A range hood

Abstract

The utility model discloses a kind of range hood, including first shell, second shell and smoke collecting hood, the first shell is at least partially coated in the periphery of second shell and at least partially below second shell, the first shell can be up and down lifting movement relative to second shell;The front side of the first shell is provided with control panel, the interval between the front side of the first shell and the front side of second shell is less than the thickness of control panel located in the inner part of first shell, so that control panel is kept below second shell when the first shell is lifted, the smoke collecting hood is arranged on the first shell;The distance that the smoke collecting hood extends forward and exceeds the front side of first shell is a1, the vertical distance of the operating center of control panel to the top surface of smoke collecting hood is b2, the included angle of the connecting line of the operating center of control panel to the front side of smoke collecting hood and vertical direction is δ, tan δ=a1 / b2, and satisfy a1≥0mm, δ≤40 °.

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] Traditional top-mounted range hoods have large smoke collection hoods, and their excessive front and back dimensions make them unsuitable for kitchen cabinets. Users are also prone to bumping their heads during use. Furthermore, their excessive thickness makes the range hood bulky and takes up too much space in the cooking area.

[0004] Therefore, the applicant has designed a liftable, thin range hood, referring to a range hood disclosed in Chinese Patent Application No. 202010404880.4, which includes a movable part, a fixed part, and a motion mechanism for electrically driving the movable part to lift relative to the fixed part. The movable part includes a smoke collection hood, and the fixed part includes a fan frame.

[0005] Changing the working shape of a range hood can achieve both good smoke extraction during operation (closer to the smoke source when lowered) and a clean and aesthetically pleasing appearance when off. For aesthetic reasons, the control panel is usually placed in the middle of the lower housing (even if the lower housing is wide). When the upper and lower housings are of equal width, the portion of the control panel in the lower housing will inevitably overlap with the upper housing in the front-to-back direction during the lowering and lowering process. For slim range hoods, the front-to-back depth of the upper and lower housings is similar. Therefore, the thickness of the control panel in the lower housing limits its ability to fit into the gap between the nested upper and lower housings. Thus, the installation height of the control panel on the lower housing affects the compactness of the entire unit when raised. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a range hood that balances the oil fume extraction effect, user operation and overall compactness, in order to address the shortcomings of the existing technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a range hood, including a first housing, a second housing and a smoke collection hood, wherein the first housing at least partially covers the outer periphery of the second housing and is at least partially located below the second housing, and the first housing can move up and down relative to the second housing;

[0008] The range hood further includes a second ventilation component and a first ventilation component disposed on the second housing; characterized in that:

[0009] A control panel is provided on the front side of the first housing. The distance between the front side of the first housing and the front side of the second housing is less than the thickness of the portion of the control panel located inside the first housing, so that the control panel remains below the second housing when the first housing is raised or lowered. The smoke hood is provided on the first housing, and a smoke inlet is formed on the smoke hood. The first ventilation component is provided at the smoke inlet.

[0010] The distance by which the smoke hood extends forward beyond the front side of the first housing is a1, and the vertical distance from the operation center of the control panel to the bottom of the first housing is b2. On the vertical plane extending forward and backward, the angle between the line connecting the operation center of the control panel to the front side of the smoke hood and the vertical direction is δ, tanδ=a1 / b2.

[0011] The range hood can be in a non-working state where the first housing is raised relative to the second housing. At this time, the overall height of the range hood is H0, and H0 = H1 + H2, where H1 is the height of the second housing, H2 is the height of the first housing and the smoke hood together located below the second housing, and H2 = b1 + b2 + b3 + h2 + a, where b1 is the height from the operating center of the control panel to the bottom of the second housing, b3 is the height from the bottom surface of the smoke hood to the top of the control panel located inside the first housing, b3 is the height from the bottom surface of the smoke hood to the bottom of the first housing, a is the installation gap between the top of the control panel located inside the first housing and the bottom of the front side wall of the second housing, and h2 is the thickness of the smoke hood.

