Air suction opening adjusting structure and range hood with same

Abstract

The utility model discloses an exhaust inlet adjusting structure and a range hood with the same. The exhaust inlet adjusting structure comprises a range hood body, a movable baffle, a movable panel and a driving device. The range hood main body is provided with an air suction panel, and an air suction opening is formed in the air suction panel; the movable baffle divides the air suction opening into a normally-open air suction opening located above the movable baffle all the time and a normally-closed air suction opening shielded by the movable baffle. The movable panel is used for opening or shielding the exhaust inlet, and the part, exposed from the rear side of the movable panel, of the exhaust inlet forms an effective exhaust inlet; compared with the prior art, the driving device of the exhaust inlet adjusting structure opens the normally-open exhaust inlet when the oil smoke amount is large, large negative pressure is formed at the normally-open exhaust inlet so that the oil smoke can be rapidly discharged, and when the oil smoke amount is small, the driving device is used for driving the movable panel to move so that the size of the effective exhaust inlet can be changed. The effective area of the air suction opening is increased, the noise at the air suction opening is reduced while the smoke exhaust requirement is met, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and in particular to an air inlet adjustment structure and a range hood having the same. Background Art

[0002] The range hood comprises a shell, which is surrounded by an air intake port and an exhaust duct. A smoke exhaust fan is arranged in the exhaust duct. When the range hood is working, the smoke exhaust fan starts and forms a negative pressure zone at the air intake port of the range hood. The oil smoke generated by the user's cooking flows into the negative pressure zone, and then enters the exhaust duct from the air intake port of the range hood under the action of the smoke exhaust fan, and is finally discharged. When the power of the range hood is constant, the cross-sectional area of ​​the range hood suction port will have a certain influence on the size of the negative pressure formed by the smoke exhaust fan at it and the wind speed of the oil smoke passing through the range hood suction port. Generally, the smaller the cross-sectional area of ​​the range hood suction port, the greater the negative pressure formed by the smoke exhaust fan at the range hood suction port, the greater the flow rate of the oil smoke passing through the range hood suction port, the greater the wind resistance generated by the range hood suction port to the oil smoke passing through, and the greater the noise when the oil smoke enters through the suction port; the larger the cross-sectional area of ​​the range hood suction port, the smaller the negative pressure formed at the range hood suction port under the smoke exhaust fan, the smaller the wind resistance when the oil smoke passes through the range hood suction port, and the smaller the noise when the oil smoke enters through the suction port. When the user is cooking, if the speed of oil smoke generated during the cooking process is relatively fast and the amount of oil smoke is relatively large, the user should increase the power of the exhaust fan so that the exhaust fan forms a larger negative pressure at the air intake port of the range hood, so that the range hood can promptly and quickly discharge the oil smoke generated by cooking. When the user is cooking, if the speed of oil smoke generated during the cooking process is relatively slow and the amount of oil smoke is relatively small, the user usually adopts the method of reducing the power of the exhaust fan so that the exhaust fan forms a smaller negative pressure at the air intake port of the range hood to deal with the oil smoke. When the power of the exhaust fan is the same, the smaller the cross-sectional area at the air intake port, the greater the noise when the air flow passes through the air intake port, and the larger the cross-sectional area at the air intake port, the smaller the noise when the air flow passes through the air intake port. If the cross-sectional area at the air intake port is adjustable, when the oil smoke concentration is high, a smaller air intake port can be used to quickly discharge the oil smoke. When the oil smoke is small, increasing the cross-sectional area at the air intake port can reduce the noise at the air intake port. Utility Model Content

[0003] The purpose of the utility model is to provide an air inlet adjustment structure and a range hood having the same, which are used to solve the above-mentioned technical problems.

