Range hood

Abstract

The range hood comprises a shell and a ventilation assembly, the ventilation assembly comprises a first ventilation part and a second ventilation part which are arranged in the shell, and the first ventilation part comprises a first ventilation part body and a first ventilation hole formed in the first ventilation part body; the second ventilation component comprises a second ventilation component body correspondingly arranged above the first ventilation component and a second ventilation hole formed in the second ventilation component body; the second ventilation part body comprises a first part and a second part, and the second ventilation holes are at least formed in the first part; the range hood at least can be in the following first state and second state: in the first state, the first part of the second ventilation component body is close to the first ventilation component body of the first ventilation component, and in the second state, the first ventilation component is separated from the second ventilation component; the second part protrudes in the direction away from the first ventilation component relative to the first part.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil fume purification device, in particular to an oil fume extractor. BACKGROUND

[0002] The oil fume extractor has become one of the indispensable kitchen household appliances in modern families. The oil fume extractor works by using the principle of fluid dynamics, and uses a filter screen to filter part of the oil particles. The fan system is usually a centrifugal fan, which includes a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction force is generated at the center of the fan, which sucks the oil fume below the oil fume extractor into the fan, and then accelerates the oil fume to be collected and guided by the volute and discharged outdoors.

[0003] The traditional top suction type oil fume extractor has a large size of the smoke collecting hood, and the front and rear sizes are too large to meet the needs of the cabinet, and the user is easy to hit the head during use. The thickness size is too large, which makes the oil fume extractor appear heavy and occupy too much space in the cooking area.

[0004] Therefore, the applicant designs a lifting type thin oil fume extractor. Referring to the oil fume extractor disclosed in Chinese Patent No. 202010404880.4, the oil fume extractor includes a movable component, a fixed component, and a movement mechanism for electrically driving the movable component to lift relative to the fixed component. The movable component includes a smoke collecting hood, and the fixed component includes a fan frame.

[0005] The change of the working mode of the oil fume extractor can achieve good oil fume suction effect when working (close to the smoke source after descending) and simple and beautiful when turned off. The top suction type oil fume extractor is usually provided with two layers of filter screens. Referring to the drawings of the above-mentioned patent, Figure 4 As shown, however, this way cannot meet the needs of the oil path and air volume at the same time:

[0006] 1. Oil path: the two layers of filter screens need to be staggered, and the vertical projection of the two layers of filter screens can close the air inlet, and the distance between the two layers of screens cannot be too far.

[0007] 2. Air volume: to meet the performance of large air volume and noise, it is necessary to ensure sufficient effective air inlet area, which requires that the mesh of the filter screen be sparse, and the distance between the two layers of filter screens be ensured.

[0008] From the above, the oil path and the air volume are contradictory to the requirements of the two-layer filter screen. Therefore, the applicant also designs a lifting type range hood, see the Chinese patent No. 202321372669.4 for a lifting type range hood, which comprises a fan frame, a range hood is installed inside the fan frame, an outer box body is installed outside the fan frame, a smoke collecting hood is installed at the bottom of the outer box body, a smoke inlet is opened on the smoke collecting hood, a first plate body is installed at the bottom of the fan frame, a second plate body is installed at the smoke inlet, in the raised state of the outer box body, the first plate body and the second plate body overlap each other to close the smoke inlet, in the lowered state of the outer box body, the first plate body and the second plate body form a smoke inlet channel.

[0009] This range hood can solve the problem of air volume demand in working state and oil path in non-working state, but when the range hood switches from non-working state to working state, the fan will produce howling due to the small distance between the two layers of mesh in the lifting starting moment, and the fan can only start after the distance between the two layers increases to a certain extent, which will cause the oil smoke to escape. SUMMARY

[0010] The technical problem to be solved by the present application is to provide a range hood that reduces the resistance at the start of operation, quickly removes oil smoke, and reduces oil smoke escape.

