A concealed range hood

Abstract

This utility model discloses a concealed range hood. 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 which 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 four telescopic units can extend and retract longitudinally. The smoke baffle has a closed state and an open state. In the closed state, the four telescopic units are retracted to their shortest length, and the smoke baffle is closed at the smoke inlet. In the open state, the four telescopic units are extended with the same or different extension amounts, so that the smoke baffle descends to a gap with the smoke inlet and is in different tilt positions. This utility model, through non-fixed-direction angle adjustment, achieves real-time changes in the wind speed distribution of the air intake area, solves the problem of dynamic capture of oil fumes from multiple directions, and effectively improves the smoke extraction effect in each area.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a concealed range hood. 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 is usually limited to rotation in a single direction, resulting in a limited range of adjustment and an inability to form an optimal aerodynamic envelope. Furthermore, most smoke baffles are exposed for extended periods, affecting the overall aesthetics of the kitchen and easily accumulating grease, making cleaning inconvenient. While some designs offer height-adjustable and retractable options, their adjustment and concealment functions are typically independent, leading to complex structures and an inability to achieve dynamic, omnidirectional adjustment to adapt to complex oil fume diffusion patterns. Utility Model Content

[0004] This invention provides a concealed range hood that, through non-fixed-direction angle adjustment, achieves real-time changes in the wind speed distribution of the air intake area, solving the problem of dynamic capture of oil fumes from multiple directions and effectively improving the oil fume extraction effect in each area.

[0005] This utility model provides a concealed range hood, including a main unit, a smoke baffle, and a lifting drive mechanism; the lower surface of the main unit has a smoke inlet;

[0006] The lifting drive mechanism includes four telescopic units. One end of each telescopic unit is fixed to the inner wall of the main unit box, and the other end is rotatably connected to four connection points on the smoke baffle plate. The connecting lines of the two opposite connection points intersect. The four telescopic units can extend and retract longitudinally.

[0007] The smoke baffle has a closed state and an open state; in the closed state, the four telescopic units are retracted to their shortest length, and the smoke baffle is closed at the smoke inlet; in the open state, the four telescopic units are extended and have the same or different extension amounts, so that the smoke baffle is lowered to have a gap with the smoke inlet and is in different tilt positions.

[0008] 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;

[0009] 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, and the other end is rotatably connected to the two front connection points respectively.

[0010] One end of the two telescopic units located at the rear is fixed to the inner rear wall of the main unit, and the other end is rotatably connected to the two rear connection points respectively.

[0011] Optionally, the front connection point is located inside the front edge of the upper surface of the smoke baffle, and the rear connection point is located inside the rear edge of the upper surface of the smoke baffle.

[0012] 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.

[0013] Optionally, the telescopic unit further includes a first ball joint, a second ball joint, and a second support arm;

[0014] 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.

[0015] Optionally, a damper is provided at the end of the guide rail of the linear motor.

[0016] Optionally, the edge of the smoke baffle is provided with a magnetic sealing strip.

[0017] Optionally, it also includes a controller and 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;

[0018] The controller includes three oil fume concentration input terminals and four extension output terminals; the three oil fume concentration input terminals are electrically connected to three oil fume concentration sensors respectively; the four extension output terminals are electrically connected to four extension units respectively.

[0019] Optionally, the controller also includes an angle sensor and an angle feedback terminal, with the angle sensor electrically connected to the angle feedback terminal.

[0020] Optionally, it also includes a fan, which is fixed inside the main unit housing, and the lifting drive mechanism is located below the fan.

[0021] This utility model provides a concealed range hood. By connecting the two ends of four telescopic units to the inner wall of the main unit and four connection points of the smoke baffle, and rotating them one-to-one with each connection point, the four telescopic units can extend and retract to different lengths according to the concentration of cooking fumes when the range hood is on. This allows the smoke baffle to be tilted at different angles, thereby changing 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 are controlled to retract to their shortest length, so that the smoke baffle is located at the smoke inlet on the lower surface of the main unit, achieving complete concealment and enhancing the overall aesthetics of the kitchen. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a concealed range hood provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of another concealed range hood provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a lifting drive mechanism provided in an embodiment of this utility model;

[0025] Figure 4 A schematic diagram of the structure of another concealed range hood provided in this embodiment of the present utility model;

[0026] Figure 5 This is a schematic diagram of a smoke baffle in a forward and backward tilted posture, provided as an embodiment of the present utility model.

[0027] in:

[0028] 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

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] The terminology used in the embodiments of this utility model is for the purpose of describing specific embodiments only and is not intended to limit the utility model. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this utility model are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when referring to an element being formed "upper" or "lower" of another element, it can be formed not only directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element. 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 utility model based on the specific circumstances.

[0031] The term "comprising" and its variations as used in this utility model 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".

[0032] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0033] It should be noted that the terms "a" and "a plurality of" used in this utility model 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".

