A type of range hood

Abstract

This invention discloses a range hood, including a smoke collection hood with a first air inlet and a second air inlet arranged left and right. The range hood also includes a first smoke guide plate and a second smoke guide plate. The first and second smoke guide plates can be in at least two states: a closed state, in which the first smoke guide plate closes the first air inlet and the second smoke guide plate closes the second air inlet, with the ends of the two smoke guide plates that are close to each other being the first ends and the ends that are far apart being the second ends, and the first ends are constrained within the smoke collection hood; and an open state, in which the first and second smoke guide plates are closed to open the first and second air inlets, with each of the first and second smoke guide plates at least partially located below the smoke collection hood, and the second ends located below the smoke collection hood.

Description

Technical Field

[0001] This invention 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 cooking fumes and a filter to remove some grease particles. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outdoors.

[0003] Existing top-mounted range hoods typically have their air inlets positioned directly above the cooktop. During cooking, cooking fumes exhibit physical phenomena such as sizzling, rising, and spreading, causing fumes to escape. To address this, a smoke guide plate is usually installed below the air inlet. Utilizing the wall adhesion effect (also known as the Coanda effect), this effectively adsorbs the fluid, causing it to deviate from its original flow direction and flow along the surface of the object. For example, Chinese Patent Application No. 201811419513.0 discloses a range hood comprising: a range hood body with an air inlet; and at least two smoke guide plates that combine to cover the air inlet.

[0004] Existing side-draft range hoods also typically utilize the wall-attachment effect to incorporate airflow guiding components. These components are often designed to guide airflow from the lower rear side of the range hood to the upper front side of the range hood. For example, Chinese Patent Application No. 202020663406.9 discloses a side-draft range hood that includes a housing with a smoke collection chamber, a front panel, a first smoke baffle, and a second smoke baffle. The front panel includes a first panel and a second panel. The first panel has a first smoke inlet, and the second panel extends from the lower end of the first panel into the smoke collection chamber and has a second smoke inlet. The first smoke baffle is rotatably connected to the housing and located in front of the first panel, used to open and close the first smoke inlet. The second smoke baffle is rotatably connected to the housing and located below the second panel, used for the second smoke inlet. The problems with this type of flow guide are: ① The fumes will still escape to the left and right sides during the process of being absorbed and rising from the front and back; ② A large amount of oil condenses on the flow guide, increasing the difficulty of cleaning and the risk of oil dripping; ③ The fumes gradually cool down during the rising process, and are further cooled after being condensed on the wall of the flow guide, which reduces the rising force and reduces the smoke extraction effect.

[0005] Currently, the noise of range hoods mainly comes from aerodynamic noise, mechanical noise, and electromagnetic noise, with aerodynamic noise being the primary source. Aerodynamic noise includes rotational noise and eddy current noise, with rotational noise being the main source. Rotational noise is inevitably generated by the structure itself under high-speed rotation. Simply changing the structure of the fan system (such as the trailing edge of the blades, the volute, the impeller disc, the volute profile, etc.) can generally only reduce noise by less than 0.5dB. This is because, to achieve a certain airflow while maintaining performance, a certain rotational speed must be reached. Under high-speed rotation, there will inevitably be rotational noise, and 70% of the noise we hear comes from rotational noise.

[0006] Therefore, a better noise reduction measure is usually to apply passive noise reduction, such as the range hood with a noise reduction structure disclosed in Chinese Patent Application No. 202223002443.3. The range hood has an inner sealing box inside its outer shell; the fan is located inside the inner sealing box; the exhaust port of the fan extends through the inner sealing box to the outside of the range hood outer shell; and multiple micropores are evenly distributed between the side walls of the inner sealing box.

[0007] These micropores do provide some sound absorption and noise reduction. However, the noise reduction frequency band covered by micropores is usually narrow. Range hoods operate under diverse conditions in actual use, and they also have multiple speed settings. These factors cause variations in airflow speed, noise frequency, and peak noise range. Furthermore, with prolonged use, the micropores are prone to clogging, leading to a decrease in noise reduction effectiveness.

[0008] In addition, steam cooking or boiling water to steam rice generates a large amount of high-temperature steam, which is usually extracted by range hoods and discharged outdoors. However, this high-temperature steam has a good cleaning effect, and if it can be utilized, it can reduce energy waste and improve the reuse of water resources. Summary of the Invention

[0009] The first technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that reduces the spread of oil fumes and improves the oil fume extraction effect.

[0010] The second technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that can be adjusted to the corresponding noise reduction frequency band under different operating conditions of the range hood, thereby reducing noise and improving the cooking experience.

[0011] The third technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that uses high-temperature steam generated during steam cooking to clean the noise reduction holes, thereby reducing the risk of the noise reduction holes of the noise reduction device being blocked.

[0012] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a range hood, including a smoke collection hood, wherein the smoke collection hood is provided with a first air inlet and a second air inlet arranged on the left and right sides;

[0013] The range hood further includes a first smoke guide plate and a second smoke guide plate; characterized in that:

[0014] The first smoke guide plate and the second smoke guide plate can be in at least two of the following states:

[0015] In the closed state, the first smoke guide plate closes the first air inlet, and the second smoke guide plate closes the second air inlet. The ends of the two smoke guide plates that are close to each other are their respective first ends, and the ends of the two smoke guide plates that are far apart from each other are their respective second ends. The first ends are constrained within the smoke collection hood.

[0016] In the open state, the first smoke guide plate and the second smoke guide plate close together to open the first air inlet and the second air inlet. The first smoke guide plate and the second smoke guide plate are each at least partially located below the smoke collection hood, and the second end is located below the smoke collection hood.

[0017] By setting two smoke guide plates, the corresponding air inlets are closed when closed, and when open, the first ends of each of the two smoke guide plates are constrained inside the smoke collection hood, while the second ends of each extend downwards into the path of the rising fumes, causing the fumes to be deflected and flow towards the middle smoke guide plate. The two smoke guide plates play a role in adhering to the wall and guiding the flow, thereby reducing the diffusion of fumes and improving the smoke extraction effect.

[0018] Furthermore, the first smoke guide plate includes a first smoke guide plate body and a first surrounding plate surrounding the outer peripheral edge of the first smoke guide plate body, and the second smoke guide plate includes a second smoke guide plate body and a second surrounding plate surrounding the outer peripheral edge of the second smoke guide plate body;

[0019] In the closed state, the first and second smoke guide plates are concave upwards. Therefore, in the closed state, they not only close the air inlet but also prevent moisture diffusion.

