fume concentration. At low concentration, the opening angle of the first flap 20 relative to the smoke collection chamber 10 is n1, which can reduce the smoke inlet area, increase the local wind speed, and save energy and reduce noise. At medium concentration, the opening angle of the first flap 20 relative to the smoke collection chamber 10 is n2 (which can be set to the initial opening angle preset by the system), which can balance the air inlet area and suction power and is suitable for regular cooking. At high concentration, the opening angle of the first flap 20 relative to the smoke collection chamber 10 is n3 (fully open), which can maximize the smoke inlet space and quickly accommodate a large amount of oil fume. In addition, another dynamic adjustment scheme can be adopted according to the concentration of cooking fumes. For example, compared with the preset concentration, if the concentration increases, the push rod motor 400 drives the first flap 20 to gradually increase the angle. For example, for every 10% increase in concentration, the opening angle of the first flap 20 increases by 5°; if the concentration decreases, the push rod motor 400 drives the first flap 20 to gradually decrease the angle. For example, for every 10% decrease in concentration, the opening angle of the first flap 20 decreases by 5°. The opening angle of the first flap 20 can be limited and protected, with a minimum of 30° and a maximum of 75°, thereby preventing mechanical jamming.

[0092] S45. Adjust the angle of the guide vanes according to the concentration of oil fumes and the fan speed.

[0093] This step involves adjusting the angle of the guide vane 32 of the louver using a dual-factor method. The angle of the guide vane 32 does not solely depend on the concentration of cooking fumes; it also needs to be matched with the fan speed to ensure that the angle of the guide vane 32 is parallel to the path of the cooking fumes, thereby reducing flow resistance. Specifically, the angle of the guide vane 32 can be obtained by accessing a database. For example: For soup cooking mode (low concentration) + low fan speed: the first flap 20 is at 30° relative to the smoke collection chamber 10, and the guide vane 32 is at 25° relative to the louver air inlet 31; For frying / stir-frying mode (medium concentration) + low fan speed: the first flap 20 is at 45° relative to the smoke collection chamber 10, and the guide vane 32 is at 45° relative to the louver air inlet 31; For stir-frying mode (high concentration) + low fan speed: the first flap 20 is at 75° relative to the smoke collection chamber 10, and the guide vane 32 is at 90° relative to the louver air inlet 31.

[0094] S46. Automatic reset and shutdown when cooking is finished.

[0095] When the range hood is detected to be off, the first flap 20 and the guide vane 32 can be controlled respectively to reset the first flap 20 to the off state and make the guide vane 32 parallel to the plane where the louvered air inlet 31 is located.

[0096] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A range hood with dynamic smoke collection function, characterized in that, include: The smoke collection chamber (10) has a first air inlet (101) on its air inlet surface. The first flap (20) is rotatably connected to the smoke collection chamber (10), and in the closed state, it closes the first air inlet (101), and in the open state, it forms a downward opening with the smoke collection chamber (10); The louver cavity mechanism (30) is rotatably connected at one end to the first flap (20), and the other end extends from the first air inlet (101) into the smoke collection cavity (10); The louver cavity mechanism (30) includes a louver air inlet (31) and a plurality of guide vanes (32); the two ends of the guide vanes (32) are respectively rotatably connected to the side of the louver air inlet (31).

2. The range hood according to claim 1, characterized in that, The louvered air inlet (31) includes a first louvered air inlet (311) and a second louvered air inlet (312), which are arranged in the left-right direction.

3. The range hood according to claim 1, characterized in that, The louver cavity mechanism (30) further includes a louver drive mechanism (33) and a transmission mechanism (34). The louver drive mechanism (33) is connected to the rotating shaft of the guide vane (32) through the transmission mechanism (34) and is used to drive the transmission mechanism (34) to drive the guide vane (32) to rotate.

