A range hood

Abstract

The utility model discloses an oil fume extractor, comprising: upper box, its bottom is open and is used for oil fume to enter, oil dripping part, set up in the upper box, and first filter screen, set up in the upper box and be located the below of oil dripping part, still be provided with second filter screen for guiding the oil that oil dripping part drops to first filter screen in the upper box.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan inside to draw in and exhaust cooking fumes, and a filter to remove some of the grease particles.

[0003] Most range hoods on the market are currently top-mounted, side-mounted, or ultra-thin models. Top-mounted range hoods have a large smoke collection chamber, while side-mounted range hoods have a smoke inlet closer to the smoke source. However, both of these models are large and take up a lot of kitchen space. Ultra-thin range hoods on the market have a small smoke collection chamber when turned on due to space limitations. Furthermore, the ultra-thin design limits the cross-sectional area of ​​the air intake channel, which restricts the maximum airflow and prevents the range hood from achieving a large airflow and strong suction. This limits the ability to make the range hood thinner and with better suction.

[0004] Large air volume and strong suction power are core parameters of current range hoods. In order to make better use of kitchen space, a major trend in the market for range hoods is ultra-thin design. However, the effective air intake channel of ultra-thin range hoods is affected by their external dimensions, which limits the improvement of air volume and the guarantee of suction power, thus creating a bottleneck in improving the smoke extraction effect of range hoods. The applicant has applied for an ultra-thin range hood, referring to the range hood disclosed in Chinese Patent Application No. 202310902426.5, which includes an air inlet assembly and an upper housing. The bottom surface of the upper housing has an air inlet. The air inlet assembly includes a lower housing and a smoke baffle. The lower housing includes a back plate connected to the rear side of the upper housing. The air inlet assembly also includes a first baffle, which is fixedly disposed at the upper end of the smoke baffle. The smoke baffle and the first baffle have at least a closed state and an open state: in the closed state, the smoke baffle is close to the back plate, and the first baffle closes the air inlet; in the open state, the first baffle opens the air inlet, and a smoke-collecting cavity is formed between the smoke baffle and the back plate.

[0005] The aforementioned range hood achieves both a slim profile and effective smoke extraction. However, it places the moving mechanism in the upper housing. To ensure the stability of the moving parts, a drive shaft is typically installed between the left and right moving mechanisms to synchronize their movement. This causes the smoke to flow rapidly from bottom to top when the range hood is turned on. If oil gets stuck on the drive shaft (and similarly if other components are present, such as the guide structure in the range hood disclosed in Chinese Patent Application No. 202221944746.4) within the smoke passage, oil will float. As the oil falls downwards, it cannot effectively collect the oil and will drip into the smoke inlet.

[0006] Therefore, further improvements are needed. Utility Model Content

[0007] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a range hood that can guide oil and prevent it from dripping directly into the smoke outlet.

[0008] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a range hood, comprising:

[0009] The upper chamber has an open bottom for the entry of cooking fumes;

[0010] The oil dripping component is located inside the upper housing; and

[0011] The first filter screen is disposed inside the upper housing and located below the oil dripping component; its characteristic is:

[0012] The upper housing is also equipped with a second filter screen for guiding the oil dripping from the oil-dripping component to the first filter screen.

[0013] When the range hood is turned on, the fumes flow rapidly from bottom to top. If oil gets stuck on the components in the fumes' path, it will cause oil to float. Because there is a certain distance between the first filter and the dripping component, the oil cannot be effectively collected when it falls downwards. By setting a second filter, the oil on the dripping component is guided to the first filter, and then guided downwards by the first filter, ensuring that the oil on the dripping component does not fall directly down to the first filter and drip through it.

[0014] Furthermore, the first filter screen gradually slopes downwards from front to back, and the second filter screen gradually slopes upwards from front to back. The projection of the front end of the second filter screen onto the horizontal plane falls within the projection range of the first filter screen, and the projection of the oil-dripping component onto the horizontal plane falls within the projection range of the second filter screen. The fact that the projection of the second filter screen falls within the range of the first filter screen allows the second filter screen to guide the oil to the first filter screen, and the fact that the projection of the oil-dripping component falls within the range of the second filter screen ensures that the second filter screen receives the oil from the oil-dripping component.

[0015] Furthermore, the vertical height between the lowest point of the second filter screen and the first filter screen is h, and h ≤ 10 mm. By limiting the height difference between the first and second filter screens, a large distance is avoided that would cause oil to still drift at the lower end of the second filter screen.

[0016] Furthermore, the angle between the second filter and the first filter is E, and E ≤ 70°. This ensures that the second filter smoothly guides the oil onto the first filter, and also ensures that the fumes, after passing through the first filter, flow upwards through the second filter with minimal air resistance.

[0017] Furthermore, the second filter screen gradually tilts upward from front to back, the first filter screen has a first mesh, and the front end of the second filter screen is located in front of the first mesh, thereby preventing oil from dripping directly from the first mesh.

[0018] Furthermore, the second filter screen is provided with an oil leakage hole near the front end, the oil leakage hole corresponding to the first solid part located between the first mesh holes on the first filter screen, so as to guide downward on the first filter screen.

[0019] Furthermore, the second filter screen has a second mesh, and the portion of the second filter screen located before the second mesh extends beyond the front end of the first mesh of the first filter screen. The length of the portion of the second filter screen extending beyond the first mesh is D, and D≥3mm, thereby preventing dripping from the front end of the second filter screen down to the first mesh due to the small distance.

[0020] Furthermore, a fan is installed inside the upper housing. The fan includes a volute, and the volute includes front and rear cover plates. The rear cover plate has an air inlet, and the projection of the rear end of the second filter screen onto the horizontal plane is located in front of the projection of the rear cover plate onto the horizontal plane. An air inlet is located at the rear of the fan, forming an air intake channel (main air intake channel) between the rear of the fan and the rear of the upper housing. This restricts the position of the second filter screen, preventing it from entering the air intake channel and reducing resistance when oil fumes pass through.

[0021] Furthermore, the first filter screen gradually tilts downwards from front to back, while the second filter screen gradually tilts upwards from front to back. When the fumes pass upwards through the first filter screen, the second filter screen extends in the opposite direction to the first filter screen. This reduces the tendency of the first filter screen to guide the fumes forward and guides the fumes backwards, allowing them to flow into the main air intake channel. This effectively reduces the air intake resistance and ensures the air intake area.

[0022] According to one aspect of the present invention, the volute of the fan constitutes the oil dripping component, and the bottom of the volute is provided with an oil dripping nozzle as the oil dripping position.

