A range hood

Abstract

The utility model discloses a kind of range hood, including shell, fan system being arranged in shell and oil cup being arranged in the rear side bottom of shell, the fan system includes the first suction port to rear, the lower of the fan system is provided with first ventilation component;The first ventilation component includes the first ventilation component body being arranged in the lower of corresponding fan system, the first ventilation component body includes the first part gradually extending downwards from front to rear and the second part being protruded upwards relative to first part, the first part is provided with first ventilation hole;The second part has ridge and side portion located in the left and right sides of ridge, the side portion gradually inclines downwards in the direction away from ridge, the left end of second part is located in the right side of first part, the right end of second part is located in the left side of first part.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a fan system installed inside to draw in cooking fumes and filtering out some grease particles with a filter. The fan system is typically a centrifugal fan, consisting of a casing, an impeller housed within the casing, and a motor that drives the impeller. When the impeller rotates, a negative pressure suction is generated at the center of the fan, drawing the cooking fumes from below into the fan. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] Existing top-mounted range hoods typically incorporate filters to prevent oil from dripping directly downwards from the casing. For example, Chinese Patent Application No. 202121836163.5 discloses an oil filter assembly that includes a first oil filter and a second oil filter spaced apart from the first oil filter. The second oil filter has a first end and a second end opposite to each other, and a third end located between the first end and the second end. The second oil filter extends obliquely from the two opposite ends toward the third end, such that the third end is located outside the plane containing the first end and the second end.

[0004] This type of range hood uses a double-sided oil guiding structure with a raised middle section for the second oil filter to achieve a larger oil guiding angle. However, if this oil filter structure is used in a range hood with rear air intake, the oil guiding direction will be contrary to the airflow direction (most of the oil fumes will be guided forward by the part between the second and third ends), which will not meet the airflow requirements. Moreover, its raised third end extends along the left and right width of the range hood, which is not conducive to guiding the oil in the middle to the left and right sides, and the oil is prone to accumulate in the middle and be blown up and splashed by the fan. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a range hood that meets the requirements of both oil guiding and flow guiding, in order to address the shortcomings of the existing technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a range hood, including a shell, a fan system disposed within the shell, and an oil cup disposed at the bottom rear side of the shell, wherein the fan system includes a rearward-facing first intake inlet, and a first ventilation component is disposed below the fan system; characterized in that:

[0007] The first ventilation component includes a first ventilation component body 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. The first part is provided with a first ventilation hole.

[0008] The second part has a ridge and side portions located on the left and right sides of the ridge, the side portions gradually sloping downward away from the ridge, the left end of the second part being located to the right of the left end of the first part, and the right end of the second part being located to the left of the right end of the first part.

[0009] By setting up a second part, since its ridge does not participate in oil guiding, the tilt angle of the second part can be designed independently relative to the first part. The tilt angle can be reduced, and it can even extend gradually backward and upward, thereby slowing down the overall tilt of the first ventilation component from front to back. This guides most of the oil fumes to the rear and reduces the impact of tilt on the forward flow of oil fumes, which is conducive to most of the oil fumes being diverted to the rear and entering the first intake. In addition, the second part is integrally formed, and the end of its side away from the ridge is a certain distance from the left or right end of the first part. Compared with the side wall of the shell extending directly from the ridge, the shape of the second part allows for a greater tilt of the side, which is beneficial for guiding the oil on the ridge and side to the left and right sides.

[0010] According to one aspect of this invention, the ridge of the second part gradually slopes downward from front to back, with an angle α between it and the horizontal plane, while the angle of inclination of the first part to the horizontal plane is β, and α < β. This allows the second part to promote the diversion of oil fumes at the front and back, and reduces the impact of the inclination on the forward flow of oil fumes, thus facilitating the diversion of most oil fumes to the rear and their entry into the first inlet.

[0011] According to another aspect of the present invention, the ridge gradually tilts upward from front to back or extends horizontally from front to back, thereby better reducing the influence of the first part tilting on the forward flow of oil fumes, and further diverting most of the oil fumes to the rear side to enter the first inlet.

[0012] To facilitate the backward guidance of the oil in the second part, the width of the second part gradually increases from front to back in the left-right direction.