[0011] The technical solution adopted by the present application to solve the above technical problem is: a range hood, comprising a shell and a ventilation assembly, the ventilation assembly comprising a first ventilation component and a second ventilation component arranged in the shell, the first ventilation component comprising a first ventilation component body and a first ventilation hole opened on the first ventilation component body, the second ventilation component comprising a second ventilation component body arranged above the first ventilation component and a second ventilation hole opened on the second ventilation component body; characterized in that:

[0012] The second ventilation component body comprises a first part and a second part, and the second ventilation hole is at least opened on the first part;

[0013] One of the second ventilation component and the first ventilation component can be lifted relative to the other, and the range hood can at least be in the following first state and second state: in the first state, the first part of the second ventilation component body is close to the first ventilation component body of the first ventilation component, and in the second state, the first ventilation component and the second ventilation component are separated;

[0014] The second part is convex relative to the first part in a direction away from the first ventilation component.

[0015] Since the distance between the first ventilation component and the second ventilation component is small in the off state, when the range hood is started, the small distance between the two layers of mesh will cause the fan to produce a whistling sound. Therefore, the fan can only be started after the distance between the two layers of filter mesh reaches a certain level, and in the process, the oil fume cannot be sucked in and escapes. In the present application, the second ventilation component is formed with a raised portion, so that the second ventilation component does not completely fit with the first ventilation component. When the distance between the two layers of filter mesh is small in the off state, a large gap is formed between the raised portion of the second ventilation component and the corresponding portion of the first ventilation component, that is, the air inlet channel is expanded at the raised portion, which can reduce the air suction resistance at the moment of starting. Therefore, the fan can start working at the same time when the distance between the two layers of filter mesh is expanded, and the oil fume can be quickly sucked away.

[0016] Further, in the first state, the maximum distance between the first portion and the first ventilation component body of the first ventilation component is d1, and d1≤20mm, or d1≤15mm, or 3mm≤d1≤5mm. In this state, a narrow gap that causes whistling is formed between the second ventilation component and the first ventilation component, and the raised portion provided on the second ventilation component avoids whistling when the range hood starts working.

[0017] Further, the shell comprises a first shell, a second shell, and a smoke collecting hood provided at the bottom of the first shell, the smoke collecting hood is formed with a smoke inlet, the first shell is at least partially wrapped around the outer periphery of the second shell and at least partially located below the second shell, the first shell can be lifted relative to the second shell, the first ventilation component is provided at the smoke inlet, and the second ventilation component is provided on the second shell. The first shell that can be lifted meets the needs of smoke collection and concealment, and the first ventilation component can be lifted with the first shell without the need for a separate movement mechanism, thereby simplifying the structure.

[0018] Further, in the second state, the minimum vertical distance between the second ventilation component and the first ventilation component is h, and h>20mm, so that the range hood can form a deep air inlet channel between the first ventilation component and the second ventilation component in the oil fume suction working state of the lowered first shell, meeting the air volume requirement.

[0019] Further, the distance between the highest point of the second portion and the reference plane where the first portion is located is d2, and d2≥5mm, so as to ensure that the second portion has a sufficient raised height to meet the sufficient flow area.

[0020] Further, a fan system is further provided in the shell, and the fan system is located downstream of the second ventilation component on the oil fume flow path, the axis of the fan system extends forward and backward, and the fan system at least comprises a first suction inlet towards the rear side.

[0021] The first air inlet is formed on the second ventilation component body, and the rear end of the second part forms one side edge of the first air inlet.

[0022] Therefore, the first air inlet on the second ventilation component and the first suction inlet of the fan are matched, the protrusion can guide the airflow to the first air inlet, the direction of the protrusion matches the flow direction of the airflow, and the air suction resistance at the starting moment is further reduced; at the same time, the protrusion matches the gathering direction of the oil fume airflow with the first suction inlet of the rear fan, the fan is close to the first air inlet at the starting moment, and the oil fume gas can directly enter the main first suction inlet of the rear fan through the protrusion along the gap at the rear side of the second ventilation component, greatly shortens the oil fume path, and improves the oil fume suction efficiency.

[0023] In order to meet the safety requirements and ensure that the first air inlet has sufficient flow area, the distance between the front side edge of the first air inlet and the rear side wall of the shell is d3, and d3≤50mm.

