Range hood

Abstract

The application relates to the household appliance technical field and provides a range hood. The range hood comprises a hood body, a condensing plate and a filtering structure; the hood body is provided with an air inlet and a smoke collecting cavity communicated with the air inlet; the condensing plate is connected to the hood body and arranged below the air inlet, the condensing plate is arranged to be inclined from the front side to the back side and from the top to the bottom, the condensing plate and the cavity wall of the smoke collecting cavity jointly form a negative pressure cavity which is open at least on the left side, the right side and the front side, and the negative pressure cavity is communicated with the air inlet; the filtering structure is arranged at the air inlet and comprises at least a first filter screen, the first filter screen is provided with a plurality of first filter holes arranged at intervals, at least the first filter holes close to the front side are provided with first flow guide inclined portions which are protruded from the first filter screen in the up-down direction, and the first flow guide inclined portions are arranged to be inclined from the hole wall close to the back side of the first filter holes to the opening on the front side. The range hood provided by the application is beneficial to the oil fume to enter the inside of the range hood more smoothly and timely, and reduces the air volume loss and energy loss.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a range hood. Background Technology

[0002] Range hoods primarily use fans to draw in cooking fumes, filter them, and then release them. Currently, range hoods typically have filters installed at the air intake to remove oil droplets, water droplets, and large particulate pollutants from the fumes.

[0003] However, because the filter itself creates flow resistance, the effective airflow of the fan decreases. Furthermore, to improve the filter's effectiveness in filtering fumes, methods such as reducing the filter pore size or increasing the number of filter layers are often employed, which further increases the filter's flow resistance, leading to significant airflow loss. Simultaneously, as fumes pass through the filter, collisions and other factors easily alter their flow direction, causing turbulent airflow into the range hood and resulting in energy loss. Summary of the Invention

[0004] Therefore, it is necessary to provide a range hood that can facilitate the smoother and more timely entry of cooking fumes into the hood, thereby reducing airflow and energy loss.

[0005] This application provides a range hood, including a range hood body, a condenser plate, and a filter structure. The range hood body has an air inlet and a smoke collection chamber communicating with the air inlet. The smoke collection chamber has a front side, a rear side, a left side, and a right side. The condenser plate is connected to the range hood body and is located below the air inlet. The condenser plate is inclined from the front side to the rear side and from top to bottom. The condenser plate and the cavity wall of the smoke collection chamber together form a negative pressure cavity that is open at least on the left side, the right side, and the front side. The negative pressure cavity is communicating with the air inlet. The filter structure is located at the air inlet and includes at least a first filter screen. The first filter screen has a plurality of spaced-apart first filter holes. At least the first filter hole near the front side has a first guide slope protruding from the first filter screen in a vertical direction. The first guide slope is inclined from the hole wall of the first filter hole near the rear side toward the open front side.

[0006] Understandably, the condenser plate is inclined from front to back and from top to bottom, so that the distance between it and the smoke collection chamber wall gradually changes in the front-to-back direction. Specifically, the distance is smaller and the negative pressure chamber is shallower at the front, while the distance is larger and the negative pressure chamber is deeper at the rear. This geometric feature makes the flow cross-sectional area of ​​the front opening smaller than that of the left and right openings. Under the condition that the pressure in the negative pressure chamber is approximately uniform, according to the principle of continuity, the oil fume flow velocity at the front opening is higher than that on the left and right sides, forming an asymmetrical smoke intake pattern of directional high-speed intake at the front and wide-area low-pressure entrainment on the left and right sides: the high-speed airflow at the front direction gathers the oil fume towards the air inlet, while the left and right openings, with their larger coverage area, bring the laterally dispersed oil fume into the negative pressure range. Together, these three elements form a surrounding smoke intake channel, expanding the effective smoke collection area. On this basis, the first filter hole near the front is provided with a first guide slope that slopes from the rear hole wall towards the front opening. After entering the negative pressure chamber through the front opening, the cooking fumes carry an oblique velocity component. The inclination direction of the first guide slope matches the incoming flow direction, smoothly guiding the fumes towards the air inlet. This gradual change in airflow direction avoids abrupt turns and collisions at the edge of the first filter hole, thereby reducing local resistance and turbulence generation. This allows the fumes to enter the fume collection chamber with lower energy loss. Thus, the high-speed directional suction from the front and the wide-range entrainment from the left and right sides created by the inclined geometry of the condenser plate, combined with the low-resistance introduction from the first guide slope at the first filter hole, form a progressively synergistic effect along the fume flow path. This expands the effective collection range while reducing flow energy loss, improving the overall fume collection efficiency.

[0007] Furthermore, it should be noted that if only the aforementioned inclined condenser plate structure is installed without a corresponding first guide slope inclined towards the front opening at the first filter hole, then when the large amount of high-speed oil fumes accelerated and oriented by the negative pressure chamber reach the first filter screen at the air inlet, the oil fume flow direction will be forced to change sharply due to the first filter hole being perpendicular to the airflow direction or having an inconsistent orientation. This will cause a violent collision with the edge of the first filter hole, not only resulting in a sudden increase in local resistance and airflow loss, but also easily forming turbulence at the first filter screen, weakening the motion inertia established by the high-speed airflow at the front. As a result, the directional induction effect achieved by the inclined condenser plate structure is greatly attenuated at the first filter screen and cannot be effectively transmitted to the inside of the smoke collection chamber. Conversely, if only an inclined first guide slope is provided at the first filter hole without the aforementioned inclined condenser plate structure, the inclined direction of the first filter hole lacks a pre-defined guide for the airflow path. When the fumes reach the filter screen, their incoming flow direction is dispersed and disordered. The first guide slope, lacking a matching mainstream fume direction, cannot effectively guide the fumes. Simultaneously, due to the non-uniform negative pressure distribution and high-speed directional airflow at the front without the condenser plate, the fumes lack pre-gathering and acceleration during their ascent. The first guide slope can only reduce resistance locally at the first filter screen, but cannot fundamentally improve the fume capture range and entry efficiency. Lateral escape and turbulence losses are still difficult to avoid. Therefore, the differentiated negative pressure distribution and asymmetric velocity induction achieved by the inclined condenser plate structure, together with the guiding force of the first guide slope at the first filter hole, form an indispensable synergy: the former is responsible for gathering, accelerating, and orienting the fumes before they enter the first filter screen, while the latter is responsible for receiving and maintaining the flow results of the former with minimal resistance when the fumes pass through the first filter screen. The two form a continuous relay on the fume path. The absence of any one of these elements will lead to a significant decrease in the efficiency of oil fume collection, making it impossible to achieve the overall high-efficiency and low-resistance oil fume absorption effect described in this application.

[0008] In some embodiments, the projection of the condenser plate is larger than the projection of the air inlet along the vertical direction. This arrangement facilitates the formation of a larger negative pressure cavity between the condenser plate and the wall of the smoke collection chamber, and can increase the area of ​​the condenser plate that can receive oil droplets, thereby reducing oil droplet contamination.

