Hidden range hood and control method thereof

Abstract

The invention discloses a hidden range hood and a control method thereof. The control method comprises the following steps: acquiring oil smoke concentrations of the front side, the left side and the right side of the range hood, which are respectively acquired by three oil smoke concentration sensors in real time; according to the oil smoke concentration of the front side, the left side and the right side of the range hood, the telescopic length of each telescopic unit is adjusted in real time so as to change the distance and / or the inclined posture of the smoke baffle relative to the smoke inlet. The oil smoke concentration sensors are used for collecting the real-time oil smoke concentration of the front side, the left side and the right side of the range hood, the telescopic length of each telescopic unit in the range hood is adjusted in real time according to the real-time oil smoke concentration, and therefore the distance and / or the inclined posture of the smoke baffle relative to the smoke inlet are / is changed, and the air speed distribution of the air inlet area is changed; the problem of multi-directional oil fume dynamic capture is solved, the oil fume suction effect of each area is effectively improved, and oil fume diffusion is prevented.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to a concealed range hood and its control method. Background Technology

[0002] Traditional range hoods have limited functionality in their smoke guide plates, typically offering only simple opening and closing or a fixed-angle airflow guidance. Furthermore, the airflow distribution at the inlet is relatively fixed, failing to accurately capture and guide the fumes generated in the cooktop area. In actual use, the position of the cookware on the cooktop, the height of the cookware, the cooking method (such as frying, stir-frying, stewing, and boiling), and the amount and direction of fume generation and diffusion are all dynamic. When dealing with the large amounts of non-steady-state fumes generated by activities like stir-frying, a fixed smoke collection chamber cannot achieve optimal fume capture for all conditions, resulting in unsatisfactory fume extraction performance.

[0003] Existing technologies include some adjustable smoke baffles, but their adjustment dimension is usually limited to rotation in a single direction, resulting in a limited adjustment range and an inability to form an optimal aerodynamic envelope. Although some designs allow for height adjustment and concealment, their adjustment and concealment functions are usually independent, leading to complex structures and an inability to achieve dynamic adjustment at any angle in all directions to adapt to complex oil fume diffusion conditions.

[0004] Furthermore, current range hoods generally employ a simple fan speed control strategy based on speed settings, which suffers from slow response and high energy consumption. Traditional methods rely solely on manual switching by the user or on adjustments based on a single signal of smoke concentration, failing to accurately match the rapidly changing cooking conditions and often resulting in insufficient smoke extraction or excessive fan power. Summary of the Invention

[0005] This invention provides a concealed range hood and its control method, which can change the tilt posture of the smoke baffle according to the concentration of oil fumes, thereby changing the wind speed distribution in the air intake area, solving the problem of dynamic capture of oil fumes in multiple directions, and effectively improving the oil fume extraction effect in each area.

[0006] In a first aspect, the present invention provides a control method for a concealed range hood, the range hood comprising a main unit housing, a smoke baffle, and a lifting drive mechanism; a smoke inlet is provided on the lower surface of the main unit housing; the lifting drive mechanism comprises four telescopic units, one end of each telescopic unit being fixed to the inner wall of the main unit housing, and the other end being rotatably connected to four connection points on the smoke baffle in a one-to-one correspondence; the connecting lines of the two opposite connection points intersect; the four telescopic units can extend and retract longitudinally respectively;

[0007] The range hood also includes three oil fume concentration sensors, which are located on the lower surface of the main unit and on the front, left, and right sides of the smoke inlet.

[0008] Control methods include:

[0009] The oil fume concentrations at the front, left, and right sides of the range hood are collected in real time by three oil fume concentration sensors.

[0010] Based on the concentration of cooking fumes on the front, left, and right sides of the range hood, the extension length of each telescopic unit is adjusted in real time to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet.

[0011] Optionally, the four connection points include two front connection points and two back connection points; the front connection points are located in front of the back connection points; the two front connection points and the two back connection points are connected in sequence to form a rectangle;

[0012] One end of each of the two telescopic units located on the front side is fixed to the inner front wall of the main unit chassis, and the other end is rotatably connected to two front connection points; one end of each of the two telescopic units located on the rear side is fixed to the inner rear wall of the main unit chassis, and the other end is rotatably connected to two rear connection points.

[0013] Based on the concentration of cooking fumes on the front, left, and right sides of the range hood, the extension length of each telescopic unit is adjusted in real time to change the distance and / or tilt of the baffle plate relative to the smoke inlet, including:

[0014] Based on the concentration of cooking fumes at the front of the range hood, the extension lengths of the two telescopic units located at the front are adjusted in real time to change the forward and backward tilt of the baffle plate relative to the smoke inlet.

[0015] Optionally, based on the concentration of cooking fumes at the front of the range hood, the extension lengths of the two telescopic units located at the front are adjusted in real time to change the forward and backward tilt of the baffle plate relative to the smoke inlet, including:

[0016] When the oil fume concentration at the front of the range hood is greater than the first concentration threshold and the rate of change of the oil fume concentration at the front is greater than the first concentration change rate threshold, the two telescopic units located at the front are controlled to extend by a first preset distance to increase the distance between the front edge of the baffle and the smoke inlet.

[0017] When the oil fume concentration at the front of the range hood is less than or equal to the first concentration threshold and / or the rate of change of the oil fume concentration at the front is less than or equal to the first rate of change threshold, the current extension and retraction amount of each extension unit is maintained.

[0018] Optionally, the extension length of each telescopic unit is adjusted in real time according to the concentration of cooking fumes on the front, left, and right sides of the range hood to change the distance and / or tilt of the baffle plate relative to the smoke inlet. This also includes:

[0019] Based on the oil fume concentration on the left and right sides of the range hood, the extension length of the two telescopic units on the left or right side is adjusted in real time to change the left and right tilt posture of the baffle plate relative to the smoke inlet.

[0020] Optionally, based on the concentration of cooking fumes on the left and right sides of the range hood, the extension lengths of the two telescopic units on the left or right side are adjusted in real time to change the left-right tilt of the baffle relative to the smoke inlet, including:

[0021] Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood;

[0022] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, the current extension and retraction amount of each extension unit is maintained.

[0023] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, and the oil fume concentration on the left is greater than the oil fume concentration on the right, the two telescopic units on the left side are controlled to extend by a second preset distance to increase the average distance between the left edge of the baffle and the smoke inlet.

[0024] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, and the oil fume concentration on the right side is greater than the oil fume concentration on the left side, the two telescopic units on the right side are controlled to extend by a second preset distance to increase the average distance between the right edge of the baffle plate and the smoke inlet.

[0025] Optionally, the extension length of each telescopic unit is adjusted in real time according to the concentration of cooking fumes on the front, left, and right sides of the range hood to change the distance and / or tilt of the baffle plate relative to the smoke inlet. This also includes:

[0026] Based on the oil fume concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, the extension lengths of the two extension units on the left and the two extension units on the right are adjusted in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet.

[0027] Optionally, based on the smoke concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, the extension lengths of the two telescopic units on the left and two telescopic units on the right are adjusted in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet, including:

[0028] Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood;

[0029] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, the current extension and retraction amount of each extension unit is maintained.

[0030] When the absolute value of the difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, the two extension units on the side with the higher oil fume concentration are extended by the same amount of extension, while the two extension units on the side with the lower oil fume concentration are shortened.

[0031] Optionally, the telescopic unit includes a linear motor and a first support arm; the linear motor is fixed to the inner wall of the main unit housing, the first support arm is fixedly connected to the moving part of the linear motor, and the extension direction of the first support arm is parallel to the extension direction of the guide rail of the linear motor.

[0032] The telescopic unit also includes a first ball joint, a second ball joint, and a second support arm; the base of the first ball joint is fixed at the connection point, the ball head of the first ball joint is fixed at one end of the second support arm, the base of the second ball joint is fixed at the other end of the second support arm, and the ball head of the second ball joint is fixed at the end of the first support arm away from the linear motor.

[0033] When the absolute value of the concentration difference between the left and right sides of the range hood exceeds a preset concentration difference threshold, the two extension units on the side with the higher concentration of oil fumes extend by the same amount, while the two extension units on the side with the lower concentration of oil fumes shorten, including:

[0034] When the absolute value of the concentration difference between the left and right sides of the range hood exceeds a preset concentration difference threshold, the system will automatically adjust the concentration based on the absolute value of the concentration difference between the left and right sides of the range hood. and formula Calculate the target tilt angle Where k is the preset conversion coefficient;

[0035] According to the formula Calculate the expansion / contraction amount ;in, The length of the second support arm. The horizontal distance between the two front connection points or the two rear connection points when the smoke baffle is in a horizontal position;

[0036] When the oil fume concentration on the left is greater than that on the right, the two telescopic units on the left are controlled to extend and the two telescopic units on the right are controlled to shorten, according to the extension and contraction amount.