[0012] The above parameters satisfy a1≥0mm, δ≤40°;

[0013] The first ventilation component and at least part of the second ventilation component are located between the bottom of the front sidewall of the second housing and the bottom of the first housing.

[0014] Because the thickness of the control panel prevents it from entering the space between the first and second housings when the first housing is raised or lowered, the overall height of the unit in its non-working state is constrained by the clearance dimension of the control panel. This clearance dimension is influenced by the width of the smoke hood extending beyond the front of the first housing, which affects the user experience when operating the buttons on the control panel. Therefore, it is necessary to select appropriate parameters for the control panel's operating center and the width of the smoke hood extending beyond the first housing to avoid the smoke hood interfering with the user's operation of the control panel buttons, while also avoiding an excessively large overall height of the first housing. This achieves the optimal balance between smoke extraction, user operation, and overall compactness. Furthermore, since top-mounted range hoods require a double-layer mesh to prevent oil dripping, this invention places the double-layer mesh within the clearance space created by the control panel, fully utilizing this space while also meeting the oil path requirements.

[0015] For ease of operation, the widths of the first and second housings are adapted in the left-right direction, and the control panel is located directly in front of the second housing.

[0016] Preferably, in order to make the whole machine thin and light, the thickness of the smoke collection hood is h2, and the value of h2 is in the range of 20 to 30 mm.

[0017] Furthermore, to prevent cooking fumes from affecting the normal operation of the control panel, the range hood also includes a partition that isolates the control panel and the smoke inlet.

[0018] Furthermore, to facilitate the filtration of oil fumes and the collection of oil flowing down from the second housing or the fan system, the first ventilation component and the second ventilation component are disposed at the bottom of the second housing or inside the second housing.

[0019] Preferably, the first ventilation component includes a first ventilation component body and a first ventilation hole opened on the first ventilation component body, the first ventilation component body extending downward gradually from front to back; the second ventilation component includes a second ventilation component body and a second ventilation hole opened on the second ventilation component body, the second ventilation component body including a first part extending downward gradually from front to back.

[0020] The range hood can be in a state where the first housing is raised so that the first ventilation component and the second ventilation component are close together. In this state, the maximum distance between the first part of the second ventilation component and the first ventilation component body of the first ventilation component is d1, and satisfies 3mm≤d1≤5mm. This allows the first housing and the second housing to be as close as possible when not in operation, thereby further improving the compactness of the whole machine when not in operation.

[0021] Furthermore, the second ventilation component body of the second ventilation component also includes a second part that protrudes away from the first ventilation component relative to the first part. The vertical distance between the highest point of the second part and the reference plane where the first part is located is d2, and d2≥5mm is satisfied. By setting the second part, the air intake resistance can be reduced, thereby increasing the air intake volume or meeting other needs, such as ventilation in non-working state.

[0022] To further improve the overall compactness of the machine, d2 also satisfies the following relationship: d2≤25mm.

[0023] Furthermore, the range hood also includes a fan system at least partially disposed within the second housing. The second ventilation component includes a second ventilation component body and a second ventilation hole opened on the second ventilation component body. The second ventilation component body is located below the second housing, and the bottom of the fan system is lower than the bottom of the second housing. This allows the fan system to be positioned lower to reduce the negative pressure zone and improve the smoke extraction effect.

[0024] Furthermore, the second ventilation component is connected to the bottom of the second housing, thereby facilitating the second ventilation component to receive oil flowing down the wall of the second housing.