[0013] Preferably, the axis of the fan system extends forward and backward, and a first oil leakage hole is formed at the rear end of the body of the first ventilation component. On the horizontal projection, the distance between the first oil leakage hole and the axis of the fan system is d5, and d5≥50mm is satisfied, so that the first oil leakage hole maintains a sufficient distance from the middle of the fan system where the wind speed is high to avoid the influence of high-speed airflow on the oil.

[0014] Preferably, the side of the second portion 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 portion and the rear end of the first ventilation component body.

[0015] To facilitate the downward flow and collection of oil on the first part of the first ventilation component, a second oil leakage hole is formed at the rear end of the body of the first ventilation component. 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.

[0016] Furthermore, in the horizontal projection, the vertical distance between the ridge and the axis of the fan system is d4, and in the vertical projection, the distance between the axis of the fan system and the first oil leakage hole is h1. When h1≤350mm, / h1=tanθ, and θ≥10°, thereby reducing the interference of airflow on the oil dripping path on both sides and preventing the oil from drifting towards the center.

[0017] Furthermore, on the horizontal projection, the vertical distance between the ridge and the axis of the fan system is d4, and d4≤D / 2, where D is the diameter of the first inlet. The second part arches from the left and right sides toward the middle to form a cavity, so that the direction of the oil fume flow converges with the first inlet on the rear side, thereby promoting the flow of oil fumes toward the first inlet.

[0018] Preferably, to improve the smoke collection effect, the bottom of the outer shell is recessed upward to form a smoke collection cavity, the depth of the smoke collection cavity in the front-back direction is S, the angle between the wall of the outer shell forming the front side of the smoke collection cavity and the horizontal direction is θ1, and satisfies: S≥280mm, θ1≥25°.

[0019] Preferably, to ensure the oil guiding function of the smoke collection chamber, the angle between the rear wall of the outer shell forming the smoke collection chamber and the horizontal direction is θ2, and θ2≥12° is satisfied.

[0020] Compared with the prior art, the advantages of this utility model are as follows: By setting the second part, since its ridge does not participate in oil guiding, the tilt angle of the second part can be designed independently relative to the first part. This can reduce the tilt angle from front to back, and can even extend gradually from back to top, thereby slowing down the overall tilt of the first ventilation component from front to back. This guides most of the oil fumes to the rear and reduces the impact of tilt on the forward flow of oil fumes, which is conducive to the majority of oil fumes being diverted to the rear and entering the first suction port. In addition, the second part is integrally formed, and the end of its side away from the ridge is a certain distance from the left or right end of the first part. Compared with the left and right side walls of the first ventilation component body that extend directly from the ridge, the shape of the second part allows for a greater tilt angle on the side, which is conducive to guiding the oil on the ridge and side to the left and right sides, and guiding the oil through the first part to the second part, and finally into the oil cup. Attached Figure Description

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

[0022] Figure 2 This is an exploded structural diagram of the range hood according to an embodiment of the present utility model;

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

[0024] Figure 4 for Figure 3 A magnified schematic diagram of part I;

[0025] Figure 5 This is a schematic diagram of the first ventilation component of the range hood according to an embodiment of the present utility model;

[0026] Figure 6 This is a cross-sectional view (front and rear section) of the first ventilation component of the range hood according to an embodiment of the present utility model;

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

[0028] Figure 8 This is a schematic diagram of the concealed second housing portion, the first housing, the second ventilation component, and the oil cup of the range hood according to an embodiment of the present utility model;

[0029] Figure 9 This is a cross-sectional view (left-right section) of the second housing, motion mechanism, and second ventilation component of the range hood according to an embodiment of the present utility model;

[0030] Figure 10 for Figure 9 A magnified schematic diagram of part II;

[0031] Figure 11 This is a schematic diagram (second state) of a range hood according to an embodiment of the present utility model;

[0032] Figure 12 This is a cross-sectional view (second state, front and rear section) of the range hood according to an embodiment of the present utility model;

[0033] Figure 13 for Figure 12 A magnified schematic diagram of part III;

[0034] Figure 14 This is a cross-sectional view (front and rear section) of an alternative embodiment of the first ventilation component of the range hood in this utility model. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0036] In the description of this 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," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to 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.