[0037] When the oil fume concentration on the right side is greater than that on the left side, the two telescopic units on the right side are controlled to extend, and the two telescopic units on the left side are controlled to shorten, according to the telescopic amount.

[0038] Optionally, the extension length of each telescopic unit can be adjusted in real time according to the concentration of cooking fumes on the front, left, and right sides of the range hood, to change the distance and / or tilt of the baffle plate relative to the smoke inlet, including:

[0039] When the oil fume concentration on the front, left, and right sides of the range hood is reduced to below the second preset concentration threshold and remains below the preset time, the telescopic units are controlled to retract until the baffle plate closes at the smoke inlet.

[0040] Optionally, before acquiring the oil fume concentrations at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors, the method further includes:

[0041] Obtain the boot command;

[0042] Upon receiving the power-on command, the telescopic units are controlled to extend by the same third preset distance.

[0043] In a second aspect, the present invention also provides a concealed range hood for performing a control method for a range hood as described in any of the first aspects;

[0044] The range hood includes a main unit, a smoke baffle, and a lifting drive mechanism; the lower surface of the main unit has a smoke inlet; the lifting drive mechanism includes four telescopic units, one end of each telescopic unit is fixed to the inner wall of the main unit, and the other end is rotatably connected to four connection points on the smoke baffle; the connecting lines of the two opposite connection points intersect; the four telescopic units can extend and retract longitudinally.

[0045] The range hood also includes three oil fume concentration sensors, which are located on the lower surface of the main unit and on the front, left, and right sides of the smoke inlet.

[0046] The concealed range hood and its control method provided by this invention collect the real-time oil fume concentration on the front, left and right sides of the range hood using an oil fume concentration sensor, and adjust the extension length of each telescopic unit in the range hood in real time accordingly. This changes the distance and / or tilt of the baffle plate relative to the smoke inlet, alters the wind speed distribution in the air intake area, solves the problem of dynamic capture of oil fumes in multiple directions, effectively improves the oil fume extraction effect in each area, and prevents the spread of oil fumes. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of a concealed range hood provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of another concealed range hood provided in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of a lifting drive mechanism provided in an embodiment of the present invention;

[0050] Figure 4 This is a structural schematic diagram of another concealed range hood provided in an embodiment of the present invention;

[0051] Figure 5 A flowchart illustrating a control method for a concealed range hood provided in an embodiment of the present invention;

[0052] Figure 6 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0053] Figure 7 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0054] Figure 8 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0055] Figure 9 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0056] Figure 10 This is a schematic diagram of a smoke baffle in a forward and backward tilted posture according to an embodiment of the present invention;

[0057] Figure 11 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0058] Figure 12 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0059] Figure 13 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0060] Figure 14 A side view of a smoke baffle in a left-right tilted posture provided in an embodiment of the present invention;

[0061] Figure 15 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0062] Figure 16 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0063] Figure 17 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention;

[0064] Figure 18 This is a flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention.

[0065] in:

[0066] 10-Main unit housing; 101-Smoke inlet; 102-Front inner wall; 103-Rear inner wall; 20-Smoke baffle; 21-Connection point; 211-Front connection point; 212-Rear connection point; 30-Lifting drive mechanism; 301-Telescopic unit; 3011-Linear motor; 3012-First support arm; 3013-Second ball joint; 3014-Second support arm; 3015-First ball joint; 40-Fume concentration sensor; 50-Angle sensor; 60-Fan. Detailed Implementation

[0067] 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.

[0068] 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.

[0069] 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".

[0070] 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.

[0071] 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".

[0072] Figure 1This is a structural schematic diagram of a concealed range hood provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of another concealed range hood provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of a lifting drive mechanism provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of another concealed range hood provided in an embodiment of the present invention, as shown below. Figures 1-4 As shown, the concealed range hood includes a main unit housing 10, a smoke baffle 20, and a lifting drive mechanism 30. A smoke inlet 101 is provided on the lower surface of the main unit housing 10. The lifting drive mechanism 30 includes four telescopic units 301, one end of which is fixed to the inner wall of the main unit housing 10, and the other end is rotatably connected to four connection points 21 on the smoke baffle 20, corresponding one-to-one; the connecting lines of any two opposite connection points 21 intersect; the four telescopic units 301 can extend and retract longitudinally. The range hood also includes three oil fume concentration sensors 40, which are located on the lower surface of the main unit housing 10, in front of, to the left of, and to the right of the smoke inlet 101.

[0073] Specifically, refer to Figures 1-4 The concealed range hood includes a main unit housing 10, a smoke baffle 20, and a lifting drive mechanism 30. The lifting drive mechanism 30 includes four telescopic units 301. One end of each telescopic unit 301 is fixed to the inner wall of the main unit housing 10, and the other end is rotatably connected to four connection points 21 on the smoke baffle 20. The four telescopic units 301 can extend and retract longitudinally, thereby controlling the smoke baffle 20 to adjust in multiple directions, achieving non-fixed-direction angle adjustment. Furthermore, the connecting lines of any pair of opposite connection points 21 on the smoke baffle 20 intersect, meaning the four connection points 21 are symmetrically distributed around a center point of the smoke baffle 20. This ensures good stability of the smoke baffle 20 when the four telescopic units 301 extend and retract longitudinally, preventing the smoke baffle 20 from wobbling during movement.

[0074] Further, refer to Figure 1 When the range hood is turned off, the baffle 20 is in a closed state, and the four telescopic units 301 are retracted to their shortest length. The baffle 20 is closed at the smoke inlet 101. At this time, the baffle 20 can be hidden in the specially designed storage space inside the cabinet or smoke hood, flush with the bottom of the cabinet, achieving complete concealment and improving the overall aesthetics of the kitchen.

[0075] After turning on the range hood, refer to Figure 2At this time, the smoke baffle 20 is in the open state, and the four telescopic units 301 extend with the same or different extension amounts, so that the smoke baffle 20 descends to a position where there is a gap with the smoke inlet 101, and is tilted at different angles, so that the oil fumes generated during cooking can be sucked in through the smoke inlet 101 opened on the lower surface of the main unit 10. Furthermore, since the other ends of the four telescopic units 301 are rotatably connected to the four connection points 21 on the smoke baffle 20 respectively, when different oil fume concentrations are generated at different positions of the smoke baffle 20 during cooking, the extension amount of the four telescopic units 301 can be adjusted to tilt the smoke baffle 20 towards the side with a higher oil fume concentration, so that the oil fumes can be sucked in by the range hood as quickly as possible.

[0076] Further, refer to Figure 4 The range hood also includes three oil fume concentration sensors 40. These sensors are located on the lower surface of the main unit 10, at the front, left, and right sides of the smoke inlet 101, defined from the user's perspective. The oil fume concentration sensors 40 on the left and right sides of the range hood are used to detect the oil fume concentration in the left and right areas of the range hood in real time, while the oil fume concentration sensor 40 at the front of the range hood is used to detect the oil fume concentration in the front area. Based on the oil fume concentration detected by the three sensors 40, the extension and retraction amount of each of the four telescopic units 301 can be determined, causing the baffle plate 20 to tilt towards the side with higher oil fume concentration.

[0077] This invention connects the two ends of four telescopic units to the inner wall of the main unit housing and four connection points of the smoke baffle, respectively, with each connection point corresponding to one of the four connection points for rotational connection. This allows the four telescopic units to extend and retract to different lengths according to the concentration of cooking fumes when the range hood is on, resulting in different tilt postures of the smoke baffle. This alters the airflow distribution in the air intake area, solving the problem of dynamic capture of cooking fumes from multiple directions and effectively improving the fume extraction effect in each area. Furthermore, when the range hood is off, the four telescopic units retract to their shortest length, placing the smoke baffle at the smoke inlet on the lower surface of the main unit housing, achieving complete concealment and enhancing the overall aesthetics of the kitchen.

[0078] Figure 5 This is a flowchart illustrating a control method for a concealed range hood provided in an embodiment of the present invention, used to control the aforementioned concealed range hood, such as... Figure 5 As shown, the control method includes:

[0079] S101. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0080] Specifically, refer to Figures 1-4After the range hood is turned on, three oil fume concentration sensors 40 located on the front, left, and right sides of the range hood begin to collect the concentration of oil fumes generated during cooking in real time. The front, left, and right sides are defined from the user's perspective. The oil fume concentration sensors 40 located on the left and right sides of the range hood are used to detect the oil fume concentration in the left and right areas of the range hood in real time, while the oil fume concentration sensor 40 located on the front side of the range hood is used to detect the oil fume concentration in the area in front of the range hood. For example, the two oil fume concentration sensors 40 located on the left and right sides can be directly facing the center of the left and right cooktops, and the oil fume concentration sensor located on the front side can be located at the center of the front side of the lower surface of the main unit.