[0004] An air inlet adjustment structure is used for a range hood, the air inlet adjustment structure comprising a range hood body, a movable baffle, a movable panel and a driving device;

[0005] The range hood body has an air suction panel, on which an air suction port is arranged; a movable baffle is slidably connected to the front side of the air suction panel, and divides the air suction port into a normally open air suction port that is always located above the movable baffle and a normally closed air suction port that is blocked by the movable baffle; the movable panel is slidably connected to the front side of the movable baffle and blocks the movable baffle, and is used to open or block the air suction port, and the portion of the air suction port exposed from the rear side of the movable panel forms an effective air suction port, and the air suction area of ​​the effective air suction port is not less than the air suction area of ​​the normally open air suction port; the driving device is used to drive the movable panel to move, or after the normally open air suction port is opened, simultaneously drive the movable baffle and the movable panel to move and adjust the opening size of the normally closed air suction port, so that the size of the effective air suction port changes.

[0006] According to one embodiment of the utility model, a groove is provided on the suction panel, the suction port is provided in the groove, the movable baffle is slidably connected in the groove, an elastic support member is provided at the bottom of the groove, the elastic support member supports the movable baffle from the lower end of the movable baffle, and when the driving device drives the movable baffle to move downward, the elastic support member is compressed.

[0007] According to one embodiment of the utility model, it also includes a fixed baffle, which is arranged in the groove and located above the air suction port. When the movable baffle closes the normally closed air suction port, the movable baffle is docked with the fixed baffle, and the notches on the movable baffle and the fixed baffle are aligned with the air suction port to form a normally open air suction port.

[0008] According to one embodiment of the utility model, the driving device is connected to the movable panel, a linkage member is provided on the inner side of the movable panel, and an avoidance groove is provided on the movable baffle. When the normally open air intake port is opened, the force-applying part of the linkage member acts on the lower edge of the avoidance groove.

[0009] According to one embodiment of the present utility model, the height of the avoidance groove in the up-down direction is not less than the distance that the movable panel moves downward when opening the normally open air suction port.

[0010] According to one embodiment of the utility model, the linkage part includes a connecting section and an oil guiding section, the connecting section is connected to the inner wall of the movable panel, the front edge of the oil guiding section is connected to the lower edge of the connecting section, the oil guiding section passes through the avoidance groove and extends into the rear side of the movable baffle, and a force applying part is provided on the part of the oil guiding section that is aligned with the lower edge of the avoidance groove.

[0011] According to an embodiment of the present invention, at least the lower surface of the force-applying part is horizontally arranged, and there are multiple force-applying parts, which are evenly distributed on the oil guiding section along the left-right direction.

[0012] According to one embodiment of the utility model, a guide groove is provided on the air suction panel, and the driving device includes a driving component, a guide component and a first connecting member. The guide component is provided on the rear wall of the air suction panel, and the driving component is provided on the rear wall of the air suction panel. The output end of the driving component is connected to the first connecting member and is used to drive the first connecting member to slide along the guide component. A second connecting member is provided on the movable panel, and the second connecting member is slidably connected to the guide groove. The second connecting member passes through the guide groove and is connected to the first connecting member.

[0013] According to one embodiment of the utility model, the driving component includes a driving motor and a driving gear. The driving motor is arranged on the rear wall of the suction panel, and its output end is connected to the driving gear. The guide component includes a guide slide, a guide rack and a slider. The guide slide is arranged on the rear wall of the suction panel, the slider is slidably connected to the slide, the guide rack is fixedly connected to the slider, the driving gear is meshed with the guide rack, and the first connecting member is connected to the slider.

[0014] A range hood adopts the above-mentioned air suction port adjustment structure, and the range hood also includes an air collecting box and a smoke exhaust fan arranged in the air collecting box. The air collecting box is arranged in the range hood main body and is located on the rear side of the air suction panel. The air collecting box is provided with an air collecting port corresponding to the air suction port; the air collecting port and the part of the air suction port exposed outside the movable panel are effective air suction ports, and the size of the air collecting port is larger than the size of the normally open air suction port and smaller than the size of the air suction port.

