Range hood

Abstract

The utility model discloses a range hood which comprises a shell, a fan system and a second ventilation part, the fan system and the second ventilation part are arranged in the shell, the fan system is located on the downstream of the second ventilation part on an oil smoke flowing path, and the axis of the fan system extends front and back. The fan system comprises a first suction inlet facing the rear side and a second suction inlet facing the front side, and the first suction inlet is a main suction inlet; the second ventilation component comprises a first ventilation component body, the first ventilation component body comprises a first part and a second part, the first part gradually inclines downwards from front to back, and the second part protrudes upwards relative to the first part, so that airflow can flow upwards from the edge of the second part; the front-back depth of the portion, containing the fan system, of the shell is B ', the vertical distance between the projection of the front side end of the second portion and the projection of the rear side wall of the portion, containing the fan system, of the shell on the horizontal plane is B1', and B1 ' / B' is larger than or equal to 1 / 2.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics, sucking and discharging oil fume through a fan system installed inside the range hood, and using a filter screen to filter out some oil particles.

[0003] To increase the air volume, there are already some range hoods that apply double-inlet fans. For example, a range hood disclosed in a Chinese patent with the application number 201820473413.5 includes a chassis, a volute, and an oil screen. The volute is located inside the chassis. There is a front air inlet channel formed between the front plate of the volute and the front plate of the chassis, and a rear air inlet channel formed between the rear plate of the volute and the rear plate of the chassis. The oil screen is provided with oil dripping holes, and an oil cup is installed below the oil dripping holes.

[0004] For the above-mentioned range hood, the oil screen can usually only receive the oil liquid of the fan system and guide the oil liquid downward to the oil cup. However, for guiding the oil fume to the fan system, additional components for guiding are required, thus occupying the narrow space inside the chassis. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a range hood aiming at the deficiencies of the above-mentioned existing technologies, so that the ventilation component can simultaneously play the roles of oil guiding and flow guiding to make full use of the ventilation component.

[0006] The technical solution adopted by the utility model to solve the above problems is as follows: A range hood includes a housing, a fan system arranged inside the housing, and a second ventilation component. On the oil fume flow path, the fan system is located downstream of the second ventilation component. The axis of the fan system extends forward and backward. The fan system includes a first suction port facing the rear side and a second suction port facing the front side, and the first suction port is the main suction port. It is characterized in that:

[0007] The second ventilation component includes a first ventilation component body. The first ventilation component body includes a first part and a second part. The first part gradually inclines downward from front to back, and the second part protrudes upward relative to the first part, so that air flow can flow upward from the edge of the second part;

[0008] The front-back depth of the part of the housing that accommodates the fan system is B', and the vertical distance between the front end of the second part and the rear side wall of the part of the housing that accommodates the fan system in the horizontal plane projection is B1', and B1' / B'≥1 / 2 is satisfied.

[0009] By providing a second ventilation component with a first part that extends obliquely downward from front to back, the oil can be guided backward. And by providing a second part that protrudes upward, after the oil fume rises and forms a cavity on the bottom surface of the second part, it can be diverted forward and backward therefrom. Moreover, the size of the second part affects the flow rate ratio of the oil fume flowing forward and backward after reaching the second part. Therefore, the size of the second part is made as large as possible to cover a larger range, so that when the oil fume rises, a larger proportion of the oil fume passes through the second part and flows upward under the guidance of the second part. Compared with the first part with a larger inclination degree, the oil fume is diverted by the second part, which is beneficial to slowing down the tendency to flow forward along the first part and increasing the tendency to flow backward, so as to increase the proportion of the oil fume inhaled from the main suction port at the rear side.

[0010] Preferably, the axis of the fan system extends horizontally from front to back, the width of the fan system is B, the vertical distance between the front end of the second part and the projection of the first suction port on the horizontal plane is B1, and B1 / B≥2 / 3 is satisfied.

[0011] Furthermore, the second part has a ridge and side parts located on the left and right sides of the ridge, and the side parts gradually incline downward away from the ridge;

[0012] In the horizontal plane projection, the distance between the ridge and the axis of the fan system is d4, and d4≤D / 2 is satisfied, where D is the diameter of the first suction port. The second part arches upward from both left and right sides to form a cavity, so that the converging direction of the oil fume airflow matches the first suction port at the rear side, thereby promoting the oil fume to flow toward the first suction port.