[0020] Preferably, in order to minimize the gap between the two smoke guide plates while avoiding interference when the smoke guide plates rotate, the first enclosure plate surrounds the edge of the first smoke guide plate body except for the first end, and the second enclosure plate surrounds the edge of the second smoke guide plate except for the first end.

[0021] To reduce noise generated during the operation of the range hood, the range hood further includes a first noise reduction plate and a second noise reduction plate, wherein the first noise reduction plate is at least partially located within the first smoke guide plate, and the second noise reduction plate is at least partially located within the second smoke guide plate.

[0022] Furthermore, to facilitate the installation of noise reduction plates, the first smoke guide plate includes a first smoke guide plate body and a first surrounding plate surrounding the outer peripheral edge of the first smoke guide plate body. The second smoke guide plate includes a second smoke guide plate body and a second surrounding plate surrounding the outer peripheral edge of the second smoke guide plate body. The first surrounding plate surrounds the edge of the first smoke guide plate body except for the first end, and the second surrounding plate surrounds the edge of the second smoke guide plate body except for the first end.

[0023] The first smoke guide plate body includes a first outer plate and a first inner plate, and the second smoke guide plate body includes a second outer plate and a second inner plate. In the closed state, the first inner plate is located below the first outer plate, and the second inner plate is located below the second outer plate.

[0024] The first noise reduction plate is at least partially located between the first outer plate and the first inner plate, and the second noise reduction plate is at least partially located between the second outer plate and the second inner plate. The first noise reduction plate and the second noise reduction plate are each provided with a first noise reduction hole.

[0025] Furthermore, to facilitate the formation of a noise reduction cavity, a first cavity plate is provided on the end of the first noise reduction plate near the end of the first noise reduction plate located outside the body of the first smoke guide plate, and a second cavity plate is provided on the end of the second noise reduction plate near the end of the second noise reduction plate located outside the body of the second smoke guide plate.

[0026] In the open state, the ends of the first and second partition plates away from their respective noise reduction plates abut against each other, thereby forming a first noise reduction cavity between the first noise reduction plate, the second noise reduction plate, the first inner plate, the second inner plate, the first partition plate, the second partition plate and the corresponding surrounding plate portion.

[0027] Furthermore, in order to facilitate noise reduction for different frequency bands, the first noise reduction holes are arranged in an array along the direction from the second end to the first end of the corresponding smoke guide plate body, and the opening ratios of the first noise reduction holes in adjacent rows are not equal.

[0028] Furthermore, a first reflector is provided on the inner side of the second end of the first smoke guide plate, and a second reflector is provided on the inner side of the second end of the second smoke guide plate. Both the first and second reflectors are located in the first noise reduction cavity and are rotatably connected to the corresponding smoke guide plate body. The rotation axes of the first and second reflectors extend in the front-back direction, thereby reflecting noise.

[0029] Furthermore, to improve the noise reduction effect, the first end of the first outer plate is provided with a first flange extending to the first noise reduction plate, and the first end of the second outer plate is provided with a second flange extending to the second noise reduction plate.

[0030] In the open state, noise reduction cavities are formed in the space between the first outer plate, the first inner plate, the first flange, the first noise reduction plate and the corresponding first enclosure plate, as well as in the space between the second outer plate, the second inner plate, the second flange, the second noise reduction plate and the corresponding second enclosure plate.

[0031] Furthermore, to enhance the noise reduction effect, second noise reduction holes are provided on both the first inner plate and the second inner plate;

[0032] The first noise reduction plate is attached to the first inner plate. A third partition plate is provided at the end of the first noise reduction plate located between the first outer plate and the second inner plate. The third partition plate extends from the end of the first noise reduction plate toward the first outer plate and abuts against the first outer plate. The second noise reduction plate is attached to the second inner plate. A fourth partition plate is provided at the end of the second noise reduction plate located between the second outer plate and the second inner plate. The fourth partition plate extends from the end of the second noise reduction plate toward the second outer plate and abuts against the second outer plate.

[0033] The space between the first outer plate, the first flange, the first noise reduction plate, the third cavity plate, and the corresponding first enclosure plate constitutes the second noise reduction cavity. The space between the first outer plate, the first inner plate, the third cavity plate, and the corresponding first enclosure plate constitutes the third noise reduction cavity. The second noise reduction cavity and the third noise reduction cavity are separated by the third cavity plate. The space between the second outer plate, the second flange, the second noise reduction plate, the fourth cavity plate, and the corresponding second enclosure plate constitutes the fourth noise reduction cavity. The space between the second outer plate, the second inner plate, the fourth cavity plate, and the corresponding second enclosure plate constitutes the fifth noise reduction cavity. The fourth noise reduction cavity and the fifth noise reduction cavity are separated by the fourth cavity plate.

[0034] Furthermore, in order to facilitate noise reduction for different frequency bands, the second noise reduction holes are arranged in an array along the direction from the second end to the first end of the corresponding smoke guide plate body, and the opening ratios of adjacent rows of the second noise reduction holes are not equal.

[0035] The technical solution adopted by the present invention to solve the second technical problem mentioned above is as follows: in the open state, the first noise reduction plate and the second noise reduction plate can rise and fall relative to the corresponding smoke guide plate.

[0036] Furthermore, in order to facilitate the lifting and lowering of each noise reduction plate while avoiding interference with the movement of the smoke guide plate, the range hood also includes a motion mechanism for driving the first noise reduction plate and the second noise reduction plate to lift and lower when in the open state. The motion mechanism includes a linear drive module, and the output end of the linear drive module is provided with a first protrusion and a second protrusion.

[0037] The first noise reduction plate has a first guide component at the end outside the first smoke guide plate body, and the second noise reduction plate has a second guide component at the end outside the second smoke guide plate body. The first guide component has an arc-shaped first guide groove, and the second guide component has an arc-shaped second guide groove. The first protrusion cooperates with the first guide groove, and the second protrusion cooperates with the second guide groove.

[0038] The technical solution adopted by the present invention to solve the above-mentioned third technical problem is as follows: the first end of the first outer plate is provided with a first flange extending to the first noise reduction plate, and the first end of the second outer plate is provided with a second flange extending to the second noise reduction plate; a second noise reduction hole is provided on both the first inner plate and the second inner plate;

[0039] The first noise reduction plate has a first blind hole on the side facing the first flange, and the second noise reduction plate has a second blind hole on the side facing the second flange;

[0040] In the off state, the first noise reduction board and the second noise reduction board have at least a first state and a second state:

[0041] In the first state, the first blind hole is located on the outside of the first smoke guide plate body, and the second blind hole is located on the outside of the second smoke guide plate body;

[0042] Second state: The first blind hole is opposite to the first flange, and the second blind hole is opposite to the second flange.