[0024] Compared with the prior art, the advantages of the present application are that: due to the small distance between the first ventilation component and the second ventilation component in the off state, when the range hood is started, the fan will produce a howling sound due to the small distance between the two layers of mesh, so the fan can only be started after the distance between the two layers of filter screens reaches a certain degree, and in the process, the oil fume cannot be sucked in and escapes. In the present application, the second ventilation component is formed with a protruding part, so that the second ventilation component does not completely fit with the first ventilation component, so that when the distance between the two layers of filter screens is close in the off state, a large gap is formed between the protrusion of the second ventilation component and the corresponding part of the first ventilation component, that is, the air inlet channel is expanded at the protrusion, the air suction resistance at the starting moment is reduced, and the fan can start working at the same time when the distance between the two layers of filter screens is expanded, and the oil fume is quickly removed. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic view of the range hood of the first embodiment of the present application (first state);

[0026] Figure 2 It is an exploded structural schematic view of the range hood of the first embodiment of the present application;

[0027] Figure 3 It is a sectional view of the range hood of the first embodiment of the present application (first state, front-rear sectional view);

[0028] Figure 4 It is a sectional view of the range hood of the first embodiment of the present application (first state, front-rear sectional view); Figure 3

[0029] Figure 5 ​Fig. 2 is a schematic view of the second ventilation component of the range hood according to the first embodiment of the present application;

[0030] Figure 6 Fig. 3 is a sectional view (front-rear sectional plane) of the range hood according to the first embodiment of the present application;

[0031] Figure 7 Fig. 4 is a sectional view (first state, left-right sectional plane, viewed from rear to front) of the range hood according to the first embodiment of the present application;

[0032] Figure 8 Fig. 5 is a sectional view (left-right sectional plane) of the second housing, the moving mechanism, and the second ventilation component of the range hood according to the first embodiment of the present application;

[0033] Figure 9 Fig. 6 is a partial enlarged view of Figure 8 Fig. 7 is a schematic view of the range hood according to the first embodiment of the present application (second state);

[0034] Figure 10 Fig. 8 is a sectional view (second state, front-rear sectional plane) of the range hood according to the first embodiment of the present application;

[0035] Figure 11 Fig. 9 is a sectional view (first state, front-rear sectional plane, with the fan system hidden) of the range hood according to the second embodiment of the present application;

[0036] Figure 12 Fig. 10 is a schematic view of the second ventilation component of the range hood according to the second embodiment of the present application.

[0037] Figure 13 Fig. 11 is a schematic view of the second ventilation component of the range hood according to the second embodiment of the present application. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions.

[0039] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the present application can be disposed in different directions, so these orientation-indicating terms are only illustrative and should not be regarded as limiting, such as "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0040] Embodiment one

[0041] Reference Figures 1-7 An extractor hood, comprising a housing, the housing comprising a first housing 11 and a second housing 12, the first housing 11 at least partially wrapping around the outer periphery of the second housing 12, and the first housing 11 being at least partially located below the second housing 12. The second housing 12 can be fixed with an external mounting base, such as a wall, while the first housing 11 can be raised and lowered relative to the second housing 12. Both the first housing 11 and the second housing 12 are hollow structures, in fluid communication with each other, and preferably have a rectangular horizontal cross-section.

[0042] The housing further comprises a smoke collecting hood 6 arranged at the bottom of the first housing 11, the smoke collecting hood 6 forming a smoke collecting cavity 61 upwardly drawn from the bottom surface, and the smoke collecting hood 6 being formed with a smoke suction port 62 at the top of the smoke collecting cavity 61. By forming the upwardly drawn smoke collecting cavity 61, the effect of drawing smoke can be achieved, preventing the escape of oil fume when contacting the smoke collecting hood 6, and since it is upwardly drawn, it avoids being exposed at the bottom of the smoke collecting hood 6, better achieving the concealment of the rising hood.

