Range hood

Abstract

The utility model discloses a range hood which comprises a shell and a fan system arranged in the shell, a first ventilation part is arranged below the fan system, the fan system comprises a volute, and an oil dripping nozzle is arranged at the lowest position of the volute; the portion, corresponding to the position of the oil dripping nozzle, of the first ventilation component is closed, and the vertical distance between the oil dripping nozzle and the first ventilation component is c which is larger than or equal to 8 mm. Compared with the prior art, the oil dripping device has the advantages that the distance between the first ventilation component and the oil dripping nozzle meets a certain requirement, so that splashing of oil dripped to the first ventilation component is reduced, and the oil dripped from a fan can be better received.

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. They suck and exhaust oil fumes through a fan system installed inside the range hood and use a filter screen to filter some oil particles. The fan system is usually a centrifugal fan, including a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, sucking the oil fumes below the range hood into the fan. After being accelerated by the fan, the oil fumes are collected by the volute and guided out of the room.

[0003] For the existing top-mounted range hoods, in order to facilitate the collection of the oil droplets dripping from the fan system, a first ventilation component is arranged below the fan system. For example, a filter device for a range hood disclosed in a Chinese patent with the application number 201720190947.2 includes an air cabinet. A filter screen is arranged inside the air cabinet. The filter screen is divided into an outer net and an inner net. There is a gap between the outer net and the inner net, and they are separated from each other. The outer net is recessed into the air cabinet, and the inner net is located on one side of the outer net relative to the air cabinet. The inner net is inclined in the air cabinet. Another example is a range hood with an open three-dimensional mesh filter disclosed in a Chinese patent with the application number 201920307416.6, which includes a housing, a box body, a fan, a glass panel, an oil net and an oil cup. It also includes a partition board and an open three-dimensional mesh filter plate (equivalent to the inner oil net of this application). The partition board is provided with smoke guiding holes. The rear end of the partition board extends into the housing through the connection between the box body and the housing and is connected to the rear backboard of the housing, and the front end extends into the box body and is connected to the front wall board of the front box body. The open three-dimensional mesh filter plate covers the smoke guiding holes and is detachably connected to the partition board.

[0004] Since the pressure inside the volute is positive, high-speed airflows will spray outwards from the oil leakage holes at the bottom of the volute. In this case, if the distance between the first ventilation component and the oil leakage holes is too close, the oil droplets will splash laterally after dropping onto the first ventilation component. Since there are openings on the first ventilation component and it cannot block the splashing oil laterally, the first ventilation component will not be able to play the role of collecting the oil dripping from the fan. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a range hood that facilitates the first ventilation component to collect the oil droplets dripping from the fan system in view of the deficiencies of the above-mentioned existing technologies.

[0006] The utility model solves the above technical problems by adopting the following technical solution: a range hood, comprising a housing and a fan system arranged in the housing, a first ventilation component is arranged below the fan system, the fan system comprises a volute, and an oil drip nozzle is arranged at the lowest position of the volute; the characteristics are:

[0007] The portion corresponding to the position of the first ventilation component and the oil drip nozzle is in a closed state, and the vertical distance between the oil drip nozzle and the first ventilation component is c, and c≥8mm.

[0008] Since there is positive pressure inside the volute, a high-speed airflow will be ejected from the volute to the outside at the oil drip nozzle at the bottom of the volute. In this case, if the first ventilation component and the oil leakage hole are too close, the oil will drip onto the first ventilation component and splash laterally. Since there are openings on the first ventilation component and the splashing oil cannot be blocked laterally, the first ventilation component will not be able to receive the oil dripping from the fan. Therefore, the distance between the first ventilation component and the oil drip nozzle meets certain requirements to reduce the splashing of the oil after dripping onto the first ventilation component, so as to better receive the oil dripping from the fan.

[0009] Preferably, the first ventilation component includes a first ventilation component body located below the fan system, the above c is a vertical distance between the oil drip nozzle and the first ventilation component body, the width of the oil drip nozzle is d12, and the minimum closed area of ​​the first ventilation component body and the corresponding part of the oil drip nozzle position of the first ventilation component is π(d12 / 2+ctanγ) 2 , γ is the angle between the line between any point on the edge of the oil drip nozzle and any point on the main body of the first ventilation component and the vertical direction, and satisfies γ≥30°.