[0037] See Figures 1 to 8 A range hood, specifically a top-mounted range hood, includes an outer casing comprising a first housing 11 and a second housing 12. The first housing 11 at least partially covers the outer periphery of the second housing 12 and is at least partially located below the second housing 12. The second housing 12 can be fixed to an external mounting base, such as a wall, while the first housing 11 can be raised and lowered relative to the second housing 12. Both the first housing 11 and the second housing 12 are hollow structures, fluidly connected to each other, and preferably both have rectangular horizontal cross-sections.

[0038] The outer casing also includes a smoke collection hood 6 located at the bottom of the first housing 11. The smoke collection hood 6 has a smoke collection chamber 61 that rises upwards from the bottom surface, and a smoke inlet 62 is formed at the top of the smoke collection chamber 61. By forming the upward-rising smoke collection chamber 61, it effectively collects smoke, preventing fumes from escaping upon contact with the smoke collection hood 6. Furthermore, because it rises upwards, it avoids being exposed at the bottom of the smoke collection hood 6, thus better concealing the lifting smoke machine.

[0039] The range hood also 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 component 31 and a first ventilation component 32. The second ventilation component 31 is disposed at the smoke inlet 62, while the first ventilation component 32 is disposed at the bottom of the second housing 12 and connected to the bottom of the second housing 12, thereby catching the oil flowing down from the inner wall of the second housing 12 and the fan system 2. The first ventilation component 32 and the second housing 12 can be directly or indirectly connected, either inside or outside the second housing 12. To ensure that the first ventilation component 32 can catch the oil flowing down from the inner wall of the second housing 12, when the connection position is inside the second housing 12, the first ventilation component 32 or an additionally arranged connector contacts the inner wall of the second housing 12; when the connection position is outside the second housing 12, the first ventilation component 32 or the additionally arranged connector at least partially covers the bottom edge of the second housing 12 in the horizontal projection. In this embodiment, the front and rear sides of the first ventilation component 32 are connected to the inner side of the second housing 12, while the left and right sides are connected to the lower side of the second housing 12. See [reference needed]. Figure 4 The connection point on the front side of the first ventilation component 32 is located on the rear side of the front wall of the second housing 12, and the two can be fixed by screws extending forward and backward. See also Figure 9 and Figure 10 The connection point on the right side of the first ventilation component 32 is located below the right side wall of the second housing 12 (a flange can be formed here), and the two can be fixed by screws extending vertically.

[0040] The second ventilation component 31 includes a second ventilation component body 311 and a second ventilation hole 312 formed on the second ventilation component body 311. In this embodiment, the second ventilation component body 311 is generally flat, and the second ventilation hole 312 is an elongated ventilation hole that extends back and forth, thus the second ventilation component 31 is configured as a grille. The first ventilation component 32 includes a first ventilation component body 321 and a first ventilation hole 322 formed on the first ventilation component body 321. The first ventilation component body 321 is correspondingly located above the second ventilation component body 311, and the first ventilation hole 322 is also an elongated ventilation hole that extends back and forth. To avoid oil dripping, the second ventilation hole 312 and the first ventilation hole 322 are arranged alternately, that is, the second ventilation hole 312 corresponds to the solid portion between two adjacent first ventilation holes 322, and the first ventilation hole 322 corresponds to the solid portion between two adjacent first ventilation holes 322. The first ventilation component 32's body 321 includes a first portion 3211 and a second portion 3212. The first ventilation hole 322 is formed on the first portion 3211, which is also generally flat. In this embodiment, both the first ventilation component 32 and the second ventilation component 31 are filters, but alternatively, they can be formed by opening holes in a plate.

[0041] The second ventilation hole 312 and the first ventilation hole 322 extend in the same direction. On the horizontal plane, the angle between the length direction of the first ventilation hole 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 filter layers are basically consistent. Furthermore, the grille orientation of the first ventilation component 32 can be consistent with or have a small angle with the air intake direction of the fan system 2. This allows the airflow to rise along a relatively stable path, reducing the significant air intake resistance caused by path changes, thus achieving airflow routing and reducing noise.

