Range hood

Abstract

The utility model discloses a range hood, which comprises a first shell and a second shell, at least part of the first shell is located below the second shell and wraps the periphery of the second shell, and the first shell can ascend and descend relative to the second shell; the fan system is arranged in the second shell, and the axis of the fan system extends front and back; the exhaust fume collecting hood is arranged at the bottom of the first shell, and an exhaust fume suction opening is formed in the exhaust fume collecting hood; a first ventilation member; the second ventilation component is arranged at the smoke suction port; the first ventilation component is connected to the bottom of the second shell, the first ventilation component comprises a first ventilation component body arranged corresponding to the lower portion of the fan system, and the first ventilation component body comprises a first part gradually extending downwards from front to back and a second part protruding upwards relative to the first part; the second part is provided with a ridge part and side parts located on the left side and the right side of the ridge part, the side parts gradually incline downwards in the direction away from the ridge part, and the width of the second part in the left-right direction is gradually increased from front to back.

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 fume through a fan system installed inside the range hood and use a filter screen to filter out some grease 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 fume below the range hood into the fan. After being accelerated by the fan, it is collected by the volute and guided out of the room.

[0003] For existing top-mounted range hoods, in order to prevent the oil liquid in the box from dripping directly downward, a filter screen is usually set. For example, an oil mesh assembly disclosed in a Chinese patent with the application number 202121836163.5 by the applicant includes a first oil mesh. The oil mesh assembly further includes a second oil mesh spaced from the first oil mesh. The second oil mesh has opposite first and second ends, and the second oil mesh further has a third end located between the first and second ends. The second oil mesh extends obliquely from the opposite ends towards the third end, such that the third end is outside the plane where the first and second ends are located.

[0004] For such a range hood, by adopting a double-sided oil guiding structure with a raised middle for the second oil mesh, a larger oil guiding angle is achieved. However, its raised third end extends along the left-right width direction of the range hood, which is not conducive to guiding the oil liquid in the middle to the left and right sides, and it is easy for the oil liquid to accumulate in the middle and be blown up and splashed by 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 can meet the requirements of both oil guiding and oil flow guiding for the above-mentioned existing technology.

[0006] The technical solution adopted by the utility model to solve the above technical problem is as follows: A range hood, comprising:

[0007] A first housing;

[0008] A second housing, at least part of the first housing is located below the second housing and wraps around the outer periphery of the second housing, and the first housing can move up and down relative to the second housing;

[0009] A fan system, arranged in the second housing, and the axis of the fan system extends back and forth;

[0010] A smoke collecting hood, arranged at the bottom of the first housing, and a smoking port is provided on the smoke collecting hood;

[0011] The first ventilation component; and

[0012] A second ventilation component, disposed at the smoking port, on the oil fume flow path, and upstream of the first ventilation component;

[0013] It is characterized in that:

[0014] The first ventilation component is connected to the bottom of the second housing. The first ventilation component body is disposed below the corresponding fan system. The first ventilation component body includes a first part that gradually extends downward from front to back and a second part that protrudes upward relative to the first part;

[0015] The second part has a ridge and side parts on the left and right sides of the ridge. The side parts gradually slope downward away from the ridge. The width of the second part in the left - right direction gradually increases from front to back. The front - side edge and the left - and right - side edges of the second part respectively transition to the first part.

[0016] By providing the second part, since its ridge can be not involved in oil guiding, therefore, it is convenient to independently design the inclination angle of the second part relative to the first part. The inclination angle can be reduced, and it can even gradually extend upward backward, thereby slowing down the overall inclination degree of the first ventilation component from front to back, 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. This is beneficial for most of the oil fume to be shunted to the rear side and enter the fan system, facilitating the fan system to use the suction port at the rear side as the main suction port to achieve direct suction and direct discharge. In addition, the width of the second part gradually increases backward, which can guide the oil liquid along the edges of the side parts away from the ridge to the left and right sides of the rear end, so as to collect the oil liquid only from the left and right sides.

[0017] Preferably, the ridge of the second part gradually slopes downward from front to back and the angle between it and the horizontal plane is α, the inclination angle between the first part and the horizontal plane is β, and α < β is satisfied. Thus, the second part can promote the front - rear shunting 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 for most of the oil fume to be shunted to the rear side and enter the fan system.

[0018] Preferably, a first oil leakage hole is formed at the rear - side end of the first ventilation component body. In the horizontal plane projection, the distance between the first oil leakage hole and the axis of the fan system is d5, and d5 ≥ 50mm is satisfied, so as to keep a sufficient distance between the first oil leakage hole and the position with a relatively large wind speed in the middle of the fan system to avoid being affected by the high - speed air flow on the oil liquid.