[0013] Furthermore, the second part has a ridge and side parts located on the left and right sides of the ridge, the side parts gradually incline downward away from the ridge, the ridge gradually inclines downward from front to back and the angle with the horizontal plane is α, the first part gradually inclines downward from front to back and the inclination angle with the horizontal plane is β, and α<β is satisfied. This can further promote the forward and backward diversion of the oil fume at the second part, and reduce the influence of the inclination on the forward diversion of the oil fume, which is beneficial to the diversion of most of the oil fume backward and into the first suction port.

[0014] Furthermore, ventilation holes are provided on the body of the first ventilation component. A first air inlet is formed on the body of the first ventilation component, and the rear end of the second part forms one side edge of the first air inlet. Thus, the first air inlet on the second ventilation component cooperates with the first suction port of the fan, and the protrusion can guide the airflow toward the first air inlet, and the protrusion direction matches the airflow direction, further reducing the suction resistance at the moment of starting.

[0015] Further, the second part has a ridge portion and side portions located on the left and right sides of the ridge portion. The side portions gradually slope downward away from the ridge portion, and the ridge portion slopes upward gradually from front to back or extends horizontally from front to back. Thus, the shape of the second part makes the converging direction of the oil fume airflow match the first suction inlet of the fan at the rear side. The oil fume gas can directly enter the main first suction inlet of the fan at the rear side through the protrusion along the notch at the rear side of the second ventilation component, greatly shortening the oil fume path and improving the oil fume suction efficiency. Moreover, the inclination angle of the ridge portion of the second part is smaller or even slopes upward from front to back, better slowing down the tendency to flow forward along the first part and increasing the tendency to flow backward, so as to increase the proportion of the oil fume inhaled from the main suction inlet at the rear side.

[0016] Preferably, the value range of the angle between the ridge portion and the horizontal plane is [0°, 65°].

[0017] Further, to better guide most of the oil fume to flow backward, the width of the second part in the left-right direction gradually increases from front to back.

[0018] Further, the range hood further includes a first ventilation component. Along the oil fume flow path, the first ventilation component is arranged upstream of the second ventilation component, and one of the second ventilation component and the first ventilation component can move up and down relative to the other, thereby reducing the resistance during air intake and increasing the air intake area.

[0019] Further, the housing includes a first housing, a second housing, and a smoke collecting hood arranged at the bottom of the first housing. A smoke suction port is formed on the smoke collecting hood. At least part of the first housing covers the outer periphery of the second housing and is at least partly located below the second housing. The first housing can move up and down relative to the second housing. The first ventilation component is arranged at the smoke suction port, and the second ventilation component is arranged on the second housing. Thus, there is no need to set an additional driving mechanism to drive the relative movement of the filter screen, and the structure is simple.

[0020] Compared with the prior art, the advantages of the present utility model are as follows: By arranging the second ventilation component, its first part extending obliquely downward from front to back can guide the oil liquid backward. And by arranging the second part with an upward protrusion, after the oil fume rises to the cavity formed by the bottom surface of the second part, it can be diverted forward and backward. Moreover, the size of the second part affects the flow rate ratio of the oil fume flowing forward and backward after reaching the second part. Therefore, the size of the second part is made as large as possible to cover a larger range, so that when the oil fume rises, a larger proportion of the oil fume passes through the second part and flows upward under the guidance of the second part. Compared with the first part with a larger inclination degree, the oil fume is diverted by the second part, which is beneficial to slowing down the tendency to flow forward along the first part and increasing the tendency to flow backward, so as to increase the proportion of the oil fume inhaled from the main suction inlet at the rear side. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the range hood according to an embodiment of the present utility model (first state);

[0022] Figure 2 Exploded structural schematic diagram of the range hood according to an embodiment of the present utility model;

[0023] Figure 3 Cross-sectional view of the range hood according to an embodiment of the present utility model (first state, front-to-back cross-section);