[0042] The effective total ventilation area projected onto the horizontal plane by the edge of each first ventilation hole 322 is ≥30,000 square millimeters, thereby satisfying the requirements of air volume, noise, and total pressure efficiency, and minimizing the resistance of the first ventilation component 32 to airflow.

[0043] The lifting and lowering of the first housing 11 can meet the needs of smoke collection during operation and concealment when not in operation. Moreover, through the above structure, the change of the distance between the second ventilation component 31 and the first ventilation component 32 can be achieved without setting up a separate motion mechanism, which simplifies the structure and reduces costs.

[0044] Therefore, the range hood can be in at least two states. The first state: the first housing 11 is in its highest position, at which point the second ventilation component 31 and the first ventilation component 32 are in close proximity. This close proximity 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 32 is d1, and d1 ≤ 20mm, preferably d1 ≤ 15mm. The smaller d1 is, the closer the two components can be when rising, resulting in a more compact overall structure. The minimum value of d1 can be 0, but considering the gaps in the actual structural design, a more preferred value is 3mm ≤ d1 ≤ 5mm. The distance between the first part 3211 and the second ventilation component 31 is defined as the length of the perpendicular line from any point on the first part 3211 to the plane of the second ventilation component body 311 facing the first ventilation component 32 (since the second ventilation component body 311 is flat, it can be considered as multiple parallel planes stacked together), and d1 is the maximum length among these perpendicular lines. 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 desired position. This is referred to as the second state. See [link to relevant documentation]. 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 projections of the lowest point of the first ventilation component 32 and the highest point of the second ventilation component 31 onto the vertical plane, and satisfies h > 15 mm, more preferably h > 20 mm. Since the second ventilation hole 312 and the first ventilation hole 322 are staggered, only when h is large enough can the turning angle of the airflow from the second ventilation component 31 to the first ventilation component 32 be small enough to allow more air to pass through the first ventilation hole 322. By selecting the above-mentioned h value, after the fumes pass through the second ventilation component 31, with a turning angle of less than 30°, at least half of the directional width of the first ventilation hole 322 can be used as an effective area for the fumes to pass through, ensuring the effective ventilation area between the first ventilation component 32 and the second ventilation component 31, thereby ensuring smooth air intake.

[0045] In the first state, when d1≤20mm, if both layers of mesh disclosed in the background technology are flat filter structures, then while ensuring that the noise level meets the comfort requirements, the flow rate is <6m³ / s. 3 / min, when d1≤15mm, flow rate<5 3 / min. It is evident that the flow rate is restricted at this point, which would prevent normal ventilation or significantly prolong the ventilation time, leading to malfunction. Therefore, the second part 3212 protrudes away from the second ventilation component 31 relative to the first part 3211, i.e., it protrudes upwards. This creates a larger gap between the first ventilation component 32 and the second ventilation component 31, providing space for airflow. This allows the airflow to enter this larger gap without abruptly turning as in other parts, instead smoothly turning and flowing upwards from the second part 3212 or its edge. This significantly reduces airflow resistance, ensuring normal ventilation and maintaining clean air in the kitchen.

[0046] Furthermore, by providing a raised second part 3212 to the first ventilation component 32, the air intake channel through which the range hood supplies oil fumes in the first state is enlarged at the raised position, thereby reducing the suction resistance at the moment of startup. As a result, the fan system 2 can start working simultaneously at the moment the distance between the two filter layers is enlarged, quickly removing oil fumes and preventing oil fumes from escaping at the moment of startup.

[0047] The vertical distance between the highest point of the second part 3212 and the reference plane containing the first part 3211 is d2, and d2 ≥ 5mm, thereby ensuring that the second part 3212 protrudes to a sufficient height to provide a sufficient flow area. Furthermore, considering the compactness of the entire unit, it is preferable that d2 ≤ 25mm. The aforementioned reference plane refers to the plane at the intersection of the first part 3211 and the second part 3212 (all points at the intersection are on the same plane).

[0048] An oil cup 4 is located at the rear bottom of the first housing 11. Both the second ventilation component 31 and the first ventilation component 32 extend gradually downwards from front to back to guide accumulated oil 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 fan system 2 extends forward and backward along its axis X, including a first intake 21 as the main intake and a second intake 22 as a secondary intake. The rearward orientation of the first intake 21 reduces the aerodynamic noise of the fan system 2, keeping it further away from human ears.