[0010] To prevent oil from splashing from the front side, the first ventilation component includes a first ventilation component body located below the fan system and a second mounting portion bent upward from the front side of the first ventilation component body. The above-mentioned c is the vertical distance between the oil drip nozzle and the first ventilation component body, and the second mounting portion is closed at a position corresponding to the front side of the oil drip nozzle.

[0011] To further prevent oil from splashing from the front side, the upper end of the second mounting portion at the closed position is not lower than the lower end of the oil drip nozzle.

[0012] Furthermore, the axis X of the fan system extends in the front-to-back direction, a first ventilation hole is provided on the first ventilation component body, and a fourth ventilation hole is provided on the second mounting portion, thereby enabling bottom and front air intake and increasing the air intake area.

[0013] Furthermore, the fan system includes a first suction inlet facing the rear side as a main suction inlet and a second suction inlet facing the front side as an auxiliary suction inlet. The flow area of ​​the first ventilation hole of the first ventilation component is larger than the flow area of ​​the fourth ventilation hole, thereby allowing most of the oil smoke to flow to the main suction inlet on the rear side.

[0014] To facilitate the collection of oil on the first ventilation component, the first ventilation component includes a first ventilation component body located below the fan system. The above-mentioned c is the vertical distance between the oil drip nozzle and the first ventilation component body. The first ventilation component body gradually tilts downward from the position corresponding to the oil drip nozzle, and an oil cup is provided on the bottom rear side of the outer shell.

[0015] In order to prevent the oil from being blown up and splashed by the fan system at the maximum wind speed in the middle, the main body of the first ventilation component includes a first part and a second part that protrudes upward relative to the first part, and the oil drip nozzle is located above the second part. The second part as a whole is in a shape that arches upward from the left and right sides to the middle, and the left and right sides of the second part gradually tilt downward from front to back, and the distance between the left and right sides of the second part gradually increases from front to back.

[0016] In order to facilitate the downward guidance and collection of the oil on the first ventilation component, the fan system includes a first suction port facing the rear side, and a first oil leakage hole is opened at the rear end of the first ventilation component, and the first oil leakage hole corresponds to the left and right sides of the second part.

[0017] Furthermore, the outer shell includes a first shell and a second shell, the first shell at least partially covers the outer periphery of the second shell and is at least partially located below the second shell, the fan system is arranged in the second shell, and the first ventilation component is arranged at the bottom of the second shell or in the second shell.

[0018] Furthermore, the first ventilation component is arranged at the bottom of the second shell, and the projection of the edge of the first ventilation component on the horizontal plane covers the projection of the edge of the second shell on the horizontal plane, thereby allowing the first ventilation component to collect oil on the wall of the second shell.

[0019] Compared with the prior art, the utility model has the following advantages: since there is positive pressure inside the volute, a high-speed airflow will be ejected from the volute to the outside at the oil drip nozzle at the bottom of the volute. In this case, if the first ventilation component and the oil leakage hole are too close, the oil will drip onto the first ventilation component and then splash laterally. Since there are openings on the first ventilation component and the splashing oil cannot be blocked laterally, the first ventilation component will not be able to receive the oil dripping from the fan. Therefore, the distance between the first ventilation component and the oil drip nozzle meets certain requirements to reduce the splashing of the oil after dripping onto the first ventilation component, so as to better receive the oil dripping from the fan. Brief Description of the Drawings

[0020] Figure 1 Schematic diagram of the range hood according to an embodiment of the present utility model (first state);

[0021] Figure 2 Exploded structural schematic diagram of the range hood according to an embodiment of the present utility model;

[0022] 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);

[0023] Figure 4 For Figure 3 Partial enlarged schematic view of I;

[0024] Figure 5 Schematic diagram of the first ventilation component of the range hood according to an embodiment of the present utility model;

[0025] Figure 6 Cross-sectional view of the first ventilation component of the range hood according to an embodiment of the present utility model (front-to-back cross-section);