[0034] Figure 1 This 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 structural schematic diagram of a lifting drive mechanism provided in an embodiment of the present utility model. Figure 4 This is a structural schematic diagram of another concealed range hood provided in an embodiment of the present utility model, as shown below. Figures 1-4As 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 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 corresponding connection points 21 on the smoke baffle 20. The connecting lines of any two opposite connection points 21 intersect. The four telescopic units 301 can extend and retract longitudinally. The smoke baffle 20 has a closed state and an open state. In the closed state, the four telescopic units 301 are retracted to their shortest length, and the smoke baffle 20 is closed at the smoke inlet 101. In the open state, the four telescopic units 301 are extended with the same or different extension amounts, so that the smoke baffle 20 descends to a gap with the smoke inlet 101 and is in different tilt positions.

[0035] 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.

[0036] 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 retract 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.

[0037] 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, allowing the fumes generated during cooking to be drawn in through the smoke inlet 101 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, when different concentrations of fumes are generated at different positions on 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 higher fume concentration, allowing the fumes to be drawn in by the range hood more quickly. Thus, by adjusting the angle in a non-fixed direction, the wind speed distribution in the intake area can be changed in real time according to the fume concentration, solving the problem of dynamic capture of fumes from multiple directions and effectively improving the fume extraction effect in each area.

[0038] This embodiment of the 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.

[0039] Optionally, refer to Figures 1-3 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.

[0040] Specifically, refer to Figures 1-3The 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. The two ends of the four telescopic units 301 are respectively connected to the inner wall of the main unit 10 and the four connection points 21. That is, one end of the two telescopic units 301 located on the front side is fixed on 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. One end of the two telescopic units 301 located on the rear side is fixed on 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.

[0041] In an alternative embodiment, reference Figure 3 The front connection point 211 is located inside the front edge of the upper surface of the smoke baffle 20, and the rear connection point 212 is located inside the rear edge of the upper surface of the smoke baffle 20. This improves the stability of the smoke baffle 20 during movement and ensures that the telescopic unit 301 can be completely hidden in the main unit housing 10 by the smoke baffle 20 in the retracted state, thus ensuring that the exposed lower surface of the smoke baffle 20 is simple and beautiful.

[0042] Optionally, 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 housing 10, and the first support arm 3012 is fixedly connected to the moving part of the linear motor 3011. The extension direction of the first support arm 3012 is parallel to the extension direction of the guide rail of the linear motor 3011.

[0043] 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 to the inner wall of the main housing 10, and 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 along the extension direction of the guide rail. Each linear motor 3011 can independently control the extension length and extension speed of its corresponding first support arm 3012, thereby enabling the four telescopic units 301 to extend to different lengths relative to the main housing 10. For example, the linear motor 3011 can also be a pneumatic push rod, driven by air pressure.

[0044] In an optional embodiment, a damper (not shown in the figure) is provided at the end of the guide rail of the linear motor 3011. The damper can play a buffering role during the extension and retraction of the first support arm 3012 to reduce impact noise.

[0045] Optionally, 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 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.

[0046] Specifically, refer to Figure 3 Each 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.

[0047] 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.

[0048] Figure 5 This is a schematic diagram of a smoke baffle in a forward and backward tilted posture, as provided in an embodiment of the present invention. Figure 5As 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 in D1), at this time, the second support arm 3014 corresponding to the two telescopic units 301 on the rear side can adaptively tilt, thereby offsetting the problem that the horizontal distance between the front connection point 211 and the rear connection point 212 is less than the horizontal distance D1 between the two first support arms 2012 on the front and rear sides under the tilted posture. This allows the smoke baffle 20 to smoothly complete the rotation of angle β, ultimately increasing the effective air intake area of ​​the front air intake area of ​​the range hood and decreasing the effective air intake area of ​​the rear air intake area to form a flow guide barrier, thereby guiding the airflow forward at high speed to form the optimal negative pressure zone and accurately capture the oil fumes.

[0049] 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.

[0050] 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 posture. That is, the smoke baffle 20 can achieve a composite motion of pitch and yaw rotation, realizing omnidirectional angle adjustment in a non-fixed direction. For example, based on the connection structure combining the second ball joint, the second support arm, and the first ball joint, a three-section hinged baffle can also be used, which folds and stores when the smoke baffle 20 is retracted.

[0051] This utility model embodiment uses a connection structure combining a second ball joint, a second support arm, and a first ball joint to achieve angle adjustment of the baffle in multiple directions (front, back, left, and right), which can change the wind speed distribution in the air intake area in real time and solve the problem of dynamic capture of oil fumes in multiple directions.

[0052] Optionally, the edge of the smoke baffle 20 is provided with a magnetic sealing strip. When the range hood is turned off and the linear motor 3011 controls the first support arm 3012 to retract, the smoke baffle 20 will be fully pulled back. At this time, when the smoke baffle 20 with the magnetic sealing strip is retracted, the magnetic sealing strip will automatically adhere to the edge of the main unit box 10, thereby avoiding the risk of oil seepage when the range hood is turned off.