[0023] According to another aspect of this utility model, the range hood further includes a movable component located below the upper housing and a motion mechanism for driving the movable component. The motion mechanism includes a drive mechanism, a transmission mechanism, and a transmission shaft. The transmission mechanism has two components arranged on the left and right sides of the upper housing, and the transmission shaft connects the two transmission mechanisms, constituting the oil dripping component. Because the left and right sides of the movable component need to move synchronously and smoothly, a transmission shaft is provided to synchronize the two sides. The transmission shaft is located in the oil fume channel, at a large distance from the first filter. When the range hood is turned on, the oil on the transmission shaft will splash, and the first filter cannot effectively catch the oil. The second filter guides the oil on the transmission shaft to the first filter, reliably and effectively ensuring the direction of the oil on the transmission shaft and avoiding oil droplet splashing that may cause inconvenience to the user.

[0024] Furthermore, the range hood also includes a fixed housing located below the upper housing and a movable housing that rotates relative to the fixed housing. The movable housing is configured as the aforementioned movable component, ensuring that the range hood achieves an ultra-thin shape when closed, while having a large smoke control and low negative pressure external flow field when open.

[0025] Furthermore, the movable housing includes a U-shaped panel, which comprises a lower panel and side panels located on the left and right sides of the lower panel. The movable housing also includes a reinforcing plate connected between the two side panels. The transmission mechanism includes a drive arm that rotates relative to the upper housing, driven by a drive mechanism, and connecting rods at both ends that are rotatably connected to the drive arm and the reinforcing plate, respectively. By setting the reinforcing plate, the movable housing has an overall U-shaped structure, thereby ensuring the synchronicity of the left and right sides when the movable housing is opened, as well as meeting the requirements for overall rigidity and reliability.

[0026] Furthermore, the reinforcing plate includes a main body, which includes a first main plate extending from top to bottom, a second main plate extending rearward from the lower end of the first main plate, and a third main plate extending downward from the rear end of the second main plate. When the range hood is in the off state, the second main plate is in a state of gradually tilting downward from front to back, so that the oil on the first main plate can flow through the second main plate to the third main plate and be guided downward therefrom.

[0027] Furthermore, to facilitate the connection and oil guiding of the reinforcing plate, the reinforcing plate includes a main body and a connecting plate. There are two connecting plates, which are respectively located on the left and right sides of the main body. The movable box includes a first top plate. The connecting plate includes a connecting top plate connected to the first top plate. The side panel extends along the front-back direction of the range hood. The connecting plate also includes a connecting side plate located on the side of the connecting top plate away from the main body. The connecting side plate is located on the side of the connecting top plate away from the main body and fits against the side panel of the panel.

[0028] Furthermore, the second filter screen includes a filter screen body and a folded edge. The folded edge is bent upward from the rear end of the filter screen body, thereby partially enveloping the drive shaft by the rear end of the filter screen body and the folded edge. The gap between the folded edge and the drive shaft is B, and satisfies: 1mm ≤ B ≤ 5mm. The height of the folded edge is A, and the radius of the drive shaft is r, and satisfies A ≥ 1 / 5r. By controlling the gap between the second filter screen and the drive shaft and the height of the folded edge, the oil floating on the drive shaft is blocked by the folded edge and guided to the filter screen body.

[0029] Furthermore, the range hood also includes a lower housing, with a smoke inlet on the front side of the lower housing. The projection of the smoke inlet on the horizontal plane is located inside the projection of the lower end of the second filter on the horizontal plane, thereby preventing oil droplets from the second filter from entering the smoke inlet.

[0030] Furthermore, the range hood also includes a lower housing disposed below the upper housing for smoke intake. A ventilation section is provided at the connection between the bottom surface of the upper housing and the lower housing. This ventilation section includes a first ventilation opening and a second ventilation opening that are interconnected, with the second ventilation opening located before the first ventilation opening.

[0031] The range hood also includes a hinged plate. When the range hood is in the closed state, the hinged plate closes the second vent. When the range hood is in the open state, the hinged plate opens the second vent. The bottom surface of the first filter screen is provided with a bottom wing plate for guiding the oil from the first filter screen onto the hinged plate.

[0032] By setting a bottom wing plate and a hinged plate, the oil on the first filter screen can be guided downward through the bottom wing plate and the hinged plate, reducing the exposure of oil in the fume duct and preventing oil from drifting or even dripping through the smoke inlet position on the lower box when the first filter screen is too high.

[0033] Furthermore, the first filter screen gradually slopes downwards from front to back. The first filter screen includes a first mesh and a second solid portion located in front of the first mesh. The bottom wing plate includes a first wing plate and a second wing plate. The first wing plate is attached to the bottom surface of the second solid portion, and the second wing plate extends backwards and gradually downwards from the rear end of the first wing plate. When the range hood is in the closed state, the rear end of the second wing plate is located above the opening and closing plate. By setting the first wing plate and the second wing plate, the slope of the first filter screen can be coordinated, and oil can be easily dripped quickly downwards onto the opening and closing plate.

[0034] Furthermore, the range hood also includes a lower housing, which comprises a fixed housing and a movable air inlet component that moves relative to the fixed housing. The movable air inlet component includes a movable housing that rotates relative to the fixed housing about an axis extending in the left-right direction of the range hood, and an air inlet plate that can open forward and close backward relative to the movable housing. A smoke inlet is formed on the air inlet plate. Thus, through the movement of the movable housing and the air inlet plate, the airflow in the lower housing can expand during operation, and the air inlet plate can shift and expand the negative pressure of the incoming air, thereby improving the smoke extraction effect.

[0035] Furthermore, the movable housing includes a front panel, which includes a lower panel and an opening above the lower panel for the air inlet plate to pass through; the lower housing also includes an oil guide plate, which is located between the air inlet plate and the lower panel. Because the air inlet plate shifts and expands the negative pressure of the incoming air, the oil fumes entering the bottom of the range hood flow very quickly. After the oil fumes come into contact with the cold plate, they condense into condensed oil. By setting up the oil guide plate, the oil fumes below the air inlet on the air inlet plate can be guided into the movable housing. This ensures that the oil in the movable air inlet components is collected while maintaining the effective fume extraction, preventing the formation of external runoff marks on the surface of the range hood.

[0036] Furthermore, when the air inlet plate is in the open state, the height difference between the upper end of the oil guide plate and the lower edge of the smoke inlet on the air inlet plate is Q, and Q≤3mm, thereby ensuring that frost condensation will not occur at the lowest edge of the smoke inlet of the air inlet plate.

[0037] Furthermore, the oil guide plate includes a first oil guide plate body and a second oil guide plate body. The upper end of the first oil guide plate body extends into the opening, and the lower end of the first oil guide plate body is located on the rear side of the lower panel. The second oil guide plate body gradually slopes downwards from the lower end of the first oil guide plate body, and the transition position between the two plates is lower than the lower edge of the opening. Thus, different tilt angles can be set for the second plate body relative to the first plate body, making its tilt angle moderate. This facilitates the backward flow of oil while preventing direct dripping or drifting. Moreover, the transition position between the first and second plates body is lower than the lower edge of the opening to prevent oil on the oil guide plate from dripping onto the lower panel.