[0081] S102. Adjust the extension length of each telescopic unit in real time according to the oil fume concentration on the front, left and right sides of the range hood, so as to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet.

[0082] Specifically, based on the oil fume concentration collected by the three oil fume concentration sensors 40 at the front, left, and right sides of the range hood, it can be determined which area of ​​the range hood has a higher oil fume concentration during cooking. Based on this, the extension length of each telescopic unit 301 can be adjusted in real time. The extension lengths of each telescopic unit 301 can be the same or different, thereby changing the distance and / or tilt of the baffle plate 20 relative to the smoke inlet 101. In other words, when the oil fume concentrations collected by the three oil fume concentration sensors 40 are similar, the extension lengths of each telescopic unit 301 can be the same, controlling the baffle plate 20 to move a certain distance longitudinally. At this time, the baffle plate 20 is parallel to the lower surface of the main unit 10, creating a gap between the baffle plate 20 and the smoke inlet 101, allowing the oil fumes to smoothly enter the range hood. If the oil fume concentration collected by the three oil fume concentration sensors 40 is higher than that collected by the oil fume concentration sensor 40 located on the left side of the range hood, then the four telescopic units 301 can be controlled to extend to different lengths, thereby causing the smoke baffle 20 to tilt. That is, the left side of the smoke baffle 20 has a larger distance relative to the smoke inlet 101, while the right side of the smoke baffle 20 has a smaller distance relative to the smoke inlet 101. This changes the wind speed distribution in the air intake area and effectively improves the oil fume extraction effect in the left area. It should be noted that making the left side of the smoke baffle 20 have a larger distance relative to the smoke inlet 101, while the right side of the smoke baffle 20 has a smaller distance relative to the smoke inlet 101, is not a limitation of this embodiment. The four telescopic units 301 are rotatably connected to the four connection points 21 on the smoke baffle 20 in a one-to-one correspondence. Therefore, the smoke baffle 20 can be tilted in the four directions of front, back, left, and right according to the oil fume concentration.

[0083] This invention uses a fume concentration sensor to collect real-time fume concentrations at the front, left, and right sides of the range hood, and adjusts the extension length of each telescopic unit in the range hood accordingly. This changes the distance and / or tilt of the baffle plate relative to the smoke inlet, altering the wind speed distribution in the air intake area. This solves the problem of dynamic fume capture in multiple directions, effectively improves the fume extraction effect in each area, and prevents fume diffusion.

[0084] Optionally, refer to Figure 3 The four connection points 21 include two front connection points 211 and two rear connection points 212. The front connection points 211 are located in front of the rear connection points 212. The two front connection points 211 and the two rear connection points 212 are connected in sequence to form a rectangle. One end of the two telescopic units 301 located on the front side is fixed to the front inner wall 102 of the main unit 10, and the other end is rotatably connected to the two front connection points 211. One end of the two telescopic units 301 located on the rear side is fixed to the rear inner wall 103 of the main unit 10, and the other end is rotatably connected to the two rear connection points 212.

[0085] Specifically, refer to Figures 1-4 The main unit 10 includes a front inner wall 102 and a rear inner wall 103. The front inner wall 102 and rear inner wall 103 are defined from the perspective of the range hood facing the user; that is, the side of the main unit 10 closer to the user is the front inner wall 102, and the side farther from the user is the rear inner wall 103. The four connection points 21 on the smoke baffle 20 include two front connection points 211 and two rear connection points 212. The front connection points 211 are located in front of the rear connection points 212, and the two front connection points 211 and the two rear connection points 212 are connected sequentially to form a rectangle. Four telescopic units 301 are connected to the inner wall of the main unit 10 and four connection points 21 respectively. Specifically, one end of the two telescopic units 301 located on the front side is fixed to the inner wall 102 of the front side of the main unit 10, and the other end is rotatably connected to the two front connection points 211 respectively. One end of the two telescopic units 301 located on the rear side is fixed to the inner wall 103 of the rear side of the main unit 10, and the other end is rotatably connected to the two rear connection points 212 respectively.

[0086] Figure 6 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S102, adjusting the extension length of each telescopic unit in real time according to the oil fume concentration on the front, left, and right sides of the range hood to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet can be further refined as follows:

[0087] Based on the concentration of cooking fumes at the front of the range hood, the extension lengths of the two telescopic units located at the front are adjusted in real time to change the forward and backward tilt of the baffle plate relative to the smoke inlet.

[0088] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 6 As shown, the control method provided in this embodiment includes:

[0089] S201. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0090] S202. Adjust the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood, so as to change the front and rear tilt posture of the baffle plate relative to the smoke inlet.

[0091] Specifically, refer to Figures 1-4 When the oil fume concentration sensor 40 located at the front collects a large oil fume concentration, the two telescopic units 301 located at the front can be controlled to extend a longer length so that the baffle plate 20 is tilted back and forth relative to the smoke inlet 101. At this time, the front side of the baffle plate 20 has a larger distance relative to the smoke inlet 101, while the rear side of the baffle plate 20 has a smaller distance relative to the smoke inlet 101. This changes the wind speed distribution in the air intake area, so that the large oil fume concentration at the front of the range hood can be drawn in more quickly, effectively improving the oil fume extraction effect in the front area.

[0092] According to the oil fume concentration at the front of the range hood, the extension length of the two telescopic units located at the front is adjusted in real time, which changes the front and rear tilt posture of the baffle plate relative to the smoke inlet, so that the oil fume at the front of the range hood can be sucked in more quickly, improving the oil fume extraction effect in the front area.

[0093] Optionally, Figure 7 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S202, adjusting the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood to change the front-to-back tilt posture of the baffle plate relative to the smoke inlet can be further refined as follows:

[0094] When the oil fume concentration at the front of the range hood is greater than the first concentration threshold and the rate of change of the oil fume concentration at the front is greater than the first concentration change rate threshold, the two telescopic units located at the front are controlled to extend by a first preset distance to increase the distance between the front edge of the baffle and the smoke inlet.

[0095] When the oil fume concentration at the front of the range hood is less than or equal to the first concentration threshold and / or the rate of change of the oil fume concentration at the front is less than or equal to the first rate of change threshold, the current extension and retraction amount of each extension unit is maintained.

[0096] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 7 As shown, the control method provided in this embodiment includes:

[0097] S301. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0098] S302. When the oil fume concentration at the front of the range hood is greater than the first concentration threshold and the rate of change of the oil fume concentration at the front is greater than the first rate of change threshold, control the two telescopic units located at the front to extend by a first preset distance to increase the distance between the front edge of the baffle plate and the smoke inlet.

[0099] Specifically, based on the oil fume concentration collected by the oil fume concentration sensor 40 located at the front of the range hood, when the oil fume concentration at the front of the range hood is greater than the first concentration threshold and the rate of change of the oil fume concentration at the front is greater than the first concentration rate of change threshold, it indicates that the oil fume concentration at the front of the range hood is large and rising sharply. At this time, the two stoves located below the range hood may be used at the same time, in a double-pot stir-fry mode. Therefore, the two telescopic units 301 located at the front can be controlled to extend by a first preset distance, so that the smoke baffle 20 is tilted downward and forward at a certain angle to increase the distance between the front edge of the smoke baffle 20 and the smoke inlet 101, forming a structure with an opening to the front, so that the oil fumes generated during cooking can be sucked into the range hood as soon as possible.

[0100] Further, refer to Figures 1-4 The range hood also includes a fan 60, which is fixed inside the main unit 10. In order to speed up the speed at which the range hood sucks in oil fumes, the fan 60 can be adjusted to run at the maximum speed to form a powerful suction that instantly removes the thick oil fumes generated by stir-frying.

[0101] S303. When the oil fume concentration at the front of the range hood is less than or equal to the first concentration threshold and / or the rate of change of the oil fume concentration at the front is less than or equal to the first rate of change threshold, maintain the current extension amount of each extension unit.

[0102] Specifically, when the oil fume concentration collected by the oil fume concentration sensor 40 located in front of the range hood is less than or equal to the first concentration threshold, and / or the rate of change of the oil fume concentration in front is less than or equal to the first rate of change threshold, it indicates that the oil fume concentration in front of the range hood is relatively low, or the oil fume concentration in front of the range hood changes relatively steadily and is not in a state of rapid increase. Therefore, the shape of the baffle 20 can meet the current oil fume concentration requirements, and thus the current extension amount of each extension unit 301 can remain unchanged.