[0049] Correspondingly, the first part 3211 covers the outer periphery of the second part 3212 on the front, left, and right sides. A first air inlet 323 is formed on the body 321 of the first ventilation component, and the rear end of the second part 3212 forms one edge of the first air inlet 323. Thus, during ventilation and during fume extraction, air can flow upwards along the edge of the second part 3212 after passing through it. A third ventilation hole 324 can also be opened on the second part 3212 to increase the air intake area for air during ventilation and fume extraction. Moreover, the third ventilation hole 324 allows airflow to flow directly upwards from the second part 3212 when entering the larger space between the second ventilation component 31 and the first ventilation component 32, reducing energy loss caused by airflow turning.

[0050] The flow 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 of the lower surface of the first ventilation component 32, which can be a plane or a curved surface, with the rear edge of the first air inlet 323 taking the line connecting the left and right rear ends of the first part 3211 as a reference, see [reference]). Figure 5 The area of ​​the first intake 21 of the fan system 2 (shown by the dashed line) is s1, and the area of ​​the first intake 21 (the area enclosed by the edges of the first intake 21, usually the area enclosed by the air inlet ring on the volute of the fan system 2, the air inlet ring is the same as in the prior art, not marked in the figure) is s2, and s1 / s2≥30% is satisfied, thereby ensuring sufficient air exchange flow. When the option of opening a third ventilation hole 324 is selected, the total area of ​​the first air inlet 323 and the third ventilation hole 324 on the first ventilation component 32 (the area of ​​the third ventilation hole 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.

[0051] The second part 3212 can be shaped like an arch rising from the left and right sides towards the middle, with the middle arch forming the ridge 3213. The left and right sides of the ridge 3213 form the side parts 3214, and each side part 3214 gradually slopes downward away from the ridge 3213. The vertical distance between the projection of the ridge 3213 and the axis X of the fan system 2 onto the horizontal plane is d4 (measured at the midpoint of the ridge 3213 in the left-right direction), and satisfies d4≤D / 2, where D is the diameter of the first suction port 21. d4 represents the degree of deviation between the ridge 3212 and the axis X of the fan system 2. Therefore, satisfying d4≤D / 2 allows the ridge 3213 to correspond to the range of the first intake port 21 of the fan system 2. Thus, the shape adopted by the second part 3212, that is, arching from the left and right sides towards the middle to form a cavity, allows the oil fume airflow to converge from the left and right sides towards the middle along the second part 3212. After converging, it can be located within the range of the first intake port 21. That is, the design of the second part 3212 makes the oil fume convergence direction match the rear first intake port 21, so as to promote the oil fume flow to the first intake port 21.

[0052] Therefore, the first air inlet 323 and the first intake 21 of the fan system 2 work together. The protruding second part 3212 can guide the airflow to the first air inlet 323. The direction of the protrusion matches the direction of airflow, further reducing the suction resistance at the moment of startup. At the same time, the second part 3212 arches from the left and right sides towards the middle to form a cavity, so that the direction of convergence of the oil fume airflow (converging from the left and right sides towards the middle) matches the first intake 21 on the rear side (in the conventional fan arrangement, the fan intake is located in the middle or near the middle of the left and right sides). At the moment of startup, the first intake 21 and the first air inlet 323 are close to each other, and the oil fume gas can directly enter the first intake 21 on the rear side through the second part 3212 along the first air inlet 323. This greatly shortens the oil fume path, so that the oil fume can be quickly sucked in and discharged by the fan system 2, thereby improving the oil fume extraction efficiency.