[0038] Furthermore, the range hood also includes a motion mechanism, which comprises a drive mechanism, a drive arm that rotates relative to the upper housing driven by the drive mechanism, and connecting rods at both ends that are rotatably connected to the drive arm and the movable housing, respectively. The motion mechanism also includes a rotating shaft that rotatably connects the drive arm and the air inlet plate. Thus, the movable housing and the air inlet plate can be driven together by a simple motion mechanism.

[0039] Furthermore, the air inlet plate is provided with a notch for accommodating the rotating shaft, and the lower end of the drive arm is formed with a barb. The rotating shaft is connected to the barb, thereby preventing oil from dripping from the drive arm at its lowest point, which can be caught by the air inlet plate.

[0040] Compared with the prior art, the advantages of this utility model are as follows: When the range hood is turned on, the oil fumes flow rapidly from bottom to top. If oil hangs on the components in the channel through which the oil fumes pass, it will cause oil to float. Since there is a certain distance between the first filter and the oil dripping component, the oil cannot be effectively collected when it falls downwards. By setting a second filter, the oil on the oil dripping component is guided to the first filter, and then guided downwards by the first filter, ensuring that the oil on the oil dripping component will not fall directly downwards to the first filter and drip through it. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the range hood in the open state according to an embodiment of the present utility model;

[0042] Figure 2 This is a cross-sectional view of the range hood in the open state according to an embodiment of the present utility model;

[0043] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0044] Figure 4 for Figure 2 A magnified schematic diagram of part II;

[0045] Figure 5 This is a schematic diagram of the lower casing and motion mechanism of the range hood according to an embodiment of the present utility model;

[0046] Figure 6 This is an exploded structural diagram of the lower casing of the range hood according to an embodiment of the present utility model (with the air inlet plate hidden);

[0047] Figure 7 This is a sectional side view of the movable housing of the lower housing of the range hood according to an embodiment of the present utility model;

[0048] Figure 8 This is a schematic diagram of the movable box-hidden top plate and left and right side plates of the lower box of the range hood according to an embodiment of the present utility model;

[0049] Figure 9 This is a schematic diagram of the reinforcing plate of the movable box of the lower box of the range hood according to an embodiment of the present utility model;

[0050] Figure 10 This is a schematic diagram of the oil guide plate of the movable box of the lower box of the range hood according to an embodiment of the present utility model;

[0051] Figure 11 for Figure 10 A magnified schematic diagram of part III;

[0052] Figure 12 This is a schematic diagram of the two filters and the moving mechanism of the range hood according to an embodiment of the present utility model;

[0053] Figure 13 This is a schematic diagram of the moving mechanism and opening / closing plate of the range hood according to an embodiment of the present utility model;

[0054] Figure 14 This is a schematic diagram of the range hood in the off state according to an embodiment of the present utility model;

[0055] Figure 15 This is a cross-sectional view of the range hood in the closed state according to an embodiment of the present utility model;

[0056] Figure 16 for Figure 15 A magnified schematic diagram of part IV. Detailed Implementation

[0057] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0058] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0059] See Figures 1 to 16 A range hood includes an upper housing 1, a lower housing 2 connected below the upper housing 1, a smoke baffle 3, and a fan 4 disposed inside the upper housing 1.

[0060] The lower housing 2 has a smoke inlet 21 on its front side. The bottom of the upper housing 1 is open, allowing the fumes entering from the smoke inlet 21 of the lower housing 2 to rise into the upper housing 1 and be discharged by the fan 4 inside the upper housing 1. The upper housing 1 can be a combination of an internal fan frame and an external cover, with the fan 4 housed within the fan frame, or it can be a single housing. The smoke baffle 3 can open and close the smoke inlet 21 and, when open, serves to collect the smoke.

[0061] The range hood also includes a first filter 5 disposed at the bottom of the upper housing 1. The first filter 5 extends from the front side of the upper housing 1 to the rear side of the upper housing 1 and gradually slopes downward from front to back. Preferably, the rear end of the first filter 5 is located at the bottom opening of the upper housing 1, while the front end of the first filter 5 is higher than the bottom of the upper housing 1, so that the oil in the first filter 5 can flow downward along the rear side of the lower housing 2. The first filter 5 is located below the fan 4.

[0062] The lower housing 2 may include a fixed housing 22 and a movable housing 23. The movable housing 23 may be nested inside or outside the fixed housing 22 and can rotate relative to the fixed housing 22, with the rotation center preferably near the bottom of the movable housing 23. Thus, when the range hood is off, the overlap between the movable housing 23 and the fixed housing 22 is maximized, resulting in the minimum overall thickness of the lower housing 2 and achieving an ultra-thin form. When the range hood is on, the forward rotation relative to the fixed housing 22 expands the air duct within the lower housing 2, creating a high-smoke-control, low-negative-pressure airflow field that promotes the absorption of cooking fumes.

[0063] See Figures 5-8 In this embodiment, the movable box 23 is fitted over the fixed box 22. The movable box 23 includes a first top plate 231, a first left side plate 232, and a first right side plate 233. The first top plate 231 is located between the tops of the first left side plate 232 and the first right side plate 233. The fixed box 22 includes a second top plate 221, a second left side plate 222, and a second right side plate 223. The second top plate 221 is located between the tops of the second left side plate 222 and the second right side plate 223. Since the movable box 23 is fitted over the fixed box 22, the first top plate 231 is located above and to the left of the second top plate 221, the first left side plate 232 is located to the left of the second left side plate 222, and the first right side plate 233 is located to the right of the second right side plate 223. To avoid obstructing the upper box 1, both the first top plate 231 and the second top plate 221 are provided with corresponding notches. The fixed housing 22 also has a back plate 224, which is connected between the rear ends of the second left side plate 222 and the second right side plate 223, and is located on the side closest to the wall during installation. The fixed housing 22 is fixedly installed to the upper housing 1, and the movable housing 23 and the fixed housing 22 are rotatably connected near the bottom of the fixed housing 22.

[0064] The movable housing 23 may also include a panel 234 located between the first left side panel 232 and the first right side panel 233. The panel 234 is a one-piece panel in the shape of a U-shape, possessing good strength. The panel 234 includes a lower panel 2341 and side panels 2342 located above the left and right sides of the lower panel 2341. The lower panel 2342 is located between the front ends of the first left side panel 232 and the first right side panel 233. A decorative panel 235 may be provided on the front surface of the lower panel 2342. Each side panel 2342 extends along the front-rear direction of the range hood, with the left side panel 2342 located to the right of the first left side panel 232 and the right side panel 2342 located to the left of the first right side panel 233.

[0065] To ensure the synchronicity of the left and right sides when the movable housing 23 is opened, as well as the rigidity and reliability requirements of the whole machine, the movable housing 23 needs to be designed as a closed U-shape. For this purpose, the movable housing 23 also includes a reinforcing plate 236, which is located between the first left side plate 232 and the first right side plate 233, and preferably connected to the side panel 2342, so that the movable housing 23 as a whole has a U-shaped structure.

