Range hood

Abstract

The range hood comprises a draught fan, a shell, a smoke barrier and a rotating shaft, the shell is provided with an air inlet, the smoke barrier is rotationally connected to the air inlet through the rotating shaft, the parts, located on the two sides of the rotating shaft, of the smoke barrier are defined as a first smoke barrier part and a second smoke barrier part respectively, and the surface area of the first smoke barrier part is larger than that of the second smoke barrier part; the gravity center of the smoke barrier is located on the first smoke barrier part, and the smoke barrier has a closing position and a balance position; when the draught fan provides suction wind power towards the interior of the shell, the smoke barrier can rotate around the rotating shaft to the balance position and stop rotating at the balance position so that the air inlet can be kept open, and when the suction wind power disappears, the smoke barrier can fall back to the closed position under the action of the gravity of the smoke barrier, and the air inlet is closed. According to the range hood, a driving mechanism does not need to be arranged to drive the smoke baffle, so that the cost is low, and the opening degree of the air inlet is convenient to adjust.

Description

[0001] Related Applications

[0002] This application claims priority to Chinese patent application number 2024109359795, filed on July 12, 2024, with invention name “Range Hood”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of range hoods, and in particular to a range hood. Background Art

[0004] Common range hoods on the market are equipped with a smoke baffle, which is used to close or open the air inlet of the range hood. Usually, a driving mechanism needs to be set in the range hood. For example, the driving mechanism is configured as a motor and a connecting rod. The motor drives the connecting rod to move to drive the smoke baffle to open or close the air inlet. On the one hand, this driving method through a driving mechanism is relatively costly, and the driving mechanism is prone to failure as the use time increases, which requires maintenance and brings inconvenience to users; on the other hand, the driving mechanism can only realize the opening of a fixed angle to control the opening of the smoke baffle, and cannot realize the real-time adjustment of the smoke inlet according to the size of the oil smoke, which affects the oil smoke extraction effect. Summary of the invention

[0005] Based on this, it is necessary to provide a range hood with lower cost and convenient adjustment of the air inlet opening to improve the oil fume extraction effect.

[0006] A range hood comprises a fan, a shell, a smoke shield and a rotating shaft, the shell having an air inlet, the smoke shield being rotatably installed at the air inlet via the rotating shaft, the smoke shield comprising a first smoke shield portion and a second smoke shield portion respectively located on both sides of the rotating shaft, the surface area of ​​the first smoke shield portion being greater than that of the second smoke shield portion, and the center of gravity of the smoke shield being located at the first smoke shield portion, the smoke shield having a closed position and a balanced position; when the fan provides a suction wind force toward the inside of the shell, the smoke shield can rotate around the rotating shaft to a balanced position and stop rotating at the balanced position to keep the air inlet open, and when the suction wind force disappears, the smoke shield can fall back to the closed position under the action of its own gravity, and the air inlet is closed.

[0007] In one embodiment, when the smoke baffle plate moves from the closed position to the balanced position, the first smoke baffle moves toward the inside of the shell to open the first inlet; at the same time, the second smoke baffle moves away from the shell to open the second inlet.

[0008] In one embodiment, the housing has a mating surface disposed toward the first smoke barrier, and the mating surface is used to be spaced apart from and enclosed by the first smoke barrier to form a first air inlet channel; as the smoke barrier switches between the closed position and the balanced position, the air inlet cross-sectional area of ​​the first air inlet channel remains unchanged. It is understandable that such a configuration can avoid interference with the wind speed caused by changes in the flow cross-sectional area. In addition, the mating surface can also guide the oil smoke entering the smoke hood, which is conducive to the oil smoke being quickly sucked out by the fan.

[0009] In one of the embodiments, the matching surface is configured as an arc surface, and the matching surface is parallel to a movement trajectory of an end surface of a side of the first smoke shielding portion away from the rotating shaft.

[0010] In one embodiment, the first smoke shield is provided with a smoke sensor probe, which is used to detect the oil smoke concentration in the first air inlet channel; and the fan is configured to increase the suction wind force provided by the fan when the smoke sensor probe detects that the oil smoke concentration in the first air inlet channel is greater than a target value. It is understandable that, in this configuration, the suction wind force of the fan can be adjusted according to the oil smoke concentration in the first air inlet channel detected by the smoke sensor probe, so that the oil smoke absorption capacity of the range hood is matched with the oil smoke concentration.