[0024] Figure 4 is Figure 3 Enlarged schematic diagram of partial view Ⅰ;

[0025] Figure 5 Schematic diagram of the second ventilation component of the range hood according to an embodiment of the present utility model;

[0026] Figure 6 Cross-sectional view of the second ventilation component of the range hood according to an embodiment of the present utility model (front-to-back cross-section);

[0027] Figure 7 Cross-sectional view of the range hood according to an embodiment of the present utility model (first state, left-to-right cross-section, viewed from the back to the front);

[0028] Figure 8 Cross-sectional view of the second housing, motion mechanism and second ventilation component of the range hood according to an embodiment of the present utility model (left-to-right cross-section);

[0029] Figure 9 is Figure 8 Enlarged schematic diagram of partial view Ⅱ;

[0030] Figure 10 Schematic diagram of the range hood according to an embodiment of the present utility model (second state);

[0031] Figure 11 Cross-sectional view of the range hood according to an embodiment of the present utility model (second state, front-to-back cross-section). Detailed implementation manners

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0033] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the disclosed embodiments of the present utility model can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0034] See Figures 1 to 7 , an oil fume extractor, comprising a housing, the housing including a first housing 11 and a second housing 12. The first housing 11 at least partially wraps around the outer periphery of the second housing 12, and the first housing 11 is at least partially located below the second housing 12. The second housing 12 can be fixed to an external installation base, such as a wall, while the first housing 11 can be lifted and lowered relative to the second housing 12. Both the first housing 11 and the second housing 12 are hollow structures, fluidly connected to each other, and preferably, their horizontal cross-sections can both be rectangular.

[0035] The housing further includes a smoke collecting hood 6 provided at the bottom of the first housing 11. A smoke collecting cavity 61 that bulges upward from the bottom surface is formed inside the smoke collecting hood 6. A smoke suction port 62 is formed at the top of the smoke collecting hood 6 where the smoke collecting cavity 61 is located. By forming the upward-bulging smoke collecting cavity 61, the function of collecting smoke can be achieved, preventing the oil fume from escaping when contacting the smoke collecting hood 6. Moreover, since it bulges upward and avoids being exposed at the bottom of the smoke collecting hood 6, the concealment of the lifting type range hood can be better realized.

[0036] The range hood further includes a fan system 2 and a ventilation component. The fan system 2 is at least partially disposed within the second housing 12. In this embodiment, the fan system 2 is a centrifugal fan. The ventilation component includes a first ventilation member 31 and a second ventilation member 32. The first ventilation member 31 is disposed at the smoke suction opening 62, while the second ventilation member 32 is disposed at the bottom of the second housing 12. Preferably, the second ventilation member 32 covers the edge of the bottom of the second housing 12 and is connected to the bottom of the second housing 12, so as to receive the oil flowing down from the inner side wall surface of the second housing 12 and the fan system 2. The second ventilation member 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. To ensure that the second ventilation member 32 can receive the oil flowing down from the inner side wall surface of the second housing 12, when the connection position is inside the second housing 12, the second ventilation member 32 or an additional connecting member contacts the inner side wall surface of the second housing 12; when the connection position is outside the second housing 12, in the horizontal plane projection, the second ventilation member 32 or an additional connecting member at least partially covers the bottom edge of the second housing 12. In this embodiment, the front and rear sides of the second ventilation member 32 are connected to the inside of the second housing 12, while the left and right sides are connected to the lower side of the second housing 12. Refer to Figure 4 , the connection at the front side of the second ventilation member 32 is located at the rear side of the front side wall surface of the second housing 12, and the two can be fixed by screws extending in the front-rear direction. Refer to Figure 8 and Figure 9 , the connection at the right side of the second ventilation member 32 is located below the right side wall surface of the second housing 12 (flanges can be formed here respectively), and the two can be fixed by screws extending in the up-down direction.