[0066] The reinforcing plate 236 includes a main body 2361 and a connecting plate 2362. Two connecting plates 2362 are located on the left and right sides of the main body 2361, respectively. The main body 2361 and the connecting plate 2362 can be integrally formed. Viewed from the side of the range hood, the main body 2361 is Z-shaped, including a first main plate 23611 extending downwards, a second main plate 23612 extending rearwards from the lower end of the first main plate 23611, and a third main plate 23613 extending downwards from the rear end of the second main plate 23612. Since the reinforcing plate 236 is located in the fume passage, condensed oil droplets form as the fume passes through. Therefore, when the range hood is off, the second main plate 23612 is gradually tilted downwards from front to back so that the condensed oil droplets can flow to the third main plate 23613 under gravity. Both the first main board 23611 and the second main board 23612 have ventilation holes 23614. Each main board can have multiple ventilation holes 23614, which are evenly spaced along the left and right direction of the range hood. The ventilation holes 23614 are flanged holes to ensure the strength of the reinforcing plate 236 itself.

[0067] The bottom of the third main board 23613 is shaped like a figure eight, gradually sloping downwards from the center to the left and right sides, to guide the oil flowing down the third main board 23613 to the left and right sides. The bottom of the third main board 23613 has a backward-bent flange 23615, which further ensures the guidance of the oil flowing down the third main board 23613 to the left and right sides. The angle between the bottom of the third main board 23613 and the horizontal direction is K, and K ≥ 12°. In the horizontal projection, the left and right ends of the third main board 23613 are located outside the smoke inlet 21; that is, the left end is located to the left of the projection of the left edge of the smoke inlet 21, and the right end is located to the right of the projection of the right edge of the smoke inlet 21, to prevent oil droplets from dripping from the smoke inlet 21.

[0068] The connecting plate 2362 includes a connecting top plate 23621 and a connecting side plate 23622. The connecting top plate 23621 is used to connect with the first top plate 231 of the movable housing 23. It extends downwards gradually from front to back. When the range hood is closed, the angle between the connecting top plate 23621 and the horizontal direction is M, and M ≥ 12°. The connecting side plate 23622 is located on the side of the connecting top plate 23621 away from the main body 2361, and it is attached to the side panel 2342 of the panel 234.

[0069] A ventilation section is provided at the connection between the bottom surface of the upper housing 1 and the lower housing 2. This ventilation section includes a first ventilation opening 11 and a second ventilation opening 12 that are interconnected, with the second ventilation opening 12 located in front of the first ventilation opening 11. When the movable housing 23 rotates forward and opens, the second ventilation opening 12 also opens, thereby expanding the flow channel inside the lower housing 2 and widening the flow channel at the connection between the upper and lower housings, so that the fumes can quickly pass upward.

[0070] When the range hood is turned on, smoke can be introduced directly through the air inlet on the movable housing 23. Alternatively, as described in this embodiment, the lower housing may also include an air inlet plate 24 on the movable housing 23, with the aforementioned smoke inlet 21 formed on the air inlet plate 24. The movable housing 23 is tilted forward, and the negative pressure area formed by the smoke baffle 3 is slightly upward. To improve the smoke extraction effect, the negative pressure area needs to be lowered. Therefore, the aforementioned air inlet plate 24 is provided in this embodiment. When the range hood is turned on, the negative pressure area can be lowered into the area formed by the smoke baffle 3 and the air inlet plate 24.

[0071] The air inlet plate 24 includes a third top plate 241, a third left side plate 242, a third right side plate 243, and an air inlet plate body 244. The third top plate 241 extends from the top of the air inlet plate body 244 into the movable box 23. The third left side plate 242 extends from the left end of the air inlet plate body 244 into the movable box 23. The third right side plate 243 extends from the right end of the air inlet plate body 244 into the movable box 23. The air inlet plate 244 has the aforementioned smoke inlet 21.

[0072] After the negative pressure of the air intake is shifted and expanded outward by the air inlet plate 24, the oil fumes enter the bottom of the range hood at a high speed. After the oil fumes come into contact with the cold plate, they condense into condensed oil, thus forming outward run marks on the surface of the range hood, and even dripping onto the countertop. For this purpose, the movable housing 23 also includes an oil guide plate 237. An opening 2343 is formed between the lower panel 2341 and the side panel 2342 of the panel 234. When only the movable housing 23 constitutes the movable air intake component, this opening 2343 serves as the aforementioned smoke inlet 21. When the movable housing 23 and the air inlet plate 24 together constitute the movable air intake component, the opening 2343 allows the air inlet plate 24 to pass through, and the opening 2343 serves as the space for the air inlet plate 24 to move. When the range hood is in the open state, the lower edge of the smoke inlet 21 is almost flush with the lower edge of the opening 2343, and the air inlet plate 24 is close to or abuts against the lower edge of the opening 2343. The upper end of the oil guide plate 237 extends into the opening 2343, and the lower end of the oil guide plate 237 extends to the rear side of the lower panel 2341.

[0073] See Figure 4 , Figures 7-11 The oil guide plate 237 may include a first oil guide plate body 2371 and a second oil guide plate body 2372. The first oil guide plate body 2371 may have the same tilt angle as the lower panel 2341. The upper end of the first oil guide plate body 2371 extends into the opening 2343. The lower end of the first oil guide plate body 2371 is located on the rear side of the lower panel 2341. The second oil guide plate body 2372 gradually tilts downward from the lower end of the first oil guide plate body 2371. The transition position of the two plates may be lower than the lower edge of the opening 2343.

[0074] The first oil guide plate body 2371 of the oil guide plate 237 has folded edges 2373 on both the left and right sides corresponding to the side panel 2342. The folded edges 2373 are close to the side panel 2342 at the corresponding positions. Each folded edge 2373 has a bent portion 2374 at its bottom. The bent portion 2374 is located above the second oil guide plate body 2372 of the oil guide plate 237, so that it can flow backward along the upper surface of the second oil guide plate body 2372 to the rear end of the second oil guide plate body 2372.

[0075] During the opening and closing process, the minimum front-to-back gap between the air inlet plate 24 and the oil guide plate 237 is P( Figure 4The oil guide plate 237 has a height difference of Q ≤ 3mm between its upper end and the lower edge of the smoke inlet 21 on the air inlet plate 24, ensuring that frost condensation does not occur at the bottom of the air inlet plate 24. The gap between the first oil guide plate body 2371 and the lower panel 2341 of the oil guide plate 237 (which are parallel) is N, and N ≥ 3mm, to prevent oil from the oil guide plate 234 from contacting and contaminating the smoke baffle plate 3 when the smoke baffle plate 3 is closed.