[0009] In some embodiments, the first flow-guiding slope is inclined from back to front and from top to bottom. This arrangement allows the first flow-guiding slope to protrude from the lower surface of the first filter screen and extend directly into the negative pressure chamber, significantly improving the flow guiding effect; furthermore, when other structures are provided above the first filter screen, assembly interference can be reduced.

[0010] In some embodiments, the first filter screen has an air inlet boundary, the opening and the first filter screen have a first vertical distance H1, the opening and the adjacent air inlet boundary have a second front-to-back distance L1, and the first guide slope has a first included angle α with the vertical plane, the first included angle α satisfying:

[0011] 0°<α< .

[0012] That is, by defining the first included angle between the first flow guiding inclined portion and the vertical plane, a better flow guiding effect is ensured, and the risk of weakened flow guiding effect caused by excessively gentle inclination of the first flow guiding inclined portion relative to the first filter screen due to an excessively large first included angle is reduced.

[0013] In some embodiments, the first filter hole has a first aperture L2 along the front-rear direction, the first flow guiding inclined portion has a first length B along its own inclined direction, and the first length B satisfies:

[0014] 0.2 ≤B≤1.5 .

[0015] Therefore, by defining the first length of the first flow guiding inclined portion, the flow resistance to oil fume is reduced on the basis of ensuring that it has sufficient flow guiding effect.

[0016] In some embodiments, there is a third spacing H2 along the up-down direction between the first filter hole and the inclined end of the first flow guiding inclined portion, and the third spacing H2 satisfies:

[0017] H2= .

[0018] Such arrangement ensures that the bottom of the first flow guiding inclined portion is exactly located below the hole wall of the first filter hole, which reduces wind resistance while ensuring the flow guiding effect.

[0019] In some embodiments, the inclined end of the first flow guiding inclined portion and the hole wall of the first filter hole jointly define a first via hole, the first via hole has a first width W1 parallel to the first filter screen, and the first width W1 satisfies: 2mm≤W1≤12mm. Defining the first width is equivalent to defining the size of the corresponding first filter hole, so as to balance the filtering effect of the first filter screen and the wind resistance of the first filter screen.

[0020] In some embodiments, along the front-rear direction, there is a first gap K1 between any two adjacent first filter holes, 0.5≤K1<L2; and / or, along the left-right direction, there is a second gap K2 between any two adjacent first filter holes, 0.5≤K2<W1. Defining the first gap and the second gap ensures good filtering effect and structural strength while reducing wind resistance.

[0021] In some embodiments, 1mm ≤ L2 ≤ 12mm. By limiting the first aperture, good filtration effect at the first filter hole is achieved while ensuring reduced wind resistance. In conjunction with the first guide slope, the oil fume can also be better diverted.

[0022] In some embodiments, the first guide slope is curved, which reduces the resistance of the oil fume and helps guide the oil fume to flow gently upward.

[0023] In some embodiments, the first guide slope includes a sloped section and an arc-shaped section connected along its own inclined direction, with the end of the arc-shaped section opposite to the sloped section connected to the wall of the first filter hole. The sloped section facilitates the upward inclined flow of the laterally flowing fumes, and then the arc-shaped section generates an upward flow trend in the vertical direction, which is more conducive to adapting to the flow pattern at the fan intake and reducing wind resistance.

[0024] In some embodiments, the range hood body includes a shell surrounding a cavity and a fan disposed within the cavity. Along the front-to-back direction, a first region exists between the fan's air intake and the cavity wall. The range of the first filter holes with the first guide slope at least covers this first region. That is, a first guide slope can be provided at each of the first filter holes corresponding to the first region. The inclined arrangement of the first guide slope helps guide the fumes to flow more smoothly towards the fan's air intake, reducing air pressure loss.

[0025] In some embodiments, the first filter hole near the left side is provided with a second flow guide slope, which increases the air intake volume and improves the flow guiding effect.

[0026] In some embodiments, the first filter hole near the right side is provided with a third flow-guiding slope. The opening on the right side further increases the air intake range, thereby improving the flow-guiding effect.

[0027] In some embodiments, the second flow guide slope is inclined from the hole wall corresponding to the first filter hole near the right side toward the opening on the left side; and / or, the third flow guide slope is inclined from the hole wall corresponding to the first filter hole near the left side toward the opening on the right side.

[0028] This design ensures that the flow-guiding effect of the inclined section can adapt to the direction of the oil fume flow, further enhancing the flow-guiding effect.

[0029] In some embodiments, the condenser plate includes a left inclined portion and a right inclined portion arranged in a left-right direction, the left inclined portion being inclined from right to left and from top to bottom, and the right inclined portion being inclined from left to right and from top to bottom.

[0030] This setup ensures a wider area at the left and right openings, increasing the airflow into the negative pressure chamber and allowing more cooking fumes to flow into the chamber.

[0031] In some embodiments, the condenser plate further includes a straight section connected between the left inclined section and the right inclined section. The straight section creates a stable convergence zone between the left and right inclined sections, reducing the risk of turbulence caused by direct impact between the two directions of oil fumes. It also facilitates the gradual separation of oil fumes from the condenser plate at the highest points of the inclined sections, allowing them to flow upwards and resulting in a more stable flow towards the fan.

[0032] In some embodiments, the condenser plate is provided with an oil storage tank at its lowest inclined point, and the tank wall facing the rear side is connected to the cavity wall facing the rear side of the smoke collection chamber.

[0033] In other words, while the condenser plate and the wall of the smoke collection chamber together form a negative pressure chamber to increase the flow of oil fumes, the inclined design of the plate can also guide the oil droplets falling on the upper surface to the oil storage tank for collection. Furthermore, the connection between the tank wall and the chamber wall ensures that there is no opening at the rear of the negative pressure chamber, which helps to enhance the negative pressure intensity at the front, right, and left openings, and significantly improves the suction efficiency of the negative pressure chamber.

[0034] In some embodiments, the pore size of the first filter pore increases from the front side to the rear side, so as to disperse the flow of oil fumes through the first filter layer by layer, which facilitates more oil fumes to pass through the rear side as well, thereby improving the utilization rate of the first filter at the rear side.

[0035] In some embodiments, the filtration structure further includes a second filter and a third filter disposed vertically on the side of the first filter facing away from the condenser plate, with the second filter positioned between the first filter and the third filter. In other words, the overall filtration effect of the filtration structure is improved through the cooperation of the first, second, and third filters.

[0036] In some embodiments, the second filter screen is wavy; and / or, the third filter screen is provided with a plurality of spaced third filter holes, the axis of which is parallel to the up-down direction.