[0011] In one embodiment, a reflective groove is provided on the mating surface corresponding to the smoke sensor probe, and the extending direction of the reflective groove is arranged parallel to the rotation track of the smoke sensor probe. It can be understood that, in this arrangement, the reflective groove can guide the oil smoke, so that the oil smoke flowing along the reflective groove is more stable, and therefore, the smoke sensor probe detects the oil smoke concentration in the reflective groove more accurately.

[0012] In one embodiment, a convex portion is provided on the mating surface, and the reflective groove is provided on the convex portion. A notch connected to the reflective groove is provided at the bottom of the convex portion along the gravity direction, and the notch is used to allow the oil droplets to flow out of the reflective groove under the force of their own gravity. It can be understood that, in this arrangement, the convex portion can prevent the oil droplets formed in the first air inlet channel from entering the reflective groove, and, by providing the notch, the oil droplets formed in the reflective groove can be discharged under their own gravity.

[0013] In one embodiment, a first limit plate and a second limit plate are respectively provided at opposite ends of the air inlet, and when the smoke barrier is in the closed position, along the direction of gravity, the first limit plate stops below the first smoke barrier, and the second limit plate stops above the second smoke barrier. It can be understood that, in such a configuration, the first limit plate is used to limit the first smoke barrier, and the second limit plate is used to limit the second smoke barrier, so that the smoke barrier can be kept in the closed position and will not continue to rotate around the rotation axis under the action of its own gravity.

[0014] In one embodiment, one end of the first limiting plate is connected to one side edge of the air inlet, and the other end extends toward the direction close to the middle of the air inlet; one end of the second limiting plate is connected to the other side edge opposite to the air inlet, and the other end extends toward the direction close to the middle of the air inlet.

[0015] In one embodiment, the range hood further comprises a damping rod, which is located in the housing, and one end of the damping rod is connected to the first smoke shielding portion, and the other end is connected to the inner wall of the housing. It is understandable that the damping rod can absorb the impact during the opening and closing of the smoke shield, thereby reducing the shaking of the smoke shield, and can keep the smoke shield stable at the equilibrium position.

[0016] In one embodiment, the housing includes a fan frame and a smoke collecting hood that are connected to each other, the fan is installed on the fan frame, and the air inlet is opened in the smoke collecting hood.

[0017] Compared with the prior art, the range hood provided by the present application, when the smoke barrier is in the closed position, when the fan provides suction wind force toward the inside of the shell, the pressure inside the smoke barrier is less than the pressure outside, so that the first smoke barrier and the second smoke barrier are both subjected to pressure directed to the inside of the shell. Since the surface area of ​​the first smoke barrier is larger than the surface area of ​​the second smoke barrier, the pressure F1 on the first smoke barrier is greater than the pressure F2 on the second smoke barrier. Under the pressure difference between the first smoke barrier and the second smoke barrier, the smoke barrier rotates around the rotating shaft, thereby opening the air inlet. Specifically, the first smoke barrier rotates around the rotating shaft toward the inside of the shell, and the second smoke barrier rotates around the rotating shaft toward the outside of the shell. Until the smoke barrier rotates to the equilibrium position, at this time, the torque of the pressure F1 on the first smoke barrier, the pressure F2 on the second smoke barrier, and the weight G of the smoke barrier itself are balanced, so that the smoke barrier can stop rotating at the equilibrium position and keep the air inlet open. When the suction wind force disappears, the smoke shield falls back to the closed position under its own gravity and closes the air inlet again. In this way, the smoke shield can be automatically opened or closed by the suction wind force provided by the fan without the need for an additional drive device, which is relatively low in cost and reduces maintenance caused by failure of the drive device. In addition, it can be understood that the greater the suction wind force provided by the fan, the greater the angle at which the smoke shield rotates from the closed position to the equilibrium position, that is, the greater the opening of the air inlet. Therefore, the range hood proposed in this scheme can be combined with the actual oil fume working conditions to adjust the air inlet to the optimal opening size by adjusting the suction wind force provided by the fan, so as to always maintain the optimal oil fume suction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of the range hood provided for this application;

[0020] Figure 2 A front view of the range hood provided for this application;

[0021] Figure 3 The smoke damper provided for this application is in the closed position Figure 2 Sectional view at AA;

[0022] Figure 4 When the smoke shield provided for this application is in the equilibrium position Figure 2 Sectional view at AA;

[0023] Figure 5 A cross-sectional view from another perspective of the range hood provided in this application.