[0076] The panel 234 also includes an oil guide strip 2344 disposed on the back of the lower panel 2341 facing the lower housing 2. The second oil guide plate 2372 can be parallel to the oil guide strip 2344, and the oil guide strip 2344 is located at intervals below the second oil guide plate 2372. When the range hood is in the closed and open states, on the horizontal plane projection, the projection of the rear end of the second oil guide plate 2372 is located within the projection of the oil guide strip 2344, and the projection of the rear end of the oil guide strip 2344 is located within the projection of the fixed housing 12.

[0077] The gap between the second oil guide plate 2372 and the oil guide strip 2344 is R, and it satisfies 2mm≤R≤10mm to allow the oil droplets to pass smoothly, while also improving assembly and fixation without adding parts.

[0078] Alternatively, the lower housing 2 may consist of only a fixed housing. In this case, the smoke baffle 3 can open and close the smoke inlet 21. The smoke baffle 3 can use existing motion mechanisms to open and close the smoke inlet 21. That is, at least one of the lower housing 2 and the smoke baffle 3 is a movable part.

[0079] Therefore, the range hood also includes a motion mechanism, which comprises a drive mechanism 61, a transmission mechanism 62, and a drive shaft 63. The drive mechanism 61 and the transmission mechanism 62 can employ existing mechanisms for driving the smoke baffle 3 to rotate, such as combinations of motors and linkage assemblies, or combinations of electric push rods and linkage assemblies. These combinations can also be used to drive the movable housing 23 of the lower housing 2. Alternatively, any existing mechanism capable of driving the movable housing 23 and / or the smoke baffle 3 to rotate can also be used.

[0080] Two transmission mechanisms 62 are arranged alternately on the left and right sides within the upper housing 1. A transmission shaft 63 is located within the upper housing 1 and extends in the left-right direction of the range hood. Both ends of the transmission shaft 63 are connected to one of the transmission mechanisms 62, ensuring synchronized and stable operation of the moving parts on both sides. The transmission shaft 63 is located above the first filter 5 and below the fan 4, i.e., within the channel through which the fumes pass. This results in the fumes flowing rapidly from bottom to top when the range hood is turned on, causing oil to accumulate on the transmission shaft 63. Due to the gap between the transmission shaft 63 and the first filter 5, oil spillage occurs. As the oil falls downwards, the first filter 5 cannot effectively catch it, causing it to drip into the vent 21.

[0081] Therefore, the range hood also includes a second filter 7, which is disposed between the drive shaft 63 and the first filter 5, and is used to guide the oil on the drive shaft 63 to the first filter 5. By setting the second filter 7, it acts as a transition between the drive shaft 63 and the first filter 5, guiding the oil on the drive shaft 63 to the first filter 5, and then guiding it downwards from the first filter 5. This ensures that the oil on the drive shaft 63 does not fall directly downwards to the first filter 5 and drip through it, reliably and effectively ensuring the direction of the oil on the drive shaft 63 and avoiding oil droplet splashing that may cause inconvenience to the user.

[0082] The second filter screen 7 gradually slopes upwards from front to back, with an angle C between it and the horizontal plane, satisfying C ≥ 12°, so that the oil on the second filter screen 7 can flow down to the lower front end. The angle between the first filter screen 5 and the second filter screen 7 is E, satisfying E ≤ 70°, thus ensuring that the second filter screen 7 smoothly guides the oil onto the first filter screen 5, and also ensuring that the fumes, after passing through the first filter screen 5, flow upwards through the second filter screen 7 with minimal air resistance. The projection of the front end of the second filter screen 7 onto the horizontal plane (projection direction see...) Figure 2 As indicated by arrow F (and this is an orthographic projection; the term "projection on the horizontal plane" in the following text refers to the same thing), the projection of the drive shaft 63 on the horizontal plane is within the projection range of the first filter screen 5, and the projection of the drive shaft 63 on the horizontal plane is within the projection range of the second filter screen 7, to ensure that the second filter screen 7 receives the oil on the drive shaft 63. The vertical distance between the lowest point of the second filter screen 7 and the first filter screen 5 is h, and h ≤ 10 mm. The height difference between the first filter screen 5 and the second filter screen 7, as defined above, prevents a large distance from causing oil to still float at the lower end of the second filter screen 7.

[0083] The first filter screen 5 has a first mesh 52, and the second filter screen 7 has a second mesh 71. The lower end of the second filter screen 7 is located in front of the first mesh 52 to prevent oil from being guided above the first mesh 52 and dripping through. An oil drain hole 72 is formed near the front end of the second filter screen 7. The oil drain hole 72 corresponds to the first solid portion 53 on the first filter screen 5 located between the first mesh 52, so that oil on the second filter screen 7 is guided downwards through the oil drain hole 72 onto the first filter screen 5 and can be guided backwards to avoid direct dripping. In this embodiment, both the first mesh 52 and the second mesh 71 are elongated holes and extend along the front-back direction. The first solid portion 53 of the first filter screen 5 is located between two adjacent first mesh 52s. The front end of the second filter screen 7 (the portion located before the second mesh 71) extends beyond the front end of the first mesh 52 of the first filter screen 5. The length of the extended portion is D, and D≥3mm, thereby preventing dripping from the front end of the second filter screen 7 down to the first mesh 52 due to the small distance.

[0084] The second filter 7 also includes a filter body 73 and a folded edge 74. The aforementioned second mesh 71 and oil leakage hole 72 are provided on the filter body 73. The folded edge 74 bends upward from the rear end of the filter body 73, thereby partially enclosing the drive shaft 63 by the rear end of the filter body 73 and the folded edge 74. The gap between the folded edge 74 and the drive shaft 63 is B, and satisfies: 1mm≤B≤5mm. The height of the folded edge 74 is A, and the radius of the drive shaft 63 is r, and satisfies A≥1 / 5r. By controlling the gap between the second filter 7 and the drive shaft 63 and the height of the folded edge 74, it is ensured that the oil fumes are decondensed by the second filter 7 first, while reducing the blocked air intake area. Furthermore, the oil floating on the drive shaft 63 is blocked by the folded edge 74 and guided to the filter body 73.

[0085] In addition, the projection of the smoke inlet 21 on the horizontal plane is located inside (behind) the projection of the front end (lower end) of the second filter screen 7 on the horizontal plane, to prevent oil droplets on the second filter screen 7 from dripping into the smoke inlet 21.

[0086] The fan 4 is a centrifugal fan, including a volute 41 and an impeller 42 disposed within the volute 41. An air inlet 43 is formed on the volute 41, and an oil drip nozzle 412 is provided at the bottom of the volute 41. The volute 41 includes two cover plates 411 arranged opposite each other along the axis X of the fan 4, and the air inlet 43 is formed on the cover plate 411. In this embodiment, the axis X of the fan 4 extends horizontally along the front-rear direction of the range hood, and the cover plates 411 are arranged at intervals. There are two air inlets 43, each formed on a corresponding cover plate 411. Alternatively, an air inlet 43 may only be provided on the rear cover plate 411. An air intake channel 44 is formed between the air inlet 43 of the fan 43 and the corresponding wall surface of the upper housing 1. When there are two air inlets 43, the rear air intake channel 44 is the main air intake channel. The projection of the rear end of the second filter 7 on the horizontal plane is located in front of the projection of the rear cover plate 411 on the horizontal plane. This prevents the second filter 7 from entering the rear air inlet channel 44 (the only air inlet channel or the main air inlet channel), thereby reducing the resistance when oil fumes pass through.