[0015] Compared with the prior art, the air inlet adjustment structure of the utility model has the following advantages:

[0016] The suction port adjustment structure of the utility model has a driving device that can drive the movable panel to move relative to the suction panel, so as to adjust the suction area of ​​the effective suction port. When the amount of oil smoke is relatively large, the normally open suction port is opened to form a large negative pressure at the normally open suction port, which can quickly discharge the oil smoke. When the amount of oil smoke is relatively small, the area of ​​the effective suction port is increased, which can not only meet the demand for discharging oil smoke, but also reduce the noise at the suction port, thereby improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a range hood with an air inlet adjustment structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of another embodiment of a range hood with an air inlet adjustment structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the range hood with the air inlet adjustment structure of the utility model after the movable panel is removed;

[0020] Figure 4 This is a structural exploded view of the range hood with an air inlet adjustment structure of the utility model;

[0021] Figure 5 This is a structural cross-sectional view of a range hood with an air inlet adjustment structure according to the utility model;

[0022] Figure 6 This is a schematic diagram of the installation position and structure of the driving device on the air suction panel in the utility model;

[0023] Figure 7 for Figure 6 A partial enlarged view of the middle A;

[0024] Figure 8 It is a structural schematic diagram of the movable panel in the utility model.

[0025] In the figure: 1. range hood body; 11. air suction panel; 111. air suction port; 112. groove; 113. guide groove; 12. elastic support member; 2. movable baffle; 21. avoidance groove; 3. movable panel; 31. linkage member; 311. connecting section; 312. oil guide section; 313. force application part; 32. second connecting member; 4. driving device; 41. driving assembly; 411. driving motor; 412. driving gear; 42. guiding assembly; 421. guiding slide; 422. guiding rack; 423. sliding block; 43. first connecting member; 5. fixed baffle; 6. air collecting box; 61. air collecting port; 7. smoke exhaust fan.

[0026] The realization of the functions and advantages of the utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0031] The utility model discloses an air inlet adjustment structure for a range hood. Figures 1 to 4 The air suction port adjustment structure includes a range hood body 1, a movable baffle 2, a movable panel 3 and a driving device 4; the range hood body 1 has an air suction panel 11, and the air suction panel 11 is provided with an air suction port 111; the movable baffle 2 is slidably connected to the front side of the air suction panel 11, and the air suction port 111 is divided into a normally open air suction port that is always located above the movable baffle 2 and a normally closed air suction port blocked by the movable baffle 2; the movable panel 3 is slidably connected to the front side of the movable baffle 2 and blocks the movable baffle 2, which is used to open or block the air suction port 111, and the part of the air suction port 111 exposed from the rear side of the movable panel 3 forms an effective air suction port, and the air suction area of ​​the effective air suction port is not less than the air suction area of ​​the normally open air suction port; the driving device 4 is used to drive the movable panel 3 to move, or after the normally open air suction port is opened, simultaneously drive the movable baffle 2 and the movable panel 3 to move and adjust the opening size of the normally closed air suction port, so that the size of the effective air suction port changes.

[0032] In the air inlet adjustment structure of the utility model, when the range hood is started, the driving device 4 starts and drives the movable panel 3 to open the normally open air inlet. At this time, the area of ​​the effective air inlet is the area of ​​the normally open air inlet, and the area of ​​the normally open air inlet is also the minimum air inlet area of ​​the range hood when the range hood is started. When the area of ​​the effective air inlet needs to be increased, the driving device 4 will simultaneously drive the movable baffle 2 and the movable panel 3 to move downward, so that the air inlet blocked by the movable baffle 2 is exposed from the rear side of the movable baffle 2 and the movable panel 3, so as to increase the air inlet area of ​​the effective air inlet.

[0033] The opening process of the air suction port 111 includes a first stage and a second stage. In the first stage, the movable panel 3 moves a first preset stroke, and the movable baffle 2 does not move. At this time, the air inlet area of ​​the effective air suction port is the area of ​​the normally open air suction port. In the second stage, the movable panel 3 and the movable baffle 2 move a second preset stroke. At this time, the movable baffle 2 opens at least part of the normally closed air suction port, and the air inlet area of ​​the effective air suction port is the near wind area of ​​the normally open air suction port + the air inlet area of ​​the part of the normally closed air suction port opened in the second stage, thereby increasing the air inlet area of ​​the effective air suction port.