[0024] Figure numerals: 100, range hood; 10, housing; 101, fan frame; 102, smoke hood; 11, air inlet; 111, first limit plate; 112, second limit plate; 113, first inlet; 114, second inlet; 12, mating surface; 121, reflective groove; 122, convex portion; 123, notch; 13, first air inlet channel; 14, air guide plate; 20, smoke shield plate; 21, first smoke shield portion; 22, second smoke shield portion; 30, rotating shaft; 40, smoke sensor probe; 50, damping rod; 60, fan. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 4The present application provides a range hood 100, which includes a fan 60, a shell 10, a smoke shield 20 and a rotating shaft 30. The shell 10 has an air inlet 11, and the smoke shield 20 is rotatably installed at the air inlet 11 through the rotating shaft 30. The smoke shield 20 includes a first smoke shield part 21 and a second smoke shield part 22 respectively located on both sides of the rotating shaft 30. The surface area of ​​the first smoke shield part 21 is greater than the surface area of ​​the second smoke shield part 22, and the center of gravity of the smoke shield 20 is located at the first smoke shield part 21. The smoke shield 20 has a closed position and a balanced position; wherein, when the smoke shield 20 is in the closed position, the air inlet 11 is closed, and when the fan provides a suction wind force toward the shell 10, the smoke shield 20 can rotate around the rotating shaft 30 to the balanced position, and stop rotating at the balanced position to keep the air inlet 11 open, and when the suction wind force disappears, the smoke shield 20 can fall back to the closed position under the action of its own gravity.

[0031] It is understandable that when the smoke shield 20 is in the closed position, the fan provides suction wind force toward the inside of the housing 10, and the pressure inside the smoke shield 20 is lower than the pressure outside, so that the first smoke shield 21 and the second smoke shield 22 are both subjected to pressure directed to the inside of the housing 10. Since the surface area of ​​the first smoke shield 21 is larger than the surface area of ​​the second smoke shield 22, the pressure F1 on the first smoke shield 21 is greater than the pressure F2 on the second smoke shield 22. Under the pressure difference between the first smoke shield 21 and the second smoke shield 22, the smoke shield 20 rotates around the rotating shaft 30, thereby opening the air inlet 11. Specifically, the first smoke barrier 21 moves around the rotating shaft 30 toward the inside of the shell 10, thereby opening the first inlet 113. At the same time, the second smoke barrier 22 moves around the rotating shaft 30 in a direction away from the shell 10, thereby opening the second inlet 114, until the smoke barrier 20 rotates to a balanced position. At this time, the first smoke barrier 21 is subjected to pressure F1, the second smoke barrier 22 is subjected to pressure F2, and the smoke barrier 20's own gravity G is balanced, so that the smoke barrier 20 can stop rotating at the balanced position and keep the air inlet 11 open. When the suction wind force disappears, the smoke barrier 20 falls back to the closed position under its own gravity and closes the air inlet again. In this way, the smoke barrier 20 can automatically open or close the air inlet 11 by using the suction wind force provided by the fan without the need to set up an additional driving device, which is relatively low in cost and reduces maintenance caused by failure of the maintenance device. Furthermore, it can be understood that the greater the suction wind force provided by the fan, the greater the angle at which the smoke baffle 20 rotates from the closed position to the equilibrium position, that is, the greater the opening of the air inlet 11. Therefore, the range hood 100 proposed in this scheme can be combined with the actual oil fume working conditions, and the suction wind force provided by the fan 60 can be adjusted to adjust the air inlet 11 to the optimal opening size, so as to maintain the optimal oil fume suction effect at all times.