[0103] According to the oil fume concentration sensor located at the front of the range hood, which collects the oil fume concentration and the rate of change of oil fume concentration, the extension length of the two telescopic units located at the front is adjusted. When both the oil fume concentration and the rate of change of oil fume concentration are large, the two telescopic units located at the front are controlled to extend by a first preset distance, so that the smoke baffle is tilted downward and forward at a certain angle, increasing the distance between the front edge of the smoke baffle and the smoke inlet. This allows the oil fumes generated during cooking to be sucked into the range hood as quickly as possible, improving the smoke extraction efficiency.

[0104] Optionally, Figure 8 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S102, adjusting the extension length of each telescopic unit in real time according to the oil fume concentration on the front, left, and right sides of the range hood to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet can be further refined as follows:

[0105] Based on the oil fume concentration on the left and right sides of the range hood, the extension length of the two telescopic units on the left or right side is adjusted in real time to change the left and right tilt posture of the baffle plate relative to the smoke inlet.

[0106] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 8 As shown, the control method provided in this embodiment includes:

[0107] S401. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0108] S402. Adjust the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood, so as to change the front and rear tilt posture of the baffle plate relative to the smoke inlet.

[0109] S403. Based on the oil fume concentration on the left and right sides of the range hood, adjust the extension length of the two telescopic units on the left or right side in real time to change the left and right tilt posture of the baffle plate relative to the smoke inlet.

[0110] Specifically, refer to Figures 1-4When the oil fume concentration sensor 40 located on the left or right side of the range hood collects the oil fume concentration, it can adjust the extension length of the two telescopic units 301 on the left or right side in real time according to the oil fume concentration on the left and right sides of the range hood. When the oil fume concentration on the left side of the range hood is higher, the two telescopic units 301 on the left side can be extended a certain distance, while the extension length of the two telescopic units 301 on the right side remains unchanged. When the oil fume concentration on the right side of the range hood is higher, the two telescopic units 301 on the right side can be extended a certain distance, while the extension length of the two telescopic units 301 on the left side remains unchanged. This changes the left and right tilt posture of the baffle 20 relative to the smoke inlet 101, so that the side with higher oil fume concentration has a larger smoke inlet, changing the wind speed distribution in the air intake area, thereby effectively improving the smoke extraction efficiency.

[0111] It is worth mentioning that the control method provided in this embodiment of the invention does not affect the smoke extraction efficiency at the front of the range hood when the range hood adjusts the extension length of the two telescopic units 301 on the left or the two telescopic units 301 on the right in real time according to the smoke concentration on the left and the right. It is understood that after the range hood adjusts each telescopic unit 301 according to the smoke concentration collected by the smoke concentration sensor 40 at the front, adjusting the extension length of the two telescopic units 301 on the left or the two telescopic units 301 on the right will increase the gap between the smoke baffle 20 at the front of the range hood and the smoke inlet 101, thus not reducing the smoke extraction efficiency at the front of the range hood.

[0112] Optionally, Figure 9 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S403, adjusting the extension length of the two telescopic units on the left or the two telescopic units on the right in real time according to the oil fume concentration on the left and right sides of the range hood, so as to change the left and right tilt posture of the baffle plate relative to the smoke inlet, can be further refined as follows:

[0113] Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood;

[0114] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, the current extension and retraction amount of each extension unit is maintained.

[0115] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, and the oil fume concentration on the left is greater than the oil fume concentration on the right, the two telescopic units on the left side are controlled to extend by a second preset distance to increase the average distance between the left edge of the baffle and the smoke inlet.

[0116] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, and the oil fume concentration on the right side is greater than the oil fume concentration on the left side, the two telescopic units on the right side are controlled to extend by a second preset distance to increase the average distance between the right edge of the baffle plate and the smoke inlet.

[0117] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 9 As shown, the control method provided in this embodiment includes:

[0118] S501. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0119] S502. Based on the concentration of oil fumes at the front of the range hood, adjust the extension length of the two telescopic units located at the front in real time to change the forward and backward tilt of the baffle plate relative to the smoke inlet.

[0120] S503. Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood.

[0121] Specifically, the oil fume concentration sensor 40 located on the left side of the range hood and the oil fume concentration sensor 40 located on the right side of the range hood respectively collect the oil fume concentration on the left side of the range hood. And the concentration of cooking fumes on the right side At that time, the oil fume concentration on the left side of the range hood can be calculated. And the concentration of cooking fumes on the right side absolute value of concentration difference , Furthermore, it can be determined based on the absolute value of the concentration difference. Determine the tilt position of the smoke baffle 20.

[0122] S504. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, maintain the current extension amount of each extension unit.

[0123] Specifically, the oil fume concentration on the left side of the range hood And the concentration of cooking fumes on the right side absolute value of concentration difference When the concentration difference is less than or equal to the preset concentration difference threshold, it indicates that the oil fume concentration on both sides of the range hood is relatively equal, with no obvious one-sided overflow. Therefore, the current extension and retraction of each extension unit 301 can be maintained to keep the baffle 20 in a horizontal state, thus maintaining a wide smoke extraction area. The preset concentration difference threshold can be calibrated according to the user's sensitivity to oil fume concentration or the level of ambient noise.

[0124] S505. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, and the oil fume concentration on the left is greater than the oil fume concentration on the right, the two telescopic units on the left side are controlled to extend by a second preset distance to increase the average distance between the left edge of the baffle and the smoke inlet.

[0125] Specifically, if the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, it indicates that the oil fume concentration on one side of the range hood is significantly higher than that on the other side. It is then necessary to determine whether the oil fume concentration is higher on the left or right side in order to determine the tilt direction of the baffle plate 20.

[0126] When the smoke concentration on the left side is greater than that on the right side, it is necessary to increase the smoke extraction efficiency on the left side of the range hood to reduce the smoke concentration there. This is achieved by extending both telescopic units 301 on the left side by a second preset distance, increasing the average distance between the left edge of the baffle 20 and the smoke inlet 101. This creates a larger air intake channel on the left side of the range hood, enhancing its smoke extraction effect. Furthermore, the power of the fan 60 can be adjusted according to the smoke concentration, working in conjunction with the two telescopic units 301 on the left to further improve the smoke extraction efficiency of the range hood.

[0127] S506. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, and the oil fume concentration on the right side is greater than the oil fume concentration on the left side, control the two telescopic units on the right side to extend by a second preset distance to increase the average distance between the right edge of the baffle plate and the smoke inlet.

[0128] Specifically, when the absolute value of the concentration difference between the left and right sides of the range hood exceeds a preset concentration difference threshold, and the concentration of oil fumes on the right side is greater than that on the left, it is necessary to increase the smoke extraction efficiency on the right side of the range hood to reduce the oil fume concentration there. This is achieved by extending both telescopic units 301 on the right side by a second preset distance, increasing the average distance between the right edge of the baffle 20 and the smoke inlet 101. This creates a larger air intake channel on the right side of the range hood, enhancing its smoke extraction effect. Furthermore, the power of the fan 60 can be adjusted according to the smoke concentration, working in conjunction with the two telescopic units 301 on the right side to further improve the smoke extraction efficiency of the range hood.

[0129] In this embodiment of the invention, based on the oil fume concentration collected by oil fume concentration sensors located on the left and right sides of the range hood, when the absolute value of the concentration difference between the two is less than or equal to a preset concentration difference threshold, the current extension and retraction of each telescopic unit is maintained, keeping the smoke baffle in a horizontal state to maintain a wide smoke extraction area. When the absolute value of the concentration difference is greater than the preset concentration difference threshold, the tilt posture of the smoke baffle is determined according to the relationship between the oil fume concentration on the left and right sides, causing both telescopic units on the side with the higher oil fume concentration to extend by a second preset distance, thereby increasing the average distance between the edge of the smoke baffle on this side and the smoke inlet, thus enhancing the smoke extraction effect of the range hood on this side and further improving the smoke extraction efficiency of the range hood.

[0130] Optionally, refer to Figures 1-4 The telescopic unit 301 includes a linear motor 3011 and a first support arm 3012. The linear motor 3011 is fixed to the inner wall of the main unit housing 10. The first support arm 3012 is fixedly connected to the moving part of the linear motor 3011, and the extension direction of the first support arm 3012 is parallel to the extension direction of the guide rail of the linear motor 3011. The telescopic unit 301 also includes a first ball joint 3015, a second ball joint 3013, and a second support arm 3014. The base of the first ball joint 3015 is fixed to the connection point 21, the ball head of the first ball joint 3015 is fixed to one end of the second support arm 3014, the base of the second ball joint 3013 is fixed to the other end of the second support arm 3014, and the ball head of the second ball joint 3013 is fixed to the end of the first support arm 3012 away from the linear motor 3011.