[0034] When the air inlet adjustment structure is applied to the range hood, the states of the movable panel 3 and the movable baffle 2 can be adjusted according to the speed and amount of oil smoke generated during the user's cooking process.

[0035] When the user is cooking, if the speed of oil smoke generation during cooking is relatively fast and the amount of oil smoke generated is relatively large, at this time, the process of opening the air inlet 111 of the movable panel 3 only needs to proceed to the first stage, that is, the movable panel 3 only needs to open the minimum air inlet area of ​​the normally open air inlet. After the exhaust fan 7 of the range hood is started with a relatively large power, a relatively large negative pressure can be formed at the narrow and long air inlet 111, and the oil smoke generated during the user's cooking process will flow to the narrow and long air inlet 111, and under the action of the negative pressure, it will be sucked into the exhaust air duct of the range hood through the narrow and long air inlet 111. When the oil smoke passes through the narrow and long air inlet 111, the wind speed is relatively large, and it can quickly enter the exhaust air duct and be discharged by the exhaust fan 7, so that the oil smoke generated during the user's cooking process can be quickly sucked into the exhaust air duct by the narrow and long air inlet 111, so that the air in the user's cooking space can be quickly purified.

[0036] If the speed at which oil smoke is generated during cooking is relatively slow and the amount of oil smoke generated is relatively small (for example, when the user is making soup or boiling water), the power of the exhaust fan 7 of the range hood can be reduced. At this time, the process of opening the air intake port 111 by the movable area needs to proceed to the second stage, that is, the movable panel 3 and the movable baffle 2 move together, thereby opening part or all of the normally closed air intake port, and increasing the air inlet area of ​​the effective air intake port accordingly; at this time, the negative pressure at the effective air intake port is relatively small, and the wind resistance is relatively small when the oil smoke enters the interior of the range hood through the effective air intake port, which can reduce noise.

[0037] According to one embodiment of the present invention, please refer to Figure 3 and Figure 4, a groove 112 is provided on the air suction panel 11, an air suction port 111 is provided in the groove 112, a movable baffle 2 is slidably connected in the groove 112, an elastic support member 12 is provided at the bottom of the groove 112, the elastic support member 12 supports the movable baffle 2 from the lower end of the movable baffle 2, and when the driving device 4 drives the movable baffle 2 to move downward, the elastic support member 12 is compressed. The elastic support member 12 can be elastically deformed when the movable baffle 2 approaches the bottom of the groove 112 to play a buffering role, preventing the movable baffle 2 from directly hitting the bottom of the groove 112 and making noise or causing damage. If the driving force driving the movable baffle 2 to move downward is removed, the elastic support member 12 can restore the deformation and drive the movable baffle 2 to reset upward by the elastic force, so that there is no need to apply an additional reset driving force to the movable baffle 2, so as to reduce the energy consumption required for the movable baffle 2 to reset upward.

[0038] According to one embodiment of the present invention, please refer to Figures 1 to 5 The air inlet adjustment structure also includes a fixed baffle 5, which is arranged in the groove 112 and above the air inlet 111. When the movable baffle 2 closes the normally closed air inlet, the movable baffle 2 docks with the fixed baffle 5, and the part where the notches on the movable baffle 2 and the fixed baffle 5 are aligned with the air inlet 111 forms a normally open air inlet. The upper edges of both ends of the movable baffle 2 are provided with lower docking parts, and the lower edges of both ends of the fixed baffle 5 are provided with upper docking parts. When the movable baffle 2 closes the normally closed air inlet, the lower docking part docks with the upper docking part, so that the notch between the two upper docking parts and the notch between the two lower docking parts jointly form a normally open air inlet; in this way, the minimum air suction area of ​​the normally open air inlet can be guaranteed, and the movable baffle 2 can be prevented from affecting the minimum air suction volume of the normally open air inlet.