[0026] 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);

[0027] Figure 8 Schematic diagram of the range hood according to an embodiment of the present utility model with parts of the second housing, the first housing, the second ventilation component, and the oil cup hidden;

[0028] Figure 9 Cross-sectional view of the second housing, the movement mechanism, and the second ventilation component of the range hood according to an embodiment of the present utility model (left-to-right cross-section);

[0029] Figure 10 For Figure 9 Partial enlarged schematic view of II;

[0030] Figure 11 Schematic diagram of the range hood according to an embodiment of the present utility model (second state);

[0031] Figure 12 Cross-sectional view of the range hood according to an embodiment of the present utility model (second state, front-to-back cross-section);

[0032] Figure 13 For Figure 12 Partial enlarged schematic view of III. Detailed Description of the Invention

[0033] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where like or similar reference numerals denote like or similar elements or elements having the same or similar functions.

[0034] 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, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] See Figures 1 - 8 , an oil fume extractor, which is a top-mounted oil fume extractor, including a housing. The housing includes 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 move up and down 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 have a rectangular horizontal cross-section.

[0036] The housing further includes a smoke collecting hood 6 provided at the bottom of the first housing 11. A smoke collecting cavity 61 that rises from the bottom surface is formed in 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 upwardly rising smoke collecting cavity 61, the function of collecting smoke can be achieved, preventing the oil fume from escaping when it contacts the smoke collecting hood 6. Moreover, since it rises upward and avoids being exposed at the bottom of the smoke collecting hood 6, the concealment of the lifting range hood can be better realized.

[0037] The range hood further includes a fan system 2 and a ventilation assembly. 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 assembly includes a second ventilation member 31 and a first ventilation member 32. The second ventilation member 31 is disposed at the smoke suction port 62, while the first ventilation member 32 is disposed at 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 may be directly or indirectly connected, and may be connected inside 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, and the left and right sides are connected to the lower side of the second housing 12. Refer to Figure 4 , the connection point on 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 and rear directions. Refer to Figure 9 and Figure 10 , the connection point on 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 and down directions. The first ventilation member

[0038] The second ventilation component 31 includes a second ventilation component body 311 and second ventilation holes 312 formed in the second ventilation component body 311. In this embodiment, the second ventilation component body 311 is generally in a flat plate shape, and the second ventilation holes 312 are long strip-shaped mesh holes and extend in the front-rear direction, so that the second ventilation component 31 is configured as a grille mesh. The first ventilation component 32 includes a first ventilation component body 321 and first ventilation holes 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 holes 322 are also long strip-shaped mesh holes and extend in the front-rear direction. To avoid oil dripping, the second ventilation holes 312 and the first ventilation holes 322 are arranged in an interleaved manner, that is, the second ventilation holes 312 correspond to the solid parts between two adjacent first ventilation holes 322, and the first ventilation holes 322 correspond to the solid parts between two adjacent first ventilation holes 322. The first filter screen body 321 of the first ventilation component 32 includes a first part 3211 and a second part 3212. The above-mentioned first ventilation holes 322 are formed in the first part 3211, and the first part 3211 is also generally in a flat plate shape. The first ventilation component 31 and the second ventilation component 32 are both filter screens in this embodiment, and alternatively, they can also be formed by perforating a plate member.

[0039] The length extension directions of the second ventilation holes 312 and the first ventilation holes 322 are the same. In the projection on the horizontal plane, the included angle between the length direction of the first ventilation holes 322 and the axis X of the fan system 2 is ≤ 45°. Since both the second ventilation component 31 and the first ventilation component 32 are grilles, the grille directions of the two layers of filter screens are basically the same, and the grille direction of the first ventilation component 32 can also be consistent with the air inlet direction of the fan system 2 or the included angle with the air inlet direction of the fan system 2 is small. Thus, the air flow can rise upward along a relatively stable path, reducing the large air inlet resistance caused by the path change, playing a role in air flow combing, and at the same time reducing noise.