[0025] Compared with the prior art, the advantages of this utility model are as follows: As the range hood rises, the upper and lower mesh layers approach each other. When the range hood rises to its highest position, the overall height of the range hood is at its minimum. The control panel is generally installed on the first housing. Since the thickness of the control panel on the first housing is greater than the gap between the front sides of the two housings, the installation height of the control panel limits the distance the range hood can rise, which limits the compactness of the entire unit after the range hood rises. Furthermore, due to the presence of the smoke collection hood, the control panel must be installed at a certain height on the first housing for easy user operation. Therefore, this patent determines the installation height of the control panel's operating center by establishing a correlation between the dimensional parameters of the smoke collection hood extending beyond the first housing width and the dimensional parameters of the smoke collection hood at the control panel's operating center installation height. This avoids the smoke collection hood interfering with the user's operation of the control panel buttons, while also preventing the total height of the first housing from being too large. Consequently, the smoke extraction effect, user operation, and overall machine height are optimized. Furthermore, since top-mounted range hoods require a double-layer mesh to prevent oil dripping, this invention places the double-layer mesh within the clearance space created by the control panel, making full use of this space while meeting the oil path requirements. Attached Figure Description

[0026] Figure 1 This is a schematic diagram (first state) of a range hood according to an embodiment of the present utility model;

[0027] Figure 2This is an exploded structural diagram of the range hood according to an embodiment of the present utility model;

[0028] Figure 3 This is a front sectional view (first state, front and rear section) of the range hood according to an embodiment of the present utility model;

[0029] Figure 4 This is a three-dimensional structural cross-sectional view (first state, compared with) an embodiment of the range hood of this utility model. Figure 3 (The cross-section is parallel);

[0030] Figure 5 for Figure 4 A magnified schematic diagram of part I;

[0031] Figure 6 This is a schematic diagram of the second ventilation component of the range hood according to an embodiment of the present utility model;

[0032] Figure 7 This is a cross-sectional view (front and rear section) of the second ventilation component of the range hood according to an embodiment of the present utility model;

[0033] Figure 8 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);

[0034] Figure 9 This is a schematic diagram of the concealed second housing portion, the first housing, the first ventilation component, and the oil cup of the range hood according to an embodiment of the present utility model;

[0035] Figure 10 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;

[0036] Figure 11 for Figure 10 A magnified schematic diagram of part II; Figure 12 This is a schematic diagram (second state) of a range hood according to an embodiment of the present utility model;

[0037] Figure 13 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;

[0038] Figure 14 for Figure 13 A magnified schematic diagram of part III;

[0039] Figure 15 This is a cross-sectional view (first state, front-to-back section) of an alternative embodiment of the range hood of this utility model. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 first ventilation component 31 and a second ventilation component 32. The first ventilation component 31 is disposed at the smoke inlet 62, while the second ventilation component 32 is disposed at the bottom of the second housing 12. Preferably, the second ventilation component 32 is connected to the bottom of the second housing 12 to collect oil flowing from the inner wall of the second housing 12 and the fan system 2. The second ventilation component 32 and the second housing 12 can be directly or indirectly connected; they can be connected inside or outside the second housing 12. To ensure that the second ventilation component 32 can collect oil flowing down the inner wall of the second housing 12, when the connection point is inside the second housing 12, the second ventilation component 32 or the additionally arranged connector contacts the inner wall of the second housing 12; when the connection point is outside the second housing 12, the second ventilation component 32 or the additionally arranged connector at least partially covers the bottom edge of the second housing 12 in its horizontal projection. In this embodiment, the front and rear sides of the second 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 5 The connection point on the rear side of the second ventilation component 32 is located on the front side of the rear 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 second 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.