[0043] The range hood further comprises a fan system 2 and a ventilation assembly, wherein the fan system 2 is at least partially arranged in the second housing 12, and in the embodiment, the fan system 2 is a centrifugal fan. The ventilation assembly comprises a first ventilation component 31 and a second ventilation component 32, wherein the first ventilation component 31 is arranged at the smoke suction port 62, and the second ventilation component 32 is arranged at the bottom of the second housing 12 and is connected with the bottom of the second housing 12, so as to receive the oil liquid flowing down from the inner side wall surface of the second housing 12 and the fan system 2. The second ventilation component 32 and the second housing 12 can be directly connected or indirectly connected, and can be connected inside the second housing 12 or outside the second housing 12. In order to ensure that the second ventilation component 32 can receive the oil liquid flowing down from the inner side wall surface of the second housing 12, when the connection position is located inside the second housing 12, the second ventilation component 32 or an additional connecting member is in contact with the inner side wall surface of the second housing 12; when the connection position is located outside the second housing 12, in the projection on the horizontal plane, the second ventilation component 32 or the additional connecting member at least partially covers the bottom edge of the second housing 12. In the embodiment, the front and rear sides of the second ventilation component 32 are connected to the inner side of the second housing 12, and the left and right sides are connected to the lower side of the second housing 12, as shown in Figure 4 , the connection position of the front side of the second ventilation component 32 is located at the rear side of the front side wall surface of the second housing 12, and the two are fixed by the front and rear extending screws, as shown in Figure 8 and Figure 9 , the connection position of the right side of the second ventilation component 32 is located below the right side wall surface of the second housing 12 (here, the flanges can be formed respectively), and the two are fixed by the up and down extending screws.

[0044] The first ventilation component 31 comprises a first ventilation component body 311 and first ventilation holes 312 formed on the first ventilation component body 311. In the embodiment, the first ventilation component body 311 is in a substantially flat plate shape, and the first ventilation holes 312 are long strip-shaped mesh holes and extend front-to-back, so that the first ventilation component 31 is in a grating mesh shape. The second ventilation component 32 comprises a second ventilation component body 321 and second ventilation holes 322 formed on the second ventilation component body 321. The second ventilation component body 321 is located above the first ventilation component body 311, and the second ventilation holes 322 are also long strip-shaped mesh holes and extend front-to-back. To avoid oil dripping, the first ventilation holes 312 and the second ventilation holes 322 are arranged alternately, i.e., the first ventilation holes 312 correspond to the solid portions between two adjacent second ventilation holes 322, and the second ventilation holes 322 correspond to the solid portions between two adjacent second ventilation holes 322. The second ventilation component body 321 of the second ventilation component 32 comprises a first portion 3211 and a second portion 3212. The second ventilation holes 322 are formed at least partially on the first portion 3211. In the embodiment, all the second ventilation holes 322 are formed on the first portion 3211, and the first portion 3211 is also in a substantially flat plate shape. The first ventilation component 31 and the second ventilation component 32 are both filter meshes in the embodiment, and can alternatively be plate members with holes.

[0045] The lifting of the first housing 11 can meet the requirement of gathering smoke during work and hiding during non-work. Moreover, the change of the distance between the first ventilation component 31 and the second ventilation component 32 can be realized without a separate movement mechanism, which simplifies the structure and reduces the cost.

[0046] Thus, the range hood can be in at least two states, the first state: the first shell 11 is in the highest position, at which time the first ventilation component 31 and the second ventilation component 32 are in close proximity. Here, close proximity means that the maximum distance between the first part 3211 of the second ventilation component body 321 of the second ventilation component 32 and the first ventilation component 31 is d1, and d1≤20mm, preferably d1≤15mm. The smaller d1 is, the closer the two can be in the rising state, and the more compact the structure of the entire machine in the rising state can be. The minimum value of d1 can be 0, but considering the gap in actual structural design, more preferably, 3mm≤d1≤5mm. The distance between the first part 3211 and the first ventilation component 31 is defined as the length of the perpendicular line from any point on the first part 3211 to the plane on which the first ventilation component body 311 of the first ventilation component 31 faces the second ventilation component 32 (since the first ventilation component body 311 is flat, it can be considered as a stack of parallel planes). d1 is the maximum length value of these perpendicular lines. When the range hood is turned on, the first shell 11 descends relative to the second shell 12, the distance between the first ventilation component 31 and the second ventilation component 32 gradually increases, until the first shell 11 descends to the desired position, at which time it is recorded as the second state, see Figure 10 and Figure 11 In this state, the minimum vertical distance between the second ventilation component 32 and the first ventilation component 31 is h, which is the distance between the lowest point of the second ventilation component 32 and the highest point of the first ventilation component 31 projected on the vertical plane, and h>15mm, more preferably h>20mm. Since the first ventilation holes 312 and the second ventilation holes 322 are staggered, only when h is large enough, the turning angle of the airflow from the first ventilation component 31 to the second ventilation component 32 upwards is small enough to pass through the second ventilation holes 322 more. By selecting the above h value, after the oil fume passes through the first ventilation component 31, it can make the area of at least 1 / 2 or so of the direction width of the second ventilation holes 322 as the effective area for the oil fume to pass through, to ensure the effective ventilation area between the second ventilation component 32 and the first ventilation component 31, thereby ensuring smooth air intake.