[0131] Specifically, refer to Figure 3 Each telescopic unit 301 includes a linear motor 3011 and a first support arm 3012. The linear motor 3011 is fixed on the inner wall of the main unit housing 10. The first support arm 3012 is fixedly connected to the mover of the linear motor 3011. After the linear motor 3011 is started, its mover will drive the first support arm 3012 connected to it to run together along the extension direction of the guide rail. Each linear motor 3011 can independently control the extension length and extension speed of the corresponding first support arm 3012, thereby enabling the four telescopic units 301 to extend to different lengths relative to the main unit housing 10.

[0132] Further, refer to Figure 3Each telescopic unit 301 includes a linear motor 3011 and a first support arm 3012, as well as a first ball joint 3015, a second ball joint 3013, and a second support arm 3014. The base of the first ball joint 3015 is fixed at the connection point 21, that is, the base of the first ball joint 3015 is connected to the smoke baffle 20. The ball head of the first ball joint 3015 is fixed at one end of the second support arm 3014. The base of the second ball joint 3013 is fixed at the other end of the second support arm 3014. The ball head of the second ball joint 3013 is fixed at the end of the first support arm 3012 away from the linear motor 3011. In this way, the linear motor 3011, the first support arm 3012, the second ball joint 3013, the second support arm 3014 and the first ball joint 3015 are connected sequentially end to end in each telescopic unit 301 to form a motion chain. Then, after the linear motor 3011 is started, the power of the linear motor 3011 is transmitted to the smoke baffle 20 through this motion chain, so that the smoke baffle 20 moves away from the main unit 10.

[0133] Furthermore, based on the connection structure of the second ball joint 3013, the second support arm 3014, and the first ball joint 3015, when the linear motor 3011 in the four telescopic units 301 controls the telescopic length or telescopic speed of the corresponding first support arm 3012 to be different, the second support arm 3014 will tilt to different degrees, so that the first ball joint 3015 can achieve rotation around the second ball joint 3013. That is, the second ball joint 3013, the second support arm 3014, and the first ball joint 3015 together form a kinematic chain, thereby enabling free attitude control of the smoke baffle 20.

[0134] Figure 10 This is a schematic diagram of a smoke baffle in a forward and backward tilted posture according to an embodiment of the present invention, as shown below. Figure 10 As shown, specifically, when the two front telescopic units 301 fixed on the front inner wall 102 of the main unit chassis 10 have a longer telescopic length, while the two rear telescopic units 301 fixed on the rear inner wall 103 of the main unit chassis 10 have a shorter telescopic length, since the smoke baffle 20 has a fixed distance between the front connection point 211 and the rear connection point 212, and the horizontal distance between the two front and rear first support arms 2012 is relatively fixed (e.g., Figure 5 As shown At this time, the second support arms 3014 corresponding to the two telescopic units 301 on the rear side can adaptively tilt, thereby offsetting the fact that the horizontal distance between the front connection point 211 and the rear connection point 212 is less than the horizontal distance between the two front and rear first support arms 2012 under the tilted posture. The problem is that the smoke baffle 20 can successfully complete the angle adjustment. The rotation ultimately increases the effective air intake area of ​​the front air intake area of ​​the range hood and decreases the effective air intake area of ​​the rear air intake area, forming a flow guide barrier. This guides the airflow forward at high speed to form an optimal negative pressure zone, accurately capturing the fumes.

[0135] Similarly, the four telescopic units 301 fixed on the main unit 10 can also be controlled by their respective linear motors 3011 to extend the two telescopic units 301 on the left to a longer length and the two telescopic units 301 on the right to a shorter length. At this time, the effective air intake area of ​​the left air intake area of ​​the range hood will increase, and the effective air intake area of ​​the right air intake area will decrease and form a flow guide barrier, thereby guiding the airflow to converge to the left at high speed to form the optimal negative pressure zone and accurately capture the fumes.

[0136] Understandably, based on this adjustment method, the smoke baffle 20 can be precisely driven to change its tilt and azimuth angles, allowing it to present the desired spatial attitude. That is, the smoke baffle 20 can achieve a compound motion of pitch and yaw rotation with two degrees of freedom, realizing omnidirectional angle adjustment in a non-fixed direction.

[0137] Optionally, Figure 11 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S102, adjusting the extension length of each telescopic unit in real time according to the oil fume concentration on the front, left, and right sides of the range hood to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet can be further refined as follows:

[0138] Based on the oil fume concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, the extension lengths of the two extension units on the left and the two extension units on the right are adjusted in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet.

[0139] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 11 As shown, the control method provided in this embodiment includes:

[0140] S601. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0141] S602. Adjust the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood, so as to change the front and rear tilt posture of the baffle plate relative to the smoke inlet.

[0142] S603. Based on the oil fume concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, adjust the extension length of the two extension units on the left and the two extension units on the right in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet.

[0143] Specifically, refer to Figures 1-4 When the oil fume concentration sensors 40 located on the front, left and right sides of the range hood collect the oil fume concentration of the range hood, they can first adjust the extension length of the two extension units 301 located on the front side according to the oil fume concentration on the front side of the range hood, so as to change the tilt posture of the baffle plate 20 relative to the front side of the smoke inlet 101, and determine the area Sq of the graphic formed by the front edge of the baffle plate 20 and the front edge of the smoke inlet 101.

[0144] For example, refer to Figure 10 After the two telescopic units 301 on the front side of the range hood extend a certain distance, the smoke baffle 20 will tilt downwards at this angle. If the horizontal distance between the front connection point 211 and the rear connection point 212 of the smoke baffle 20 is The length of the smoke baffle is After the two telescopic units 301 on the front side of the range hood extend a certain distance, the area of ​​the air inlet on the front side of the range hood will increase. ,in Furthermore, if d is the vertical distance between the smoke baffle 20 and the smoke inlet 101 when the baffle 20 is horizontal before adjustment, then after the two telescopic units 301 on the front side of the range hood extend a certain distance, the area of ​​the figure formed by the front edge of the smoke baffle 20 and the front edge of the smoke inlet 101 is... .

[0145] Furthermore, after the oil fume concentration sensor 40 located on the left or right side of the range hood collects the oil fume concentration of the range hood, it can adjust the extension length of the two telescopic units 301 on the left and the two telescopic units 301 on the right in real time according to the oil fume concentration on the left and right sides of the range hood. This changes the left and right tilt posture of the baffle 20 relative to the smoke inlet 101, while keeping the area Sq of the graphic formed by the front edge of the baffle 20 and the front edge of the smoke inlet 101 constant. That is, when the oil fume concentration on the left is higher, the two telescopic units 301 on the left side of the range hood can be extended and the two telescopic units 301 on the right side of the range hood can be shortened to keep the area Sq of the graphic on the front of the range hood constant. When the oil fume concentration on the right side is higher, the two telescopic units 301 on the right side of the range hood can be extended and the two telescopic units 301 on the left side of the range hood can be shortened to keep the area Sq of the graphic on the front of the range hood constant.

[0146] This invention maintains a constant area Sq on the front of the range hood, ensuring the stability of the core negative pressure area directly in front of the hood. This avoids potential overall flow field instability and suction dispersion caused by subsequent adjustments to the areas on the left and right sides of the range hood, thus reliably capturing the main column of cooking fumes directly above the cookware. Furthermore, the coordinated adjustment of the telescopic units on both sides allows for adjustments to be made within a stable system baseline, effectively eliminating coupling interference from the dual air inlets and achieving precise and balanced capture of uneven or dynamically changing fumes on both sides.

[0147] Optionally, Figure 12 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S603, based on the oil fume concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, the extension lengths of the two extension units on the left and the two extension units on the right are adjusted in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet. Specifically, this can be refined as follows:

[0148] Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood;

[0149] When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, the current extension and retraction amount of each extension unit is maintained.

[0150] When the absolute value of the difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, the two extension units on the side with the higher oil fume concentration are extended by the same amount of extension, while the two extension units on the side with the lower oil fume concentration are shortened.

[0151] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 12 As shown, the control method provided in this embodiment includes:

[0152] S701. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0153] S702. Adjust the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood, so as to change the front and rear tilt posture of the baffle plate relative to the smoke inlet.

[0154] S703. Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood.

[0155] Specifically, the oil fume concentration sensor 40 located on the left side of the range hood and the oil fume concentration sensor 40 located on the right side of the range hood respectively collect the oil fume concentration on the left side of the range hood. And the concentration of cooking fumes on the right side At that time, the oil fume concentration on the left side of the range hood can be calculated. And the concentration of cooking fumes on the right side absolute value of concentration difference , Furthermore, it can be determined based on the absolute value of the concentration difference. Determine the tilt position of the smoke baffle 20.

[0156] S704. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, maintain the current extension amount of each extension unit.