[0039] According to one embodiment of the present invention, please refer to Figure 5 and Figure 8 The driving device 4 is connected to the movable panel 3. A linkage member 31 is provided on the inner side of the movable panel 3. A avoidance groove 21 is provided on the movable baffle 2. When the normally open air inlet is opened, the force-applying portion 313 of the linkage member 31 acts on the lower edge of the avoidance groove 21. In the second stage of the movable panel 3 opening the air inlet 111, when the driving device 4 drives the movable panel 3 to continue to move downward, the force-applying portion 313 of the linkage member 31 will push the movable baffle 2 to move together, so that the driving device 4 only needs to directly drive the movable panel 3. In the second stage, the movable panel 3 can drive the movable baffle 2 to simplify the driving method of the movable baffle 2.

[0040] According to an embodiment of the present invention, the height of the avoidance groove 21 in the vertical direction is not less than the distance that the movable panel 3 moves downward when opening the normally open air suction port. In this way, it can be ensured that the movable panel 3 can move a sufficient stroke in the first stage to fully open the normally open air suction port to the minimum air suction area, thereby ensuring that when the hood is in a condition where the amount of oil smoke is large and the power of the exhaust fan 7 is high, the normally open air suction port can have enough air intake area to inhale the oil smoke, thereby reducing wind resistance and noise.

[0041] According to one embodiment of the present invention, please refer to Figure 8 The linkage member 31 includes a connecting section 311 and an oil guide section 312. The connecting section 311 is connected to the inner wall of the movable panel 3. The front edge of the oil guide section 312 is connected to the lower edge of the connecting section 311. The oil guide section 312 passes through the avoidance groove 21 and extends into the rear side of the movable baffle 2. A force-applying portion 313 is provided on the portion of the oil guide section 312 aligned with the lower edge of the avoidance groove 21. The oil guide section 312 can increase the connection area between the force-applying portion 313 and the linkage member 31, thereby increasing the structural strength of the force-applying portion 313 and the abutment area with the avoidance groove 21, thereby improving the pushing effect of the force-applying portion 313 on the movable baffle 2, and ensuring that the movable baffle 2 can be stably driven by the movable panel 3.

[0042] The oil guide section 312 is located below the air intake port 111. When the oil smoke enters the air collecting box 6 through the air intake port 111, the oil formed on the inner wall of the movable panel 3 will flow along the inner wall of the movable panel 3 and be received by the oil guide section 312. Then, the oil will flow along the oil guide section 312 and be introduced into the interior of the range hood body 1, thereby avoiding oil droplets from overflowing and improving the user experience.

[0043] According to one embodiment of the present invention, please refer to Figure 8 , at least the lower surface of the force-applying part 313 is horizontally arranged, the number of the force-applying parts 313 is multiple, and the multiple force-applying parts 313 are evenly distributed on the oil guide section 312 along the left-right direction. The lower surface of the force-applying part 313 is arranged horizontally, which can increase the contact area between the force-applying part 313 and the lower edge of the avoidance groove 21, thereby improving the dragging stability of the movable baffle 2 by the force-applying part 313. The number of the force-applying parts 313 is set to be multiple, which can increase the pushing and contacting parts of the linkage member 31 on the movable baffle 2, thereby more evenly distributing the pushing force on the movable baffle 2 to various parts of the upper edge of the avoidance groove 21, preventing the single position of the movable baffle 2 from being concentrated, thereby improving the movement stability and structural stability of the movable baffle 2.

[0044] According to one embodiment of the present invention, please refer to Figure 4 and Figure 7A guide groove 113 is provided on the air suction panel 11, and the driving device 4 includes a driving component 41, a guide component 42 and a first connecting member 43. The guide component 42 is provided on the rear wall of the air suction panel 11, and the driving component 41 is provided on the rear wall of the air suction panel 11, and its output end is connected to the first connecting member 43, which is used to drive the first connecting member 43 to slide along the guide component 42. A second connecting member 32 is provided on the movable panel 3, and the second connecting member 32 is slidably connected in the guide groove 113. The second connecting member 32 passes through the guide groove 113 and is connected to the first connecting member 43.