[0037] The first ventilation component 31 includes a second ventilation component body 311 and a second ventilation hole 312 formed in the second ventilation component body 311. In this embodiment, the second ventilation component body 311 is substantially in the shape of a flat plate, and the second ventilation hole 312 is a strip-shaped ventilation hole and extends in the front-rear direction, so that the first ventilation component 31 is configured as a grille mesh. The second ventilation component 32 includes a first ventilation component body 321 and a first ventilation hole 322 formed in the first ventilation component body 321. The first ventilation component body 321 is correspondingly located above the second ventilation component body 311, and the first ventilation hole 322 is also a strip-shaped ventilation hole and extends in the front-rear direction. To avoid oil dripping, the second ventilation hole 312 and the first ventilation hole 322 are arranged in a staggered manner, that is, the second ventilation hole 312 corresponds to the solid part between two adjacent first ventilation holes 322, and the first ventilation hole 322 corresponds to the solid part between two adjacent first ventilation holes 322. The first ventilation component body 321 of the second ventilation component 32 includes a first part 3211 and a second part 3212. The above-mentioned first ventilation hole 322 is formed in the first part 3211, and the first part 3211 is also substantially in the shape of a flat plate. The first ventilation component 31 and the second ventilation component 32 are both filter meshes in this embodiment, and alternatively, they can also be formed by perforating a plate member.

[0038] The lifting of the first housing 11 can meet the requirements of collecting smoke during work and hiding when not working. Moreover, through the above structure, the change in the distance between the first ventilation component 31 and the second ventilation component 32 can be realized without separately arranging a motion mechanism, which simplifies the structure and reduces the cost.

[0039] Thus, the range hood can be at least in two states. The first state: the first housing 11 is at the highest position, and at this time, the first ventilation component 31 and the second ventilation component 32 are in a close state. Here, the close state means that the maximum distance between the first part 3211 of the first ventilation component body 321 of the second ventilation component 32 and the first ventilation component 31 is d1, and d1 ≤ 20 mm is satisfied, preferably d1 ≤ 15 mm. The smaller d1 is, the closer the two can be attached when rising, and the overall structure of the rising state can be more compact. The minimum value of d1 can be 0, but considering the actual structural design gap, more preferably, 3 mm ≤ d1 ≤ 5 mm. The distance between the first part 3211 and the first ventilation component 31 is defined as the perpendicular length from any point on the first part 3211 to the plane where the second ventilation component body 311 of the first ventilation component 31 faces the second ventilation component 32 (since the second ventilation component body 311 is flat, it can be regarded as composed of multiple parallel planes stacked), and d1 is the maximum value of these perpendicular lengths. When the range hood is turned on, the first housing 11 descends relative to the second housing 12, and the distance between the first ventilation component 31 and the second ventilation component 32 gradually increases until the first housing 11 descends to the required position, and this is recorded as the second state at this time. 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, and this distance is the distance between the lowest point of the second ventilation component 32 and the projection of the highest point of the first ventilation component 31 on the vertical plane, and h > 15 mm is satisfied, more preferably h > 20 mm. Since the second ventilation hole 312 and the first ventilation hole 322 of the ventilation hole are staggered, only when h is large enough can the turning angle of the air flow from the first ventilation component 31 to the second ventilation component 32 upward be small enough, so as to pass through the first ventilation hole 322 of the ventilation hole more. By selecting the above h value, after the cooking fume passes through the first ventilation component 31, in the case where the turning angle is less than 30°, at least about 1 / 2 of the direction width area of the first ventilation hole 322 of the ventilation hole can be used as an effective area for the cooking fume to pass through, so as to ensure the effective ventilation area between the second ventilation component 32 and the first ventilation component 31, thereby ensuring smooth air intake.

[0040] In the first state, when d1 ≤ 20 mm, if the filter screen structure with both layers of nets being flat as disclosed in the background art is adopted, then on the premise of ensuring that the noise level meets the experience comfort level, the flow rate < 6 m 3 / min. When d1 ≤ 15 mm, the flow rate < 5 3 / min. It can be seen that the air flow is restricted at this time, which will prevent normal ventilation or greatly extend the ventilation time, resulting in abnormal ventilation function. Therefore, the second part 3212 protrudes upward relative to the first part 3211 in a direction away from the first ventilation component 31, that is, upward, so that there is a part with a larger distance between the second ventilation component 32 and the first ventilation component 31, providing space for air circulation. When the air flow enters this space with a larger distance, it does not need to turn suddenly as in other parts, but can smoothly turn and flow upward from the second part 3212 or from the edge of the second part 3212, greatly reducing the air flow resistance, thereby ensuring the normal realization of the ventilation function and keeping the air in the kitchen clean.