[0045] The first ventilation component 31 includes a first ventilation component body 311 and a first ventilation hole 312 formed on the first ventilation component body 311. In this embodiment, the first ventilation component body 311 is generally flat, and the first ventilation hole 312 is an elongated mesh extending forward and backward, thus the first ventilation component 31 is configured as a grid. The second ventilation component 32 includes a second ventilation component body 321 and a second ventilation hole 322 formed on the second ventilation component body 321. The second ventilation component body 321 is correspondingly located above the first ventilation component body 311 and below the second housing 12. The second ventilation hole 322 is also an elongated mesh extending forward and backward. To avoid oil dripping, the first ventilation hole 312 and the second ventilation hole 322 are arranged alternately, that is, the first ventilation hole 312 corresponds to the solid portion between two adjacent second ventilation holes 322, and the second ventilation hole 322 corresponds to the solid portion between two adjacent second ventilation holes 322. The second ventilation component 32's second ventilation component body 321 includes a first part 3211 and a second part 3212. The aforementioned second ventilation hole 322 is opened on the first part 3211, which is also generally flat.

[0046] The first ventilation hole 312 and the second ventilation hole 322 extend in the same direction. On the horizontal plane, the angle between the length direction of the second ventilation hole 322 and the axis X of the fan system 2 is ≤45°. Since both the first ventilation component 31 and the second ventilation component 32 are grilles, the grille orientations of the two filter layers are basically consistent. Furthermore, the grille orientation of the second ventilation component 32 can be consistent with the air intake direction of the fan system 2 or have a small angle with it. This allows the airflow to rise along a relatively stable path, reducing the significant air intake resistance caused by path changes, thus playing a role in airflow management and noise reduction. In this embodiment, both the first ventilation component 31 and the second ventilation component 32 are filters; alternatively, they can be formed by openings in a plate.

[0047] 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 first ventilation component 31 and the second ventilation component 32 can be achieved without setting up a separate motion mechanism, which simplifies the structure and reduces costs.

[0048] Therefore, the range hood can be in at least two states. The first state: the first housing 11 is at its highest position, at which point the first ventilation component 31 and the second ventilation component 32 are in close proximity. This close proximity means that the maximum distance between the first part 3211 of the second ventilation component body 321 of the second ventilation component 32 and the first ventilation component 31 is d1, and d1 ≤ 20mm, preferably d1 ≤ 15mm. The smaller d1 is, the closer the two 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 first ventilation component 31 is defined as the length of the perpendicular line from any point on the first part 3211 to the plane containing the first ventilation component body 311 facing the second ventilation component 32 (since the first 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 first ventilation component 31 and the second 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 12 and Figure 13In this state, the minimum vertical distance between the second ventilation component 32 and the first ventilation component 31 is h. This distance is the distance between the projections of the lowest point of the second ventilation component 32 and the highest point of the first ventilation component 31 onto the vertical plane, and satisfies h > 15 mm, more preferably h > 20 mm. Since the first ventilation hole 312 and the second ventilation hole 322 are staggered, only when h is large enough can the turning angle of the airflow from the first ventilation component 31 to the second ventilation component 32 be small enough to allow more air to pass through the second ventilation hole 322. By selecting the above-mentioned h value, after the fumes pass through the first ventilation component 31, with a turning angle of less than 30°, at least half of the width of the second ventilation hole 322 can be used as an effective area for the fumes to pass through, ensuring the effective ventilation area between the second ventilation component 32 and the first ventilation component 31, thereby ensuring smooth air intake.

[0049] 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 first ventilation component 31 relative to the first part 3211, i.e., it protrudes upwards. This creates a larger gap between the second ventilation component 32 and the first 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.

[0050] Furthermore, by providing a raised second part 3212 in the second 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 sucking up the oil fumes and preventing the oil fumes from escaping at the moment of startup.

[0051] 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).

[0052] An oil cup 4 is provided at the rear bottom of the first housing 11. The first ventilation component 31 and the second ventilation component 32 both extend gradually downwards from front to back to guide accumulated oil stains into the oil cup 4. In the oil fume flow path, the fan system 2 is located downstream of the second ventilation component 32. The axis X of the fan system 2 extends forward and backward, 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 the listener's ears.

[0053] 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 second 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 first ventilation component 31 and the second ventilation component 32, reducing energy loss caused by airflow turning.