[0047] In the first state, when d1≤20mm, a narrow gap that causes whistling is formed between the second ventilation component 31 and the first ventilation component 32, for which the second part 3212 is raised in the direction away from the first ventilation component 31, that is, upward, and the air intake passage of the range hood for oil fume is expanded at the raised position, thereby reducing the air suction resistance at the moment of starting, so that the fan system 2 can start working simultaneously at the moment of the expansion of the distance between the two layers of filter screens, quickly sucking away the oil fume, avoiding the escape of oil fume at the moment of starting.

[0048] The vertical distance between the highest point of the second part 3212 and the reference plane on which the first part 3211 is located is d2, and d2≥5mm is satisfied, so as to ensure that the second part 3212 is raised high enough to satisfy sufficient flow area. In addition, in consideration of the compactness of the whole machine, it is preferable to also satisfy d2≤25mm. The above-mentioned reference plane refers to the plane on which the junction of the first part 3211 and the second part 3212 is located (the points at the junction are on the same plane).

[0049] The rear bottom of the first housing 11 is provided with an oil cup 4, and the first ventilation part 31 and the second ventilation part 32 are both gradually extended downward from front to back as a whole, so as to guide the accumulated oil stains into the oil cup 4. On the oil fume flow path, the fan system 2 is located downstream of the second ventilation part 32. The axis X of the fan system 2 extends front and back, including the first suction inlet 21 as the main suction inlet and the second suction inlet 22 as the auxiliary suction inlet.

[0050] Correspondingly, the first part 3211 is wrapped around the outer periphery of the second part 3212 on the front, left and right three sides, and the first air inlet 323 is formed on the second ventilation part body 321, and the rear end of the second part 3212 forms a side edge of the first air inlet 323, so that when air is exchanged and oil fume is sucked, the air and the oil fume can flow upward after passing through the second part 3212 and reaching the edge of the second part 3212. A third ventilation hole 324 can also be opened on the second part 3212 to increase the air inlet area through which the air and the oil fume pass when air is exchanged and oil fume is sucked. Moreover, the arrangement of the third ventilation hole 324 can make the airflow directly flow upward from the second part 3212 when entering the larger space between the first ventilation part 31 and the second ventilation part 32, reducing the energy loss caused by the turning of the airflow.

[0051] The flow area of the first air inlet 323 on the second ventilation part 32 (the area surrounded by the edge of the first air inlet 323 and the corresponding position of the lower surface of the second ventilation part 32, which can be a plane or a curved surface, and the rear edge of the first air inlet 323 is based on the line between the left and right rear ends of the first part 3211, which can be seen from the dashed line shown in Figure 5 The flow area of the first air inlet 323 on the second ventilation part 32 (the area surrounded by the edge of the first air inlet 323 and the corresponding position of the lower surface of the second ventilation part 32, which can be a plane or a curved surface, and the rear edge of the first air inlet 323 is based on the line between the left and right rear ends of the first part 3211, which can be seen from the dashed line shown in

[0052] The second part 3212 can be in the shape of arching from left and right sides to the middle, whereby the middle-arched part is configured as a ridge 3213, and the left and right sides of the ridge 3213 are configured as side parts 3214, each of which gradually slopes downward in a direction away from the ridge 3213. The distance between the ridge 3213 and the projection of the axis X of the fan system 2 on the horizontal plane in the horizontal direction is d4, and satisfies d4≤D / 2, where D is the diameter of the first suction port 21. d4 means the size of the degree of deviation of the ridge 3212 from the axis X of the fan system 2, so that d4≤D / 2 can make the ridge 3213 correspond to the range of the first suction port 21 of the fan system 2, whereby the shape of the second part 3212, i.e. arching from left and right sides to the middle, forms a cavity, so that the oil fume flow is converged from left and right sides to the middle along the second part 3212, and after convergence, it can be located in the range of the first suction port 21, i.e. the design of the second part 3212 makes the convergence direction of the oil fume match the first suction port 21 at the rear side, so as to promote the flow of the oil fume to the first suction port 21.