[0045] The driving component 41 drives the movable panel 3 through the first connecting member 43 and the second connecting member 32. The guide component 42 guides the sliding process of the first connecting member 43, and the guide groove 113 guides the guiding process of the second connecting member 32. In this way, it can be ensured that the movable panel 3 can move within the preset sliding trajectory, prevent the movable panel 3 from being offset, and improve the movement stability of the movable panel 3.

[0046] According to one embodiment of the present invention, please refer to Figure 4 and Figure 7 The driving assembly 41 includes a driving motor 411 and a driving gear 412. The driving motor 411 is arranged on the rear wall of the air suction panel 11, and its output end is connected to the driving gear 412. The guide assembly 42 includes a guide slide 421, a guide rack 422 and a slider 423. The guide slide 421 is arranged on the rear wall of the air suction panel 11, the slider 423 is slidably connected to the slide, the guide rack 422 is fixedly connected to the slider 423, the driving gear 412 is meshed with the guide rack 422, and the first connecting member 43 is connected to the slider 423.

[0047] When the output end of the driving motor 411 rotates, the guide rack 422 can be driven to move linearly through the driving gear 412, thereby driving the slider 423 to slide along the slide seat. In this way, the specific driving method of the driving component 41 on the movable panel 3 can be simplified, and the guiding effect of the guide component 42 can be improved.

[0048] See also Figures 1 to 4The utility model also discloses a range hood, which adopts the above-mentioned air suction port adjustment structure. The range hood also includes an air collecting box 6 and a smoke exhaust fan 7 arranged in the air collecting box 6. The air collecting box 6 is arranged in the range hood body 1 and is located at the rear side of the air suction panel 11. The air collecting box 6 is provided with an air collecting port 61 corresponding to the air suction port 111; the air collecting port 61 and the part of the air suction port 111 exposed outside the movable panel 3 are effective air suction ports, and the size of the air collecting port 61 is larger than the size of the normally open air suction port and smaller than the size of the air suction port 111. When the normally open air intake port is opened, the projection of the normally open air intake port to the surface where the air collecting port 61 is located all falls into the air collecting port 61. When the oil smoke flows through the air collecting port 61 through the normally open air intake port and enters the air collecting box 6, the wind resistance will not increase. Therefore, the size of the air collecting port 61 is larger than that of the normally open air intake port. The part of the air intake port 111 located below the air collecting port 61 is the part for avoiding the linkage 31. The height of this part in the up and down direction needs to be adapted to the maximum stroke of the linkage 31. Therefore, the size of the air intake port 111 is larger than that of the air collecting port 61.

[0049] The suction port adjustment structure of the utility model has a driving device 4 that can drive the movable panel 3 to move relative to the suction panel 11, so as to adjust the suction area of ​​the effective suction port. When the amount of oil smoke is relatively large, the normally open suction port is opened to form a large negative pressure at the normally open suction port, which can quickly discharge the oil smoke. When the amount of oil smoke is relatively small, the area of ​​the effective suction port is increased, which can not only meet the demand for discharging oil smoke, but also reduce the noise at the suction port 111, thereby improving user experience.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air inlet adjustment structure for a range hood, characterized in that: include: A range hood body (1) having an air suction panel (11), wherein the air suction panel (11) is provided with an air suction port (111); A movable baffle (2) is slidably connected to the front side of the air suction panel (11), and divides the air suction port (111) into a normally open air suction port that is always located above the movable baffle (2) and a normally closed air suction port that is blocked by the movable baffle (2); A movable panel (3) is slidably connected to the front side of the movable baffle (2) and covers the movable baffle (2), and is used to open or cover the air suction port (111), wherein the portion of the air suction port (111) exposed from the rear side of the movable panel (3) forms an effective air suction port, and the air suction area of ​​the effective air suction port is not less than the air suction area of ​​the normally open air suction port; A driving device (4) is used to drive the movable panel (3) to move, or to drive the movable baffle (2) and the movable panel (3) to move and adjust the opening size of the normally closed air suction port after the normally open air suction port is opened, so that the size of the effective air suction port changes.