[0019] Preferably, the side of the second part of the first ventilation component body away from the ridge extends to the rear end of the first ventilation component body, and the first oil leakage hole is formed at the transition position between the side of the second part and the rear end of the first ventilation component body.

[0020] To facilitate the downward flow of the oil on the first part of the first ventilation component for collection, a second oil leakage hole is further formed at the rear end of the first ventilation component body, and the distance between the second oil leakage hole and the axis of the fan system is greater than the distance between the first oil leakage hole and the axis of the fan system.

[0021] Furthermore, the fan system at least includes a first suction port facing the rear side. A first air inlet is formed on the first ventilation component body, and one side edge of the first air inlet is formed at the rear end of the second part. Thus, the first air inlet and the fan system cooperate. The raised second part can guide the airflow towards the first air inlet, and the raised direction matches the airflow direction. It can also make the convergence direction of the oil fume airflow match the first suction port of the fan system at the rear side. At the moment of starting up, the fan is relatively close to the first air inlet, and the oil fume gas can directly enter the first suction port of the fan at the rear side through the protrusion along the rear notch of the first ventilation component, greatly shortening the oil fume path and improving the oil fume suction efficiency.

[0022] Furthermore, to increase the air intake volume, the first ventilation component further includes a first installation part for installing the first ventilation component body to the second housing. The first installation part is formed by extending upward from the rear end of the first ventilation component body, and a second air inlet is formed by the upward depression at the bottom of the first installation part. The first air inlet and the second air inlet are connected as a whole.

[0023] Furthermore, the upper edge of the second air inlet is in a shape that arches from the left and right sides towards the middle, which can promote the convergence of the oil fume from the left and right sides towards the middle and quickly enter the first suction port.

[0024] To further increase the area when the oil fume passes through, a first ventilation hole is opened on the first ventilation component body, the second ventilation component has a second ventilation hole, and a third ventilation hole is opened on the second part.

[0025] Furthermore, the fan system further includes a second suction port facing forward. The first ventilation component further includes a second installation part bent upward from the front side of the first ventilation component body, and a fourth ventilation hole is opened on the second installation part, which can facilitate the passage of the oil fume into the second suction port.

[0026] Compared with the prior art, the advantages of the present utility model are as follows: By providing the second part, since its ridge part can be not involved in oil guiding, it is convenient to independently design the inclination angle of the second part relative to the first part. The inclination angle can be reduced, and it can even gradually extend upward backward, thereby slowing down the overall inclination degree of the first ventilation component from front to back, guiding most of the oil fume backward, and reducing the influence of the inclination on the forward diversion of the oil fume. This is conducive to most of the oil fume being shunted backward and entering the fan system, facilitating the fan system to use the suction inlet at the rear side as the main suction inlet to achieve direct suction and direct discharge. In addition, the width of the second part gradually increases backward, enabling the oil liquid to be guided along the edges of the side away from the ridge part to the left and right sides at the rear end, so that the oil liquid can be collected only from the left and right sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the range hood according to an embodiment of the present utility model (first state);

[0028] Figure 2 Exploded structural schematic diagram of the range hood according to an embodiment of the present utility model;

[0029] 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);

[0030] Figure 4 is Figure 3 partial enlarged schematic diagram of I;

[0031] Figure 5 Schematic diagram of the first ventilation component of the range hood according to an embodiment of the present utility model;

[0032] 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);

[0033] 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 back to front);

[0034] 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;

[0035] Figure 9 Cross-sectional view of the second housing, the motion mechanism and the second ventilation component of the range hood according to an embodiment of the present utility model (left-to-right cross-section);

[0036] Figure 10 is Figure 9 partial enlarged schematic diagram of II;

[0037] Figure 11 Schematic diagram (second state) of the range hood according to an embodiment of the present utility model;

[0038] Figure 12 Cross-sectional view (second state, front-to-back cross-section) of the range hood according to an embodiment of the present utility model;

[0039] Figure 13 is Figure 12 Partial enlarged schematic view of III;

[0040] Figure 14 Cross-sectional view (front-to-back cross-section) of an alternative embodiment of the first ventilation component of the range hood according to an embodiment of the present utility model. Detailed implementation manners

[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0042] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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. These 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 embodiments disclosed by the present utility model can be arranged in different directions, these terms indicating directions should only be regarded as explanations and 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 with "first" and "second" may explicitly or implicitly include one or more of such features.