[0043] Furthermore, in order to facilitate the isolation of the inside and outside of the range hood when it is closed, and to facilitate more thorough cleaning of the noise reduction holes, in the first state, the first noise reduction holes of the first noise reduction plate and the second noise reduction plate are respectively misaligned with the second noise reduction holes of the corresponding inner plate; in the second state, the first noise reduction holes of the first noise reduction plate and the second noise reduction plate coincide with the second noise reduction holes of the corresponding inner plate.

[0044] To further obtain high-temperature steam, a first heating chamber is formed inside the first outer plate, and a first heating module is provided inside the first heating chamber. A second heating chamber is formed inside the second outer plate, and a second heating module is provided inside the second heating chamber.

[0045] To prevent steam from escaping during steaming and cooking, a gap exists between the second ends of the first and second smoke guide plates when the plates are open.

[0046] At the second end of the first smoke guide plate, a first reflector plate is provided on the side of the first enclosure plate facing inward of the first smoke guide plate. At the second end of the second smoke guide plate, a second reflector plate is provided on the side of the second enclosure plate facing inward of the second smoke guide plate. The first reflector plate and the second reflector plate are rotatably connected to the corresponding smoke guide plate body. The rotation axes of the first reflector plate and the second reflector plate extend in the front-back direction.

[0047] Furthermore, the first smoke guide plate includes a first heating module, and the second smoke guide plate includes a second heating module, thereby reducing the condensation of oil on the smoke guide plate.

[0048] Compared with the prior art, the advantages of the present invention are as follows:

[0049] 1) By setting two smoke guide plates, the corresponding air inlets are closed in the closed state, while in the open state, the first ends of each of the two smoke guide plates are constrained in the smoke collection hood, while the second ends of each extend downwards into the rising path of the oil fumes, so that the oil fumes are deflected and flow towards the middle smoke guide plate. The two smoke guide plates play the role of adhering to the wall and guiding the flow, thereby reducing the diffusion of oil fumes and improving the smoke extraction effect.

[0050] 2) By raising and lowering the noise reduction plate with uneven opening ratio when it is open, the noise can be adjusted to the corresponding noise reduction frequency band under different operating conditions of the range hood, thereby reducing noise and improving the cooking experience, thus realizing a multi-frequency noise reduction solution;

[0051] 3) Use the high-temperature steam generated during steam cooking to clean the noise reduction holes, reducing the risk of the noise reduction holes of the noise reduction device being blocked. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the closed state of the range hood according to the first embodiment of the present invention;

[0053] Figure 2 This is a cross-sectional view of the range hood in the closed state according to the first embodiment of the present invention;

[0054] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0055] Figure 4 for Figure 3 A schematic diagram showing the middle reflector after rotation;

[0056] Figure 5 This is a schematic diagram (closed state) of the smoke guide plates, noise reduction plates and their motion mechanisms of the range hood according to the first embodiment of the present invention;

[0057] Figure 6 This is a schematic diagram (closed state) of the smoke guide plates and their movement mechanism of the range hood according to the first embodiment of the present invention;

[0058] Figure 7 This is a cross-sectional view of the range hood of the first embodiment of the present invention in an intermediate state from the closed state to the open state;

[0059] Figure 8 This is a schematic diagram of the range hood in the open state according to the first embodiment of the present invention;

[0060] Figure 9 This is a cross-sectional view of the range hood in the open state according to the first embodiment of the present invention;

[0061] Figure 10 This is a schematic diagram (open state) of the smoke guide plates, noise reduction plates and their motion mechanism of the range hood according to the first embodiment of the present invention;

[0062] Figure 11 This is a partial cross-sectional view (open state) of the smoke guide plates and noise reduction plates of the range hood according to the first embodiment of the present invention;

[0063] Figure 12 This is a partial cross-sectional view of the second smoke guide plate of the range hood according to the second embodiment of the present invention;

[0064] Figure 13 This is a partial cross-sectional view of the second smoke guide plate of the range hood according to the second embodiment of the present invention;

[0065] Figure 14 This is a cross-sectional view (closed state) of the smoke guide plates, noise reduction plates, and their moving mechanisms of the range hood according to the second embodiment of the present invention. Detailed Implementation

[0066] 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.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and 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 invention 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.

[0068] Example 1

[0069] See Figure 1 , Figure 2 , Figures 7-9A range hood, specifically a top-mounted range hood, includes a smoke collection hood 1, a fan frame 2 mounted on the smoke collection hood 1, and a fan 3 disposed within the fan frame 2. Preferably, the fan 3 is a centrifugal fan and a dual-inlet fan, with its axis extending in the left-right direction, thereby oriented its two air inlets towards the left and right sides respectively. The fan 3 can be positioned in the middle within the fan frame 2.

[0070] The fume hood 1 has a first air inlet 11 and a second air inlet 12 arranged horizontally, with the first air inlet 11 located to the left of the second air inlet 12. The fume hood 1 can be flat (with a small thickness in the vertical direction), and more preferably, it is flat. Thus, the fumes drawn in through each air inlet directly enter the fan frame 2, unlike common range hoods where the fumes accumulate inside the fume hood 1 before entering the fan frame 2. The range hood also includes a first smoke guide plate 41 for opening and closing the first air inlet 11 and a second smoke guide plate 42 for opening and closing the second air inlet 12.

[0071] The first smoke guide plate 41 includes a first smoke guide plate body 411 and a first surrounding plate 412 surrounding the outer periphery of the first smoke guide plate body 411. The second smoke guide plate 42 includes a second smoke guide plate body 421 and a second surrounding plate 422 surrounding the outer periphery of the second smoke guide plate body 421. Each surrounding plate is flat. The first surrounding plate 412 has at least three surrounding plates respectively surrounding the front and rear sides and the left edge of the first smoke guide plate body 411 (except for the first end, which can be defined below), making the first smoke guide plate 41 a hollow cover. The second surrounding plate 422 has at least three surrounding plates respectively surrounding the front and rear sides and the right edge of the second smoke guide plate body 421 (except for the first end, which can be defined below), making the second smoke guide plate 42 a hollow cover. Preferably, the first smoke guide plate 41 and the second smoke guide plate 42 are both integral structures.

