A range hood

Abstract

The utility model discloses a kind of range hood, including lower box, the lower box includes fixed box and the movable air inlet component moving opposite fixed box, the movable air inlet component includes movable box rotating opposite fixed box around axis along the left and right direction of range hood;The lower box further includes the air inlet plate that can be opened forward and closed backward opposite movable box, the air inlet plate is formed with smoke inlet, the movable box includes the panel located front, and the panel includes lower panel and the opening for the air inlet plate to enter and exit above lower panel;The lower box further includes oil guide plate, and the oil guide plate is located between air inlet plate and lower panel.

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] A range hood is a kitchen appliance that purifies the kitchen environment. It can quickly remove waste from the stove and fumes produced during cooking and exhaust them outdoors, reducing pollution and purifying the air.

[0004] Current side-draft range hoods, in order to ensure effective smoke extraction, tend to be quite bulky in appearance. This leads to issues with cookware, such as the cooktop not being too close to the hood body during installation, and also imposes implicit constraints on the size of the cookware—it cannot be too large or too tall. Furthermore, the current development trend of side-draft range hoods is towards ultra-thin designs. However, making the casing of a side-draft range hood too thin would reduce the effective area of ​​the air intake, thus affecting the smoke extraction effect. Widening it horizontally would result in disproportionate proportions, while increasing its depth would affect the size of the cookware and its installation position, making it impossible to achieve an ultra-thin design overall.

[0005] To expand the smoke collection range and improve the fume extraction effect, a common solution is to use nested housings, pushing or rotating the movable housing out to increase the thickness of the housing, expand the air intake channel, and bring the negative pressure zone closer to the cooking area. For example, Chinese Patent Application No. 202322060839.1 discloses a range hood that includes a smoke collection hood, within which a smoke collection chamber shell is rotatably connected to the bottom of the smoke collection hood. A smoke baffle is provided on one side of the smoke collection hood, and a drive assembly is provided inside the smoke collection hood. The drive assembly is connected to the smoke baffle, and the smoke baffle is connected to the smoke collection chamber shell via a linkage. The drive assembly can drive the smoke baffle to open and close, and the smoke baffle can, via the linkage, drive the smoke collection chamber shell to rotate towards the area to be extracted or retract into the smoke collection hood. A drive mechanism for driving the smoke baffle is provided inside the smoke collection hood.

[0006] This type of range hood, when turned on, increases the air intake cavity by rotating the smoke collection chamber shell forward, providing space for the fumes to buffer and improving the smoke collection effect. When the range hood is turned off, the depth of the smoke collection hood decreases, allowing it to achieve the thinnest possible shape. By using the moving smoke collection chamber shell to shift and expand the negative pressure of the range hood's air intake, the fumes quickly enter from the lower edge of the air inlet and come into contact with the cooler components, rapidly condensing into condensed oil. This creates runners on the range hood surface and may even drip onto the countertop.

[0007] Therefore, further improvements are needed. Utility Model Content

[0008] 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 ensures the collection of oil from the movable air intake components while ensuring the effectiveness of oil fume extraction.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a range hood, including a lower box, the lower box including a fixed box and a movable air intake component that moves relative to the fixed box, the movable air intake component including a movable box that rotates relative to the fixed box about an axis extending along the left and right direction of the range hood;

[0010] Its features are:

[0011] The lower housing also includes an air inlet plate that can be opened forward and closed backward relative to the movable housing. A smoke inlet is formed on the air inlet plate. The movable housing includes a front panel, which includes a lower panel and an opening on the lower panel for the air inlet plate to pass through.

[0012] The lower housing also includes an oil guide plate, which is located between the air inlet plate and the lower panel.

[0013] Because the air inlet plate shifts and expands the negative pressure of the air intake, the oil fumes enter the bottom of the range hood at a very fast flow rate. After the oil fumes come into contact with the cold plate, they are condensed into condensed oil. By setting up an oil guide plate, the oil fumes at the lower edge of the smoke inlet on the air inlet plate can be guided into the movable box. While ensuring the smoke extraction effect, it ensures that the oil in the movable air intake components is collected, thus avoiding the formation of external run marks on the surface of the range hood.

[0014] 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.

[0015] Furthermore, the range hood also includes a smoke baffle capable of opening and closing the smoke inlet; the oil guide plate includes a first oil guide plate body parallel to the lower panel and a second plate body extending rearward and gradually downward from the lower end of the first oil guide plate body;

[0016] When the air inlet plate is in the open state, the gap between the first oil guide plate body and the lower panel of the oil guide plate is N, and N≥3mm, so as to prevent the oil of the oil guide plate from contacting the smoke baffle and contaminating the smoke baffle when the smoke baffle is closed.

[0017] 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.

[0018] Furthermore, the panel also includes side panels located above the left and right sides of the lower panel. The left and right sides of the first oil guide plate body of the oil guide plate are provided with folded edges at positions corresponding to the side panels. The folded edges are close to the side panels at the corresponding positions, thereby ensuring that the oil flowing down from the side panels is received and guided by the oil guide plate.