[0032] Furthermore, if Figure 3 and Figure 4 As shown, the first limiting plate 111 and the second limiting plate 112 are respectively provided at opposite ends of the air inlet 11. When the smoke barrier 20 is in the closed position, along the gravity direction, the first limiting plate 111 stops below the first smoke barrier 21, and the second limiting plate 112 stops above the second smoke barrier 22. It can be understood that the first limiting plate 111 is used to limit the first smoke barrier 21, and the second limiting plate 112 is used to limit the second smoke barrier 22, so that the smoke barrier 20 can be kept in the closed position without continuing to rotate around the rotating shaft 30 under the action of its own gravity.

[0033] Specifically, one end of the first limiting plate 111 is connected to one side edge of the air inlet 11, and the other end extends toward the direction close to the middle of the air inlet 11. Similarly, one end of the second limiting plate 112 is connected to the other side edge opposite to the air inlet 11, and the other end extends toward the direction close to the middle of the air inlet 11. In this way, the contact area between the first limiting plate 111 and the first smoke barrier 21 can be increased, and the contact area between the second limiting plate 112 and the second smoke barrier 22 can be increased. At the same time, when the smoke barrier 20 is in the closed position, the second limiting plate 112, the smoke barrier 20, and the first limiting plate 111 form an oil path, so that the oil stains on the front side of the shell 10 and the oil stains on the inner side of the smoke barrier 20 can smoothly pass through the first limiting plate 111 into the oil collection device to avoid dripping onto the stove countertop.

[0034] Furthermore, when the smoke shield 20 is in a balanced position, a first inlet 113 is formed between the first smoke shield portion 21 and the first limiting plate 111, a second inlet 114 is formed between the second smoke shield portion 22 and the second limiting plate 112, and a flow area of ​​the first inlet 113 is greater than a flow area of ​​the second inlet 114. In this way, the smoke shield 20 in a balanced position can distribute the air volume to the air inlet 11.

[0035] like Figure 3 and Figure 4 As shown, along the thickness direction of the range hood 100, the second inlet 114 is located in front of the first inlet 113, and the vertical height of the second inlet 114 is greater than the vertical height of the first inlet 113. In this way, the range hood 100 can achieve front airflow through the second inlet 114, and can also achieve rear airflow through the first inlet 113. In addition, since the vertical height of the second inlet 114 is greater than the vertical height of the first inlet 113, the outer wall of the smoke baffle 20 has a guiding function, so as to facilitate the guidance of oil smoke into the first inlet 113.

[0036] The housing 10 is provided with an air guide plate 14 , which is arranged at an angle with the second limiting plate 112 and is used to guide the oil smoke into the second inlet 114 .

[0037] For further information, see Figure 4 and Figure 5 The shell 10 has a mating surface 12 arranged toward the first smoke barrier 21, and the mating surface 12 is used to be spaced apart from and surrounded by the first smoke barrier 21 to form a first air inlet channel 13; as the smoke barrier 20 switches between the closed position and the equilibrium position, the air inlet cross-sectional area of ​​the first air inlet channel 13 remains unchanged.

[0038] It is understandable that, in the case where the matching surface 12 is not provided, when the suction wind force provided by the fan 60 is increased, the first smoke shield 21 further rotates toward the inside of the smoke hood 102, and the opening of the first inlet 113 is further increased. However, the wind speed may decrease because the flow cross-sectional area increases after the oil smoke enters the inside of the smoke hood 102. In other words, although the suction wind force provided by the fan 60 is increased, the wind speed and air flow rate of the first inlet 113 may not increase as expected due to the influence of the flow cross-sectional area. By providing the matching surface 12, the size of the air inlet cross-sectional area of ​​the first air inlet channel 13 remains unchanged. When the suction wind force provided by the fan 60 is increased, the first smoke shield 21 further rotates toward the inside of the smoke hood 102, the opening of the first inlet 113 is further increased, and the size of the air inlet cross-sectional area of ​​the first air inlet channel 13 remains unchanged. Therefore, the wind speed and air flow rate of the air inlet 11 can be increased as expected. That is, by providing the matching surface 12, it is possible to avoid the change of the flow cross-sectional area and the interference with the wind speed. In addition, the matching surface 12 can also guide the oil smoke entering the smoke collecting hood 102, which is conducive to the oil smoke being quickly sucked out by the fan.