[0054] The flow area of ​​the first air inlet 323 on the second ventilation component 32 (the area enclosed by the edge of the first air inlet 323 and the corresponding position of the lower surface of the second ventilation component 32, which can be a plane or a curved surface; the rear edge of the first air inlet 323 is based on the line connecting the left and right rear ends of the first part 3211, see reference). Figure 5The 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, which is the same as in the prior art and not marked in the figure) is s2, and s1 / s2≥30% is satisfied to ensure sufficient air exchange flow. When the option of opening a third ventilation hole 324 is selected, the total area of ​​the first intake 323 and the third ventilation hole 324 on the second 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.

[0055] 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 horizontal distance between the projection of the ridge 3213 and the axis X of the fan system 2 onto the horizontal plane is d4 (measured with the ridge 3213 at its midpoint in the left and right directions as the reference), 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.

[0056] 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.

[0057] 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.

[0058] 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 angle of inclination of the first part 3211 with the horizontal plane is β, and α < β. This further promotes the diversion of oil fumes at the second part 3212. Since the second ventilation component 32 is tilted 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 second ventilation component 32 will be contrary to the rearward 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 tilt angle can be smaller than that of the first part 3211, as mentioned above. This reduces the overall tilt of the second ventilation component 32 from front to back, guides most of the oil fumes to the rear, and reduces the impact of tilt 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 provision of the first air inlet 323 or the third ventilation hole 324 can further guide the airflow to the rear. In addition, the second part 3212 is integrally formed, and the end of its side portion 3214 away from the ridge portion 3213 is at a certain distance from the left or right end of the first part 3211. Compared with the shape of the second part 3212 extending directly from the ridge portion 3213 to the left and right side walls of the second housing 12, the shape of the second part 3212 of this utility model allows the side portion 3214 to have a greater inclination, which is beneficial for guiding the oil on the ridge portion 3213 and the side portion 3214 to the left and right sides.

[0059] The second ventilation component 32 further includes a first mounting portion 325 for mounting the second ventilation component body 321 to the second housing 12. The first mounting portion 325 extends upward from the rear end of the second 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 of the upper edge of the second air inlet 326 corresponds to the ridge 3213 in the middle of the second part 3212 of the second ventilation component 32 (corresponding here means corresponding in the left and right direction).

[0060] 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.

[0061] 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 second ventilation component 32 has a second ventilation component body 321 with 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-entry 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 second ventilation component body 321.

[0062] 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.

[0063] 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.

[0064] 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 second ventilation component 32 and the oil drip nozzle 24 are too close, the oil will splash laterally after dripping onto the second ventilation component 32. Since the second 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 second ventilation component body 321 of the second ventilation component 32 corresponding to the oil drip nozzle 24 is closed. The vertical distance between the oil drip nozzle 24 and the second ventilation component body 321 of the second ventilation component 32 is c, and c ≥ 8 mm. (See [reference]). Figure 14 .

[0065] The width of the oil drip nozzle 24 is d12 (the dimension in the front-to-back direction). The part of the second ventilation component body 321 of the second 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 drip nozzle 24 and any point on the body of the second ventilation component 321 and the vertical direction, and satisfies γ≥30°. Here, it is assumed that the drip nozzle 24 is circular.

[0066] See also Figure 2 The second ventilation component 32 also includes a second mounting portion 327 that bends upward from the front side of the second 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 second ventilation hole 322 of the second ventilation component 32 is larger than the flow area of ​​the fourth ventilation hole 3271 (the definition of flow area is as for the second ventilation hole 322).

[0067] A first oil drain hole 3217 is formed at the first end 3215 of the second ventilation component body 321. Projected on a horizontal plane, 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 sides 3214 of the second part 3212. The side of the side 3214 away from the ridge 3213 extends to the first end 3215 of the second ventilation component body 321, and the first oil drain hole 3217 may be formed at the transition position between the side 3214 and the first end 3215. 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, θ≥10°; when h1>350mm, θ can be left unrequired, thereby reducing the interference of airflow on the oil dripping path on both sides and preventing the oil from drifting towards the center.