[0043] Refer to Figures 1 - 8 , a range hood, which is a top-suction range hood, includes 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, their horizontal cross-sections can both be rectangular.

[0044] The outer shell 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 in the smoke collecting hood 6. A smoke suction port 62 is formed at the top of the smoke collecting hood 6 at the smoke collecting cavity 61. By forming the upwardly 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 range hood can be better realized.

[0045] The range hood further includes a fan system 2 and a ventilation component. The fan system 2 is at least partially disposed in the second housing 12. In this embodiment, the fan system 2 is a centrifugal fan. The ventilation component includes a first ventilation member 32 and a second ventilation member 31. 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 liquid flowing down from the inner side wall surface of the second housing 12 and the fan system 2. The first 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 first ventilation member 32 can receive the oil liquid flowing down from the inner side wall surface of the second housing 12, when the connection position is inside the second housing 12, the first 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 first 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 first 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 part on the front side of the first 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 part on the right side of the first 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.

[0046] 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 the shape of a flat plate, and the second ventilation holes 312 are elongated ventilation holes and extend in the front-back 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 elongated ventilation holes and extend in the front-back direction. To avoid oil dripping, the second ventilation holes 312 and the first ventilation holes 322 are arranged in a staggered manner, that is, the second ventilation holes 312 correspond to the solid part between two adjacent first ventilation holes 322, and the first ventilation holes 322 correspond to the solid part between two adjacent first ventilation holes 322. The first ventilation component 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 the shape of a flat plate. The first ventilation component 32 and the second ventilation component 31 are both filter meshes in this embodiment, and alternatively, they can also be formed by opening holes in a plate member.

[0047] 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 orientations of the two-layer filter meshes are basically the same, and the grille orientation of the first ventilation component 32 can also be the same as 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 also reducing noise.

[0048] 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. Thus, the air volume, noise, and total pressure efficiency can be satisfied, and the resistance of the first ventilation component 32 to the air flow can be minimized as much as possible.

[0049] The lifting of the first housing 11 can meet the requirements of gathering 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 arranging a motion mechanism, simplifying the structure and reducing the cost.

[0050] 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 to pass through the first ventilation holes 322 more. 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 an 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.

[0051] In the first state, when d1 ≤ 20 mm, if the filter 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 comfort of experience, 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 upward relative to the first part 3211 away from the second ventilation component 31, that is, upward, so that there is a part with a larger distance 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 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.

[0052] 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 distance between the two filter screens is enlarged instantaneously, 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.

[0053] The vertical distance between the highest point of the above-mentioned 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-through area. In addition, considering the compactness of the whole machine, it is preferably further 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).

[0054] An oil cup 4 is provided at the bottom 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 as the main suction port and a second suction port 22 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.

[0055] Accordingly, the first part 3211 wraps around the outer periphery of the second part 3212 on the front, left, and right three 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 cooking 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 second ventilation component 31 and the first ventilation component 32, reducing the energy loss caused by the turning of the air flow.

[0056] The flow-through 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 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, thereby ensuring 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 first ventilation component 32 (the flow-through 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.

[0057] The second part 3212 can be in a shape that arches upward from the left and right sides towards the middle. Thus, the upwardly arched part in the middle constitutes the ridge portion 3213, and the left and right sides of the ridge portion 3213 constitute the side portions 3214. Each side portion 3214 gradually slopes downward in a direction 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 between the ridge portion 3212 and 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, so as to promote the oil - fume to flow towards the first suction port 21.

[0058] 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, enabling the oil - fume to be quickly sucked in and discharged by the fan system 2, thereby improving the oil - fume suction efficiency.

[0059] 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. When the cooking fume rises, a larger proportion of the cooking fume passes through the second part 3212, so as to flow 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 of flowing forward along the first part 3211 and increasing the tendency of flowing backward, so as to increase the proportion of the cooking fume inhaled from the rear main suction port. More preferably, the axis X of the fan system 2 extends horizontally forward and backward. 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.