[0040] The effective total ventilation area of the edges of each of the first ventilation holes 322 projected on the horizontal plane is ≥ 30,000 square millimeters, so as to meet the requirements of air volume, noise, and total pressure efficiency, and minimize the resistance of the first ventilation component 32 to the air flow as much as possible.

[0041] 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 second ventilation component 31 and the first ventilation component 32 can be realized without separately setting a motion mechanism, simplifying the structure and reducing the cost.

[0042] Thus, the range hood can be in at least two states. The first state: the first housing 11 is in the highest position, and at this time, the second ventilation component 31 and the first 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 first ventilation component 32 and the second 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 more compact the overall structure can be in the rising state. 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 second 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 second ventilation component 31 faces the first 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 second ventilation component 31 and the first ventilation component 32 gradually increases until the first housing 11 descends to the required position, which is recorded as the second state at this time. See Figure 11 and Figure 12 , in this state, the minimum vertical distance between the first ventilation component 32 and the second ventilation component 31 is h. This distance is the distance between the lowest point of the first ventilation component 32 and the highest point of the second ventilation component 31 projected on the vertical plane, and h > 15 mm is satisfied. More preferably, h > 20 mm. Since the second ventilation holes 312 and the first ventilation holes 322 are staggered, only when h is large enough can the turning angle of the air flow from the second ventilation component 31 to the upward flow of the first ventilation component 32 be small enough, so that more air can pass through the first ventilation holes 322. By selecting the above h value, after the cooking fumes pass through the second 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 holes 322 can be used as the effective area for the cooking fumes to pass through, so as to ensure the effective ventilation area between the first ventilation component 32 and the second ventilation component 31, thereby ensuring smooth air intake.

[0043] 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 flow rate 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 away from the second ventilation component 31 relative to the first part 3211, that is, protrudes upward, so that there is a part with a larger spacing between the first ventilation component 32 and the second ventilation component 31, providing space for air circulation. When the air flow enters this space with a larger spacing, 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.

[0044] In addition, by providing the protruding second part 3212 on the first 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 spacing between the two layers of filters 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.

[0045] 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 it satisfies d2≥5mm, so as to ensure that the second part 3212 protrudes to a sufficient height to meet the sufficient flow area. In addition, considering the compactness of the whole machine, it is preferably also satisfied that d2≤25mm. 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).

[0046] An oil cup 4 is provided at the bottom of the rear side of the first housing 11. The second ventilation component 31 and the first 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 first ventilation component 32. The axis X of the fan system 2 extends back and forth, including a first suction port 21 serving as the main suction port and a second suction port 22 serving as the auxiliary suction port. The first suction port 21 faces backward, which can reduce the aerodynamic noise of the fan system 2 away from the human ear.

[0047] 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 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 provided on the second part 3212 to increase the air inlet area through which air passes during ventilation and cooking fumes pass during sucking cooking fumes. Moreover, the arrangement 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 second ventilation component 31 and the first ventilation component 32, reducing the energy loss caused by the air flow turning.

[0048] The cross-sectional area of the first air inlet 323 on the first 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 first 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 cross-sectional 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 in the prior art and is not marked in the figure) is s2, and s1 / s2≥30% is satisfied, thereby ensuring sufficient ventilation flow rate. When the option of providing the third ventilation holes 324 is selected, the total cross-sectional area of the first air inlet 323 and the third ventilation holes 324 on the first ventilation component 32 (the cross-sectional area of the third ventilation holes 324 is the sum of the areas enclosed by the edges of each third ventilation hole 324) is s3, and s3 / s2≥35% is satisfied.

[0049] The second part 3212 can be in a shape that arches upward from the left and right sides towards the middle. Thus, the middle-arched part forms the ridge portion 3213, and the left and right sides of the ridge portion 3213 form the side portions 3214. Each side portion 3214 gradually slopes downward away from the ridge portion 3213. The vertical distance between the ridge portion 3213 and the projection of the axis X of the fan system 2 on the horizontal plane is d4 (when measuring, the middle position of the ridge portion 3213 in the left-right direction is used as the reference), and it satisfies d4 ≤ D / 2, where D is the diameter of the first suction port 21. d4 represents the degree of deviation of the ridge portion 3212 from the axis X of the fan system 2. Therefore, satisfying d4 ≤ D / 2 enables the ridge portion 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 upward 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.