[0053] Thus, the first air inlet 323 and the first suction port 21 of the fan system 2 are matched, the protruding second part 3212 can guide the airflow to the first air inlet 323, and the direction of the protrusion matches the flow direction of the airflow, further reducing the air suction resistance at the start-up moment; at the same time, the second part 3212 arches from left and right sides to the middle to form a cavity, so that the convergence direction of the oil fume flow (converged from left and right sides to the middle) matches the first suction port 21 at the rear side (the conventional fan arrangement, the suction port of the fan is located at or close to the middle of the left and right sides), the first suction port 21 is relatively close to the first air inlet 323 at the start-up moment, and the oil fume gas can directly enter the first suction port 21 at the rear side along the first air inlet 323 through the second part 3212, greatly shortening the oil fume path, so that the oil fume can be quickly sucked and discharged by the fan system 2, thereby improving the oil fume suction efficiency.

[0054] The size of the second portion 3212 affects the proportion of the oil fume that is split forward and backward after reaching the second portion 3212. In the embodiment, the axis X of the fan system 2 extends forward and backward, which can be horizontal or inclined relative to the horizontal direction. The depth of the second housing 12 forward and backward is B', the vertical distance between the front end of the second portion 3212 and the projection of the rear wall of the second housing 12 on the horizontal plane is B1', and B1' / B'≥1 / 2 is satisfied. Thus, the size of the second portion 3212 is as large as possible, covering a larger range, so that a larger proportion of the oil fume rises upward through the second portion 3212 to flow upward under the guidance of the second portion 3212. Compared with the first portion 3211 with a larger inclination, the oil fume is guided by the second portion 3212, which can help to slow down the tendency to flow forward along the first portion 3211 and increase the tendency to flow backward, so as to increase the proportion of the oil fume drawn in from the rear main inlet. More preferably, the axis X of the fan system 2 extends horizontally forward and backward, and the width of the second portion 3212 can be compared with the width of the fan system 2. The width of the fan system 2 is B, the vertical distance between the front end of the second portion 3212 and the projection of the first inlet 21 on the horizontal plane is B1, and B1 / B≥2 / 3 is satisfied.

[0055] The ridge 3213 of the second portion 3212 is gradually inclined downward from front to back, and the angle between the ridge 3213 and the horizontal plane is α, the inclination angle between the first portion 3211 and the horizontal plane is β, and α<β is satisfied. Thus, the oil fume can be further split forward and backward at the second portion 3212, most of the oil fume is guided to the rear side, and the influence of the inclination on the forward guidance of the oil fume is reduced, which is beneficial to the split of most of the oil fume to the rear side and into the first inlet 21.

[0056] To meet the safety requirements, i.e., to avoid that the user or other installation, maintenance, etc. staff can contact the fan system 2 through the first air inlet 323, while ensuring that the first air inlet 323 has sufficient flow area, the distance between the front side edge of the first air inlet 323 and the rear wall of the second housing 12 is d3, and d3≤50mm is satisfied.

[0057] The second ventilation component 32 further comprises a mounting portion 325 for mounting the second ventilation component body 321 to the second housing 12, the mounting portion 325 being formed by upward extension of the rear end of the second ventilation component body 321, the bottom of the mounting portion 325 being concave upward to form a second air inlet 326, the first air inlet 323 and the second air inlet 326 being integrated and in communication. The upper edge of the second air inlet 326 is in the shape of an arch rising from the left and right sides to the middle, the vertex of the upper edge of the second air inlet 326 corresponding to the ridge 3213 in the middle of the second portion 3212 of the second ventilation component 32 (here, corresponding refers to the position in the left-right direction), the minimum distance between the vertex of the upper edge of the second air inlet 326 and the ridge 3213 of the second ventilation component 32 being d7, and similarly, to meet the requirements of safety regulations and ensure that the second air inlet 326 has sufficient flow area, d7≤50mm.