[0053] Optionally, refer to Figures 1-4 The range hood also includes a controller (not shown in the figure) and three oil fume concentration sensors 40. The three oil fume concentration sensors 40 are located on the lower surface of the main unit 10 and on the front, left, and right sides of the smoke inlet 101. The controller includes three oil fume concentration input terminals and four extension output terminals. The three oil fume concentration input terminals are electrically connected to the three oil fume concentration sensors 40 respectively. The four extension output terminals are electrically connected to the four extension units 301 respectively.

[0054] Specifically, the range hood also includes three oil fume concentration sensors 40. These sensors 40 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 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, and input the detected oil fume concentration values ​​to the controller via the controlled oil fume concentration input terminal. The oil fume concentration sensor 40 located at the front of the range hood is used to detect the oil fume concentration in the front area of ​​the range hood, and input the detected oil fume concentration value to the controller via the controlled oil fume concentration input terminal.

[0055] Furthermore, after receiving the oil fume concentration values ​​detected by the three oil fume concentration sensors 40, the controller calculates the optimal tilt angle of the smoke baffle 20 through the built-in algorithm model, and calculates the extension amount of each of the four telescopic units 301 based on the tilt angle. Then, the controller outputs the extension amount of each of the four telescopic units 301 through the four extension amount output terminals, thereby realizing the control of each of the four telescopic units 301.

[0056] Optionally, refer to Figures 1-3 The range hood also includes an angle sensor 50, and the controller also includes an angle feedback terminal, with the angle sensor 50 electrically connected to the angle feedback terminal.

[0057] Specifically, when the controller controls the four telescopic units 301 to extend to different lengths so that the smoke baffle 20 tilts, an angle sensor 50 can be set on the upper surface of the smoke baffle 20 to detect the angle change of the smoke baffle 20 in real time, and input the angle change value through the angle feedback terminal of the controller to control the value, so that the controller can monitor the current tilt posture of the smoke baffle 20 in real time and avoid damage to the smoke baffle 20 due to excessive tilt angle.

[0058] Optionally, refer to Figures 1-3 The range hood also includes a fan 60, which is fixed inside the main unit box 10, and the lifting drive mechanism 30 is located below the fan 60.

[0059] Specifically, after the range hood is started, the controller also controls the fan 60 to start, creating a negative pressure inside the main unit 10 to draw in the cooking fumes. Furthermore, the controller can adjust the power of the fan 60 based on the fume concentration values ​​detected by the three fume concentration sensors 40. When the fume concentration is high, the power of the fan 60 is increased to accelerate the fume extraction speed; when the fume concentration is low, the power of the fan 60 is decreased, thereby reducing power consumption while meeting the fume concentration requirements.

[0060] This embodiment of the invention uses three oil fume concentration sensors located on the front, left, and right sides of the lower surface of the main unit to detect the concentration of oil fumes generated during cooking in real time. The oil fume concentration values ​​are then sent to the controller, which further controls the four telescopic units to extend to different lengths based on these values. This ensures that the rotation angle of the baffle plate matches the required oil fume concentration, achieving precise oil fume capture. Simultaneously, an angle sensor monitors the tilt angle of the baffle plate in real time to prevent damage due to excessive tilt.

[0061] 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. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A concealed range hood, characterized in that, It 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 (10), and the other end is rotatably connected to four connection points (21) on the smoke baffle (20). The connecting lines of the two opposite connection points (21) intersect. The four telescopic units (301) can extend and retract longitudinally. The smoke baffle (20) includes a closed state and an open state; in the closed state, the four telescopic units (301) are retracted to their shortest length, and the smoke baffle (20) is closed at the smoke inlet (101); in the open state, the four telescopic units (301) are extended and have the same or different extension amounts, so that the smoke baffle (20) is lowered to have a gap with the smoke inlet (101) and is in different tilt postures.

2. The hood 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 each of the two telescopic units (301) located on the front side is fixed to the inner front 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 unit (10), and the other end is rotatably connected to the two rear connection points (212) respectively.

3. The hood according to claim 2, characterized in that, The front connection point (211) is located inside the front edge of the upper surface of the smoke baffle (20), and the rear connection point (212) is located inside the rear edge of the upper surface of the smoke baffle (20).

4. The hood according to claim 1, 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).

5. The range hood according to claim 4, characterized in that, 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 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).

6. The range hood according to claim 4, characterized in that, The linear motor (3011) has a damper at the end of its guide rail.

7. The range hood according to claim 1, characterized in that, The edge of the smoke baffle (20) is provided with a magnetic sealing strip.

8. The range hood according to claim 1, characterized in that, It also includes a controller and 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 controller includes three oil fume concentration input terminals and four extension output terminals; the three oil fume concentration input terminals are electrically connected to the three oil fume concentration sensors (40) respectively; the four extension output terminals are electrically connected to the four extension units (301) respectively.

9. The range hood according to claim 8, characterized in that, It also includes an angle sensor (50), and the controller also includes an angle feedback terminal, the angle sensor (50) being electrically connected to the angle feedback terminal.

10. The range hood according to claim 1, characterized in that, It also includes a fan (60), which is fixed inside the main unit housing (10), and the lifting drive mechanism (30) is located below the fan (60).

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