[0037] By using the wavy second filter, the filter structure can form a spatially interlaced three-dimensional structure, thereby increasing the air path, improving the filtration effect, and reducing the flow resistance when multiple filters are stacked. Furthermore, the third filter hole plays a rectifying role in the flow of fumes, ensuring that the outflowing fumes have an upward flow trend in the vertical direction, further reducing turbulence and wind resistance. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a range hood provided in one embodiment of this application;

[0040] Figure 2 This is a partial cross-sectional view of a range hood provided in an embodiment of this application;

[0041] Figure 3 This is a partial cross-sectional view of the first filter screen in a range hood provided in an embodiment of this application;

[0042] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0043] Figure 5 This is a partial dimensional schematic diagram of the first filter screen in a range hood provided in an embodiment of this application;

[0044] Figure 6 This is a partial top view of the first filter screen in a range hood provided in an embodiment of this application;

[0045] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0046] Figure 8 This is a partial schematic diagram of the filter structure in a range hood provided in an embodiment of this application;

[0047] Figure 9 This is a partial side view of the filter structure in a range hood provided in an embodiment of this application;

[0048] Figure 10 This is a partial schematic diagram of the second filter screen in a range hood provided in an embodiment of this application.

[0049] Figure label:

[0050] 10. Main body of the range hood; 11. Outer shell; 12. Fan; 13. Smoke hood; 20. Condensing plate; 21. Left inclined section; 22. Right inclined section; 23. Straight section; 24. Oil reservoir; 25. Connecting arm; 30. Filter structure; 31. First filter screen; 32. Second filter screen; 33. Third filter screen; 101. Air inlet; 102. Smoke collection chamber; 103. First area; 1101. Cavity; 311. First filter hole; 312. First guide inclined section; 313. First through hole; 314. Air inlet boundary; 321. Second filter hole; 331. Third filter hole; 401. Negative pressure chamber; 3111. Front side hole wall; 3112. Rear side hole wall; 4011. Front opening; 4012. Left side opening; 4013. Right side opening. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0052] It should be noted that when a component is referred to as being "fixed to," "set on," or "located on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0056] In related technologies, filters are installed at the air intake of range hoods to filter cooking fumes. However, because the filters create flow resistance while still providing filtration, the effective airflow of the fan decreases, resulting in insufficient and inadequate extraction of cooking fumes. Furthermore, to improve filtration and reduce the odor of the exhaust air, methods such as reducing the filter pore size or increasing the number of filter layers are used. These methods further increase the flow resistance of the filter, leading to even greater airflow loss. Simultaneously, cooking fumes collide with the filter as they pass through, such as colliding with the area between the filter pores or with the pore walls, altering the flow direction of the fumes. This not only results in airflow loss but also causes turbulent airflow into the range hood, leading to energy loss.

[0057] Based on this, please refer to Figures 1 to 4This application provides an embodiment of a range hood that facilitates smoother and more timely entry of cooking fumes into the hood, reducing airflow and energy loss. The range hood includes a main body 10, a condenser plate 20, and a filter structure 30. The main body 10 has an air inlet 101 and a smoke collection chamber 102 connected to the air inlet 101. The smoke collection chamber 102 has a front side, a rear side, a left side, and a right side. The condenser plate 20 is connected to the main body 10 and located below the air inlet 101. The condenser plate 20 is inclined from the front to the rear and from top to bottom. The condenser plate 20 and the cavity wall of the smoke collection chamber 102 together form a negative pressure chamber 401 that is open at least on the left, right, and front sides. The negative pressure chamber 401 is connected to the air inlet 101. The filter structure 30 is located at the air inlet 101 and includes at least a first filter screen 31. The first filter screen 31 has a plurality of spaced first filter holes 311. At least the first filter hole 311 near the front side has a guide slope protruding from the first filter screen 31 in the vertical direction. The first guide slope 312 is inclined from the hole wall near the rear side of the first filter hole 311 toward the opening on the front side.

[0058] The opening located at the front is referred to as the front opening 4011, the opening on the left is referred to as the left opening 4012, and the opening on the right is referred to as the right opening 4013. The first filter hole 311 near the front has a front hole wall 3111 and a rear hole wall 3112 arranged in the front-rear direction, and a first guide slope 312 is connected to the rear hole wall 3112. Meanwhile, the smoke collection chamber 102 is located below the air inlet 101 to improve the smoke collection effect. The smoke machine body 10 includes a housing 11 with a cavity 1101 and a fan 12 located within the cavity 1101. The bottom of the housing 11 has an air inlet 101, and the top of the housing 11 has an exhaust port. The smoke machine body 10 also includes a smoke collection hood 13 connected to the bottom of the housing 11, which encloses and forms the smoke collection chamber 102. During cooking, the fan 12 draws in indoor cooking fumes, which are then guided and collected by the smoke collection chamber 102 and flow to the air inlet 101. After being filtered by the filter structure 30 at the air inlet 101, the fumes flow into the cavity 1101 and are then discharged from the exhaust vent. In actual use, additional filters can be added between the exhaust vent and the fan 12 for secondary filtration to further reduce the odor of cooking fumes in the exhaust gas.

[0059] When the fumes are drawn into the interior of the range hood body 10 (i.e., cavity 1101) through the fume collection chamber 102 and the air inlet 101, the fumes rise under negative pressure and contact the lower surface of the condenser plate 20 due to the condenser plate 20 located below the air inlet 101. The fumes then gather and flow in an orderly manner along the surface of the condenser plate 20 using the wall adhesion effect. Some oil droplets adhere to the condenser plate 20 during the contact process, achieving initial separation. At this time, a negative pressure chamber 401 is formed between the condenser plate 20 and the cavity wall of the smoke collection chamber 102. The negative pressure chamber 401 is open on the front and left and right sides, forming a surrounding smoke inlet channel. The front opening 4011 has a smaller opening size than the left and right openings due to the inclined setting of the condenser plate 20. This makes the oil fume flow velocity at the front opening 4011 higher than that on the left and right sides, forming a directional induced airflow that guides the oil fume to preferentially converge in the high-speed area on the front side. The left and right sides cover the lateral path where the oil fume may escape with a larger opening range, thereby expanding the smoke collection range of the negative pressure chamber 401 and improving the smoke inlet efficiency. Meanwhile, after the fumes enter through the front opening 4011 of the negative pressure chamber 401, they need to change from a roughly horizontal direction to an upward flow under the suction of the fan 12 to enter the air inlet 101. Therefore, a first guide slope 312 protruding vertically from the first filter screen 31 is provided at the first filter hole 311. That is, the first guide slope 312 has an inclined bottom-up guiding effect, thereby guiding the fumes to change direction more gently and smoothly to flow upward, reducing the risk of increased local resistance and air volume loss caused by a sharp change in airflow direction. Moreover, it is precisely because the negative pressure chamber 401 can suck up a larger amount of fumes and make them flow quickly that, if there were no guide slope 312, a large amount of fumes would collide head-on with the first filter screen 31 at the air inlet 101, which would increase the flow resistance and generate turbulence, making the airflow in the negative pressure chamber 401 more turbulent. Therefore, this embodiment utilizes the cooperation between the negative pressure chamber 401 and the first guide slope 312 at the first filter hole 311. While increasing the air intake range and flow velocity through the negative pressure chamber 401, the first guide slope 312 is used to guide the oil fumes to gradually change their flow direction, mitigating the increased resistance and turbulence caused by a large amount of oil fumes directly impacting the first filter screen 31. This facilitates the oil fumes entering the cavity 1101 more fully, smoothly, and promptly, reducing airflow and energy losses. Simultaneously, even if a small amount of oil fumes contacts the lower surface of the first guide slope 312 while flowing upwards, the inclined design of the first guide slope 312 guides the oil droplets along its inclined surface, preventing them from stagnating or dripping to unintended locations, thus ensuring the oil fumes flow fully through the first filter hole 311.Of course, it is precisely because the negative pressure chamber 401 has openings on the front, left, and right sides, and the front opening 4011 has a smaller opening size due to the inclination of the condenser plate 20, that the oil fume flow velocity at the front opening is higher than that on the left and right sides. Therefore, at least the first filter hole 311 near the front is provided with a first guide slope 312 to match the mainstream oil fume path guided by the negative pressure chamber 401 and the direction of the high-speed airflow on the front side. This satisfies the requirements for flow diversion and directional induction, while also facilitating manufacturing and reducing costs. In addition, the first guide slope 312 can also form a guide for the downward dripping of condensed oil, making it easier for the oil to drip onto the condenser plate 20 below.