[0072] The first smoke guide plate 41 and the second smoke guide plate 42 can be in at least two states: a closed state and an open state. In the closed state, the first smoke guide plate 41 and the second smoke guide plate 42 are at their maximum relative angle of extension. The first smoke guide plate 41 closes the first air inlet 11, with the body of the first smoke guide plate 411 flush with the bottom of the first air inlet 11. The first enclosure plate 412 extends below the first air inlet 11, so that the first smoke guide plate 41 has an opening on the side facing outwards from the fan frame 2, presenting an upward concave shape. The second smoke guide plate 42 closes the second air inlet 12, with the body of the second smoke guide plate 421 flush with the bottom of the second air inlet 12. The second enclosure plate 422 extends below the second air inlet 12, so that the second smoke guide plate 42 has an opening on the side facing outwards from the fan frame 2, presenting an upward concave shape. This closed state prevents odors from entering the kitchen. Preferably, each smoke guide plate can engage with the smoke collection hood 1. The engagement method can be a common snap-fit ​​connection, etc., and the engagement structure is not shown in the figure. The ends of the first smoke guide plate 41 and the second smoke guide plate 42 that are close to each other are considered their respective first ends, and the ends that are far apart are considered their respective second ends. Preferably, the first ends of the first smoke guide plate 41 and the second smoke guide plate 42 are directly rotatably connected to the smoke collection hood 1 via a pivot 45. In the closed state, the first enclosure plate 412 extends downward from the outer peripheral edge of the first smoke guide plate body 411, and the second enclosure plate 422 extends downward from the outer peripheral edge of the second smoke guide plate body 421. There is a certain gap between the first ends of the first smoke guide plate 41 and the second smoke guide plate 42, and the closing method is described below.

[0073] The range hood also includes a motion mechanism for driving the two smoke guide plates to rotate, including a first drive mechanism 61 and a first transmission mechanism. In this embodiment, the first transmission mechanism includes a driving gear 621 and a driven gear 622. The first drive mechanism 61 is a rotation drive module, preferably a motor. The driving gear 621 is mounted on one of the rotating shafts 45, and the driven gear 622 is mounted on the other rotating shaft 45. The first drive mechanism 61 drives the driving gear 621 (which drives the driving gear 621 on the rotating shaft 45 through a transmission connection with the rotating shaft 45) to rotate, thereby driving the driven gear 622 to rotate, so that the two smoke guide plates rotate synchronously. Since the first drive mechanism 61 and the first transmission mechanism are exposed to the oil fume environment, a housing 63 can be provided outside the first drive mechanism 61 and the first transmission mechanism to avoid oil fume pollution.

[0074] See Figures 2-9 When it needs to be opened, the motion mechanism drives the two smoke guide plates to flip downwards. Figure 7The middle arrow indicates the direction of movement of the smoke guide plates. The first ends of each of the two smoke guide plates are constrained within the smoke collection hood 1, while the second ends of each extend downwards into the path of the rising fumes, serving as a guide for the flow of the fumes. The two smoke guide plates are closed together to form a semi-enclosed space. The tops of the two smoke guide plates are not enclosed, and the smoke guide plate bodies of each of the two smoke guide plates constitute a flow guide plate. Figure 9 The middle arrow indicates the path of the cooking fumes.

[0075] The first smoke guide plate 41 and the second smoke guide plate 42 preferably have the same structure and are symmetrically arranged. The first smoke guide plate body 411 includes a first outer plate 4111 and a first inner plate 4112. Similarly, the second smoke guide plate body 421 includes a second outer plate 4211 and a second inner plate 4212. The first surrounding plate 412 surrounds the periphery of the first outer plate 4111, and the first inner plate 4112 is disposed within the space enclosed by the first outer plate 4111 and the first surrounding plate 412. Preferably, the first inner plate 4112 is parallel to the first outer plate 4111.

[0076] In the closed state, the first inner plate 4112 is located below the first outer plate 4111, and the second inner plate 4212 is located below the second outer plate 4211. In the open state, the second ends of the first smoke guide plate 41 and the second smoke guide plate 42 rotate downwards until they are closed. At this time, most of the first smoke guide plate 41 and the second smoke guide plate 42 are located below the smoke collection hood 1, with the first inner plate 4112 and the second inner plate 4212 facing each other, while the first outer plate 4111 and the second outer plate 4211 are located on the side in contact with the fumes. Because they are located on the rising path of the fumes, each outer plate can play a role in adhering to the wall and guiding the flow. Under the effect of the wall adhesion of each outer plate, the fumes are deflected towards the center, and then the fumes deflected towards the center enter the negative pressure zone of each air inlet, thereby reducing escape and improving the smoke extraction effect.

[0077] At the second end of the first smoke guide plate 41, the first inner plate 4112 and the corresponding first surrounding plate 412 away from the first outer plate 4111 can be closed by the first connecting plate 4113. At the first end of the second smoke guide plate 42, the second inner plate 4212 and the corresponding second surrounding plate 422 away from the second outer plate 4211 can be closed by the second connecting plate 4213.

[0078] A first reflector 413 is disposed on the side of the first connecting plate 41 facing inwards from the first smoke guide plate 41, and a second reflector 423 is disposed on the side of the second connecting plate 4213 facing inwards from the second smoke guide plate 42. The first reflector 413 can be rotatably connected to the transition position between the first connecting plate 4113 and the first inner plate 4112 (or either the first connecting plate 4113 or the first inner plate 4112). The second reflector 423 can be rotatably connected to the transition position between the second connecting plate 4213 and the second inner plate 4212 (or either the second connecting plate 4213 or the second inner plate 4212). The rotation axis of each reflector extends in the front-back direction. The upper end of each reflector is rotatably connected to the corresponding smoke guide plate body, and the lower end of each reflector is a free end.

[0079] See Figure 2 , Figure 3 , Figures 9-11 The range hood also includes a noise reduction device, which includes a first noise reduction plate 51 and a second noise reduction plate 52. The first noise reduction plate 51 is at least partially located between the first outer plate 4111 and the first inner plate 4112, and the second noise reduction plate 52 is at least partially located between the second outer plate 4211 and the second inner plate 4212. At this time, the first end of the first outer plate 4111 (the first end of the first smoke guide plate 41, i.e., the first end of the first outer plate 4111) is provided with a first flange 4114 extending to the first noise reduction plate 51, and the first end of the second outer plate 4211 (the first end of the second smoke guide plate 42, i.e., the first end of the second outer plate 4211) is provided with a second flange 4214 extending to the second noise reduction plate 52.