[0068] The first end 3215 of the second 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 second ventilation component body 321 is guided downward.

[0069] 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.

[0070] See Figure 12 and Figure 13 The oil cup 4 mentioned above corresponds to the first end 3215 of the second 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 second 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.

[0071] A control panel 5 is provided on the front side of the first housing 11. The distance between the front side of the first housing 11 and the front side of the second housing 12 is less than the thickness of the portion of the control panel 5 located inside the first housing 11, so that the control panel 5 remains below the second housing 12 when the first housing 11 is raised or lowered. The smoke hood 6 extends forward beyond the front side of the first housing 11 by a distance a1. The vertical distance from the operating center of the control panel 5 to the top surface of the smoke hood 6 is b2. Here, "operating center" refers to the center of the pattern formed by buttons, touch screens, etc., on the front surface of the first housing 11. "Center" refers to the horizontal line where the geometric center of the pattern is located. When there are multiple buttons, the horizontal line where the lowest center of the multiple button centers is located is used as the reference. When the buttons are raised relative to the first housing 11, the horizontal line is used as the reference for the pattern formed by their projections on the front surface of the first housing 11. The axis X of the fan system 2 is located in the vertical plane S extending forward and backward (see...). Figure 4 As shown, the vertical plane S is also Figure 3 On a plane parallel to the paper, on the vertical plane S or a plane parallel to the vertical plane S, the angle between the line connecting the operating center of the control panel 5 to the front side of the smoke hood 6 and the vertical direction is δ, tanδ=a1 / b2. When the range hood is in a non-working state where the first housing 11 is raised relative to the second housing 12, the overall height of the range hood is H0, and H0=H1+H2, where H1 is the height of the second housing 12, H2 is the height at which the first housing 11 and the smoke hood 6 are both located below the second housing 12, and H2=b1+b2+b3+h2+a, where b1 is the height from the operating center of the control panel 5 to the top of the part of the control panel 5 located inside the first housing 11, b3 is the height from the bottom surface of the smoke hood 6 to the bottom of the first housing 11, and so on. Figure 3 As shown in the diagram, b3 = 0. At this time, the smoke inlet 62 can be formed by recessing upwards from the bottom surface of the smoke collection hood 6 into the first housing 11. (The last sentence appears to be incomplete and possibly refers to a different context.) Figure 15 As shown, the smoke hood 6 is not located at the bottom of the first housing 11. In this case, b3 > 0, and the smoke inlet 62 is formed by the downward indentation of the bottom surface of the first housing 11. h2 is the thickness of the smoke hood 6, and a is the installation gap between the top of the control panel 5 located inside the first housing 11 and the bottom of the front side wall of the second housing 12 (theoretically, there may be no gap between them, i.e., a = 0, but due to manufacturing, installation, and other limitations, there will be a certain gap between them). a is usually ≤ 10 mm. The following relationship is also satisfied: a1 ≥ 0 mm, δ ≤ 40°. When a1 = 0, that is, the front end of the smoke hood 6 is flush with the front end of the first housing 11.

[0072] When the first housing 11 descends, it can drop to a height of approximately 450mm above the cooktop. The range hood also includes a back panel 13, located on the rear side of the first housing 11. The horizontal distance from the front of the smoke hood 6 to the back panel 13 is 345–350mm. The thickness h2 of the smoke hood 6 is 20–30mm.