[0060] Furthermore, the projection of the condenser plate 20 in the vertical direction is larger than the projection of the air inlet 101 in the vertical direction, and the projection of the air inlet 101 falls within the projection of the condenser plate 20. This arrangement facilitates the formation of a negative pressure chamber 401 between the condenser plate 20 and the wall of the smoke collection chamber 102, causing the fumes to flow laterally after entering from the open, and then flow upwards to the fan 12 via the first guide slope 312. Moreover, precisely because the projection of the condenser plate 20 is larger, it is more effective at catching oil droplets dripping from the air inlet 101, reducing the risk of oil droplets falling into other areas and causing pollution.

[0061] Please continue reading. Figures 1 to 4 In actual use, the first filter hole 311 penetrates the first filter screen 31 in the vertical direction. The negative pressure chamber 401 has a front opening 4011. For the first guide slope 312 corresponding to the first filter hole 311 on the front side, the first guide slope 312 is connected to the hole wall of the first filter hole 311 facing the rear side. The first guide slope 312 is inclined from back to front and from top to bottom. After the oil fumes are sucked in from the front opening 4011, they smoothly change from horizontal flow to vertical flow along the first guide slope 312.

[0062] Specifically, the wall of the first filter hole 311 can be divided into a front side wall 3111 and a rear side wall 3112 along the front-back direction, and the first guide slope 312 is connected to the rear side wall 3112. The first guide slope 312 can extend from the rear side wall 3112 from top to bottom and from back to front, so that the first guide slope 312 protrudes from the lower surface of the first filter screen 31 and extends directly into the negative pressure chamber 401, significantly improving the guiding effect; moreover, this arrangement ensures that the first guide slope 312 does not occupy the upper space of the first filter screen 31, and when other filters are provided above the first filter screen 31, the overall vertical dimension can be reduced and the assembly interference with other filters can be reduced. At this time, the extended end of the first guide slope 312 and the front side wall 3111 of the first filter hole 311 together form a first through hole 313 for the passage of oil fumes, and the first through hole 313 is located below the first filter hole 311. The axis of the first through hole 313 is set at an angle to the axis of the first filter hole 311, which can be an acute angle or a right angle.

[0063] Of course, the first guide slope 312 can also extend obliquely from the rear side hole wall 3112 from bottom to top and from front to back, so that the first guide slope 312 protrudes from the upper surface of the first filter screen 31. Alternatively, part of the first guide slope 312 protrudes from the upper surface of the first filter screen 31, and another part protrudes from the lower surface of the first filter screen 31. As long as it can satisfy the guiding effect of the first guide slope 312 on the oil fume to smoothly change the flow direction, it is acceptable. This is only an example for illustration.

[0064] It should be added that the front-back, up-down, and left-right directions should be set at angles to each other, for example, they can be perpendicular to each other. The up-down direction is the vertical direction, i.e., the Z-axis direction, the front-back direction can be the Y-axis direction, and the left-right direction is the X-axis direction.

[0065] Please continue reading. Figures 1 to 4 In some embodiments, the first filter hole 311 near the left side is provided with a second flow guiding slope, and the first filter hole 311 near the right side is provided with a third flow guiding slope.

[0066] The walls of the first filter holes 311 near the left and right sides can both be divided into a left wall and a right wall in the left-right direction. A second guide slope is connected to the right wall of the corresponding first filter hole 311 and is inclined from top to bottom and from right to left, i.e., it is inclined from the right wall of the corresponding second filter hole 321 toward the left opening 4012, thereby guiding the oil fumes flowing from left to right through the left opening 4012 to smoothly change direction and flow upward into the cavity 1101. Simultaneously, a third guide slope is connected to the left wall of the corresponding first filter hole 311 and is inclined from top to bottom and from left to right, i.e., it is inclined from the left wall of the corresponding second filter hole 321 toward the right opening 4013, thereby guiding the oil fumes entering from the right opening 4013 and flowing from right to left to smoothly change direction and flow upward into the cavity 1101. This design ensures that the flow-guiding effect of the inclined section can adapt to the direction of the oil fume flow, further enhancing the flow-guiding effect.

[0067] Of course, the orientation of the second and third guide slopes is the same as that of the first guide slope 312, which facilitates manufacturing.

[0068] Please continue reading. Figures 1 to 4 In some embodiments, the range hood body 10 includes a housing 11 surrounding a cavity 1101 and a fan 12 disposed in the cavity 1101. Along the front-rear direction, a first region 103 exists between the air inlet of the fan 12 and the cavity wall of the cavity 1101, and the range of the first filter holes 311 with the first guide slope 312 at least covers the first region 103. That is, all the first filter holes 311 with the first guide slope 312 have a first projection along the vertical direction, and the first region 103 has a second projection along the vertical direction, the second projection coinciding with the first projection. Specifically, the cavity 1101 includes a front cavity wall and a rear cavity wall arranged opposite to each other and spaced apart along the front-rear direction. When the air inlet of the fan 12 faces the front, the first region 103 exists between the air inlet and the front cavity wall. If the air inlet of the fan 12 faces the rear, the first region 103 is located between the air inlet and the rear cavity wall; this is only an example. Among them, the first guide slope 312 corresponding to the first region 103 is inclined from top to bottom and from back to front.

[0069] Understandably, the negative pressure generated by the fan 12 is mainly concentrated in front of the fan 12's air intake, which is the aforementioned first region 103. Therefore, the negative pressure suction effect is most pronounced in front of the air intake. This causes the fumes entering the negative pressure chamber 401 and located in front of the air intake to easily collide with the gap between the first filter holes 311 near the air intake due to the greater suction force, thus forming a vortex zone, causing the fumes to swirl and stagnate. Therefore, a first guide slope 312 can be provided at each of the first filter holes 311 corresponding to the first region 103. By using the inclined arrangement of the first guide slope 312, the fumes can be guided to flow more smoothly to the first region 103, reducing wind pressure loss.