[0080] The first inner plate 4112 and the second inner plate 4212 also constitute noise reduction plates. Preferably, each of these noise reduction plates has a first noise reduction hole 53 on a flat plate and a second noise reduction hole 4115 on each inner plate. In the closed state, the first noise reduction hole 53 and the second noise reduction hole 4115 are staggered, thereby isolating the interior of the range hood from the external environment and preventing backflow of smoke and odors.

[0081] The first noise reduction hole 53 and the second noise reduction hole 4115 are arranged in an array. The opening ratio of the second noise reduction hole 4115 decreases from the second end to the first end of the corresponding smoke guide plate body, while the opening ratio of the first noise reduction hole 53 is the opposite.

[0082] The first noise reduction plate 51 can be tightly attached to the first inner plate 4112. A third partition plate 511 is provided at the end of the first noise reduction plate 51 located between the first outer plate 4111 and the second inner plate 4212. The third partition plate 511 extends from the end of the first noise reduction plate 51 toward the first outer plate 4111 and abuts against the first outer plate 4111. The second noise reduction plate 52 can be tightly attached to the second inner plate 4212. A fourth partition plate 521 is provided at the end of the second noise reduction plate 52 located between the second outer plate 4211 and the second inner plate 4212. The fourth partition plate 521 extends from the end of the second noise reduction plate 52 toward the second outer plate 4211 and abuts against the second outer plate 4211.

[0083] On the first noise reduction plate 51, a first baffle plate 512 is provided near the end of the first noise reduction plate 51 located outside the first smoke guide plate body 411 (the end corresponding to the first end of the first smoke guide plate 41). The first baffle plate 512 can be perpendicular to the first noise reduction plate 51. On the second noise reduction plate 52, a second baffle plate 522 is provided near the end of the second noise reduction plate 52 located outside the second smoke guide plate body 421 (the end corresponding to the first end of the second smoke guide plate body 421). The second baffle plate 522 can be perpendicular to the second noise reduction plate 52. In the closed state, the first noise reduction plate 51 and the second noise reduction plate 52 are exposed at the ends of their respective smoke guide plate bodies and abut against each other, thereby sealing the gap between the two smoke guide plate bodies. The first baffle plate 512 and the second baffle plate 522 extend downward from the ends of their respective noise reduction plates. In the open state, the ends of the first baffle plate 512 and the second baffle plate 522 away from their respective noise reduction plates abut against each other.

[0084] Therefore, in the open state, the space between the first noise reduction plate 51, the second noise reduction plate 52, the first inner plate 4112, the second inner plate 4212, the first partition plate 512, the second partition plate 522, the first connecting plate 4113, the second connecting plate 4213 and the corresponding surrounding plate portion constitutes the first noise reduction cavity Q1. The space between the first outer plate 4111, the first flange 4114, the first noise reduction plate 51, the third partition plate 511 and the corresponding first surrounding plate 412 portion constitutes the second noise reduction cavity Q2. The space between the first outer plate 4111, the first inner plate 4112, the third partition plate 511 and the corresponding first surrounding plate 412 portion constitutes the third noise reduction cavity Q3. The second noise reduction cavity Q2 and the third noise reduction cavity Q3 are separated by the third partition plate 511. The space between the second outer plate 4211, the second flange 4214, the second noise reduction plate 52, the fourth partition plate 521 and the corresponding second enclosure plate 422 constitutes the fourth noise reduction cavity Q4. The space between the second outer plate 4211, the second inner plate 4212, the fourth partition plate 521 and the corresponding second enclosure plate 422 constitutes the fifth noise reduction cavity Q5. The fourth noise reduction cavity Q4 and the fifth noise reduction cavity Q5 are separated by the fourth partition plate 521.

[0085] The motion mechanism also includes a second drive mechanism 54 and a second transmission mechanism for driving the movement of the first noise reduction plate 51 and the second noise reduction plate 52. The second drive mechanism 54 is preferably a motor, which is installed inside the fan frame 2. The second transmission mechanism includes a lead screw 651 and a slider 652 threaded onto the lead screw 651. Thus, the second drive mechanism 54 and the second transmission mechanism constitute a linear drive, and the slider 652 is the output end of this linear drive module. The lower end of the lead screw 651 is rotatably supported within the housing 63. The slider 652 is provided with a first protrusion 6531 and a second protrusion 6532. The end of the first noise reduction plate 51 located outside the first smoke guide plate body 411 is provided with a first guide component 513, and the end of the second noise reduction plate 52 located outside the second smoke guide plate 42 is provided with a second guide component 523. The first guide component 513 and the first partition plate 512 are respectively located on opposite sides of the first noise reduction plate 51, and the second guide component 523 and the second partition plate 522 are respectively located on opposite sides of the second noise reduction plate 52. The first guide component 513 has an arc-shaped first guide groove 5131, and the second guide component 523 has an arc-shaped second guide groove 5231. The first protrusion 6531 engages with the first guide groove 5131, and the second protrusion 6532 engages with the second guide groove 5231. In the closed state, the first guide component 513 and the second guide component 523 are close to each other, and each guide groove protrudes towards the other guide groove. In the open state, the first guide component 513 and the second guide component 523 are separated from each other by the first noise reduction plate 51 and the second noise reduction plate 52. At this time, the first protrusion 6531 can be located near the top of the first noise reduction plate 51 in the first guide groove 5131, and the second protrusion 6532 can be located near the top of the second noise reduction plate 52 in the second guide groove 5231. The direction of movement of each noise reduction plate is the same as the axis of the lead screw 651. At this time, the slider 652 can drive each noise reduction plate to move up and down.

[0086] Therefore, the range hood of this invention can achieve multi-band noise reduction. Based on the Helmholtz resonance silencing principle, the air column inside the small hole (the noise-reducing hole mentioned above) and the air inside the cavity (the noise-reducing cavity mentioned above) constitute an elastic resonance system. When some noise frequencies of the range hood are the same as the natural frequency of this resonance system, the air column in the small hole resonates and undergoes intense friction with the hole wall. This friction converts sound energy into heat energy, thereby achieving noise reduction. Based on this principle, the resonant frequency of each independent resonant cavity can be obtained as follows: In the formula, c is the speed of sound, S is the area of ​​the corresponding aperture, V is the volume of the cavity, and L is the effective diameter of the aperture. Based on the resonant frequency formula of the independent resonant cavity, the resonant frequency of the parallel resonant cavity can be derived as follows: In the formula, c is the speed of sound, P is the perforation ratio, and D is the effective depth of the cavity. From this formula, it can be seen that when the effective depth of the cavity remains constant, the resonant frequency of the sound absorption peak can be controlled by adjusting the perforation ratio P.