[0053] The size of the second part 3212 affects the proportion of forward and backward flow of fumes after they reach 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 in a relatively horizontal direction. The depth of the second housing 12 is B', and the vertical distance between the projection of the front end of the second part 3212 and the rear sidewall of the second housing 12 on the horizontal plane is B1', and B1' / B'≥1 / 2 is satisfied. This makes the size of the second part 3212 as large as possible, covering a larger area, so that when the fumes rise, a larger proportion of the fumes pass through the second part 3212 and flow upward under the guidance of the second part 3212. Compared with the first part 3211, which has a larger inclination, the fumes guided by the second part 3212 can help to reduce the tendency of the fumes to flow forward along the first part 3211 and increase the tendency to flow backward, thereby increasing the proportion of fumes inhaled from the rear main intake. More preferably, the axis X of the fan system 2 extends horizontally front to back. In this case, the width of the second part 3212 and the width of the fan system 2 can be compared. The width of the fan system 2 is B, and the vertical distance between the projection of the front end of the second part 3212 and the first suction port 21 on the horizontal plane is B1, and B1 / B ≥ 2 / 3 is satisfied.

[0054] The ridge 3213 of the second part 3212 gradually slopes downward from front to back, with an angle α between it and the horizontal plane. The inclination angle between the first part 3211 and the horizontal plane is β, and α < β. This further promotes the diversion of oil fumes at the second part 3212. Since the first ventilation component 32 is inclined from front to back as a whole, and the first intake 21, as the main intake, faces the rear, the forward guiding direction of the first ventilation component 32 will be contrary to the rear air intake of the first intake 21, which is not conducive to air intake. By setting the second part 3212, since its ridge 3213 does not participate in oil guiding, the inclination angle can be smaller than that of the first part 3211, as mentioned above. This reduces the overall inclination of the first ventilation component 32 from front to back, guides most of the oil fumes to the rear, and reduces the impact of the inclination on the forward guiding of oil fumes, which is conducive to most of the oil fumes being diverted to the rear and entering the first intake 21. Furthermore, the placement of the first air inlet 323 or the third ventilation hole 324 can further guide the airflow to the rear. Additionally, the second part 3212 is integrally formed, and the end of its side portion 3214 away from the ridge 3213 is a certain distance from the left or right end of the first part 3211. Compared to extending directly from the ridge 3213 to the left and right side walls of the second housing 12, the shape of the second part 3212 allows for a greater inclination of the side portion 3214, which is beneficial for guiding the oil on the ridge 3213 and side portion 3214 to the left and right sides. Optionally, the ridge 3213 can also gradually slope upwards from front to back or extend horizontally from front to back, see [reference needed]. Figure 14This will better facilitate the flow of oil fumes to the rear. The preferred tilt angle is [0°, 65°]. More preferably, the tilt angle is n°, where n is any integer value within (0, 65). Alternatively, the tilt angle is [0°, n°], where n is any integer value within (0, 65). Or, the tilt angle is [n1°, n2°], where n1 and n2 are any integer values ​​within (0, 65).

[0055] To meet safety requirements, namely to prevent users or other installation and maintenance personnel from coming into contact with the fan system 2 through the first air inlet 323, and to ensure that the first air inlet 323 has sufficient flow area, the distance between the front edge of the first air inlet 323 and the rear side wall of the second housing 12 is d3, and d3≤50mm is satisfied.

[0056] 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 extends upward 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 connected to form an integral unit. The upper edge of the second air inlet 326 is arched from the left and right sides towards the middle. The apex 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 (corresponding here means corresponding in the left and right direction). The minimum distance between the apex 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 safety requirements and ensure sufficient flow area of ​​the second air inlet 326, d7 ≤ 50 mm.

[0057] The second part 3212, located at the edge of the first air inlet 323, has a first baffle 3219 formed therefrom, which is formed by bending the second part 3212 upwards. The first mounting part 325 has a forward-extending second baffle 3251 formed at the upper edge of the second air inlet 326.

[0058] The fan system 2 includes a volute 23, on which the aforementioned first intake 21 and second intake 22 are formed. An oil drip nozzle 24 is located at the lowest point 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 each other in the front-rear direction. In this embodiment, since the fan system 2 is a rear-intake system, the first end 3215 is the rear end, and the second end 3216 is the front end. In a horizontal projection, the first intake 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 portion 3212 is located between the first air inlet 323 and the second end 3216 of the first ventilation component body 321.

[0059] In the horizontal 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 the end of the volute 23 in the width direction also drips oil downwards, in the horizontal projection, the oil dripping part 231 corresponding to the end face of the volute 23 where the first suction port 21 is opened is located inside the second part 3212 to prevent the oil in the volute 23 from dripping vertically downwards at this point. In this embodiment, the oil dripping part 231 is the bottom of the end face of the volute 23; alternatively, it can also be an independent oil guiding component that is inclined forward and downward at the bottom of the end face.