[0070] Alternatively, each of the first filter holes 311 on the first filter screen 31 can be provided with a first guide slope 312, and each first guide slope 312 can be inclined from top to bottom and from back to front. That is, the inclination direction of the first guide slope 312 at each first filter hole 311 can be the same, which is more convenient to manufacture. This is just an example.

[0071] The following explanation will take the first guide slope 312 as an example.

[0072] like Figure 2 and Figure 6 As shown, in some embodiments, the first filter 31 has an air inlet boundary 314, a first distance H1 in the vertical direction is between the opening and the first filter 31, a second distance L1 in the front-back direction is between the opening and the adjacent air inlet boundary 314, and the first guide slope 312 has a first included angle α with the vertical plane, the first included angle α satisfying:

[0073] 0°<α< .

[0074] Specifically, the first included angle between the first guide slope 312 and the vertical plane is the angle between the tangent of the first guide slope 312 along its own inclination direction and the vertical plane. Meanwhile, the air inlet boundary 314 does not refer to the edge of the first filter screen 31, but rather the boundary line of the area on the first filter screen 31 where the first filter holes 311 are located. Taking a rectangular first filter screen 31 as an example, the projected area of ​​the multiple first filter holes 311 along the vertical direction is also rectangular, and the boundary line of this projection is the air inlet boundary 314.

[0075] Taking the negative pressure chamber 401 with a front opening 4011 as an example, the air inlet boundary 314 here refers to the air inlet boundary 314 of the first filter 31 near the front. There is a second distance L1 between the front opening 4011 and the air inlet boundary 314 in the front-to-back direction. This second distance refers to the lateral path that the fumes need to move laterally in the negative pressure chamber 401 after entering from the front opening 4011. The front opening 4011 and the first filter 31 have a first distance H1 in the vertical direction. Taking the condenser plate 20 located at the front opening 4011 with a plane parallel to the first filter 31 as an example, the first distance is the vertical distance between the first filter 31 and the plane, which is the longitudinal path that the fumes need to flow upward in the vertical direction after entering the negative pressure chamber 401 from the bottom of the front opening 4011, i.e., the largest longitudinal path. Therefore, it is necessary to limit the first included angle α between the first guide slope 312 and the vertical plane (i.e., the plane along the up and down direction) to ensure better flow guidance effect, reduce the risk that the first guide slope 312 will be too gently tilted relative to the first filter screen 31 due to the first included angle being too large, thereby weakening the flow guidance effect, and reduce the risk that the wind resistance will increase due to the first included angle being too small.

[0076] In other embodiments, for the left opening 4012, taking the air inlet boundary 314 near the left as a reference, when the second guide slope is inclined toward the left opening 4012, the angle between the second guide slope and the vertical plane can also satisfy the above range; and for the right opening 4013, taking the air inlet boundary 314 near the right as a reference, when the third guide slope is inclined toward the right opening 4013, the angle between the third guide slope and the vertical plane can also satisfy the above range.

[0077] Please see Figure 2 and Figure 5 In some embodiments, the first filter aperture 311 has a first aperture L2 along the front-to-back direction, and the first guide slope 312 has a first length B along its own inclined direction, the first length B satisfying:

[0078] 0.2 ≤B≤1.5 .

[0079] by Taking B1 as an example, the inclined end of the first guide slope 312 can be located between the front hole wall 3111 and the rear hole wall 3112, then B = 0.2B1 - B1 (excluding B1); or, the inclined end of the first guide slope 312 is located directly below the front hole wall 3111 of the first filter hole 311, then B = B1; or, the inclined end of the first guide slope 312 is located on the front side of the front hole wall 3111, then B = B1 - 1.5B1 (excluding B1).

[0080] Understandably, the first length of the first guide slope 312 should not be too large. If it is too large, the protrusion of the first guide slope 312 relative to the first filter screen 31 will be too large, causing obstruction of the lateral flow of oil fumes within the negative pressure chamber 401. Furthermore, if the first length is too large, the first guide slope 312 may extend below the interval between any two adjacent first filter holes 311, or even below adjacent first filter holes 311, interfering with the flow of oil fumes. Conversely, the first length of the first guide slope 312 should not be too small either. If it is too small, it will not have enough length to smoothly guide the oil fumes and change their flow direction, weakening the guiding effect. Therefore, it is necessary to limit the first length of the first guide slope 312 to ensure that it has sufficient guiding effect while reducing the flow resistance of oil fumes.

[0081] Wherein, if the first filter hole 311 is a circular hole, then the first aperture is the aperture diameter of the first filter hole 311. If the first filter hole 311 is an elliptical hole, then the first filter hole 311 has a first aperture in the front-back direction and a second aperture in the left-right direction. For example, the major axis of the elliptical hole can be the first aperture diameter, and the minor axis can be the second aperture diameter. This is only an example for illustration.

[0082] Furthermore, there is a third distance H2 in the vertical direction between the first filter hole 311 and the inclined end of the first guide slope 312, and the third distance H2 satisfies:

[0083] H2= .

[0084] Since the inclined end of the first guide slope 312 and the wall of the first filter hole 311 together form the first through hole 313, the oil fumes flow through the first through hole 313 to the first filter hole 311. Therefore, the third distance is actually the air inlet height of the first through hole 313. If the third distance is too large, that is, the larger the protrusion of the guide slope relative to the lower surface of the first filter screen 31, the longer the first length of the first guide slope 312 may be, which may easily cause interference with the flow of oil fumes. Of course, if the third distance is too small, that is, the smaller the protrusion of the first guide slope 312 relative to the lower surface of the first filter screen 31, the shorter the first length will be, which will weaken the guiding effect. Therefore, it is necessary to combine the relationship between the first aperture of the first filter hole 311 and the first included angle between the first guide slope 312 and the vertical plane to limit the third spacing, so as to ensure that the bottom of the first guide slope 312 is exactly below the hole wall of the first filter hole 311, that is, the inclined end is exactly below the front hole wall 3111 of the first filter hole 311, so as to reduce wind resistance while ensuring the flow guiding effect.

[0085] Furthermore, the aforementioned first aperture L2 satisfies: 1mm ≤ L2 ≤ 12mm. The first aperture should not be too large, as this would weaken the filtration effect of the airflow passing through it and result in an excessively long first guide slope 312. Conversely, the first aperture should not be too small either, as this would increase wind resistance and result in an excessively short first guide slope 312. Therefore, by limiting the first aperture, while ensuring reduced wind resistance, the filtration effect at the first filter hole 311 is good, and in conjunction with it, the first guide slope 312 can better guide the oil fumes.

[0086] In some specific embodiments, the first aperture L2 is any value between 1mm and 12mm, such as 1mm, 2mm, 3mm, 4mm, 4.5mm, 5mm, 5.6mm, 5.8mm, 6mm, 6.8mm, 7mm, 7.4mm, 8mm, 8.4mm, 9mm, 9.66mm, 10mm, 10.68mm, 11mm, 11.7mm, and 12mm.