[0087] See Figure 11 Therefore, in this embodiment, first noise reduction holes 53 are formed on the first noise reduction plate 51 and the second noise reduction plate 52. In this state, the perforation rate of the first noise reduction holes 53 in two adjacent rows is not equal, and the perforation rate gradually decreases from top to bottom. Thus, when the first noise reduction plate 51 and the second noise reduction plate 52 rise, the first noise reduction holes 53 set on the noise reduction plates are exposed row by row. Since the perforation rate gradually decreases while the depth of the first noise reduction cavity Q1 (the distance between the first noise reduction plate 51 and the second noise reduction plate 52) remains unchanged, the resonant frequency f gradually decreases as the two noise reduction plates rise.

[0088] Some noise enters the first noise reduction cavity Q1 through the first noise reduction holes 53 of the two noise reduction plates or the two noise reduction plates. Similarly, the second noise reduction holes 4115 are also arranged in an array. In the open state, the perforation rates of the second noise reduction holes 4115 in adjacent rows are not equal, and the perforation rate gradually increases from top to bottom. Therefore, as the third cavity plate 511 and the fourth cavity plate 521 rise, the perforation rate of the second / fourth noise reduction cavity gradually decreases, and the perforation rates of the third and fifth noise reduction cavities also gradually decrease. These second / third / fourth / fifth noise reduction cavities can further reduce the noise entering the first noise reduction cavity Q1.

[0089] In summary, the resonant frequency of each noise reduction cavity changes with the position of the corresponding noise reduction plate. The noise reduction structure of this invention has three noise reduction processes. The first process involves the first noise reduction hole 53 of each noise reduction plate being completely located inside the corresponding smoke guide plate. As each noise reduction plate rises, the first noise reduction hole 53 of each noise reduction plate and the second noise reduction hole 4115 of the corresponding smoke guide plate gradually overlap, i.e., the area of ​​the effective noise reduction hole changes from small to large. This process changes the resonant frequency of the second noise reduction cavity Q2 and the fourth noise reduction cavity Q4, achieving noise reduction under this frequency range. The second process involves the first noise reduction hole 53 of each noise reduction plate beginning to extend beyond the corresponding smoke guide plate. At this time, the first noise reduction cavity Q1 begins to function. As each noise reduction plate rises, the perforation rate of the first / second / fourth noise reduction cavities changes, i.e., this process changes the resonant frequency of the first / second / fourth noise reduction cavities, simultaneously achieving noise reduction under these three frequency ranges. The third process involves the following steps: as the noise reduction plates continue to rise, the corresponding partition plates located at the ends of each noise reduction plate rise and cross the second noise reduction holes 4115 of each inner plate. At this point, the third / fifth noise reduction cavity begins to function. As the position of each noise reduction plate changes, the perforation rate of the first to fifth noise reduction cavities changes, thus achieving noise reduction under these five frequency band operating conditions.

[0090] Therefore, noise reduction is achieved by adjusting the resonant frequency of the noise reduction cavity based on the noise frequency generated by the fan speed under different operating conditions or at different speed settings of the range hood. This can be achieved by setting the position of the noise reduction plate at different speed settings at the factory, or by incorporating a sound frequency sensor and adjusting the position of the noise reduction plate through data processing. Alternatively, the perforated filter of each noise reduction hole can be gradually increased from top to bottom, or increased first and then decreased.

[0091] Furthermore, during the aforementioned noise reduction process, some noise enters the first noise reduction cavity Q1 through the noise reduction plate or the first noise reduction hole 53 of the noise reduction plate, and is reflected within the first noise reduction cavity Q1. By adjusting the angles of the first reflector 413 and the second reflector 423, some noise can be reflected back to the corresponding noise reduction cavity area. For example, see... Figure 11 As shown, by adjusting the second reflector 423, some noise can be reflected to the second noise reduction cavity Q2 or the third noise reduction cavity Q3, and a better noise reduction effect can be obtained according to the resonant frequency of different noise reduction cavities.

[0092] Example 2

[0093] See Figures 12-14 In this embodiment, the difference from the first embodiment is that the first outer plate 4111 is a hollow plate forming a first heating cavity 414, and the second outer plate 4211 is also a hollow plate forming a second heating cavity 424. A first heating module 415, such as a heating wire, can be provided in the first heating cavity 414, and a second heating module 425, such as a heating wire, can be provided in the second heating cavity 424.

[0094] Combination Figure 10 and Figure 11 The first noise reduction plate 51 has a first blind hole 514 on the side facing the first flange 4114, and the second noise reduction plate 52 has a second blind hole 524 on the side facing the second flange 4214. In the closed state, the first noise reduction plate 51 and the second noise reduction plate 52 are in the first state, with the first blind hole 514 located outside the first smoke guide plate body 411 and the second blind hole 524 located outside the second smoke guide plate body 421.

[0095] When steam cooking or boiling water to steam rice, a large amount of high-temperature steam is generated. At this time, all smoke guide plates are in the closed state, and the slider 652 is in its initial position. See also Figure 14As the drive slider 652 continues to move downward from its initial position (as indicated by arrow A), the first noise reduction plate 51 moves to the left (as indicated by arrow B) until the center of the second noise reduction hole 4115 on the first inner plate 4112 coincides with the center of the first noise reduction hole 53 on the first noise reduction plate 51, and the first blind hole 514 is opposite to the first flange 4114; the second noise reduction plate 52 moves to the right (as indicated by arrow C) until the center of the second noise reduction hole 4115 on the second inner plate 4212 coincides with the center of the first noise reduction hole 53 on the second noise reduction plate 52, and the second blind hole 524 is opposite to the second flange 4214. Thus, the first blind hole 514 connects the interior of the first smoke guide plate body 411 with the interior of the range hood, and the second blind hole 524 connects the interior of the second smoke guide plate body 421 with the interior of the range hood. This is the second state of the first noise reduction plate 51 and the second noise reduction plate 52 in the closed state.