[0039] Optionally, the matching surface 12 is configured as an arc surface, and the matching surface 12 is parallel to a movement trajectory of an end surface of one side of the first smoke barrier 21 away from the rotating shaft 30 .

[0040] The first smoke barrier 21 is provided with a smoke sensor probe 40. Figure 4 As shown, the smoke sensor probe 40 is used to detect the oil fume concentration in the first air inlet channel 13; and the fan is configured to increase the suction wind force provided by the fan when the smoke sensor probe 40 detects that the oil fume concentration in the first air inlet channel 13 is greater than the target value. In this way, the suction wind force of the fan 60 can be adjusted according to the oil fume concentration in the first air inlet channel 13 detected by the smoke sensor probe 40, so that the oil fume absorption capacity of the range hood 100 is matched with the oil fume concentration.

[0041] Specifically, the smoke sensor probe 40 is detachably mounted on the end surface of the first smoke barrier 21 away from the rotating shaft 30 , and is disposed toward the first air inlet channel 13 .

[0042] For further information, see Figure 1 , Figure 4 and Figure 5, a reflective groove 121 is provided on the mating surface 12 corresponding to the smoke sensor probe 40, and the extension direction of the reflective groove 121 is arranged parallel to the rotation track of the smoke sensor probe 40. In this way, the smoke sensor probe 40 can detect the oil fume concentration in the reflective groove 121. It can be understood that since the flow rate of oil fume entering the smoke hood 102 is relatively fast, it is easy to form turbulence. By providing the reflective groove 121, the reflective groove 121 can guide the oil fume, so that the oil fume flowing along the reflective groove 121 is more stable. Therefore, the smoke sensor probe 40 detects the oil fume concentration in the reflective groove 121 more accurately.

[0043] Furthermore, if Figure 5 A convex portion 122 is provided on the mating surface 12, and the convex portion 122 is provided protruding from the mating surface 12, and the reflective groove 121 is opened in the convex portion 122. Along the gravity direction, a notch 123 connected to the reflective groove 121 is opened at the bottom of the convex portion 122, and the notch 123 is used to allow the oil droplets to flow out of the reflective groove 121 under the force of their own gravity. The convex portion 122 can prevent the oil droplets formed in the first air inlet channel 13 from entering the reflective groove 121, and by providing the notch 123, the oil droplets formed in the reflective groove 121 can be discharged under their own gravity, thereby preventing the oil droplets from gathering in the reflective groove 121 and interfering with the smoke sensor probe 40 detecting the oil smoke concentration in the reflective groove 121.

[0044] Of course, in other embodiments, the reflective groove 121 may also be opened on the matching surface 12 and recessed relative to the matching surface 12 .

[0045] See also Figures 3 to 5 The range hood 100 further includes a damping rod 50, and the damping rod 50 is located in the housing 10, and one end of the damping rod 50 is connected to the first smoke shielding portion 21, and the other end is connected to the inner wall of the housing 10. The damping rod 50 can absorb the impact during the opening and closing of the smoke shield 20, thereby reducing the shaking of the smoke shield 20, and can keep the smoke shield 20 stable at the equilibrium position.

[0046] It should be noted that the damping rod 50 is a common mechanical device. The damping rod 50 is widely used in engineering and daily life. The working principle of the damping rod is based on the physical effect of damping. It reduces the vibration amplitude by consuming vibration energy, thereby playing a role in shock absorption and stability. The damping rod 50 includes a damping device and a connecting rod, wherein the damping device can adopt different forms such as liquid damping, gas damping or friction damping. The specific structure of the damping rod 50 is not repeated here.

[0047] Among them, Figure 3 As shown, one end of the damping rod 50 is hingedly connected to the first smoke barrier 21 , and the other end is hingedly connected to the inner wall of the housing 10 .

[0048] Optionally, the number of the damping rods 50 may also be configured to be multiple, and the multiple damping rods 50 are distributed at intervals along the width direction of the first smoke barrier 21 .

[0049] like Figure 1 As shown, the housing 10 includes a fan frame 101 and a smoke collecting hood 102 which are connected to each other. The fan 60 is installed on the fan frame 101 , and the air inlet 11 is opened in the smoke collecting hood 102 .