[0019] Furthermore, in order to guide the oil on the folded edge to the second oil guide plate body, a bend is formed at the bottom of each folded edge, and the bend is located above the second oil guide plate body of the oil guide plate.

[0020] Furthermore, the minimum front-to-back gap between the air inlet plate and the oil guide plate is P, and it satisfies 1mm≤P≤3mm to ensure that the user's hand will not be pinched when wiping, and at the same time to ensure that the movement will not interfere with the shaking.

[0021] Furthermore, to facilitate the guidance of oil stains on the back side of the front panel located below the lower edge of the opening, the panel also includes an oil guide strip disposed on the back side of the lower panel facing the lower housing, the oil guide strip being spaced apart below the second oil guide plate.

[0022] Furthermore, the gap between the second oil guide plate and the oil guide strip is R, and it satisfies 2mm≤R≤10mm to ensure the smooth passage of oil droplets, while also improving assembly and fixation without increasing the number of parts.

[0023] Compared with the prior art, the advantages of this utility model are as follows: After the air inlet plate moves and expands the negative pressure of the air inlet, the oil fumes enter the bottom of the range hood at a very fast flow rate. After the oil fumes come into contact with the cold plate, they are condensed into condensed oil. By setting an oil guide plate, the oil fumes at the lower edge of the smoke inlet on the air inlet plate can be guided into the movable box. Under the premise of ensuring the smoke extraction effect, the oil of the movable air inlet component is collected, thus avoiding the formation of external flow marks on the surface of the range hood. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the range hood in the open state according to an embodiment of the present utility model;

[0025] 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;

[0026] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0027] Figure 4 for Figure 2 A magnified schematic diagram of part II;

[0028] 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;

[0029] 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);

[0030] 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;

[0031] 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;

[0032] 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;

[0033] 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;

[0034] Figure 11 for Figure 10 A magnified schematic diagram of part III;

[0035] 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;

[0036] 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;

[0037] Figure 14 This is a schematic diagram of the range hood in the off state according to an embodiment of the present utility model;

[0038] 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. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] See Figures 1-15 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] See Figure 4 , Figures 7-11The 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.

[0056] 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.

[0057] 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 4 The oil guide plate 237 is open, and the height difference Q 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 ≤3mm to ensure that the user's hand will not be pinched when wiping, and to ensure that there is no interference or shaking during the movement. When the air inlet plate 24 is open, the height difference Q between the upper end of the oil guide plate 237 and the lower panel 2341 on the air inlet plate 24 is ≤3mm to ensure that there is no double-stage condensation 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 (the two are parallel) is N, and N≥3mm to prevent the oil on the oil guide plate 234 from contacting and contaminating the smoke baffle plate 3 when the smoke baffle plate 3 is closed.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 2As 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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 a lower housing (2), the lower housing (2) comprising a fixed housing (22) and a movable air intake component that moves relative to the fixed housing (22), the movable air intake component comprising a movable housing (23) that rotates relative to the fixed housing (22) about an axis extending along the left and right direction of the range hood; Its features are: The lower housing (2) also includes an air inlet plate (24) that can be opened forward and closed backward relative to the movable housing (23). The air inlet plate (24) has a smoke inlet (21). The movable housing (23) includes a front panel (234). The front panel (234) includes a lower panel (2341) and an opening (2343) above the lower panel (2341) for the air inlet plate (24) to enter and exit. 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).

2. The range hood according to claim 1, 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.

3. The range hood according to claim 1, characterized in that: The range hood also includes a smoke baffle (3) that can open and close the smoke inlet (21); the oil guide plate (237) includes a first oil guide plate body (2371) parallel to the lower panel (2341) and a second oil guide plate body (2372) extending backward and gradually downward from the lower end of the first oil guide plate body (2371). When the air inlet plate (24) is in the open state, the gap between the first oil guide plate body (2371) and the lower panel (2341) of the oil guide plate (237) is N, and satisfies N≥3mm.

4. The range hood according to claim 1, 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).

5. The range hood according to claim 4, characterized in that: The panel (234) also includes side panels (2342) located on the left and right sides of the lower panel (2341). The first oil guide plate body (2371) of the oil guide plate (237) has folded edges (2373) on the left and right sides corresponding to the side panels (2342). The folded edges (2373) are close to the side panels (2342) at the corresponding positions.

6. The range hood according to claim 5, characterized in that: Each fold (2373) has a bend (2374) at its bottom, the bend (2374) being located above the second oil guide plate body (2372) of the oil guide plate (237).

7. The range hood according to claim 1, characterized in that: The minimum front-to-back gap between the air inlet plate (24) and the oil guide plate (237) is P, and satisfies 1mm≤P≤3mm.

8. The range hood according to claim 4, characterized in that: The panel (234) also includes an oil guide strip (2344) disposed on the back of the bottom panel (2341) facing the lower housing (2), the oil guide strip (2344) being spaced below the second oil guide plate (2372).

9. The range hood according to claim 8, characterized in that: The gap between the second oil guide plate (2372) and the oil guide strip (2344) is R, and satisfies 2mm≤R≤10mm.

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