2. The air inlet adjustment structure according to claim 1, characterized in that: The air suction panel (11) is provided with a groove (112), the air suction port (111) is arranged in the groove (112), the movable baffle (2) is slidably connected in the groove (112), and an elastic support member (12) is provided at the bottom of the groove (112), the elastic support member (12) supports the movable baffle (2) from the lower end of the movable baffle (2), and when the driving device (4) drives the movable baffle (2) to move downward, the elastic support member (12) is compressed.

3. The air inlet adjustment structure according to claim 2, characterized in that: It also includes a fixed baffle (5), which is arranged in the groove (112) and located above the air suction port (111). When the movable baffle (2) closes the normally closed air suction port, the movable baffle (2) docks with the fixed baffle (5), and the notches on the movable baffle (2) and the fixed baffle (5) are aligned with the air suction port (111) to form the normally open air suction port.

4. The air inlet adjustment structure according to claim 2, characterized in that: The driving device (4) is connected to the movable panel (3), a linkage member (31) is provided on the inner side of the movable panel (3), and an avoidance groove (21) is provided on the movable baffle (2). When the normally open air inlet is opened, the force-applying portion (313) of the linkage member (31) acts on the lower edge of the avoidance groove (21).

5. The air inlet adjustment structure according to claim 4, characterized in that: The height of the avoidance groove (21) in the up-down direction is not less than the distance the movable panel (3) moves downward when opening the normally open air suction port.

6. The air inlet adjustment structure according to claim 4, characterized in that: The linkage member (31) comprises a connecting section (311) and an oil guiding section (312); the connecting section (311) is connected to the inner wall surface of the movable panel (3); the front edge of the oil guiding section (312) is connected to the lower edge of the connecting section (311); the oil guiding section (312) passes through the avoidance groove (21) and extends into the rear side of the movable baffle (2); the force applying portion (313) is provided on the portion of the oil guiding section (312) aligned with the lower edge of the avoidance groove (21).

7. The air inlet adjustment structure according to claim 6, characterized in that: At least the lower surface of the force-applying portion (313) is arranged horizontally, and there are multiple force-applying portions, which are evenly distributed on the oil guiding section (312) along the left-right direction.

8. The air inlet adjustment structure according to claim 1, characterized in that: The air suction panel (11) is provided with a guide groove (113), and the driving device (4) comprises a driving component (41), a guide component (42) and a first connecting member (43). The guide component (42) is provided on the rear wall of the air suction panel (11). The driving component (41) is provided on the rear wall of the air suction panel (11), and its output end is connected to the first connecting member (43) for driving the first connecting member (43) to slide along the guide component (42). The movable panel (3) is provided with a second connecting member (32), and the second connecting member (32) is slidably connected in the guide groove (113). The second connecting member (32) passes through the guide groove (113) and is connected to the first connecting member (43).

9. The air inlet adjustment structure according to claim 8, characterized in that: The driving assembly (41) comprises a driving motor (411) and a driving gear (412); the driving motor (411) is arranged on the rear wall of the air suction panel (11); and the output end of the driving motor (411) is connected to the driving gear (412); the guiding assembly (42) comprises a guiding slide (421), a guiding rack (422) and a sliding block (423); the guiding slide (421) is arranged on the rear wall of the air suction panel (11); the sliding block (423) is slidably connected to the slide (421); the guiding rack (422) is fixedly connected to the sliding block (423); the driving gear (412) is meshed with the guiding rack (422); and the first connecting member (43) is connected to the sliding block (423).

10. A range hood, using the air inlet adjustment structure according to any one of claims 1 to 8, characterized in that: It also includes an air collecting box (6) and a smoke exhaust fan (7) arranged in the air collecting box (6); the air collecting box (6) is arranged in the smoke exhaust fan body (1) and is located at the rear side of the air suction panel (11); the air collecting box (6) is provided with an air collecting port (61) corresponding to the air suction port (111); the air collecting port (61) and the part of the air suction port (111) exposed outside the movable panel (3) are effective air suction ports, and the size of the air collecting port (61) is larger than the size of the normally open air suction port and smaller than the size of the air suction port (111).

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