[0087] As mentioned earlier, the first filter 5 gradually slopes downwards from front to back, while the second filter 7 gradually slopes upwards from front to back. Therefore, when the fumes pass upwards through the first filter 5, the second filter 7 extends in the opposite direction relative to the first filter 5. This reduces the tendency of the first filter 5 to guide the fumes forward, instead guiding them backwards so that they flow towards the main air intake channel. This effectively reduces airflow resistance and ensures sufficient air intake area.

[0088] As can be seen from the above, the drive shaft 63 is an oil-driving component that may cause downward oil dripping as described in the above embodiments (its lowest point is its oil dripping position). Obviously, the volute 41 may also be configured as an oil-driving component, in which case the bottom of the volute 41 usually refers to the oil drip nozzle (not shown) as its oil dripping position. Alternatively, other oil-driving components may also exist, as described in the background art. The second filter 7 in this utility model is applicable to scenarios where there is a certain distance between such oil-driving components and the filter below.

[0089] As described above, the second vent 12 can be closed and opened. For this purpose, the range hood also includes a hinged plate 8, which is partially located inside the lower housing 2 and partially inside the upper housing 1. By providing the hinged plate 8, the ventilation area at the connection between the upper housing 1 and the lower housing 2 is increased when the range hood is on, thereby promoting the rapid rise of fumes and their intake by the fan 4 located inside the upper housing 1. When the range hood is off, the second vent 12 is closed, allowing the lower housing 2 to achieve an ultra-thin design. The hinged plate 8, partially located inside the lower housing 2, prevents fumes from leaking between the hinged plate 8 and the lower housing 2 when open, and guides any condensed oil on the hinged plate 8 downwards when closed, preventing seepage between the hinged plate 8 and the lower housing 2.

[0090] The hinged plate 8 includes a first plate 81 and a second plate 82. The first plate 81 is fixed to the back of the smoke baffle 3. The second plate 82 is connected to the first plate 81 and arranged at an angle. When the smoke baffle 3 is opened, the second plate 82 extends from top to bottom and backward into the upper box 1. When the smoke baffle 3 is closed, the second plate 82 is closed at the second ventilation opening 22, and the first plate 81 extends into the lower box.

[0091] The hinged panel 8 also includes a third panel 83, which is connected to the second panel 82 and arranged at an angle. When the smoke baffle 3 is closed, the third panel 83 extends upward from the front end of the second panel 82. The presence of the third panel 83 can play a role in catching oil when the range hood is closed, preventing the oil on the second panel 82 from flowing forward, but only allowing it to flow along the third panel 83, the second panel 82, and the first panel 81 until it flows into the lower housing. When the hinged panel 8 is open, the upper end of the hinged panel 8 (from...) Figure 2 The projection of the cross section shown (considered as the upper end) onto the horizontal plane onto the lower end (from...) Figure 2 The outer side of the cross-section shown (viewed as the lower end point) is the upper end of the movable box 23 after it is opened (from...). Figure 2 The projection of the cross section shown (considered as the upper end) onto the horizontal plane onto the lower end (from...) Figure 2 The cross section shown is considered to be the outer side of the projection of the lower endpoint.

[0092] The transmission mechanism 62 includes a drive arm 621 driven to rotate by a drive mechanism 61. The drive arm 621 is rotatably connected to the upper housing 1, and its rotation center is located on the upper housing 1. The opening and closing plate 8 also includes a fourth plate 84 disposed on the left and right sides of the second plate 82 and the third plate 83. By providing the fourth plate 84, the sealing performance with the left and right sides of the upper housing 1 is improved. The fourth plate 84 extends from the left and right sides of the second plate 82 and the third plate 83, respectively. The drive arm 621 is fixedly disposed on the inner side of the fourth plate 84. The drive arm 621 may have two sets disposed on the left and right sides of the opening and closing plate 8. The drive mechanism 61 drives one of the drive arms 621 to rotate, and the aforementioned transmission shaft 624 is connected between the two drive arms 621 to achieve synchronous rotation. Thus, the drive mechanism 61 can drive the smoke baffle 3 and the opening and closing plate 8 to rotate. The smoke baffle 3 and the opening and closing plate 8 are fixed on a drive arm 621 of the motion mechanism, so that the drive arm 621 of the motion mechanism, the smoke baffle 3 and the opening and closing plate 8 rotate together around the rotation point of the upper housing 1. The opening and closing plate 8 opens when the smoke baffle 3 opens, and the structural and cost costs are relatively small.

[0093] The transmission mechanism 62 also includes a connecting rod 622, one end of which is rotatably connected to the drive arm 621, and the other end of which is rotatably connected to the movable housing 23, such as to the reinforcing plate 236 of the movable housing 23. Thus, the movable housing 23 is linked with the smoke baffle 3 and the opening and closing plate 4. Alternatively, the movable housing 23 can also be driven independently.

[0094] The air inlet plate 24 can also rotate relative to the movable housing 23. It can be driven independently, or, as shown in this embodiment, the air inlet plate 24 can be rotatably connected to the movable housing 23 on the left and right sides near the bottom via rotating shafts, and the connection points can slide up and down (this is prior art, see the Chinese patent application number 202221530291.1 disclosed by the applicant). Near the top, such as at the bend between the third top plate 241 and the air inlet plate 244, the air inlet plate 244 is connected to the motion mechanism. The transmission mechanism also includes a rotating shaft 623 connected to the drive arm 621. The rotating shaft 623 extends along the left and right direction of the range hood, rotatably connecting the drive arm 621 and the air inlet plate 24, and can drive the air inlet plate 24 to rotate when the drive arm 621 rotates. To facilitate the accommodation of the rotating shaft 623, a notch 245 can be provided on the air inlet plate 24. When the range hood is turned off, the air inlet plate 24 is retracted into the movable housing 23. When the range hood is turned on, the air inlet plate 24 rotates forward to be exposed in the movable housing 23. At this time, the third top plate 241, the third left side plate 242, and the third right side plate 243 are located in the movable housing 23 at least at the rear end to avoid pressure leakage from the top and the left and right sides.