[0087] Please see Figures 3 to 7 In some embodiments, the inclined end of the first guide slope 312 and the wall of the first filter hole 311 together form a first through hole 313. Taking the first filter hole 311 on the front side as an example, the inclined end of the first guide slope 312 and the front hole wall 3111 together form the first through hole 313. The first through hole 313 has a first width W1 parallel to the first filter screen 31, and the first width W1 satisfies: 2mm≤W1≤12mm. Taking the first filter hole 311 near the front side as an example, the first width of the corresponding first through hole 313 is the dimension along the left and right direction. Similarly, if the first width is too large, the aperture of the first filter hole 311 will be too large, weakening the filtration effect; conversely, if the first width is too small, the aperture of the corresponding first filter hole 311 will be too small, increasing the air resistance. Therefore, by limiting the first width, it is also equivalent to limiting the size of the corresponding first filter hole 311, so as to balance the filtration effect and air resistance of the first filter screen 31.

[0088] In some specific embodiments, the first width is any value between 2mm and 12mm, such as 2mm, 2.65mm, 3mm, 3.78mm, 4mm, 4.56mm, 5mm, 5.4mm, 5.8mm, 6mm, 6.6mm, 7mm, 7.5mm, 8mm, 8.6mm, 9mm, 9.6mm, 10mm, 10.48mm, 11mm, 11.6mm, and 12mm.

[0089] In some embodiments, in the front-rear direction, there is a first gap K1 between any two adjacent first filter holes 311, where 0.5≤K1<L2. The first gap reflects the spacing between the first filter holes 311 in the front-rear direction. That is, the first gap cannot be larger than the first aperture of the first filter hole 311. A larger first gap indicates a lower density of the first filter holes 311, which increases the wind resistance when oil fume flows through the first filter screen 31. Conversely, an excessively small first gap indicates a higher density of the first filter holes 311. Although this improves the filtering effect, it also reduces the strength of the first filter screen 31 itself. Therefore, defining the first gap ensures good filtering effect and structural strength while reducing wind resistance. For example, the first gap can be 0.5mm, 0.85mm, 0.98mm, 1mm, 1.25mm, 1.55mm, etc., as long as it is greater than or equal to 0.5mm and smaller than the first aperture.

[0090] Further, in the left-right direction, there is a second gap K2 between any two adjacent first filter holes 311, where 0.5≤K2<W1. The second gap reflects the spacing between the first filter holes 311 in the left-right direction. That is, the second gap cannot be larger than the first width of the aforementioned first through hole 313. If the second gap is larger than the first width, the distribution of the first filter holes 311 and the corresponding first through holes 313 will be sparse, which is not conducive to the circulation of a large amount of oil fume; conversely, if the second gap is too small, for example, less than 0.5mm, it will reduce the strength of the first filter screen 31. For example, the second gap can be 0.5mm, 0.7mm, 0.9mm, 1mm, 1.2mm, 1.5mm, etc., as long as it is greater than or equal to 0.5mm and smaller than the first width of the first through hole 313.

[0091] Wherein, the first filter holes 311 are arranged in multiple rows spaced apart along the front-rear direction, and any two adjacent rows of first filter holes 311 are arranged staggered in the left-right direction.

[0092] As shown in Figure 3 and Figure 4 , in some embodiments, the first flow-guiding inclined portion 312 is arranged in a curved shape, which reduces the wind resistance of oil fume and facilitates guiding oil fume to flow upward gently. For example, the first flow-guiding inclined portion includes an arc segment and an inclined segment along its own inclined direction, the two are connected, and the end of the arc segment facing away from the inclined segment is connected to the hole wall of the first filter hole 311. The arc segment has a tendency to guide upward in the up-down direction, and the arc segment and the inclined segment have a smooth transition. The inclined segment facilitates guiding transversely flowing oil fume to flow obliquely upward, and then the arc segment generates a tendency to flow upward in the up-down direction, which is more conducive to adapting to the flow law at the air suction inlet of the fan 12 and reducing wind resistance.

[0093] Please refer to Figure 1In some embodiments, the condenser plate 20 includes a left inclined portion 21 and a right inclined portion 22 arranged in a left-right direction. The left inclined portion 21 is inclined from right to left and from top to bottom, and the right inclined portion 22 is inclined from left to right and from top to bottom. The condenser plate 20 is flat to meet the lightweight design requirements. Based on the condenser plate 20's front-to-back and top-to-bottom inclination, the arrangement of the left inclined portion 21 and the right inclined portion 22 slightly increases the height of the left opening 4012 and the right opening 4013 in the vertical direction. After the fumes enter through the left opening 4012 and the right opening 4013, the flow cross-section gradually narrows, thereby accelerating the fumes entering through the left opening 4012 and the right opening 4013 towards the center of the negative pressure chamber 401. That is, a strong negative pressure extreme point is formed in the central region of the negative pressure chamber 401, which generates a focusing traction force on the fumes, improves the smoke collection effect, and reduces the indoor airflow disturbance during the rise of the fumes. Simultaneously, the fumes flowing in through the left opening 4012, following the tilt direction of the left inclined section 21, have an upward velocity vector and flow to the upper right, thus generating clockwise tangential momentum. Furthermore, the fumes flowing in through the right opening 4013, following the tilt direction of the right inclined section 22, have an upward velocity vector and flow to the upper left, thus generating counterclockwise tangential momentum. Therefore, the left, right, and front airflows work together to form a spiraling upward state in the middle of the negative pressure chamber 401, further entraining the fumes near the edge area, thus further increasing the fume collection effect and the fume capture range.

[0094] Furthermore, the condenser plate 20 also includes a straight section 23, which connects the left inclined section 21 and the right inclined section 22. This means the straight section 23 connects to the highest point of the left inclined section 21 and the right inclined section 22. If the left inclined section 21 and the right inclined section 22 are used directly to form an eaves-like condenser plate 20, it would result in a pointed top in the middle. If high-speed fumes flow along this pointed top, the fumes from the left and right sides would collide and disperse at the top, creating unstable turbulence and generating wind noise. Therefore, the straight section 23 effectively creates a stable flow zone, ensuring that the fumes flowing in from the left opening 4012 along the left inclined section 21 and from the right opening 4013 along the right inclined section 22 form a more stable convergence zone in the straight section 23. This reduces the risk of turbulence caused by direct collisions between the fumes from the two directions and also reduces wind noise. Furthermore, the straight section 23 facilitates the gradual separation of oil fumes from the condenser plate 20 at the highest point of the inclined sections on both sides, allowing them to flow upwards and resulting in a more stable flow of oil fumes towards the fan 12. In addition, the straight section 23 is equivalent to adding a reinforced area between the inclined sections on both sides, improving the structural strength and rigidity of the condenser plate 20 itself, thereby reducing the risk of vibration and resonance of the condenser plate 20 under the high-speed impact of oil fumes, and further reducing wind noise.