[0041] In addition, by providing the protruding second part 3212 on the second ventilation component 32, the air inlet passage for the oil fume of the range hood in the first state is enlarged at the protruding position, thereby reducing the suction resistance at the moment of starting up. Thus, when the distance between the two filter screens is enlarged, the fan system 2 can start working synchronously to quickly suck out the oil fume and avoid the escape of oil fume at the moment of starting up.

[0042] The vertical distance between the highest point of the second part 3212 and the reference plane where the first part 3211 is located is d2, and d2≥5mm is satisfied to ensure that the second part 3212 protrudes to a sufficient height to meet the sufficient cross-sectional area for flow. In addition, considering the compactness of the whole machine, preferably d2≤25mm is also satisfied. The above-mentioned reference plane refers to the plane where the junction of the first part 3211 and the second part 3212 is located (all points at the junction are on the same plane).

[0043] An oil cup 4 is provided at the bottom of the rear side of the first housing 11. The first ventilation component 31 and the second ventilation component 32 as a whole gradually extend downward from front to back, so as to guide the accumulated oil stains into the oil cup 4. In the oil fume flow path, the fan system 2 is located downstream of the second ventilation component 32. The axis X of the fan system 2 extends back and forth, including a first suction port 21 as the main suction port and a second suction port 22 as the auxiliary suction port.

[0044] Accordingly, the first part 3211 wraps around the outer periphery of the second part 3212 on the front, left, and right sides. A first air inlet 323 is formed on the first ventilation component body 321. The rear side end of the second part 3212 forms one side edge of the first air inlet 323. Thus, when ventilating, air and when sucking cooking fumes, the fumes can flow upward along the edge of the second part 3212 after passing through the second part 3212. Third ventilation holes 324 can also be opened on the second part 3212 to increase the air inlet area through which air passes when ventilating and cooking fumes pass when sucking cooking fumes. Moreover, the setting of the third ventilation holes 324 enables the air flow to directly flow upward from the second part 3212 when entering the relatively large space between the first ventilation component 31 and the second ventilation component 32, reducing the energy loss caused by the air flow turning.

[0045] The flow-through area of the first air inlet 323 on the second ventilation component 32 (the area enclosed by the edge of the first air inlet 323 and the corresponding position on the lower surface of the second ventilation component 32, which can be a plane or a curved surface. The rear side edge of the first air inlet 323 is based on the connection line between the left and right rear ends of the first part 3211. See the dashed line shown in Figure 5 is s1, and the flow-through area of the first suction port 21 of the fan system 2 (the area enclosed by the edge of the first suction port 21, usually the area enclosed by the air inlet circle on the volute of the fan system 2. The air inlet circle is the same as the prior art and is not marked in the figure) is s2, and s1 / s2≥30% is satisfied to ensure sufficient ventilation flow rate. When the option of opening the third ventilation holes 324 is selected, the total flow-through area of the first air inlet 323 and the third ventilation holes 324 on the second ventilation component 32 is s3, and s3 / s2≥35% is satisfied.

[0046] The second part 3212 can be in a shape that arches from the left and right sides towards the middle. Thus, the arched part in the middle constitutes the ridge part 3213, and the left and right sides of the ridge part 3213 constitute the side parts 3214. Each side part 3214 gradually slopes downward away from the ridge part 3213. The distance in the horizontal direction between the projection of the ridge part 3213 and the axis X of the fan system 2 on the horizontal plane is d4, and d4≤D / 2 is satisfied, where D is the diameter of the first suction port 21. d4 represents the degree of deviation between the ridge part 3212 and the axis X of the fan system 2. Therefore, satisfying d4≤D / 2 enables the ridge part 3213 to be within the range corresponding to the first suction port 21 of the fan system 2. Thus, the shape adopted by the second part 3212, that is, arching from the left and right sides towards the middle to form a cavity, enables the oil fume airflow to converge from the left and right sides towards the middle along the second part 3212. After convergence, it can be within the range of the first suction port 21. That is, the design of the second part 3212 makes the oil fume convergence direction match the first suction port 21 at the rear to promote the oil fume to flow towards the first suction port 21.