[0157] Specifically, the oil fume concentration on the left side of the range hood And the concentration of cooking fumes on the right side absolute value of concentration difference When the concentration difference is less than or equal to the preset concentration difference threshold, it indicates that the oil fume concentration on both sides of the range hood is relatively equal, with no obvious one-sided overflow. Therefore, the current extension and retraction of each extension unit 301 can be maintained to keep the baffle 20 in a horizontal state, thus maintaining a wide smoke extraction area. The preset concentration difference threshold can be calibrated according to the user's sensitivity to oil fume concentration or the level of ambient noise.

[0158] S705. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, the two extension units on the side with the higher oil fume concentration are extended by the same amount of extension, and the two extension units on the side with the lower oil fume concentration are shortened.

[0159] Specifically, if the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than the preset concentration difference threshold, it indicates that the oil fume concentration on one side of the range hood is significantly higher than that on the other side. It is then necessary to determine whether the oil fume concentration is higher on the left or right side in order to determine the tilt direction of the baffle plate 20.

[0160] When the oil fume concentration on the left side is greater than that on the right side, it is necessary to increase the smoke extraction efficiency on the left side of the range hood to reduce the oil fume concentration on the left side. In order to ensure that the area Sq of the graphic formed by the front edge of the smoke baffle 20 and the front edge of the smoke inlet 101 remains unchanged, it is necessary to control the two telescopic units 301 on the left side to extend and the two telescopic units 301 on the right side to shorten by the same amount of extension.

[0161] When the oil fume concentration on the right side is greater than that on the left side, it is necessary to increase the smoke extraction efficiency on the right side of the range hood to reduce the oil fume concentration on the right side. In order to ensure that the area Sq of the graphic formed by the front edge of the baffle plate 20 and the front edge of the smoke inlet 101 remains unchanged, it is necessary to control the two telescopic units 301 on the right side to extend and the two telescopic units 301 on the left side to shorten with the same amount of extension.

[0162] In this embodiment of the invention, by controlling the telescopic units on the left and right sides to extend or retract by the same amount, the area Sq of the graphic formed by the front edge of the smoke baffle 20 and the front edge of the smoke inlet 101 remains unchanged.

[0163] Optionally, Figure 13 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S705, when the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than a preset concentration difference threshold, the two telescopic units on the side with the higher oil fume concentration are both extended by the same amount of extension, and the two telescopic units on the side with the lower oil fume concentration are both shortened. This can be further refined as follows:

[0164] When the absolute value of the concentration difference between the left and right sides of the range hood exceeds a preset concentration difference threshold, the system will automatically adjust the concentration based on the absolute value of the concentration difference between the left and right sides of the range hood. and formula Calculate the target tilt angle ;

[0165] According to the formula Calculate the expansion / contraction amount ;

[0166] When the oil fume concentration on the left is greater than that on the right, the two telescopic units on the left are controlled to extend and the two telescopic units on the right are controlled to shorten, according to the extension and contraction amount.

[0167] When the oil fume concentration on the right side is greater than that on the left side, the two telescopic units on the right side are controlled to extend, and the two telescopic units on the left side are controlled to shorten, according to the telescopic amount.

[0168] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 13 As shown, the control method provided in this embodiment includes:

[0169] S801. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0170] S802. Adjust the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood, so as to change the front and rear tilt posture of the baffle plate relative to the smoke inlet.

[0171] S803. Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood.

[0172] S804. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to the preset concentration difference threshold, maintain the current extension amount of each extension unit.

[0173] S805. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood exceeds a preset concentration difference threshold, based on the absolute value ΔC of the concentration difference between the oil fume concentration on the left and right sides of the range hood and the formula... Calculate the target tilt angle α.

[0174] Specifically, Figure 14 This is a side view of a smoke baffle in a left-right tilted posture, as provided in an embodiment of the present invention. Figure 14 As shown, when the absolute value ΔC of the oil fume concentration difference between the left and right sides of the range hood is greater than the preset concentration difference threshold, it indicates that the oil fume concentration on one side of the range hood is significantly higher than on the other side. Therefore, it is first necessary to determine the target tilt angle α of the baffle plate 20. ΔC is the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood, and k is the preset conversion coefficient, k=0.5 degrees / unit concentration difference, which determines the sensitivity of the system response. The larger the value of k, the more sensitive it is to changes in the absolute value of the concentration difference ΔC, and the greater the tilting range of the smoke baffle 20.

[0175] S806, According to the formula Calculate the expansion / contraction amount .

[0176] Specifically, refer to Figure 14 Based on the geometric relationship shown in the diagram, it can be deduced that after determining the target tilt angle α of the smoke baffle 20, the extension and retraction amounts of the two telescopic units 301 on the left and the two telescopic units 301 on the right of the range hood can be determined according to the target tilt angle α. ,in Where L1 is the length of the second support arm 3014, This refers to the horizontal distance between the two front connection points 211 or the two rear connection points 212 when the smoke baffle 20 is in a horizontal position. It should be noted that... Figure 14 An example is shown showing the movement of a telescopic unit 301 on one side of a range hood relative to a telescopic unit 301 on the other side. However, in actual control, in order to ensure that the area Sq of the shape formed by the front edge of the smoke baffle 20 and the front edge of the smoke inlet 101 remains unchanged, the telescopic units 301 on both sides of the range hood need to move together, that is, the telescopic unit on one side extends. The telescopic unit on the other side shortens. .

[0177] S807. When the oil fume concentration on the left side is greater than that on the right side, the two telescopic units on the left side are controlled to extend, and the two telescopic units on the right side are controlled to shorten, according to the telescopic amount.

[0178] Specifically, when the concentration of cooking fumes on the left side is greater than that on the right side, it indicates that the concentration of cooking fumes on the left side of the range hood is higher, requiring an increase in the air inlet area on the left side of the range hood. Therefore, based on the extension / retraction amount... The two telescopic units 301 located on the left side are controlled to extend. The two telescopic units 301 located on the right side are both shortened. This ensures that the area Sq of the shape formed by the front edge of the smoke baffle 20 and the front edge of the smoke inlet 101 remains unchanged.

[0179] S808. When the oil fume concentration on the right side is greater than that on the left side, the two telescopic units on the right side are controlled to extend according to the telescopic amount, and the two telescopic units on the left side are controlled to shorten.

[0180] Specifically, when the concentration of cooking fumes on the right side is greater than that on the left side, it indicates that the concentration of cooking fumes on the right side of the range hood is higher, requiring an increase in the air inlet area on the right side of the range hood. Therefore, based on the extension / retraction amount... The two telescopic units 301 located on the right side are controlled to extend. The two telescopic units 301 located on the left side are both shortened. This ensures that the area Sq of the shape formed by the front edge of the smoke baffle 20 and the front edge of the smoke inlet 101 remains unchanged.

[0181] This invention calculates the tilt angle of the baffle plate based on the absolute value of the difference in oil fume concentration between the left and right sides of the range hood. This, in turn, calculates the extension and retraction amounts of the left and right telescopic units of the range hood. The side with higher oil fume concentration extends by the extension amount, while the side with lower oil fume concentration shortens by the extension amount. This ensures that when adjusting the air inlet area on the left and right sides of the range hood, the area formed by the front edge of the baffle plate and the front edge of the air inlet remains constant. Simultaneously, it achieves stepless adjustment of the baffle plate's tilt angle, allowing it to respond smoothly to continuously changing oil fume concentration differences, thus obtaining a more precise and gentle airflow guiding effect than a fixed angle.

[0182] Optionally, Figure 15This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, for step S102, adjusting the extension length of each telescopic unit in real time according to the oil fume concentration on the front, left, and right sides of the range hood to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet can be further refined as follows:

[0183] When the oil fume concentration on the front, left, and right sides of the range hood is reduced to below the second preset concentration threshold and remains below the preset time, the telescopic units are controlled to retract until the baffle plate closes at the smoke inlet.

[0184] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 15 As shown, the control method provided in this embodiment includes:

[0185] S901. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0186] S902. When the oil fume concentration on the front, left and right sides of the range hood is reduced to below the second preset concentration threshold and continues for a preset time, control each telescopic unit to retract until the baffle plate is closed at the smoke inlet.

[0187] Specifically, based on the oil fume concentrations collected by the three oil fume concentration sensors 40 at the front, left, and right sides of the range hood, the current oil fume concentrations at the front, left, and right sides of the range hood can be determined in real time. When the oil fume concentrations at the front, left, and right sides of the range hood all decrease to below the second preset concentration threshold and remain below it for a preset time, it indicates that cooking may have ended and no more high-concentration oil fumes are being produced. At this time, each telescopic unit can be controlled to retract until the baffle plate is sealed at the smoke inlet, achieving complete concealment and ensuring a clean and beautiful kitchen.