[0058] Embodiment Two

[0059] Referring to Figure 12 and Figure 13 In this embodiment, the first portion 3211 and the second portion 3212 of the second ventilation component 32 are arranged in the left-right direction with a spacing therebetween, so that the second ventilation component 32 as a whole constitutes a wave-shaped filter screen, the flat plate being the first portion 3211, which is parallel to or oppositely inclined to the first ventilation component 31, and the second portion 3212 being upwardly convex relative to the first ventilation component 31.

[0060] The "fluid communication" referred to in the present application refers to the spatial positional relationship between two components or parts (hereinafter collectively referred to as first part and second part), i.e. fluid (gas, liquid or mixture of the two) can flow or / and be transported from the first part to the second part along a flow path, which can be direct connection between the first part and the second part, or indirect connection between the first part and the second part through at least one third party, which can be a fluid passage such as a pipe, channel, conduit, flow guide, hole, groove, etc., or a chamber allowing fluid flow or a combination thereof.

Claims

1. A range hood comprising a housing and a ventilation assembly, the ventilation assembly comprising a first ventilation component (31) and a second ventilation component (32) disposed in the housing, the first ventilation component (31) comprising a first ventilation component body (311) and a first ventilation hole (312) formed in the first ventilation component body (311), the second ventilation component (32) comprising a second ventilation component body (321) disposed above the first ventilation component (31) and a second ventilation hole (322) formed in the second ventilation component body (321); characterized in that: the second ventilation component body (321) comprises a first portion (3211) and a second portion (3212), and the second ventilation hole (322) is formed at least in the first portion (3211); one of the second ventilation component (32) and the first ventilation component (31) is capable of lifting relative to the other, and the range hood is capable of at least being in a first state and a second state: in the first state, the first portion (3211) of the second ventilation component body (321) is close to the first ventilation component body (311) of the first ventilation component (31), and in the second state, the first ventilation component (31) and the second ventilation component (32) are separated; the second portion (3212) protrudes relative to the first portion (3211) in a direction away from the first ventilation component (31).

2. The hood according to claim 1, characterized in that: In the first state, the maximum distance between the first portion (3211) and the first ventilation component body (311) of the first ventilation component (31) is d1, and d1≤20mm is satisfied.

3. The hood according to claim 1, characterized in that: In the first state, the maximum distance between the first portion (3211) and the first ventilation component body (311) of the first ventilation component (31) is d1, and d1≤15mm is satisfied.

4. The hood according to claim 1, characterized in that: In the first state, the maximum distance between the first portion (3211) and the first ventilation component body (311) of the first ventilation component (31) is d1, and 3mm≤d1≤5mm is satisfied.

5. The hood according to claim 1, characterized in that: The housing comprises a first shell (11), a second shell (12), and a smoke collecting hood (6) disposed at the bottom of the first shell (11), the smoke collecting hood (6) having a smoke suction opening (62) formed thereon, the first shell (11) at least partially wrapping around the outer periphery of the second shell (12) and at least partially located below the second shell (12), the first shell (11) being capable of lifting relative to the second shell (12), the first ventilation component (31) being disposed at the smoke suction opening (62), and the second ventilation component (32) being disposed on the second shell (12).

6. The hood according to claim 5, characterized in that: In the second state, the minimum vertical distance between the second ventilation component (32) and the first ventilation component (31) is h, and h>20mm is satisfied.

7. The hood according to any one of claims 1-6, characterized in that: The distance between the highest point of the second portion (3212) and the reference plane on which the first portion (3211) is located is d2, and d2≥5mm is satisfied.

8. The hood according to any one of claims 1-6, characterized in that: A fan system (2) is further arranged in the shell, and the fan system (2) is located downstream of the second ventilation component (32) on the oil fume flow path, an axis (X) of the fan system (2) extends front-to-back, and the fan system (2) at least comprises a first suction inlet (21) facing the rear side. A first air inlet (323) is formed on the second ventilation component body (321), and a rear end of the second part (3212) forms a side edge of the first air inlet (323).

9. The hood according to claim 8, characterized in that: The spacing between the front side edge of the first air inlet (323) and the rear side wall of the shell is d3, and d3≤50mm.

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