[0060] The ridge 3213 of the second part 3212 is gradually inclined downward from front to back, and the included angle with the horizontal plane is α. The inclination angle between the first part 3211 and the horizontal plane is β, and α<β is satisfied. Thus, the cooking fume can be further promoted to be shunted forward and backward at the second part 3212. Since the first ventilation component 32 is inclined from front to back as a whole, and the first suction port 21, as the main suction port, faces the rear side, this will cause the forward guiding 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 inclination degree of the first ventilation component 32 as a whole from front to back, guiding most of the cooking fume to the rear side, and reducing the influence of the inclination on the forward guiding of the cooking fume, which is beneficial to the shunting of most of the cooking fume to the rear side and entering 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 flow backward. In addition, the second part 3212 is integrally formed, and the end of the side part 3214 away from the ridge 3213 has a certain distance from the left end or the right end of the first part 3211. Compared with directly extending obliquely 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 be gradually inclined upward from front to back or extend horizontally from front to back. See Figure 14, this will better facilitate the rearward diversion of the fume. At this time, the inclination angle is preferably in the range of [0°, 65°]. More preferably, the inclination angle is n°, where n is any integer value within (0, 65), or the inclination angle is [0°, n°], and again n is any integer value within (0, 65), or the inclination angle is [n1°, n2°], where n1 and n2 are respectively any integer values within (0, 65).

[0061] To meet the safety regulations requirements, that is, to prevent users or other installation, maintenance, and other staff from accessing the fan system 2 through the first air inlet 323, and at the same time ensure that the first air inlet 323 has sufficient flow area, the distance between the front side edge of the first air inlet 323 and the rear side wall of the second housing 12 is d3, and d3 ≤ 50 mm is satisfied.

[0062] The first ventilation component 32 further includes a first installation portion 325 for installing the first ventilation component body 321 to the second housing 12. The first installation portion 325 is formed by extending upward from the rear side end of the first ventilation component body 321. The bottom of the first 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 in a shape that arches from the left and right sides to 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 regulations requirements and ensure that the second air inlet 326 has sufficient flow area, d7 ≤ 50 mm.

[0063] 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 installation portion 325 forms a second baffle 3251 that extends forward at the upper edge of the second air inlet 326.

[0064] 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, and 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 that are 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.

[0065] 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 close to the first air inlet 323. Since oil also drips from the end of the volute 23 in the width direction, therefore, in the horizontal plane projection, the oil drip part 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 in the volute 23 from dripping vertically downward. The oil drip part 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 that is inclined forward and downward at the bottom of the end face.

[0066] Since the axis X of the fan system 2 extends in the front-rear direction, a state where the wind speed is relatively large in the middle and relatively small on the left and right sides is presented. At this time, if the oil is directly guided to the rear side, due to the relatively large wind speed in the middle, the oil guided to the middle of the rear side will be blown up by the airflow and splashed, and then it 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 the left and right sides of the rear side part of the housing, and the oil is guided downward at the position where the wind speed is relatively small 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.

[0067] Since the pressure inside the volute 23 is positive, therefore, at the oil drip 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 distance between the first ventilation component 32 and the oil drip nozzle 24 is too close, it will cause the oil liquid to splash laterally after dripping 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 will not be able to 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 drip nozzle 24 is in a closed state. The vertical distance between the oil drip 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。

[0068] The width of the oil dripping nozzle 24 is d12 (the dimension in the front-rear direction). 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 has a minimum closed area of 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°. Here, it is assumed that the oil dripping nozzle 24 is circular.

[0069] 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 formed 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 bottommost part 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).

[0070] A first oil leakage hole 3217 is formed at the first end 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 3213 is d5 (when measuring, take the middle position of the ridge 3213 in the left-right direction as the standard), and d5≥50mm, so as to keep a sufficient distance between the first oil leakage hole 3217 and the position with a relatively large intermediate wind speed in the fan system 2 to avoid being affected by the high-speed air flow on the oil liquid. There may be two first oil leakage holes 3217, corresponding to the two side parts 3214 of the second part 3212. One side of the side part 3214 away from the ridge 3213 extends to the first end 3215 of the first ventilation component body 321. Thus, a transition position is formed between the part of the side part 3214 extending to the first end 3215 and the first end 3215, and the first oil leakage hole 3217 can be formed at the transition position between the side part 3214 and the first end 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 has 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 air flow on the dripping paths of the oil liquid on both sides and preventing the oil liquid from drifting towards the center.

[0071] A second oil leakage hole 3218 is also formed at the first end 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 on the first part 3211 of the first ventilation component body 321 downward.

[0072] The side part 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 on the ridge part 3213 to flow to the side part 3214.

[0073] See Figure 11 and Figure 12 As shown in and, the above-mentioned oil cup 4 corresponds to the first end 3215 of the first ventilation component body 321. The width dimension of the upper open end of the oil cup 4 in the front-back direction is d6, and the distance between the first end 3215 of the first ventilation component body 321 and the rear side wall of the second housing 12 is d11, and it satisfies that in the second state, (d6 - d11) / d5 ≥ 0.1, so that the oil can flow into the oil cup 4 without drifting forward outside the range of the oil cup 4.