[0096] At this point, fan 3 is activated, and high-temperature steam is drawn in through the noise reduction holes, with some flowing upwards through the gap between the two noise reduction plates, as shown by arrow D. The heating modules are then activated, further heating the high-temperature steam inside the smoke guide plates (since the steam during cooking is already high-temperature, only a small amount of energy is needed for further heating to obtain high-temperature steam), thus improving the cleaning effect of the noise reduction plates. This cleans away the small amount of oil residue adhering to the surface of the noise reduction holes. Furthermore, the flow rate can be controlled by adjusting the overlap of the noise reduction holes; a lower overlap results in a faster wind speed and better rinsing ability, while a higher overlap results in lower resistance and a larger flow rate.

[0097] With a fixed air volume, each smoke guide plate is concave to capture more water vapor, thus preventing water vapor from spreading outward and spreading rapidly. In addition, each reflector can also adjust the angle of water vapor blocking to improve the water vapor blocking effect.

[0098] Furthermore, the noise reduction holes of this invention can also avoid being clogged by oil stains. When a range hood is working, the formation of oil stains usually involves two processes. The first process is that small particles of oil fumes generated during cooking are drawn into the range hood by the fan after being heated to high temperatures. These high-temperature small particles of oil fumes are condensed and adhere to the surface of the cooler components inside the range hood. The second process is that after cooking, as the inner cavity of the range hood gradually cools down, the oil stains in the air inside the cavity are further condensed and adsorbed onto the surface of the components, and the condensed oil stains on the surface of the components gradually accumulate to form large oil droplets.

[0099] In this invention, during the cooking process (open state) in the first process, each outer panel isolates the oil fumes generated during cooking from the outside. That is, the second noise reduction holes 4115 on each inner panel do not directly contact the oil fumes. Although each noise reduction plate extends out of the smoke guide plate body, the heating module generates high temperature in each noise reduction cavity. Under the action of heat conduction and hot air rising, the two noise reduction plates are in a high temperature state. Therefore, the small particulate oil fumes generated during cooking will not condense on the noise reduction plates in a high temperature state. During operation, range hoods have a large airflow, which carries away a significant amount of heat, resulting in energy waste. This invention significantly reduces heat loss by heating inside a noise-reducing cavity, which is isolated from the range hood's air duct. Furthermore, the noise-reducing plate overlaps with the heater, resulting in good heating effect and minimal heat loss. Another part is located directly above the heating module. While some heat in the noise-reducing cavity is lost due to heat rising and airflow, this lost heat must pass through the noise-reducing plate or its noise-reducing holes during the rising process. In other words, this heat can be absorbed by the noise-reducing plate located directly above the heating module, meaning the noise-reducing plate can recover and reuse some of the heat energy.

[0100] During the non-cooking period (open state) of the second process, the first noise reduction holes 53 of the two noise reduction plates are located inside the corresponding smoke guide plates, completely isolated from the oil stains inside the range hood. That is, large oil droplets that have condensed on other parts will not flow into the noise reduction plates. In addition, the two smoke guide plates close the range hood in the non-cooking state. At this time, the second noise reduction holes 4115 of each inner plate are located on the outer surface of the range hood, which are also completely isolated from the oil stains inside the range hood.

[0101] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood comprising a hood (1) having a first air inlet (11) and a second air inlet (12) arranged left and right on the hood (1); The range hood further comprises a first smoke guide plate (41) and a second smoke guide plate (42); characterized in that: The first smoke guide plate (41) comprises a first smoke guide plate body (411) and a first surrounding plate (412) surrounding the periphery of the first smoke guide plate body (411), and the second smoke guide plate (42) comprises a second smoke guide plate body (421) and a second surrounding plate (422) surrounding the periphery of the second smoke guide plate body (421); The first smoke guide plate (41) and the second smoke guide plate (42) can at least be in the following two states: A closed state, the first smoke guide plate (41) closes the first air inlet (11), the second smoke guide plate (42) closes the second air inlet (12), the first smoke guide plate (41) and the second smoke guide plate (42) are concave upward, at this time the end of the two smoke guide plates close to each other is the first end of each smoke guide plate, and the end of the two smoke guide plates away from each other is the second end of each smoke guide plate, and the first end is constrained in the hood (1); An open state, the first smoke guide plate (41) and the second smoke guide plate (42) are folded to open the first air inlet (11) and the second air inlet (12), and the first smoke guide plate (41) and the second smoke guide plate (42) are at least partially located below the hood (1), and the second end is located below the hood (1).

2. The hood according to claim 1, characterized in that: The first surrounding plate (412) surrounds the edge of the first smoke guide plate body (411) except the first end, and the second surrounding plate (422) surrounds the edge of the second smoke guide plate body (421) except the first end.

3. The hood according to claim 1, characterized in that: The range hood further comprises a first noise reduction plate (51) and a second noise reduction plate (52), the first noise reduction plate (51) is at least partially located in the first smoke guide plate (41), and the second noise reduction plate (52) is at least partially located in the second smoke guide plate (42).

4. The hood according to claim 3, characterized in that: The first smoke guide plate (41) comprises a first smoke guide plate body (411) and a first surrounding plate (412) surrounding the periphery of the first smoke guide plate body (411), and the second smoke guide plate (42) comprises a second smoke guide plate body (421) and a second surrounding plate (422) surrounding the periphery of the second smoke guide plate body (421), the first surrounding plate (412) surrounds the edge of the first smoke guide plate body (411) except the first end, and the second surrounding plate (422) surrounds the edge of the second smoke guide plate (42) except the first end; The first smoke guide plate body (411) comprises a first outer plate (4111) and a first inner plate (4112), and the second smoke guide plate body (421) comprises a second outer plate (4211) and a second inner plate (4212), in the closed state, the first inner plate (4112) is located below the first outer plate (4111), and the second inner plate (4212) is located below the second outer plate (4211); The first noise reduction plate (51) is located at least partially between the first outer plate (4111) and the first inner plate (4112), the second noise reduction plate (52) is located at least partially between the second outer plate (4211) and the second inner plate (4212), and the first noise reduction plate (51) and the second noise reduction plate (52) are both provided with first noise reduction holes (53).

5. The hood according to claim 4, characterized in that: The first noise reduction plate (51) is located at least partially between the first outer plate (4111) and the first inner plate (4112), the second noise reduction plate (52) is located at least partially between the second outer plate (4211) and the second inner plate (4212), and the first noise reduction plate (51) and the second noise reduction plate (52) are both provided with first noise reduction holes (53). In the open state, the first cavity partition plate (512) and the second cavity partition plate (522) are located away from the end of the corresponding noise reduction plate, and thus the space between the first noise reduction plate (51), the second noise reduction plate (52), the first inner plate (4112), the second inner plate (4212), the first cavity partition plate (512), the second cavity partition plate (522) and the corresponding baffle part forms a first noise reduction cavity (Q1).