[0095] The range hood also includes a functional module 10 located at the bottom of the upper housing 1. This functional module 10 can be a camera, sensor, lighting device, etc. The aforementioned second vent 12 is located on the rear side of the functional module 10. The rear edge of the functional module 10 can directly form the front edge of the second vent 12, or an installation opening can be provided at the bottom of the upper housing 1 to install the functional module. In this embodiment, the functional module 10 is a lighting device, and its rear edge can directly form the front edge of the second vent 12. When the opening and closing plate 8 closes the second vent 12, its second plate 82 is approximately flush with the bottom surface of the functional module 10, and the horizontal gap between the front end of the second plate 82 and the rear end of the functional module 10 is between 3mm and 5mm.

[0096] In this embodiment, the rear side of the functional module 10 is inclined downwards from front to back. During the movement of the opening and closing plate 8 (rotating around the center of the transmission shaft 63), the trajectory of its lowest point R (in this embodiment, the transition position between the second plate 82 and the third plate 83) is as follows: Figure 3(shown as dashed arc L1) It is necessary to ensure a certain safety gap with the rear side of the functional module 10. The safety gap d satisfies: 1.5mm≤d≤3mm.

[0097] The movement trajectory of the drive arm 621 is aligned with the movement trajectory of the opening and closing plate 8. The lower end of the drive arm 621 has a barb 6211, and the rotating shaft 623 is connected to the barb 6211. This ensures that the lowest point in the vertical direction (the lowest point where the condensed oil accumulates on the drive arm 621) can be completely received by the air inlet plate 24 without dripping onto the stove.

[0098] The first filter screen 5 also includes a second solid portion 54, which is located on the front side of the integral formed by the first mesh 52 and the first solid portion 53. The range hood also includes a bottom wing plate 9, which is disposed at the bottom of the first filter screen 5. The bottom wing plate 9 includes a first wing plate 91 and a second wing plate 92. The first wing plate 91 can fit against the bottom surface of the second solid portion 54, and the second wing plate 92 extends rearward and gradually downward from the rear end of the first wing plate 91. Preferably, the rear end of the first wing plate 91 does not exceed the rear end of the second solid portion 54 to avoid obstructing the first mesh 52. Preferably, the rear end of the second wing plate 92 can be located below the first mesh 52.

[0099] The first wing plate 91 can guide the oil on the lower surface of the second solid part 54 to flow backward to the second wing plate 92, and drip onto the opening and closing plate 8 through the second wing plate 92 when the range hood is closed, especially onto the second plate body 82 of the opening and closing plate 8. That is, when the range hood is closed, the rear end of the second wing plate 92 is located above the second plate body 82 of the opening and closing plate 8, the angle between the second wing plate 92 and the horizontal direction is H, and H≥12° is satisfied. The rear end of the second wing plate 92 is located behind the front end of the opening and closing plate 8, and the horizontal distance between the two is G, and G≥3mm is satisfied, thereby preventing the oil from spreading. At the same time, the height difference between the rear end of the second wing plate 92 and the front end of the opening and closing plate 8 is F, and F≤3mm is satisfied.

[0100] When the range hood is turned on, the upper end of the third plate 83 of the opening and closing plate 8 can be close to or abut against the lower surface of the first wing plate 91 to avoid pressure leakage at this point. When close, the gap between the two is J, and satisfies 0.5mm≤J≤3mm. Preferably, a foam strip (not shown) can be provided on the lower surface of the first wing plate 91 to press it tightly against the opening and closing plate 8 for better sealing.

[0101] In summary, the range hood of this invention requires a step-by-step oil path connection from top to bottom. The condensed oil on the drive shaft 63 is collected by the second oil screen 7, and the oil at the lowest point of the second oil screen 7 is then collected by the opening and closing plate 8. The height difference between the lowest point of the second oil screen 7 and the second plate 82 of the opening and closing plate 8 is ≤100mm to prevent oil droplets from scattering due to wind force and to prevent splashing from excessively high droplets. Subsequently, since there is also condensed oil on the connecting rod 622 of the moving mechanism, the connecting rod 622 tilts downwards from front to back when the range hood is closed. The vertical projection of the riveting point between the connecting rod 622 and the drive arm 621 should be within the effective receiving range of the air inlet plate 24 to prevent dripping through (avoiding downward alignment with the smoke inlet 21). The lowest point R of the movement trajectory of the opening and closing plate 8 must also be within the vertical projection receiving range of the air inlet plate 24 to prevent dripping through. The connection between the connecting rod 622 and the reinforcing plate 236 is located at the upper end of the reinforcing plate 236. Its vertical projection is the solid of the reinforcing plate 236 receiving the oil droplets, and then guiding them to both sides through the figure-eight design of the reinforcing plate 236.

[0102] Both the aforementioned fan 4 and drive mechanism 61 can be controlled by intelligent voice. Therefore, the range hood can be equipped with an intelligent voice control module, which includes a controller, a voice receiving module, and a voice parsing module. The voice receiving module can receive user commands, and the voice parsing module can parse the commands. Based on the parsed commands, the module can control the range hood to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience of using the range hood of this utility model.

Claims

1. A range hood, comprising: The upper box (1) has an open bottom for the entry of cooking fumes; The oil dripping component is located inside the upper housing (1); as well as The first filter screen (5) is disposed inside the upper housing (1) and located below the oil dripping component; characterized in that: The upper housing (1) is also provided with a second filter (7) for guiding the oil dripping from the oil-dripping component to the first filter (5).

2. The range hood according to claim 1, characterized in that: The first filter (5) is gradually tilted downward from front to back, and the second filter (7) is gradually tilted upward from front to back. The projection of the front end of the second filter (7) on the horizontal plane is within the projection range of the first filter (5), and the projection of the oil dripping position of the oil dripping component on the horizontal plane is within the projection range of the second filter (7).

3. The range hood according to claim 2, characterized in that: The vertical height between the lowest point of the second filter (7) and the first filter (5) is h, and h ≤ 10 mm.

4. The range hood according to claim 2, characterized in that: The included angle between the second filter (7) and the first filter (5) is E, and E ≤ 70°.

5. The range hood according to claim 1, characterized in that: The second filter (7) is gradually tilted upward from front to back. The first filter (5) has a first mesh (52). The front end of the second filter (7) is located in front of the first mesh (52).

6. The range hood according to claim 5, characterized in that: The second filter screen (7) has an oil leakage hole (72) near the front end, and the oil leakage hole (72) corresponds to the first solid part (53) on the first filter screen (5) located between the first mesh holes (52).

7. The range hood according to claim 5, characterized in that: The second filter (7) has a second mesh (71), and the portion of the second filter (7) before the second mesh (71) extends beyond the front end of the first mesh (52) of the first filter (5). The length of the portion of the second filter (7) extending beyond the first mesh (52) is D, and D≥3mm.

8. The range hood according to claim 1, characterized in that: The upper housing (1) is equipped with a fan (4), which includes a volute (41). The volute (41) includes a cover plate (411) arranged at the front and rear. The rear cover plate (411) is provided with an air inlet (43). The projection of the rear end of the second filter (7) on the horizontal plane is located in front of the projection of the rear cover plate (411) on the horizontal plane.