[0095] In some specific embodiments, the straight portion 23, the left inclined portion 21, and the right inclined portion 22 are integrally formed, for example, by bending a sheet metal part. The straight portion 23, the left inclined portion 21, and the right inclined portion 22 are arranged as a whole from the front to the rear and from top to bottom.

[0096] Please see Figure 1 and Figure 2 In some embodiments, the condenser plate 20 is provided with an oil storage tank 24 at its inclined bottom. That is, while the condenser plate 20 and the cavity wall of the smoke collection chamber 102 together form a negative pressure chamber 401 to increase the flow of oil fumes, the inclined setting of the condenser plate 20 can also guide the oil droplets dripping onto the upper surface to flow into the oil storage tank 24. It can be understood that because the condenser plate 20 is located below the air inlet 101, the oil fumes flowing through the filter structure 30 are filtered by the filter structure 30, and the oil droplets attached to the filter structure 30 will drip onto the upper surface of the condenser plate 20 under the action of gravity; and because each of the first filter holes 311 on the first filter screen 31 is provided with a first guide slope 312, the oil droplets attached to the hole wall of the first filter hole 311 will drip down along the first guide slope 312 onto the upper surface of the condenser plate 20 under the action of gravity. Therefore, the condenser plate 20 can be inclined from the front to the rear and from top to bottom, which also helps to guide the oil droplets to the bottom oil storage tank 24, so as to collect the oil droplets.

[0097] Furthermore, the tilt angle of the condenser plate 20 is greater than 2°, meaning that the tilt angle of the condenser plate 20 from front to back and from top to bottom is greater than 2°, or the angle between the condenser plate 20 and the horizontal plane is greater than 2°. For example, the tilt angle of the condenser plate 20 can be 2.1°, 2.5°, 2.9°, 3°, 3.2°, 3.4°, 3.5°, 4°, 5°, etc. In some specific embodiments, the tilt angle of the condenser plate 20 is not less than 2.5°, for example, it can be 2.5°, 2.8°, 3.1°, 3.3°, 3.6°, 3.7°, 4.2°, 4.8°, 5.2°, 5.5°, 5.8°, 6°, etc. In other words, by setting the tilt angle of the condenser plate 20, it is more conducive to guiding oil droplets to flow towards the oil storage tank 24. Of course, if the tilt angle of the condenser plate 20 is too small, the size of the front opening 4011 will be less different from the size of the rear area of ​​the negative pressure chamber 401, weakening the front suction effect. This will reduce the suction effect and range in the middle of the negative pressure chamber 401, causing the fumes to swirl within the chamber for a longer period, resulting in energy consumption and reduced fan efficiency. Conversely, if the tilt angle of the condenser plate 20 is too large, the size of the front opening 4011 will be too small, increasing the static pressure loss inside the negative pressure chamber 401. This not only increases wind noise but also requires the fan 12 to consume more power to overcome wind resistance, resulting in a significant reduction in effective exhaust volume and making the fan 12 more susceptible to damage. For example, the maximum tilt angle of the condenser plate 20 from front to back and from top to bottom should not exceed 23°. Therefore, the tilt angle of the condenser plate 20 needs to be limited to reduce wind noise and improve the protection of the fan 12 while enhancing the smoke collection effect and the range of fume capture.

[0098] Similarly, the inclination angles of the left inclined portion 21 and the right inclined portion 22 on both sides of the aforementioned condenser plate 20 should not be too large or too small, otherwise they will affect the suction and smoke collection effects of the negative pressure chamber 401. The inclination angles of the left inclined portion 21 and the right inclined portion 22 are the same and are both smaller than the overall inclination angle of the condenser plate 20 from front to back and from top to bottom, so as to ensure directional high-speed suction at the front opening 4011. For example, the inclination angles of the left inclined portion 21 and the right inclined portion 22 are both greater than 2.5° and do not exceed 15°, such as 2.5°, 2.7°, 3°, 3.4°, 3.7°, 3.9°, 4°, 4.3°, 5°, 5.2°, 5.5°, 6°, 10°, etc. Of course, the inclination angles of the left inclined portion 21 and the right inclined portion 22 can also be basically the same as the overall inclination angle of the condenser plate 20, which is only an example here.

[0099] like Figure 1 and Figure 2As shown, furthermore, the rear-facing wall of the oil storage tank 24 is connected to the rear-facing wall of the smoke collection chamber 102, thereby causing the rear side of the negative pressure chamber 401 to be sealed off. That is, the rear side of the negative pressure chamber 401 is not open; the negative pressure chamber 401 only includes a front opening 4011, a left opening 4012, and a right opening 4013. Since the rear side of the smoke collection chamber 102 is usually close to a wall or the back panel of a cabinet, there is less oil smoke here compared to the front. If an opening were also provided on the rear side of the negative pressure chamber 401, some negative pressure would be wasted. Therefore, by connecting the rear wall of the oil storage tank 24 to the rear wall of the smoke collection chamber 102, a three-sided open negative pressure chamber 401 is formed, thereby enhancing the negative pressure intensity at the front opening 4011, the right opening 4013, and the left opening 4012, significantly improving the suction efficiency of the negative pressure chamber 401. Of course, this design also reduces the risk of oil fumes colliding and becoming disordered with the oil fumes at the front opening 4011 due to the rear opening, further improving smoke extraction efficiency. In addition, this design also prevents oil stains from dripping into spaces other than the rear of the range hood body 10.

[0100] In actual use, the oil storage tank 24 can be shaped by bending the condenser plate 20. The condenser plate 20 can be connected to the smoke hood 13 on the rear side via a connecting plate. A sealing strip can be provided on the front side wall of the connecting plate to ensure the sealing of the negative pressure chamber 401 at the rear.

[0101] Furthermore, the condenser plate 20 is provided with a connecting arm 25 at its front side, which is connected to the smoke collection hood 13. The connecting arm 25 can be detachably connected to the smoke collection hood 13, or the connecting arm 25 can be detachably connected to the condenser plate 20, or the connecting arm 25 can consist of two mutually detachably connected arms, which facilitates the assembly and disassembly of the condenser plate 20 relative to the smoke collection chamber 102, and meets the requirements for regular cleaning and maintenance of the condenser plate 20 and the filter structure 30. This is only an example for illustration.

[0102] In some embodiments, the aperture of the first filter hole 311 increases from the front to the rear. The fan 12 can employ both front and rear air intake. In this case, the aperture of the first filter hole 311 gradually increases from front to rear, which can disperse the flow of oil fumes passing through the first filter screen 31 layer by layer, allowing more oil fumes to pass through the rear side and improving the utilization rate of the first filter screen 31 at the rear. The first filter hole 311 near the rear side may or may not have the first guide slope 312, although it may or may not have it.

[0103] Each of the first filter holes 311 can be formed by stamping, thereby integrally stamping out the first guide slope 312. This is only an example.