4. The range hood according to claim 3, characterized in that, The louver drive mechanism (33) includes a rotary motor (330); the transmission mechanism (34) includes a first rotating arm (341), a first connecting rod (342), a second connecting rod (343), and a plurality of second rotating arms (344). The rotating shaft of the rotary motor (330) extends in the left-right direction. The first rotating arm (341), the first connecting rod (342), the second connecting rod (343), and the second rotating arm (344) are all perpendicular to the rotating shaft of the guide vane (32). The second connecting rod (343) extends along the arrangement direction of the guide vane (32), and the plurality of second rotating arms (344) are arranged sequentially along the arrangement direction of the guide vane (32). The rotating shaft of the rotary motor (330) is fixedly connected to the first end of the first rotating arm (341); The second end of the first rotating arm (341) is movably connected to the first end of the first connecting rod (342); The second end of the first link (342) is movably connected to the second link (343); The second connecting rod (343) is movably connected to the first end of the plurality of second rotating arms (344); The second ends of the plurality of second rotating arms (344) are fixedly connected to the rotating shafts of the plurality of guide vanes (32) in a one-to-one correspondence; The rotary motor (330) is used to drive the first rotating arm (341) to rotate around the first end, so as to drive the first connecting rod (342) to move in sequence, the second connecting rod (343) to move along the arrangement direction of the guide vanes (32), each of the second rotating arms (344) rotates, and each of the guide vanes (32) rotates around the rotating shaft.

5. The range hood according to claim 3, characterized in that, The louver drive mechanism (33) and the transmission mechanism (34) are located on one side of the guide vane (32) in the left-right direction.

6. The range hood according to claim 1, characterized in that, The air inlet surface of the smoke collection chamber (10) is also provided with a second air inlet (102), which is located below the first air inlet (101); The range hood also includes a second flap (50), which is fixedly connected to the smoke collection chamber (10). The second flap (50) and the smoke collection chamber (10) form an upward opening, and the second air inlet (102) is located in the opening formed by the second flap (50) and the smoke collection chamber (10).

7. A control method for a range hood, characterized in that, Applied to the range hood as described in any one of claims 1-6; the control method includes: The concentration of oil fumes at the air inlet surface of the smoke collection chamber is detected; Adjust the opening angle of the first flap relative to the smoke collection chamber according to the oil fume concentration; Obtain the fan speed of the range hood; The tilt angle of the guide vane in the louver cavity mechanism relative to the louver air inlet is adjusted according to the oil fume concentration and the fan speed.

8. The control method according to claim 7, characterized in that, Adjusting the opening angle of the first flap relative to the smoke collection chamber according to the oil fume concentration includes: Based on the preset fume concentration range in which the fume concentration is located, the opening angle of the first flap relative to the fume collection chamber is adjusted to a preset opening angle corresponding to the preset fume concentration range; wherein, the preset fume concentration range and the corresponding preset opening angle are positively correlated.

9. The control method according to claim 7, characterized in that, Adjusting the opening angle of the first flap relative to the smoke collection chamber according to the oil fume concentration includes: According to the preset conversion coefficient between the opening angle adjustment amount and the change in oil fume concentration, the target opening angle adjustment amount of the first flap relative to the smoke collection chamber is calculated based on the real-time change in oil fume concentration. The opening angle of the first flap relative to the smoke collection chamber is adjusted according to the target opening angle adjustment amount.

10. The control method according to claim 7, characterized in that, The opening angle θ of the first flap relative to the smoke collection chamber satisfies: 30°≤θ≤75°.

11. The control method according to claim 7, characterized in that, Adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the oil fume concentration and the fan speed includes: From the preset database, retrieve the preset tilt angle of the guide vane relative to the louver air inlet, which corresponds to the preset oil fume concentration range where the oil fume concentration is located and the preset fan speed range where the fan speed is located, and use it as the target tilt angle. Adjust the tilt angle of the guide vane relative to the louvered air inlet to the target tilt angle.

12. The control method according to claim 7, characterized in that, The louvered air inlet includes a first louvered air inlet and a second louvered air inlet, which are arranged in a left-right direction. Before adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet based on the oil fume concentration and the fan speed, the method further includes: Determine which burner to start; Adjusting the tilt angle of the guide vanes in the louver cavity mechanism relative to the louver air inlet according to the oil fume concentration and the fan speed includes: The first louvered air inlet and / or the second louvered air inlet located on the same side as the burner head being started are identified as the target louvered air inlet. Adjust the tilt angle of the guide vane in the target louver air inlet relative to the target louver air inlet based on the oil fume concentration and the fan speed.

13. The control method according to claim 7, characterized in that, Detecting the oil fume concentration at the air inlet surface of the smoke collection chamber includes: The concentration of oil fumes at the air inlet surface of the smoke collection chamber is periodically detected at preset time intervals.

14. The control method according to claim 7, characterized in that, Before detecting the oil fume concentration at the air inlet surface of the smoke collection chamber, the method further includes: Adjust the opening angle of the first flap relative to the smoke collection chamber to the initial opening angle.

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