[0047] Thus, the first air inlet 323 cooperates with the first suction port 21 of the fan system 2. The protruding second part 3212 can guide the airflow towards the first air inlet 323, and the protruding direction matches the airflow direction, further reducing the suction resistance at the moment of startup. At the same time, the second part 3212 arches towards the middle from both left and right sides to form a cavity, making the converging direction of the oil fume airflow (converging from both left and right sides to the middle) match the first suction port 21 at the rear (in a conventional fan arrangement, the suction port of the fan is located in the middle or near the middle of both left and right sides). At the moment of startup, the distance between the first suction port 21 and the first air inlet 323 is relatively close, and the oil fume gas can directly enter the first suction port 21 at the rear along the first air inlet 323 through the second part 3212, greatly shortening the oil fume path, enabling the oil fume to be quickly sucked in and discharged by the fan system 2, thereby improving the oil fume suction efficiency.

[0048] The size of the second part 3212 affects the flow rate ratio of the oil fume flowing forward and backward after reaching the second part 3212. In this embodiment, if the axis X of the fan system 2 extends forward and backward, it can be horizontal or inclined relative to the horizontal direction. The depth of the second housing 12 from front to back is B', and the vertical distance between the front end of the second part 3212 and the rear side wall of the second housing 12 in the horizontal plane projection is B1', and it satisfies B1' / B'≥1 / 2. This makes the size of the second part 3212 as large as possible to cover a larger range. When the oil fume rises, a larger proportion of the oil fume passes through the second part 3212, and under the guidance of the second part 3212, it flows upward. Compared with the first part 3211 with a larger inclination degree, the oil fume is diverted by the second part 3212, which is beneficial to slowing down the tendency of flowing forward along the first part 3211 and increasing the tendency of flowing backward, so as to increase the proportion of the oil fume inhaled from the main suction port at the rear. More preferably, the axis X of the fan system 2 extends horizontally from front to back. At this time, the width of the second part 3212 can be compared with that of the fan system 2. The width of the fan system 2 is B, and the vertical distance between the front end of the second part 3212 and the projection of the first suction port 21 in the horizontal plane is B1, and it satisfies B1 / B≥2 / 3.

[0049] The ridge 3213 of the second part 3212 gradually slopes downward from front to back, and the angle with the horizontal plane is α. The inclination angle between the first part 3211 and the horizontal plane is β, and it satisfies α<β. This can further promote the forward and backward diversion of the oil fume at the second part 3212, guide most of the oil fume to the rear side, and reduce the influence of the inclination on the forward diversion of the oil fume, which is beneficial to the diversion of most of the oil fume to the rear side and into the first suction port 21.

[0050] To meet the safety requirements, that is, to prevent users or other installation, maintenance, and other staff from contacting the fan system 2 through the first air inlet 323, and at the same time ensure that the first air inlet 323 has a sufficient flow area, the distance between the front side edge of the first air inlet 323 and the rear side wall of the second housing 12 is d3, and d3 ≤ 50 mm is satisfied.

[0051] The second ventilation component 32 further includes an installation portion 325 for installing the first ventilation component body 321 to the second housing 12. The installation portion 325 is formed by extending upward from the rear end of the first ventilation component body 321. The bottom of the installation portion 325 is recessed upward to form a second air inlet 326. The first air inlet 323 and the second air inlet 326 are connected and integrated. The upper edge of the second air inlet 326 is arched from the left and right sides to the middle. The vertex of the upper edge of the second air inlet 326 corresponds to the ridge 3213 in the middle of the second part 3212 of the second ventilation component 32 (here, "corresponds" means the position correspondence 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 is d7. Similarly, to meet the safety requirements and ensure that the second air inlet 326 has a sufficient flow area, d7 ≤ 50 mm.