[0074] A control panel 5 is arranged 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. The range hood also includes a back plate 13, which is arranged at the rear side part of the first housing 11, and 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 ≤ 50 mm.

[0075] The smoke collecting cavity 61 is arched from both 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-back direction is S, and the included 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 θ 1 , and the included 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 θ 2 . To ensure the smoke collecting effect of the smoke collecting cavity 61, S ≥ 280 mm, θ 1 ≥ 25°. To ensure the oil guiding function, it is necessary to satisfy that θ 2 ≥ 12°, and the above-mentioned β (shown in Figure 6 ) ≥ 12°.

[0076] As used herein, "fluid communication" refers to the spatial 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 from the first part along a flow path and / or be transported to the second part. It can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid passage such as a pipe, channel, conduit, flow guide, hole, groove, etc., or a chamber allowing fluid to flow through, or a combination thereof.

Claims

1. A range hood, comprising: A first housing (11); a second shell (12), wherein the first shell (11) is at least partially located below the second shell (12) and covers the outer periphery of the second shell (12), and the first shell (11) can be lifted or lowered relative to the second shell (12); A fan system (2) is arranged in the second housing (12), and an axis (X) of the fan system (2) extends forward and backward; A smoke collecting hood (6) is arranged at the bottom of the first shell (11), and a smoke outlet (62) is provided on the smoke collecting hood (6); A first ventilation component (32); as well as A second ventilation component (31) is arranged at the smoking port (62), on the oil smoke flow path, and is located upstream of the first ventilation component (32); Features: The first ventilation component (32) is connected to the bottom of the second housing (12), the first ventilation component (32) comprises a first ventilation component body (321) arranged below the corresponding fan system (2), the first ventilation component body (321) comprises a first portion (3211) gradually extending downward from front to rear and a second portion (3212) protruding upward relative to the first portion (3211); The second part (3212) has a ridge (3213) and side parts (3214) located on the left and right sides of the ridge (3213), and the side parts (3214) gradually tilt downward in the direction away from the ridge (3213). The width of the second part (3212) in the left and right directions gradually increases from front to back, and the front edge and left and right edges of the second part (3212) respectively transition to the first part (3211).

2. The range hood according to claim 1, characterized in that: The ridge (3213) of the second part (3212) gradually tilts downward from front to back and the angle between it and the horizontal plane is α, the inclination angle between the first part (3211) and the horizontal plane is β, and α<β is satisfied.

3. The range hood according to claim 1, characterized in that: A first oil leakage hole (3217) is formed at the rear end of the first ventilation component body (321). In horizontal plane projection, the distance between the first oil leakage hole (3217) and the axis (X) of the fan system (2) is d5, and d5≥50mm is satisfied.

4. The range hood according to claim 3, characterized in that: The side portion (3214) of the second part (3212) of the first ventilation component body (321) extends from one side away from the ridge (3213) to the rear end of the first ventilation component body (321), and the first oil leakage hole (3217) is formed at a transition position between the side portion (3214) of the second part (3212) and the rear end of the first ventilation component body (321).

5. The range hood according to claim 4, characterized in that: A second oil leakage hole (3218) is also formed at the rear end of the first ventilation component body (321), and 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).

6. The range hood according to claim 1, characterized in that: The fan system (2) comprises at least a first suction port (21) facing the rear side, a first air inlet (323) is formed on the first ventilation component body (321), and the rear end of the second part (3212) forms a side edge of the first air inlet (323).

7. The range hood according to claim 6, characterized in that: The first ventilation component (32) also includes a first mounting portion (325) for mounting the first ventilation component body (321) to the second shell (12), the first mounting portion (325) being formed by extending upward from the rear end portion of the first ventilation component body (321), the bottom of the first mounting portion (325) being recessed upward to form a second air inlet (326), the first air inlet (323) and the second air inlet (326) being connected to form a whole.

8. The range hood according to claim 7, characterized in that: The upper edge of the second air inlet (326) is in a shape that arches from the left and right sides toward the middle.

9. The range hood according to claim 1, characterized in that: The first ventilation component body (321) is provided with a first ventilation hole (322), the second ventilation component (31) has a second ventilation hole (312), and the second part (3212) is provided with a third ventilation hole (324).

10. The range hood according to claim 1, characterized in that: The fan system (2) further comprises a second suction port (22) facing forward, and the first ventilation component (32) further comprises a second mounting portion (327) bent upward from the front side of the first ventilation component body (321), and a fourth ventilation hole (3271) is provided on the second mounting portion (327).

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