6. The hood according to claim 5, characterized in that: The first noise reduction holes (53) are arranged in an array, and the opening rates of the first noise reduction holes (53) in adjacent rows are different along the direction from the second end to the first end of the corresponding smoke guide plate body.

7. The hood according to claim 5, characterized in that: The second end of the first smoke guide plate (41) is provided with a first reflection plate (413), and the second end of the second smoke guide plate (42) is provided with a second reflection plate (423). The first reflection plate (413) and the second reflection plate (423) are located in the first noise reduction cavity (Q1) and are rotationally connected with the corresponding smoke guide plate body. The rotation axes of the first reflection plate (413) and the second reflection plate (423) extend in the front-rear direction.

8. The hood according to claim 5, characterized in that: The first end of the first outer plate (4111) is provided with a first flange (4114) extending to the first noise reduction plate (51), and the first end of the second outer plate (4211) is provided with a second flange (4214) extending to the second noise reduction plate (52). In the open state, the space between the first outer plate (4111), the first inner plate (4112), the first flange (4114), the first noise reduction plate (51) and the corresponding first baffle (412) part, and the space between the second outer plate (4211), the second inner plate (4212), the second flange (4214), the second noise reduction plate (52) and the corresponding second baffle (422) form a noise reduction cavity.

9. The hood according to claim 8, characterized in that: The first inner plate (4112) and the second inner plate (4212) are both provided with second noise reduction holes (4115). The first noise reduction plate (51) is tightly attached to the first inner plate (4112), and the end of the first noise reduction plate (51) between the first outer plate (4111) and the second inner plate (4212) is provided with a third cavity partition plate (511), the third cavity partition plate (511) extends from the end of the first noise reduction plate (51) to the first outer plate (4111) and abuts against the first outer plate (4111); the second noise reduction plate (52) is tightly attached to the second inner plate (4212), and the end of the second noise reduction plate (52) between the second outer plate (4211) and the second inner plate (4212) is provided with a fourth cavity partition plate (521), the fourth cavity partition plate (521) extends from the end of the second noise reduction plate (52) to the second outer plate (4211) and abuts against the second outer plate (4211); The space between the first outer plate (4111), the first flange (4114), the first noise reduction plate (51), the third cavity partition plate (511) and the corresponding first baffle (412) part constitutes a second noise reduction cavity (Q2), the space between the first outer plate (4111), the first inner plate (4112), the third cavity partition plate (511) and the corresponding first baffle (412) part constitutes a third noise reduction cavity (Q3), the second noise reduction cavity (Q2) and the third noise reduction cavity (Q3) are separated by the third cavity partition plate (511), the space between the second outer plate (4211), the second flange (4214), the second noise reduction plate (52), the fourth cavity partition plate (521) and the corresponding second baffle (422) part constitutes a fourth noise reduction cavity (Q4), the space between the second outer plate (4211), the second inner plate (4212), the fourth cavity partition plate (521) and the corresponding second baffle (422) part constitutes a fifth noise reduction cavity (Q5), the fourth noise reduction cavity (Q4) and the fifth noise reduction cavity (Q5) are separated by the fourth cavity partition plate (521).

10. The hood according to claim 9, characterized in that: The second noise reduction holes (4115) are arranged in an array, and the opening rates of the second noise reduction holes (4115) in two adjacent rows are not equal in the direction from the second end to the first end of the corresponding smoke guide plate body.

11. The hood according to claim 6 or 10, characterized in that: In the open state, the first noise reduction plate (51) and the second noise reduction plate (52) can be lifted relative to the corresponding smoke guide plate.

12. The hood according to claim 11, characterized in that: The range hood further comprises a movement mechanism for driving the first noise reduction plate (51) and the second noise reduction plate (52) to lift in the open state, the movement mechanism comprising a linear drive module, and the output end of the linear drive module is provided with a first protrusion (6531) and a second protrusion (6532); The first guiding component (513) is provided with an arc-shaped first guiding groove (5131), and the second guiding component (523) is provided with an arc-shaped second guiding groove (5231).

13. The hood according to claim 4, characterized in that: The first end of the first outer plate (4111) is provided with a first flange (4114) extending to the first noise reduction plate (51), and the first end of the second outer plate (4211) is provided with a second flange (4214) extending to the second noise reduction plate (52). The first noise reduction plate (51) is provided with a first blind hole (514) on the side facing the first flange (4114), and the second noise reduction plate (52) is provided with a second blind hole (524) on the side facing the second flange (4214). In the closed state, the first noise reduction plate (51) and the second noise reduction plate (52) have at least a first state and a second state: In the first state, the first blind hole (514) is located on the outside of the first smoke guide plate body (411), and the second blind hole (524) is located on the outside of the second smoke guide plate body (421). In the second state, the first blind hole (514) is opposite to the first flange (4114), and the second blind hole (524) is opposite to the second flange (4214).

14. The hood according to claim 13, characterized in that: In the first state, the first noise reduction holes (53) of the first noise reduction plate (51) and the second noise reduction plate (52) are respectively misaligned with the second noise reduction holes (4115) of the corresponding inner plates, and in the second state, the first noise reduction holes (53) of the first noise reduction plate (51) and the second noise reduction plate (52) are respectively coincided with the second noise reduction holes (4115) of the corresponding inner plates.

15. The hood according to claim 13, characterized in that: The first outer plate (4111) is formed with a first heating cavity (414), and the first heating cavity (414) is provided with a first heating module (415); the second outer plate (4211) is formed with a second heating cavity (424), and the second heating cavity (424) is provided with a second heating module (425).

16. The hood according to claim 1, characterized in that: In the open state, there is a gap between the second end of the first smoke guide plate (41) and the second end of the second smoke guide plate (42). At the second end of the first smoke guide plate (41), the first surrounding plate (412) is provided with a first reflecting plate (413) towards the inner side of the first smoke guide plate (41), and at the second end of the second smoke guide plate (42), the second surrounding plate (422) is provided with a second reflecting plate (423) towards the inner side of the second smoke guide plate (42), the first reflecting plate (413) and the second reflecting plate (423) are both rotationally connected with the corresponding smoke guide plate body, and the rotation axes of the first reflecting plate (413) and the second reflecting plate (423) extend in the front-rear direction.

17. The hood according to claim 1, characterized in that: The first smoke guide plate (41) comprises a first heating module (415), and the second smoke guide plate (42) comprises a second heating module (425).

Images