[0052] As used in the present utility model, "fluid communication" refers to the spatial position relationship between two components or parts (hereinafter uniformly referred to as the first part and the second part respectively), that is, fluid (gas, liquid, or a mixture of both) can flow or / and be transported from the first part along a flow path to the second part. It can be that the first part and the second part are directly connected, or the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, a passage, a conduit, a flow guide, a hole, a groove, etc., or a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising a housing, a fan system (2) arranged in the housing, and a second ventilation component (32), wherein the fan system (2) is located downstream of the second ventilation component (32) on the flow path of oil smoke, an axis (X) of the fan system (2) extends forward and backward, the fan system (2) comprises a first suction port (21) facing the rear side and a second suction port (22) facing the front side, the first suction port (21) being a main suction port; and characterized in that: The second ventilation component (32) comprises a first ventilation component body (321), the first ventilation component body (321) comprises a first part (3211) and a second part (3212), the first part (3211) gradually tilts downward from front to back, and the second part (3212) protrudes upward relative to the first part (3211), so that airflow can flow upward from the edge of the second part (3212); The front-to-rear depth of the portion of the casing accommodating the fan system (2) is B', the vertical distance between the front end of the second portion (3212) and the projection of the rear side wall of the portion of the casing accommodating the fan system (2) on the horizontal plane is B1', and B1' / B'≥1 / 2 is satisfied.

2. The range hood according to claim 1, characterized in that: The axis (X) of the fan system (2) extends horizontally front to back, the width of the fan system (2) is B, the vertical distance between the front end of the second part (3212) and the projection of the first suction port (21) on the horizontal plane is B1, and B1 / B≥2 / 3 is satisfied.

3. The range hood according to claim 2, characterized in that: The second portion (3212) has a ridge (3213) and side portions (3214) located on the left and right sides of the ridge (3213), and the side portions (3214) gradually incline downward in a direction away from the ridge (3213); In horizontal plane projection, the distance between the ridge (3213) and the axis (X) of the fan system (2) is d4, and satisfies d4≤D / 2, where D is the diameter of the first suction port (21).

4. The range hood according to claim 2, characterized in that: The second part (3212) has a ridge (3213) and side parts (3214) located on the left and right sides of the ridge (3213), the side parts (3214) gradually tilt downward in the direction away from the ridge (3213), the ridge (3213) gradually tilts downward from front to back and the angle between it and the horizontal plane is α, the first part (3211) gradually tilts downward from front to back and the angle between it and the horizontal plane is β, and α<β is satisfied.

5. The range hood according to any one of claims 1 to 4, characterized in that: A first ventilation hole (322) is provided on the first ventilation component body (321), a first air inlet (323) is formed on the first ventilation component body (321), and a rear end portion of the second portion (3212) forms a side edge of the first air inlet (323).

6. The range hood according to claim 1, characterized in that: The second part (3212) has a ridge (3213) and side portions (3214) located on the left and right sides of the ridge (3213), and the side portions (3214) gradually tilt downward in a direction away from the ridge (3213), and the ridge (3213) gradually tilts upward from front to back or extends horizontally from front to back.

7. The range hood according to claim 6, characterized in that: The angle between the ridge (3213) and the horizontal plane ranges from [0° to 65°].

8. The range hood according to claim 1, characterized in that: The width of the second portion (3212) in the left-right direction gradually increases from front to back.

9. The range hood according to any one of claims 1 to 4, characterized in that: The range hood further comprises a first ventilation component (31), which is arranged upstream of a second ventilation component (32) along the flow path of the oil smoke, and one of the second ventilation component (32) and the first ventilation component (31) can be raised or lowered relative to the other.

10. The range hood according to claim 9, characterized in that: The shell comprises a first shell (11), a second shell (12) and a smoke collecting hood (6) arranged at the bottom of the first shell (11); a smoke outlet (62) is formed on the smoke collecting hood (6); the first shell (11) at least partially covers the outer periphery of the second shell (12) and is at least partially located below the second shell (12); the first shell (11) can be raised and lowered relative to the second shell (12); the first ventilation component (31) is arranged at the smoke outlet (62); and the second ventilation component (32) is arranged on the second shell (12).

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