[0050] Thus, the first air inlet 323 and the first suction port 21 of the fan system 2 cooperate. The convex second part 3212 can guide the airflow towards the first air inlet 323, and the convex direction matches the airflow direction, further reducing the air suction resistance at the moment of starting up. At the same time, the second part 3212 arches upward from the left and right sides towards the middle to form a cavity, making the convergence direction of the oil fume airflow (converging from the left and right sides towards the middle) match the first suction port 21 at the rear (in the conventional fan layout, the suction port of the fan is located in the middle or near the middle of the left and right sides). At the moment of starting up, the distance between the first suction port 21 and the first air inlet 323 is relatively close. 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 and enabling the oil fume to be quickly sucked in and discharged by the fan system 2, thereby improving the oil fume suction efficiency.

[0051] The size of the second part 3212 affects the flow rate ratio of the cooking fume to flow 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 in the front and rear directions is B', and the vertical distance between the front end of the second part 3212 and the projection of the rear side 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 part 3212 is made as large as possible to cover a larger range, so that when the cooking fume rises, a larger proportion of the cooking fume passes through the second part 3212 and flows upward under the guidance of the second part 3212. Compared with the first part 3211 with a larger inclination degree, the cooking fume is guided by the second part 3212, which is beneficial to slowing down the tendency to flow forward along the first part 3211 and increasing the tendency to flow backward, so as to increase the proportion of the cooking fume inhaled from the main suction port at the rear side. More preferably, the axis X of the fan system 2 extends horizontally in the front and rear directions. 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 on the horizontal plane is B1, and B1 / B≥2 / 3 is satisfied.

[0052] The ridge 3213 of the second part 3212 slopes gradually downward from front to back, with an angle of α with the horizontal plane. The inclination angle between the first part 3211 and the horizontal plane is β, and α < β is satisfied. This can further promote the front-back diversion of the oil fume at the second part 3212. Since the first ventilation component 32 as a whole slopes from front to back, and the first suction port 21, as the main suction port, faces the rear side, this will cause the forward diversion direction of the first ventilation component 32 to be contrary to the rear-side air intake of the first suction port 21, which is not conducive to air intake. By providing the second part 3212, since its ridge 3213 can not participate in oil guiding, therefore, as described above, the inclination angle can be smaller than that of the first part 3211, thereby slowing down the overall front-to-back inclination degree of the first ventilation component 32, guiding most of the oil fume to the rear side, and reducing 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. In addition, the setting of the first air inlet 323 or the third ventilation hole 324 can further guide the air flow to the rear side. In addition, the second part 3212 is integrally formed, and the end of its side part 3214 away from the ridge 3213 has a certain distance from the left or right end of the first part 3211. Compared with directly sloping and extending from the ridge 3213 to the left and right side walls of the second housing 12, the shape of the second part 3212 of the present invention can make the side part 3214 have a larger inclination degree, which is beneficial to guiding the oil liquid on the ridge 3213 and the side part 3214 to the left and right sides. Optionally, the ridge 3213 can also slope gradually upward from front to back or extend horizontally from front to back, which will be more beneficial to guiding the oil fume to the rear side. At this time, the inclination angle preferably can take [0°, 60°]. More preferably, the inclination angle is n°, where n is any integer value within (0, 60), or the inclination angle is [0°, n°], and similarly, n is any integer value within (0, 60), or the inclination angle is [n1°, n2°], where n1 and n2 are respectively any integer values within (0, 60).

[0053] 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.

[0054] The first ventilation component 32 further includes a first mounting portion 325 for mounting the first ventilation component body 321 to the second housing 12. The first mounting portion 325 is formed by upward extension from the rear end of the first ventilation component body 321. The bottom of the first mounting portion 325 is recessed upward to form a second air inlet 326. The first air inlet 323 and the second air inlet 326 are integrally connected. The upper edge of the second air inlet 326 is arched from the left and right sides towards the middle. The vertex 3252 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 first ventilation component 32 (here, "corresponds" means corresponding in the left-right direction). The minimum distance between the vertex 3252 of the upper edge of the second air inlet 326 and the ridge 3213 of the first ventilation component 32 is d7. Similarly, to meet the safety requirements and ensure sufficient flow area of the second air inlet 326, d7 ≤ 50 mm.