[0188] This invention obtains the oil fume concentrations at the front, left, and right sides of the range hood from three oil fume concentration sensors in real time. When the oil fume concentrations all decrease to below a second preset concentration threshold for a preset time, it determines that cooking has ended and controls each telescopic unit to retract until the smoke baffle is closed at the smoke inlet, thus achieving complete concealment of the smoke baffle and ensuring a clean and aesthetically pleasing kitchen.

[0189] Optionally, Figure 16 This is a flowchart illustrating another control method for a concealed range hood provided by an embodiment of the present invention. This embodiment is a refinement based on the above embodiment. Specifically, before step S101, which involves acquiring the oil fume concentrations at the front, left, and right sides of the range hood as collected in real time by three oil fume concentration sensors, the method further includes:

[0190] Obtain the boot command;

[0191] Upon receiving the power-on command, the telescopic units are controlled to extend by the same third preset distance.

[0192] For parts not described in detail in this embodiment, please refer to the foregoing embodiments. For example... Figure 16 As shown, the control method provided in this embodiment includes:

[0193] S1001, Obtain the power-on command.

[0194] Specifically, before the range hood starts working, the start command for the range hood is first obtained.

[0195] S1002. After receiving the power-on command, control each telescopic unit to extend by the same third preset distance.

[0196] Specifically, upon receiving the start command of the range hood, each telescopic unit 301 is controlled to extend by the same third preset distance, i.e., from... Figure 1 The power-off state shown is changed to Figure 2 The power-on state is shown. Then, in this state, each telescopic unit 301 controls the smoke baffle 20 to be in different tilt positions based on the smoke concentration detected by the three smoke concentration sensors 40.

[0197] S1003. Obtain the oil fume concentration at the front, left, and right sides of the range hood, respectively, collected in real time by three oil fume concentration sensors.

[0198] S1004. Adjust the extension length of each telescopic unit in real time according to the oil fume concentration on the front, left and right sides of the range hood, so as to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet.

[0199] This invention improves the reliability of the system by controlling each telescopic unit to extend by the same third preset distance after receiving the power-on command, thus ensuring a large adjustment range when controlling the smoke baffle to be in different tilt positions.

[0200] Optionally, Figure 17 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention is shown below. Figure 17 As shown, this embodiment of the invention provides a detailed flowchart of the specific implementation process. The control method includes the following specific steps:

[0201] S1101, Range hood starts.

[0202] After this step is completed, proceed to step S1102.

[0203] S1102, Control unit starts.

[0204] After this step is completed, proceed to step S1103.

[0205] S1103, The linear motor pushes the smoke baffle to the default position.

[0206] After this step is completed, proceed to step S1104.

[0207] S1104, Enter the main control loop.

[0208] After this step is completed, proceed to step S1105.

[0209] S1105, Real-time monitoring of oil fume concentration sensor data.

[0210] After this step is completed, proceed with steps S1106 and S1122.

[0211] S1106, Read the front side oil fume concentration C3.

[0212] After this step is completed, proceed to step S1107.

[0213] S1107, C3 > threshold Cth3.

[0214] If yes, proceed to step S1108; otherwise, proceed to step S1106.

[0215] S1108, the two linear motors on the front extend downwards by a distance M3.

[0216] After this step is completed, proceed to step S1109.

[0217] S1109, Smoke baffle tilt angle forward and downward .

[0218] After this step is completed, proceed to step S1110.

[0219] S1110, the fan is operating at maximum power.

[0220] After this step is completed, proceed to step S1111.

[0221] S1111, Cooking end judgment.

[0222] If yes, proceed to step S1121; otherwise, proceed to step S1105.

[0223] S1112. Read the oil fume concentrations C1 and C2 on the left and right sides.

[0224] After this step is completed, proceed to step S1113.

[0225] S1113, Record the difference between C1 and C2. , .

[0226] After this step is completed, proceed to step S1114.

[0227] S1114、 >Threshold Cth2.

[0228] If yes, proceed to step S1115; otherwise, proceed to step S1120.

[0229] S1115、C1>C2.

[0230] If yes, proceed to step S1116; otherwise, proceed to step S1118.

[0231] S1116, the two linear motors on the left pull down a distance M2.

[0232] After this step is completed, proceed to step S1117.

[0233] S1117, The smoke baffle is tilted to the left by α1.

[0234] After this step is completed, proceed to step S1111.

[0235] S1118, the two linear motors on the right pull down a distance M1.

[0236] After this step is completed, proceed to step S1119.

[0237] S1119, The smoke baffle is tilted to the right by α2.

[0238] After this step is completed, proceed to step S1111.

[0239] S1120, Maintain the smoke baffle in a horizontal position.

[0240] After this step is completed, proceed to step S1111.

[0241] S1121, The linear motor retracts the smoke baffle upwards.

[0242] After this step is completed, proceed to step S1122.

[0243] S1122, The smoke baffle is completely hidden.

[0244] The control method for the concealed range hood provided in this invention adjusts the extension length of the two telescopic units located on the front side in real time according to the oil fume concentration on the front side of the range hood. This changes the front-to-back tilt posture of the baffle plate relative to the smoke inlet. At the same time, when adjusting the extension length of the two telescopic units on the left or right side according to the oil fume concentration on the left and right sides, this changes the left-to-right tilt posture of the baffle plate relative to the smoke inlet. This results in a larger smoke inlet on the side with higher oil fume concentration, changing the wind speed distribution in the air intake area, thereby effectively improving smoke extraction efficiency.

[0245] Optionally, Figure 18 A flowchart illustrating another control method for a concealed range hood provided in an embodiment of the present invention is shown below. Figure 18 As shown, this embodiment of the invention provides a detailed flowchart of the specific implementation process. The control method includes the following specific steps:

[0246] S1201, Range Hood Start.

[0247] After this step is completed, proceed to step S1202.

[0248] S1202, Control unit starts.

[0249] After this step is completed, proceed to step S1203.

[0250] S1203, The linear motor pushes the smoke baffle to the default position.

[0251] After this step is completed, proceed to step S1204.

[0252] S1204, Enter the main control loop.

[0253] After this step is completed, proceed to step S1205.

[0254] S1205, real-time monitoring of oil fume concentration sensor data.

[0255] After this step is completed, proceed to step S1206.

[0256] S1206, Read the front side oil fume concentration C3.

[0257] After this step is completed, proceed to step S1207.

[0258] S1207, C3 > threshold Cth3.

[0259] If yes, proceed to step S1208; otherwise, proceed to step S1211.

[0260] S1208, the two linear motors on the front extend downwards by a distance M3.

[0261] After this step is completed, proceed to step S1209.

[0262] S1209, the smoke baffle is tilted forward and downward at an angle β.

[0263] After this step is completed, proceed to step S1210.

[0264] S1210, the fan is operating at maximum power.

[0265] After this step is completed, proceed to step S1211.

[0266] S1211. Read the oil fume concentrations C1 and C2 on the left and right sides.

[0267] After this step is completed, proceed to step S1212.

[0268] S1212, Record the difference between C1 and C2. , .

[0269] After this step is completed, proceed to step S1213.

[0270] S1213, >Threshold Cth2.

[0271] If yes, proceed to step S1214; otherwise, proceed to step S1222.

[0272] S1214、C1>C2.

[0273] If yes, proceed to step S1215; otherwise, proceed to step S1218.

[0274] S1215, the two linear motors on the left pull downwards a distance .

[0275] After this step is completed, proceed to step S1216.

[0276] S1216, The two linear motors on the right pull upwards a distance... .

[0277] After this step is completed, proceed to step S1217.

[0278] S1217, The smoke baffle is tilted to the left by α1.

[0279] After this step is completed, proceed to step S1221.

[0280] S1218, the two linear motors on the left pull upwards a distance... .

[0281] After this step is completed, proceed to step S1219.

[0282] S1219, the two linear motors on the right pull downwards a distance. .

[0283] After this step is completed, proceed to step S1220.

[0284] S1220, The smoke baffle is tilted to the right by α2.

[0285] After this step is completed, proceed to step S1221.

[0286] S1221, Cooking end judgment.

[0287] If yes, proceed to step S1223; otherwise, proceed to step S1205.

[0288] S1222, Maintain the smoke baffle in a horizontal position.

[0289] After this step is completed, proceed to step S1221.

[0290] S1223, The linear motor retracts and extends the smoke baffle upwards.

[0291] After this step is completed, proceed to step S1224.

[0292] S1224, The smoke baffle is completely hidden.

[0293] This invention maintains a constant area of ​​the front panel of the range hood, ensuring the stability of the core negative pressure area directly in front of the hood. This avoids potential instability in the overall flow field and dispersion of suction power caused by subsequent adjustments to the left and right sides of the range hood, thus reliably capturing the main column of cooking fumes directly above the cookware. Furthermore, the coordinated adjustment of the telescopic units on both sides allows for adjustments to be made within a stable system baseline, effectively eliminating coupling interference from the dual air inlets and achieving precise and balanced capture of uneven or dynamically changing fumes from both sides.