[0060] Since the axis X of the fan system 2 extends in the front-to-back direction, the airflow speed is higher in the middle and lower on the left and right sides. If the oil is directly guided to the rear side, the higher airflow speed in the middle will cause the oil in the middle of the rear side to be blown up by the airflow and splash, which may then drip down onto the stovetop. Therefore, by setting up the raised second part 3212, the oil received is guided to the left and right sides of the rear part of the outer casing. The lower airflow speed guides the oil downward, preventing splashing, so that the oil can flow down the wall of the outer casing until it is collected in the oil cup 4.

[0061] Because the volute 23 is under positive pressure, a high-speed airflow will spray outward from the oil drip nozzle 24 at the bottom of the volute 23. In this case, if the first ventilation component 32 and the oil drip nozzle 24 are too close, the oil will splash laterally after dripping onto the first ventilation component 32. Since the first ventilation component 32 has openings and cannot block the splashing oil laterally, it will fail to collect the oil dripping from the fan system 2. Therefore, the portion of the first ventilation component body 321 of the first ventilation component 32 corresponding to the oil drip nozzle 24 is closed. 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 ≥ 8 mm. (See [reference]). Figure 13.

[0062] The width of the oil drip nozzle 24 is d12 (the dimension in the front-to-back direction). 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 has a minimum closed area of ​​π(d12 / 2+ctanγ). 2 γ is the angle between the line connecting any point on the edge of the oil drip nozzle 24 and any point on the body of the first ventilation component 321 and the vertical direction, and satisfies γ≥30°. Here, it is assumed that the oil drip nozzle 24 is circular.

[0063] See also Figure 2 The first ventilation component 32 also includes a second mounting portion 327 that bends upward from the front side of the first ventilation component body 321. A fourth ventilation hole 3271 is provided on the second mounting portion 327, which is closed at the position corresponding to the front side of the drip nozzle 24, and the bottom of the closed position is not lower than the lower end of the drip nozzle 24. The flow area of ​​the first ventilation hole 322 of the first ventilation component 32 is larger than the flow area of ​​the fourth ventilation hole 3271 (the definition of flow area is as for the first ventilation hole 322).

[0064] A first oil drain hole 3217 is formed at the first end 3215 of the first ventilation component body 321. In the horizontal projection, the distance between the first oil drain hole 3217 and the ridge 3213 is d5 (measured at the midpoint of the ridge 3213 in the left-right direction), and d5 ≥ 50 mm. This ensures that the first oil drain hole 3217 maintains a sufficient distance from the middle position of the fan system 2 where the wind speed is high, thus avoiding the influence of high-speed airflow on the oil. There may be two first oil drain holes 3217, corresponding to the two side portions 3214 of the second part 3212. The side portion 3214, away from the ridge 3213, extends to the first end 3215 of the first ventilation component body 3211. Thus, the portion of the side portion 3214 extending to the first end 3215 forms a transition position with the first end 3215, and the first oil drain hole 3217 may be formed at this transition position. On the vertical projection, the distance between the axis X of the fan system 2 and the first oil leakage hole 3217 is h1. When h1≤350mm, the center of the first suction port 21 of the fan system 2 and the first oil leakage hole 3217 are relatively close. Therefore, the distance between them will have a significant impact on the oil. At this time, (d5+d4) / h1=tanθ, θ≥10°. When h1>350mm, θ is not required. This reduces the interference of airflow on the oil dripping path on both sides and prevents the oil from drifting towards the center.

[0065] The first end 3215 of the first ventilation component body 321 also has a second oil leakage hole 3218. 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 that the oil on the first part 3211 of the first ventilation component body 321 is guided downward.

[0066] The side portion 3214 also gradually slopes downward from front to back, and its tilt angle relative to the horizontal plane is also β, so as to promote the flow of oil on the ridge portion 3213 to the side portion 3214.