[0055] A first baffle 3219 is formed at the portion of the second part 3212 located at the edge of the first air inlet 323. The first baffle 3219 is formed by bending the second part 3212 upward. The first mounting portion 325 forms a second baffle 3251 extending forward at the upper edge of the second air inlet 326.

[0056] The fan system 2 includes a volute 23. The above-mentioned first suction port 21 and second suction port 22 are formed in the volute 23. An oil drip nozzle 24 is provided at the lowest position of the volute 23. The first ventilation component body 321 of the first ventilation component 32 has a first end 3215 and a second end 3216 opposite in the front-rear direction. In this embodiment, since the fan system 2 has a rear inlet, the first end 3215 is the rear end and the second end 3216 is the front end. In the horizontal plane projection, the first suction port 21 is located between the oil drip nozzle 24 and the first end 3215, and the first air inlet 323 is located between the oil drip nozzle 24 and the first end 3215. The second part 3212 is located between the first air inlet 323 and the second end 3216 of the first ventilation component body 321.

[0057] In the horizontal plane projection, the second part 3212 covers the oil drip nozzle 24, and the position of the second part 3212 corresponding to the oil drip nozzle 24 is higher than the end of the second part 3212 near the first air inlet 323. Since oil also drips from the end of the volute 23 in the width direction, in the horizontal plane projection, the oil drip portion 231 corresponding to the end face of the volute 23 where the first suction port 21 is opened is located within the second part 3212 to prevent the oil liquid here from dripping vertically downward. The oil drip portion 231 is the bottom of the end face of the volute 23 in this embodiment. Alternatively, it can also be an independent oil guiding component provided at the bottom of the end face and inclined forward and downward.

[0058] Since the axis X of the fan system 2 extends in the front-rear direction, a state is presented where the wind speed is relatively high in the middle and relatively low on both the left and right sides. At this time, if the oil is directly guided to the rear side, due to the relatively high wind speed in the middle, the oil in the middle of the guided rear side will be blown up by the airflow and splashed, and then may drip onto the stove top. Therefore, by providing the raised second part 3212, and through the second part 3212, the received oil is guided to both the left and right sides of the rear side of the housing, and the oil is guided downward at the position with a relatively low wind speed to avoid oil splashing, so that the oil can flow downward along the wall of the housing until it is collected in the oil cup 4.

[0059] Since the inside of the volute 23 is under positive pressure, therefore, at the oil dripping nozzle 24 at the bottom of the volute 23, a high-speed airflow will spray out from the inside of the volute 23 to the outside. In this case, if the first ventilation component 32 and the oil dripping nozzle 24 are too close, it will cause the oil droplets to splash laterally after dropping onto the first ventilation component 32. Since there are openings on the first ventilation component 32 and the splashed oil cannot be blocked laterally, the first ventilation component 32 cannot play the role of receiving the oil dripping from the fan system 2. For this reason, the part of the first ventilation component body 321 of the first ventilation component 32 corresponding to the position of the oil dripping nozzle 24 is in a closed state, and the vertical distance between the oil dripping nozzle 24 and the first ventilation component body 321 of the first ventilation component 32 is c, and c≥8mm is satisfied. See Figure 13 。

[0060] The width of the oil dripping nozzle 24 is d12 (the dimension in the front-rear direction), and the minimum closed area of the part of the first ventilation component body 321 of the first ventilation component 32 corresponding to the position of the oil dripping nozzle 24 is π(d12 / 2 + ctanγ) 2 , where γ is the angle between the line connecting any point on the edge of the oil dripping nozzle 24 and any point on the first ventilation component body 321 and the vertical direction, and γ≥30° is satisfied. Here, it is assumed that the oil dripping nozzle 24 is circular.