[0294] 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 control method for a concealed range hood, characterized in that, The range hood includes a main unit housing (10), a smoke baffle (20), and a lifting drive mechanism (30); the lower surface of the main unit housing (10) is provided with a smoke inlet (101); the lifting drive mechanism (30) includes four telescopic units (301), one end of each telescopic unit (301) is fixed to the inner wall of the main unit housing (10), and the other end is rotatably connected to four connection points (21) on the smoke baffle (20); the connecting lines of the four connection points (21) that are opposite to each other intersect; the four telescopic units (301) can extend and retract longitudinally respectively. The range hood also includes three oil fume concentration sensors (40), which are disposed on the lower surface of the main unit (10) and located on the front, left and right sides of the smoke inlet (101); The control method includes: The oil fume concentrations at the front, left, and right sides of the range hood are obtained in real time from the three oil fume concentration sensors. Based on the oil fume concentration on the front, left, and right sides of the range hood, the extension length of each telescopic unit is adjusted in real time to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet.

2. The control method according to claim 1, characterized in that, The four connection points (21) include two front connection points (211) and two rear connection points (212); the front connection point (211) is located in front of the rear connection point (212); the two front connection points (211) and the two rear connection points (212) are connected in sequence to form a rectangle; One end of the two telescopic units (301) located on the front side is fixed to the front inner wall (102) of the main chassis (10), and the other end is rotatably connected to the two front connection points (211); one end of the two telescopic units (301) located on the rear side is fixed to the rear inner wall (103) of the main chassis (10), and the other end is rotatably connected to the two rear connection points (212); Based on the concentration of cooking fumes on the front, left, and right sides of the range hood, the telescopic length of each telescopic unit is adjusted in real time to change the distance and / or tilt of the baffle plate relative to the smoke inlet, including: Based on the concentration of cooking fumes at the front of the range hood, the extension lengths of the two telescopic units located at the front are adjusted in real time to change the forward and backward tilting posture of the baffle plate relative to the smoke inlet.

3. The control method according to claim 2, characterized in that, Based on the concentration of cooking fumes at the front of the range hood, the extension and retraction lengths of the two telescopic units located at the front are adjusted in real time to change the forward and backward tilt posture of the baffle plate relative to the smoke inlet, including: When the oil fume concentration at the front of the range hood is greater than a first concentration threshold and the rate of change of the oil fume concentration at the front is greater than a first concentration change rate threshold, the two telescopic units located at the front are controlled to extend by a first preset distance to increase the distance between the front edge of the smoke baffle and the smoke inlet. When the oil fume concentration at the front of the range hood is less than or equal to a first concentration threshold and / or the rate of change of the oil fume concentration at the front is less than or equal to a first rate of change threshold, the current extension amount of each of the telescopic units is maintained.

4. The control method according to claim 2, characterized in that, Based on the oil fume concentration on the front, left, and right sides of the range hood, the telescopic length of each telescopic unit is adjusted in real time to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet, and the system further includes: Based on the oil fume concentration on the left and right sides of the range hood, the extension lengths of the two telescopic units on the left or the two telescopic units on the right are adjusted in real time to change the left and right tilt posture of the baffle plate relative to the smoke inlet.

5. The control method according to claim 4, characterized in that, Based on the oil fume concentration on the left and right sides of the range hood, the extension lengths of the two telescopic units on the left or right side are adjusted in real time to change the left-right tilt posture of the baffle plate relative to the smoke inlet, including: Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood; When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to a preset concentration difference threshold, the current extension amount of each extension unit is maintained. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than a preset concentration difference threshold, and the oil fume concentration on the left side is greater than the oil fume concentration on the right side, the two telescopic units located on the left side are controlled to extend by a second preset distance to increase the average distance between the left edge of the smoke baffle and the smoke inlet. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than a preset concentration difference threshold, and the oil fume concentration on the right side is greater than the oil fume concentration on the left side, the two telescopic units located on the right side are controlled to extend by a second preset distance to increase the average distance between the right edge of the smoke baffle and the smoke inlet.

6. The control method according to claim 2, characterized in that, Based on the oil fume concentration on the front, left, and right sides of the range hood, the telescopic length of each telescopic unit is adjusted in real time to change the distance and / or tilt posture of the baffle plate relative to the smoke inlet, and the system further includes: Based on the oil fume concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, the extension lengths of the two telescopic units on the left and the two telescopic units on the right are adjusted in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet.

7. The control method according to claim 6, characterized in that, Based on the oil fume concentration on the left and right sides of the range hood, while keeping the area of ​​the graphic formed by the front edge of the smoke baffle and the front edge of the smoke inlet unchanged, the extension lengths of the two telescopic units on the left and the two telescopic units on the right are adjusted in real time to change the left and right tilt posture of the smoke baffle relative to the smoke inlet, including: Calculate the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood; When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is less than or equal to a preset concentration difference threshold, the current extension amount of each extension unit is maintained. When the absolute value of the concentration difference between the oil fume concentration on the left and right sides of the range hood is greater than a preset concentration difference threshold, the two telescopic units on the side with the higher oil fume concentration are both extended by the same amount of extension, while the two telescopic units on the side with the lower oil fume concentration are both shortened.

8. The control method according to claim 7, characterized in that, The telescopic unit (301) includes a linear motor (3011) and a first support arm (3012); the linear motor (3011) is fixed on the inner wall of the main unit (10), the first support arm (3012) is fixedly connected to the moving part of the linear motor (3011), and the extension direction of the first support arm (3012) is parallel to the extension direction of the guide rail of the linear motor (3011); The telescopic unit (301) further includes a first ball joint (3015), a second ball joint (3013), and a second support arm (3014); the base of the first ball joint (3015) is fixed on the connection point (21), the ball head of the first ball joint (3015) is fixed to one end of the second support arm (3014), the base of the second ball joint (3013) is fixed to the other end of the second support arm (3014), and the ball head of the second ball joint (3013) is fixed to the end of the first support arm (3012) away from the linear motor (3011); When the absolute value of the concentration difference between the left and right sides of the range hood is greater than a preset concentration difference threshold, the two telescopic units on the side with the higher oil fume concentration are extended by the same amount of extension, and the two telescopic units on the side with the lower oil fume concentration are shortened, including: When the absolute value of the concentration difference between the oil fume concentrations on the left and right sides of the range hood exceeds a preset concentration difference threshold, the system will determine the appropriate action based on the absolute value of the concentration difference between the oil fume concentrations on the left and right sides of the range hood. and formula Calculate the target tilt angle Where k is the preset conversion coefficient; According to the formula Calculate the expansion / contraction amount ;in, The length of the second support arm. The horizontal distance between the two front connection points or the two rear connection points when the smoke baffle is in a horizontal position; When the oil fume concentration on the left side is greater than the oil fume concentration on the right side, the two telescopic units on the left side are controlled to extend and the two telescopic units on the right side are controlled to shorten, according to the telescopic amount. When the oil fume concentration on the right side is greater than that on the left side, the two telescopic units on the right side are controlled to extend and the two telescopic units on the left side are controlled to shorten, according to the telescopic amount.

9. The control method according to claim 1, characterized in that, Based on the concentration of cooking fumes on the front, left, and right sides of the range hood, the telescopic length of each telescopic unit is adjusted in real time to change the distance and / or tilt of the baffle plate relative to the smoke inlet, including: When the oil fume concentration on the front, left, and right sides of the range hood is reduced to below the second preset concentration threshold and remains so for a preset time, each of the telescopic units is controlled to retract until the smoke baffle closes at the smoke inlet.

10. The control method according to claim 1, characterized in that, Before acquiring the oil fume concentrations at the front, left, and right sides of the range hood, respectively, collected in real time by the three oil fume concentration sensors, the method further includes: Obtain the boot command; Upon receiving the power-on command, each of the telescopic units is controlled to extend by the same third preset distance.

11. A concealed range hood, characterized in that, For performing the control method of the range hood as described in any one of claims 1-10; The range hood includes a main unit housing (10), a smoke baffle (20), and a lifting drive mechanism (30); the lower surface of the main unit housing (10) is provided with a smoke inlet (101); the lifting drive mechanism (30) includes four telescopic units (301), one end of each telescopic unit (301) is fixed to the inner wall of the main unit housing (10), and the other end is rotatably connected to four connection points (21) on the smoke baffle (20); the connecting lines of the four connection points (21) that are opposite to each other intersect; the four telescopic units (301) can extend and retract longitudinally respectively. The range hood also includes three oil fume concentration sensors (40), which are located on the lower surface of the main unit (10) and on the front, left and right sides of the smoke inlet (101).

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