[0104] Please see Figure 2 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the filter structure 30 further includes a second filter 32 and a third filter 33. The second filter 32 is disposed on the side of the first filter 31 facing away from the condenser plate 20 in the vertical direction, and the third filter 33 is disposed on the side of the second filter 32 facing away from the first filter 31 in the vertical direction, that is, the second filter 32 is disposed between the first filter 31 and the third filter 33. Therefore, the overall filtration effect of the filter structure 30 is improved through the cooperation of the first filter 31, the second filter 32, and the third filter 33.

[0105] The second filter 32 is wavy. The second filter 32 has a plurality of spaced second filter holes 321. By using the wavy second filter 32, the filter structure 30 can form a spatially interlaced three-dimensional structure, thereby increasing the air path, improving the filtration effect, and reducing the flow resistance when multiple filters are stacked.

[0106] Furthermore, the third filter screen 33 is provided with multiple spaced third filter holes 331, the axis of which is parallel to the vertical direction. That is, the third filter holes 331 are arranged through the third filter screen 33 in the vertical direction. This arrangement effectively straightens the flow of oil fumes exiting the filter structure 30, ensuring that the exiting oil fumes have an upward flow tendency in the vertical direction, further reducing turbulence and wind resistance. The orientation of the second filter hole 321 is staggered with that of the first filter hole 311 and the third filter hole 331, which reduces the overlap area of ​​the filter holes.

[0107] This range hood can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the range hood to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A range hood, characterized in that, Comprising: a range hood body (10) provided with an air inlet (101) and a smoke collecting chamber (102) communicating with the air inlet (101), wherein the smoke collecting chamber (102) has a front side, a rear side, a left side and a right side; a condensation plate (20) connected to the range hood body (10) and disposed below the air inlet (101), wherein the condensation plate (20) is inclined from the front side to the rear side and from top to bottom, the condensation plate and the cavity wall of the smoke collecting chamber (102) jointly enclose a negative pressure cavity (401) that is open at least on the left side, the right side and the front side, and the negative pressure cavity (401) communicates with the air inlet (101); and a filtering structure (30) disposed at the air inlet (101) and at least comprising a first filter screen (31), wherein the first filter screen (31) is provided with a plurality of first filter holes (311) arranged at intervals, at least the first filter holes (311) close to the front side are provided with first flow-guiding inclined portions (312) protruding out of the first filter screen (31) in the up-down direction, and the first flow-guiding inclined portions (312) are arranged to incline from the hole wall of the first filter holes (311) close to the rear side toward the open opening on the front side.

2. The range hood according to claim 1, characterized in that, In the up-down direction, the projection of the condensation plate (20) is larger than the projection of the air inlet (101).

3. The range hood according to claim 1, characterized in that, The first flow-guiding inclined portions (312) are arranged to extend inclining from back to front and from top to bottom.

4. The range hood according to claim 1, characterized in that, The first filter screen (31) has an air inlet boundary (314), a first spacing H1 in the up-down direction is formed between the open opening and the first filter screen (31), a second spacing L1 in the front-rear direction is formed between the open opening and the adjacent air inlet boundary (314), and a first included angle α is formed between the first flow-guiding inclined portions (312) and a vertical plane, the first included angle α satisfies: 0°<α＜ 。 5. The range hood according to claim 4, characterized in that, The first filter holes (311) have a first pore diameter L2 in the front-rear direction, the first flow-guiding inclined portions (312) have a first length B along their own inclination direction, the first length B satisfies: 0.2 ≤B≤1.5 。 6. The range hood according to claim 5, characterized in that, A third spacing H2 in the up-down direction is formed between the first filter holes (311) and the inclined ends of the first flow-guiding inclined portions (312), the third spacing H2 satisfies: H2= 。 7. The range hood according to claim 5, characterized in that, The inclined ends of the first flow-guiding inclined portions (312) and the hole walls of the first filter holes (311) jointly enclose first via holes (313), the first via holes (313) have a first width W1 parallel to the first filter screen (31), and the first width W1 satisfies: 2mm≤W1≤12mm.

8. The range hood according to claim 7, characterized in that, In the front-rear direction, a first gap K1 is formed between any two adjacent first filter holes (311), 0.5≤K1<L2; and / or, In the left-right direction, a second gap K2 is formed between any two adjacent first filter holes (311), 0.5≤K2<W1.

9. The range hood according to claim 5, characterized in that, 1mm≤L2≤12mm.

10. The range hood according to claim 1, characterized in that, The first flow-guiding inclined portions (312) are arranged in a curved shape.

11. The range hood according to claim 10, characterized in that, The first flow-guiding inclined portion (312) comprises an inclined surface section and an arc surface section connected along the own inclination direction of the first flow-guiding inclined portion, and the end of the arc surface section facing away from the inclined surface section is connected with the hole wall of the first filter hole (311).

12. The range hood according to claim 1, characterized in that, The main body (10) of the smoke hood includes an outer shell (11) surrounding a cavity (1101) and a fan (12) disposed in the cavity (1101). Along the front-back direction, there is a first region (103) between the air inlet of the fan (12) and the cavity wall of the cavity (1101). The range of the first filter hole (311) provided with the first guide slope (312) at least covers the first region (103).

13. The range hood according to claim 1, characterized in that, The first filter hole (311) near the left side is provided with a second flow guide slope.

14. The range hood according to claim 13, characterized in that, The first filter hole (311) near the right side is provided with a third flow guide slope.

15. The range hood according to claim 14, characterized in that, The second flow guide slope is inclined from the hole wall on the right side of the first filter hole (311) toward the opening on the left side; and / or, the third flow guide slope is inclined from the hole wall on the left side of the first filter hole (311) toward the opening on the right side.

16. The range hood according to claim 14, characterized in that, The condenser plate (20) includes a left inclined portion (21) and a right inclined portion (22) arranged in the left-right direction. The left inclined portion (21) is inclined from right to left and from top to bottom, and the right inclined portion (22) is inclined from left to right and from top to bottom.

17. The range hood according to claim 16, characterized in that, The condenser plate (20) also includes a straight section (23) which is connected between the left inclined section (21) and the right inclined section (22).

18. The range hood according to claim 1, characterized in that, The condenser plate (20) is provided with an oil storage tank (24) at the lowest point of its inclination. The oil storage tank (24) is connected to the rear wall of the smoke collection chamber (102) to the rear wall.

19. The range hood according to claim 1, characterized in that, From the front side to the rear side, the pore size of the first filter hole (311) tends to increase.

20. The range hood according to any one of claims 1 to 19, characterized in that, The filter structure (30) further includes a second filter (32) and a third filter (33) disposed along the vertical direction on the side of the first filter (31) away from the condenser plate (20), with the second filter (32) disposed between the first filter (31) and the third filter (33).

21. The range hood according to claim 20, characterized in that, The second filter (32) is wavy; and / or, The third filter screen (33) is provided with a plurality of spaced third filter holes (331), the axial direction of which is parallel to the up and down direction.

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