[0050] Optionally, the first limiting plate 111 and the second limiting plate 112 are integrally bent and formed with the smoke collecting hood 102 .

[0051] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A range hood, characterized in that: The range hood comprises a fan (60), a housing (10), a smoke shield (20) and a rotating shaft (30); the housing (10) has an air inlet (11); the smoke shield (20) is rotatably mounted at the air inlet (11) via the rotating shaft (30); the smoke shield (20) comprises a first smoke shield portion (21) and a second smoke shield portion (22) respectively located on both sides of the rotating shaft (30); the surface area of ​​the first smoke shield portion (21) is greater than the surface area of ​​the second smoke shield portion (22); the center of gravity of the smoke shield (20) is located at the first smoke shield portion (21); and the smoke shield (20) has a closed position and a balanced position; When the fan (60) provides suction wind force toward the interior of the shell (10), the smoke baffle (20) can rotate around the rotating shaft (30) to a balanced position and stop rotating at the balanced position to keep the air inlet (11) open; when the suction wind force disappears, the smoke baffle (20) can fall back to the closed position under the action of its own gravity, and the air inlet (11) is closed.

2. The range hood according to claim 1, characterized in that: When the smoke shield (20) moves from the closed position to the balanced position, the first smoke shield portion (21) moves toward the inside of the shell (10), thereby opening the first inlet (113); at the same time, the second smoke shield portion (22) moves in a direction away from the shell (10), thereby opening the second inlet (114).

3. The range hood according to claim 2, characterized in that: The shell (10) has a matching surface (12) disposed toward the first smoke barrier (21), the matching surface (12) being used to be spaced apart from and enclose the first smoke barrier (21) to form a first air inlet channel (13); As the smoke baffle (20) switches between the closed position and the balanced position, the air inlet cross-sectional area of ​​the first air inlet channel (13) remains unchanged.

4. The range hood according to claim 3, characterized in that: The matching surface (12) is configured as an arc surface, and the matching surface (12) is parallel to the movement trajectory of the end surface of one side of the first smoke shielding portion (21) away from the rotating shaft (30).

5. The range hood according to claim 3, characterized in that: The first smoke shielding portion (21) is provided with a smoke sensing probe (40), and the smoke sensing probe (40) is used to detect the concentration of oil smoke in the first air inlet channel (13); Furthermore, the fan (60) is configured to increase the suction wind force provided by the fan (60) when the smoke sensor probe (40) detects that the oil smoke concentration in the first air inlet channel (13) is greater than a target value.

6. The range hood according to claim 5, characterized in that: A reflective groove (121) is provided on the matching surface (12) corresponding to the smoke sensing probe (40), and the extending direction of the reflective groove (121) is arranged parallel to the rotation track of the smoke sensing probe (40).

7. The range hood according to claim 6, characterized in that: The matching surface (12) is provided with a convex portion (122), and the reflective groove (121) is opened on the convex portion (122); Along the direction of gravity, a notch (123) communicating with the reflective groove (121) is provided at the bottom of the convex portion (122), and the notch (123) is used to allow the oil droplets to flow out of the reflective groove (121) under the action of their own gravity.

8. The range hood according to claim 2, characterized in that: A first limit plate (111) and a second limit plate (112) are respectively provided at two opposite ends of the air inlet (11); when the smoke barrier (20) is in a closed position, along the direction of gravity, the first limit plate (111) stops below the first smoke barrier (21), and the second limit plate (112) stops above the second smoke barrier (22).

9. The range hood according to claim 8, characterized in that: One end of the first limiting plate (111) is connected to a side edge of the air inlet (11), and the other end extends toward a direction close to the middle of the air inlet (11); One end of the second limiting plate (112) is connected to the other side edge opposite to the air inlet (11), and the other end extends in a direction close to the middle of the air inlet (11).

10. The range hood according to claim 1, characterized in that: The range hood further comprises a damping rod (50), wherein the damping rod (50) is located inside the shell (10), and one end of the damping rod (50) is connected to the first smoke barrier (21), and the other end is connected to the inner wall of the shell (10).

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