9. The range hood according to claim 8, characterized in that: The first filter (5) gradually tilts downward from front to back, and the second filter (7) gradually tilts upward from front to back.

10. The range hood according to claim 8, characterized in that: The volute (41) of the fan (4) constitutes the oil dripping component, and the bottom of the volute (41) is provided with an oil dripping nozzle as the oil dripping position.

11. The range hood according to claim 1, characterized in that: The range hood also includes a movable part located below the upper housing (1) and a motion mechanism for driving the movable part. The motion mechanism includes a drive mechanism (61), a transmission mechanism (62) and a transmission shaft (63). The transmission mechanism (62) has two parts arranged on the left and right sides inside the upper housing (1). The transmission shaft (63) is connected between the two transmission mechanisms (62) and constitutes the oil dripping part.

12. The range hood according to claim 11, characterized in that: The range hood also includes a fixed housing (22) located below the upper housing (1) and a movable housing (23) that rotates relative to the fixed housing (22), wherein the movable housing (23) is configured as the movable component described above.

13. The range hood according to claim 12, characterized in that: The movable housing (23) includes a U-shaped panel (234), the panel (234) includes a lower panel (2341) and side panels (2342) located on the left and right sides of the lower panel (2341). The movable housing (23) also includes a reinforcing plate (236) connected between the two side panels (2342). The transmission mechanism (62) includes a drive arm (621) driven by a drive mechanism (61) to rotate relative to the upper housing (1) and a connecting rod (622) whose two ends are respectively rotatably connected to the drive arm (621) and the reinforcing plate (236).

14. The range hood according to claim 13, characterized in that: The reinforcing plate (236) includes a main body (2361), which includes a first main plate (23611) extending from top to bottom, a second main plate (23612) extending rearward from the lower end of the first main plate (23611), and a third main plate (23613) extending downward from the rear end of the second main plate (23612). When the range hood is in the closed state, the second main plate (23612) is in a state of gradually tilting downward from front to back.

15. The range hood according to claim 13, characterized in that: The reinforcing plate (236) includes a main body (2361) and a connecting plate (2362). There are two connecting plates (2362) located on the left and right sides of the main body (2361). The movable box (23) includes a first top plate (231). The connecting plate (2362) includes a connecting top plate (23621) connected to the first top plate (231). The side panel (2342) extends along the front-back direction of the range hood. The connecting plate (2362) also includes a connecting side plate (23622) located on the side of the connecting top plate (23621) away from the main body (2361). The connecting side plate (23622) is located on the side of the connecting top plate (23621) away from the main body (2361) and fits against the side panel (2342) of the panel (234).

16. The range hood according to claim 11, characterized in that: The second filter (7) includes a filter body (73) and a folded edge (74). The folded edge (74) bends upward from the rear end of the filter body (73), thereby partially enclosing the drive shaft (63) with the rear end of the filter body (73) and the folded edge (74). The gap between the folded edge (74) and the drive shaft (63) is B, and satisfies: 1mm≤B≤5mm. The height of the folded edge (74) is A, and the radius of the drive shaft (63) is r, and satisfies A≥1 / 5r.

17. The range hood according to claim 1, characterized in that: The range hood also includes a lower housing (2), and a smoke inlet (21) is provided on the front side of the lower housing (2). The projection of the smoke inlet (21) on the horizontal plane is located inside the projection of the lower end of the second filter (7) on the horizontal plane.

18. The range hood according to claim 1, characterized in that: The range hood also includes a lower housing (2) disposed below the upper housing (1) for smoke intake. A ventilation section is provided at the connection between the bottom surface of the upper housing (1) and the lower housing (2). This ventilation section includes a first ventilation opening (11) and a second ventilation opening (12) that are interconnected. The second ventilation opening (12) is located before the first ventilation opening (11). The range hood also includes an opening and closing plate (8). When the range hood is in the closed state, the opening and closing plate (8) closes the second vent (12). When the range hood is in the open state, the opening and closing plate (8) opens the second vent (12). The bottom surface of the first filter screen (5) is provided with a bottom wing plate (9) for guiding the oil of the first filter screen (5) to the opening and closing plate (8).

19. The range hood according to claim 18, characterized in that: The first filter screen (5) gradually slopes downward from front to back. The first filter screen (5) includes a first mesh (52) and a second solid part (54) located in front of the first mesh (52). The bottom wing plate (9) includes a first wing plate (91) and a second wing plate (92). The first wing plate (91) is attached to the bottom surface of the second solid part (54). The second wing plate (92) extends backward and gradually slopes downward from the rear end of the first wing plate (91). When the range hood is in the closed state, the rear end of the second wing plate (92) is located above the opening and closing plate (8).

20. The range hood according to claim 1, characterized in that: The range hood also includes a lower housing (2), which includes a fixed housing (22) and a movable air intake component that moves relative to the fixed housing (22). The movable air intake component includes a movable housing (23) that rotates relative to the fixed housing (22) about an axis extending in the left-right direction of the range hood, and an air inlet plate (24) that can open forward and close backward relative to the movable housing (23). A smoke inlet (21) is formed on the air inlet plate (24).

21. The range hood according to claim 20, characterized in that: The movable housing (23) includes a front panel (234), which includes a lower panel (2341) and an opening (2343) above the lower panel (2341) for the air inlet plate (24) to pass through; the lower housing (2) also includes an oil guide plate (237), which is located between the air inlet plate (24) and the lower panel (2341).

22. The range hood according to claim 21, characterized in that: When the air inlet plate (24) is in the open state, the height difference between the upper end of the oil guide plate (237) and the lower edge of the smoke inlet (21) on the air inlet plate (24) is Q, and Q≤3mm.

23. The range hood according to claim 21, characterized in that: The oil guide plate (237) includes a first oil guide plate body (2371) and a second oil guide plate body (2372). The upper end of the first oil guide plate body (2371) extends into the opening (2343). The lower end of the first oil guide plate body (2371) is located on the rear side of the lower panel (2341). The second oil guide plate body (2372) gradually slopes downward from the lower end of the first oil guide plate body (2371). The transition position of the two plates is lower than the lower edge of the opening (2343).

24. The range hood according to claim 20, characterized in that: The range hood also includes a motion mechanism, which includes a drive mechanism (61), a drive arm (621) driven by the drive mechanism (61) to rotate relative to the upper housing (1), and a connecting rod (622) whose two ends are respectively rotatably connected to the drive arm (621) and the movable housing (23). The motion mechanism also includes a rotating shaft (623) that rotatably connects the drive arm (621) and the air inlet plate (24).

25. The range hood according to claim 24, characterized in that: The air inlet plate (24) is provided with a notch (245) for accommodating the rotating shaft (623), and the lower end of the drive arm (621) is formed with a barb (6211), and the rotating shaft (623) is connected to the barb (6211).

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