[0067] See Figure 11 and Figure 12 The oil cup 4 mentioned above corresponds to the first end 3215 of the first ventilation component body 321. The width dimension of the upper end of the open oil cup 4 in the front-back direction is d6. 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 in the second state, (d6-d11) / d5≥0.1, so that the oil can flow into the oil cup 4 and will not drift forward to outside the range of the oil cup 4.

[0068] A control panel 5 is provided on the front side of the first housing 11. When the first housing 11 is lowered, it can be lowered to a height of about 450mm above the stove. The range hood also includes a back panel 13, which is located on the rear side of the first housing 11. The horizontal distance from the front side of the smoke hood 6 to the back panel 13 is 345-350mm. The thickness of the smoke hood 6 is ≤50mm.

[0069] The smoke collection chamber 61 is arched from both the front and rear sides towards the center, with its highest point close to the front side of the first housing 11. The depth of the smoke collection chamber 61 in the front-rear direction is S. The angle between the front wall of the smoke collection hood 6 and the horizontal direction is θ1, and the angle between the rear wall of the smoke collection hood 6 and the horizontal direction is θ2. To ensure the smoke collection effect of the smoke collection chamber 61, S ≥ 280 mm, θ1 ≥ 25°. To ensure the oil guiding function, θ2 ≥ 12° and the aforementioned β ( Figure 6 (as shown in the figure) ≥12°.

[0070] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter 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. This 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 channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood, comprising a housing, a fan system (2) disposed within the housing, and an oil cup (4) disposed at the bottom rear side of the housing, wherein the fan system (2) includes a rearward-facing first intake inlet (21), and a first ventilation component (32) is disposed below the fan system (2); characterized in that: The first ventilation component (32) includes a first ventilation component body (321) disposed below the corresponding fan system (2). The first ventilation component body (321) includes a first part (3211) that extends downward from front to back and a second part (3212) that protrudes upward relative to the first part (3211) as a ventilation hole. The second part (3212) has a spine (3213) and side parts (3214) located on the left and right sides of the spine (3213). The side parts (3214) gradually slope downward away from the spine (3213). The left end of the second part (3212) is located to the right of the left end of the first part (3211), and the right end of the second part (3212) is located to the left of the right end of the first part (3211).

2. The range hood according to claim 1, characterized in that: The ridge (3213) of the second part (3212) gradually slopes downward from front to back and the angle between it and the horizontal plane is α. The 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: The spine (3213) gradually slopes upward from front to back or extends horizontally from front to back.

4. The range hood according to claim 3, characterized in that: The angle between the ridge (3213) and the horizontal plane ranges from [0°, 65°].

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

6. The range hood according to claim 5, characterized in that: The axis (X) of the fan system (2) extends back and forth. A first oil leakage hole (3217) is formed at the rear end of the first ventilation component body (321). On the horizontal 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.

7. The range hood according to claim 6, characterized in that: The side portion (3214) of the second part (3212) of the first ventilation component body (321) extends 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 the transition position between the side portion (3214) of the second part (3212) and the rear end of the first ventilation component body (321).

8. The range hood according to claim 7, characterized in that: The rear end of the first ventilation component body (321) is also provided with a second oil leakage hole (3218). 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).

9. The range hood according to claim 6, characterized in that: On the horizontal projection, the vertical distance between the ridge (3213) and the axis (X) of the fan system (2) is d4. On the vertical projection, the distance between the axis (X) of the fan system (2) and the first oil leakage hole (3217) is h1. When h1≤350mm, (d5+d4) / h1=tanθ, and θ≥10°.

10. The range hood according to claim 1, characterized in that: On the horizontal projection, the vertical distance between the axis (X) of the ridge (3213) and the fan system (2) is d4, and satisfies d4≤D / 2, where D is the diameter of the first inlet (21).

11. The range hood according to claim 1, characterized in that: The bottom of the outer shell is recessed upward to form a smoke collection cavity (61). The depth of the smoke collection cavity (61) in the front-back direction is S. The angle between the wall of the outer shell forming the front side of the smoke collection cavity (61) and the horizontal direction is θ1, and satisfies: S≥280mm, θ1≥25°.

12. The range hood according to claim 11, characterized in that: The angle between the rear wall of the outer shell forming the smoke collection chamber (61) and the horizontal direction is θ2, and θ2≥12° is satisfied.

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