[0061] See again Figure 2 , the first ventilation component 32 further includes a second installation part 327 bent upward from the front side of the first ventilation component body 321. A fourth ventilation hole 3271 is provided on the second installation part 327, and it is in a closed state at the position corresponding to the front side of the oil dripping nozzle 24, and the upper end of the closed position is not lower than the lower end of the oil dripping nozzle 24. The flow-through area of the first ventilation hole 322 of the first ventilation component 32 is larger than the flow-through area of the fourth ventilation hole 3271 (the definition of the flow-through area is as that of the first ventilation hole 322).

[0062] A first oil leakage hole 3217 is formed at a first end portion 3215 of the first ventilation component body 321. In the horizontal plane projection, the distance between the first oil leakage hole 3217 and the ridge portion 3213 is d5 (when measuring, the middle position of the ridge portion 3213 in the left - right direction is used as a reference), and d5≥50mm is satisfied, so that the first oil leakage hole 3217 keeps a sufficient distance from the position with a relatively large intermediate wind speed in the fan system 2 to avoid being affected by the high - speed airflow on the oil liquid. There may be two first oil leakage holes 3217, corresponding to two side portions 3214 of the second part 3212. One side of the side portion 3214 away from the ridge portion 3213 extends to the first end portion 3215 of the first ventilation component body 321, and the first oil leakage hole 3217 may be formed at the transition position between the side portion 3214 and the first end portion 3215. In the vertical plane projection, the distance between the axis X of the fan system 2 and the first oil leakage hole 3217 is h1. When h1≤350mm, at this time, the center of the first suction port 21 of the fan system 2 and the first oil leakage hole 3217 are in a state of relatively close distance. Therefore, the distance between the two will have a greater impact on the oil liquid. At this time, (d5 + d4) / h1 = tanθ, θ≥10°; when h1>350mm, no requirement is made for θ; thus reducing the interference of the airflow on the dripping paths of the oil liquid on both sides and preventing the oil liquid from drifting towards the center.

[0063] A second oil leakage hole 3218 is also formed at the first end portion 3215 of the first ventilation component body 321. The distance between the second oil leakage hole 3218 and the axis X of the fan system 2 is greater than the distance between the first oil leakage hole 3217 and the axis X of the fan system 2, so as to guide the oil liquid on the first part 3211 of the first ventilation component body 321 downward.

[0064] The side portion 3214 also gradually slopes downward from front to back, and its inclination angle relative to the horizontal plane is also β, so as to promote the oil liquid on the ridge portion 3213 to flow towards the side portion 3214.

[0065] See Figure 11 and Figure 12 As shown in and, the above - mentioned oil cup 4 corresponds to the first end portion 3215 of the first ventilation component body 321. The width dimension of the upper open end portion of the oil cup 4 in the front - back direction is d6, and the spacing between the first end portion 3215 of the first ventilation component body 321 and the rear side wall of the second housing 12 is d11, and it is satisfied that in the second state, (d6 - d11) / d5≥0.1, so that the oil liquid can flow into the oil cup 4 without drifting forward outside the range of the oil cup 4.

[0066] A control panel 5 is provided on the front side of the first housing 11. When the first housing 11 descends, it can descend to a height of about 450 mm from the cooking range 4. The range hood further includes a back plate 13, which is provided at the rear side portion of the first housing 11. The horizontal distance from the front side of the smoke collecting hood 6 to the back plate 13 is 345-350 mm. The thickness of the smoke collecting hood 6 is 20-30 mm.

[0067] The smoke collecting cavity 61 is in a shape that arches from the front and rear sides towards the middle, and the highest point is close to the front side of the first housing 11. The depth of the smoke collecting cavity 61 in the front-rear direction is S. The angle between the wall surface formed by the smoke collecting hood 6 on the front side of the smoke collecting cavity 61 and the horizontal direction is θ1, and the angle between the wall surface formed by the smoke collecting hood 6 on the rear side of the smoke collecting cavity 61 and the horizontal direction is θ2. To ensure the smoke collecting effect of the smoke collecting cavity 61, S≥280 mm and θ1≥25°. To ensure the oil guiding function, it is necessary to satisfy θ2≥12° and the above-mentioned β ( Figure 6 shown in)≥12°.

[0068] As used in the present invention, "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, a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first part and / or be transported 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 passage such as a pipe, a channel, a conduit, a flow guiding member, a hole, a groove, etc., or a chamber allowing the fluid to flow through, or a combination of the above.

Claims

1. An oil fume extractor, comprising a housing and a fan system (2) disposed within the housing. A first ventilation component (32) is provided below the fan system (2). The fan system (2) includes a volute (23), and an oil drip nozzle (24) is provided at the lowest position of the volute (23). It is characterized in that: The part of the first ventilation component (32) corresponding to the position of the oil drip nozzle (24) is in a closed state. The vertical distance between the oil drip nozzle (24) and the first ventilation component (32) is c, and c≥8mm is satisfied.

2. The range hood according to claim 1, wherein: The first ventilation component (32) includes a first ventilation component body (321) located below the fan system (2). Here, c is the vertical distance between the oil drip nozzle (24) and the first ventilation component body (321). The width of the oil drip nozzle (24) is d12. The minimum enclosed area of the part of the first ventilation component body (321) of the first ventilation component (32) corresponding to the position of the oil drip nozzle (24) is π(d12 / 2 + ctanγ). 2 , where γ is the angle between the line connecting any point on the edge of the oil drip nozzle (24) and any point on the first ventilation component body (321) and the vertical direction, and γ ≥ 30°.

3. The range hood according to claim 1, wherein: The first ventilation component (32) includes a first ventilation component body (321) located below the fan system (2) and a second installation portion (327) bent upward from the front side of the first ventilation component body (321). The above-mentioned c is the vertical distance between the oil drip nozzle (24) and the first ventilation component body (321). The second installation portion (327) is in a closed state at the position corresponding to the front side of the oil drip nozzle (24).

4. The range hood according to claim 3, characterized in that: The upper end of the closed position of the second installation portion (327) is not lower than the lower end of the oil drip nozzle (24).

5. The range hood according to claim 3, characterized in that: The axis X of the fan system (2) extends in the front-rear direction. A first ventilation hole (322) is provided on the first ventilation component body (321), and a fourth ventilation hole (3271) is provided on the second installation portion (327).

6. The range hood according to claim 5, characterized in that: The fan system (2) includes a first suction port (21) facing the rear side as the main suction port and a second suction port (22) facing the front side as the auxiliary suction port. The flow-through area of the first ventilation hole (322) of the first ventilation component (32) is larger than the flow-through area of the fourth ventilation hole (3271).

7. The range hood according to claim 1, wherein: The first ventilation component (32) includes a first ventilation component body (321) located below the fan system (2). The above-mentioned c is the vertical distance between the oil drip nozzle (24) and the first ventilation component body (321). The first ventilation component body (321) gradually slopes downward backward from the position corresponding to the oil drip nozzle (24). An oil cup (4) is provided at the rear side of the bottom of the housing.

8. The range hood according to claim 7, characterized in that: The first ventilation component body (321) includes a first part (3211) and a second part (3212) protruding upward relative to the first part (3211). The oil drip nozzle (24) is located above the second part (3212). The second part (3212) is integrally shaped like an arch rising upward from the left and right sides to the middle. The left and right sides of the second part (3212) gradually slope downward from the front to the rear, and the distance between the left and right sides of the second part (3212) gradually increases from the front to the rear.

9. The range hood according to claim 8, wherein: The fan system (2) includes a first suction port (21) facing the rear side. A first oil leakage hole (3217) is provided at the rear end of the first ventilation component (32), and the first oil leakage hole (3217) corresponds to the left and right sides of the second part (3212).

10. The range hood according to claim 1, wherein: The housing includes 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 is at least partially located below the second housing (12). The fan system (2) is disposed within the second housing (12), and the first ventilation component (32) is disposed at the bottom of the second housing (12) or within the second housing (12).

11. The range hood according to claim 10, wherein: The first ventilation component (32) is disposed at the bottom of the second housing (12), and the projection of the edge of the first ventilation component (32) on the horizontal plane covers the projection of the edge of the second housing (12) on the horizontal plane.

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