[0073] When the first housing 11 is raised or lowered, the thickness of the control panel 5 prevents it from entering the space between the first housing 11 and the second housing 12. With a fixed height for both the second housing 12 and the control panel 5, the overall height of the unit is constrained by the clearance dimension (b1+b2) of the control panel 5. This clearance dimension is affected by the width of the smoke hood 6 extending beyond the front of the first housing 11. This width affects the user's experience when operating the buttons on the control panel 5. Therefore, it is necessary to select appropriate operating center parameters for the control panel 5 and the width of the smoke hood 6 extending beyond the first housing 11, such that a1≥0mm and δ≤40°. This avoids the smoke hood 6 interfering with the user's operation of the buttons on the control panel 5, while also avoiding an excessively large overall height for the first housing 11 (making the overall height of the unit more compact when not in operation). This ensures that the fume extraction effect, user operation, and overall compactness are optimal.

[0074] The widths of the first housing 11 and the second housing 12 are matched in the left-right direction, and the control panel 5 is located directly in front of the second housing 12. The width d13 of the first housing 11 is 510-530mm. The range hood also includes a partition 15 extending upward from the front edge of the smoke inlet 62, which separates the control panel 5 from the smoke inlet 62.

[0075] See also Figure 3 When the range hood is in the first state, the vertical distance between the upper end of the first ventilation component 31 and the second ventilation component 32 is S2, and the vertical distance between the lowest end of the second ventilation component 32 and the bottom of the first housing 11 is S3. The smoke collection chamber 61 is arched from both the front and rear sides towards the middle, 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 forming the smoke collection chamber 61 and the horizontal direction is θ1, and the angle between the rear wall of the smoke collection hood 6 forming the smoke collection chamber 61 and the horizontal direction is θ2. To ensure the smoke collection effect of the smoke collection chamber 61, S≥280mm, θ1≥25°. To ensure the oil guiding function, θ2≥12° and the above-mentioned β( Figure 7 (as shown in the figure) ≥12°.

[0076] 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 first housing (11), a second housing (12) and a smoke collection hood (6), wherein 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), and the first housing (11) is capable of moving up and down relative to the second housing (12); The range hood further includes a second ventilation component (32) and a first ventilation component (31) disposed on the second housing (12); characterized in that: A control panel (5) is provided on the front side of the first housing (11). The distance between the front side of the first housing (11) and the front side of the second housing (12) is less than the thickness of the part of the control panel (5) located inside the first housing (11). Thus, when the first housing (11) is raised or lowered, the control panel (5) remains below the second housing (12). The smoke hood (6) is provided on the first housing (11). A smoke inlet (62) is formed on the smoke hood (6). The first ventilation component (31) is provided at the smoke inlet (62). The smoke hood (6) extends forward beyond the front side of the first housing (11) by a distance a1, and the vertical distance from the operation center of the control panel (5) to the top surface of the smoke hood (6) is b2. On the vertical plane extending forward and backward, the angle between the line connecting the operation center of the control panel (5) to the front side of the smoke hood (6) and the vertical direction is δ, tanδ=a1 / b2; The range hood can be in a non-working state where the first housing (11) is raised relative to the second housing (12). At this time, the overall height of the range hood is H0, and H0 = H1 + H2, where H1 is the height of the second housing (12), H2 is the height of the first housing (11) and the smoke hood (6) together located below the second housing (12), and H2 = b1 + b2 + b3 + h2 + a, where b1 is the height from the operation center of the control panel (5) to the top of the control panel (5) located inside the first housing (11), b3 is the height from the bottom surface of the smoke hood (6) to the bottom of the first housing (11), a is the installation gap between the top of the control panel (5) located inside the first housing (11) and the bottom of the front side wall of the second housing (12), and h2 is the thickness of the smoke hood (6). The above parameters satisfy a1≥0mm, δ≤40°; The first ventilation component (31) and at least part of the second ventilation component (32) are located between the bottom of the front sidewall of the second housing (12) and the bottom of the first housing (11).

2. The range hood according to claim 1, characterized in that: The widths of the first housing (11) and the second housing (12) are adapted in the left-right direction, and the control panel (5) is located directly in front of the second housing (12).

3. The range hood according to claim 1, characterized in that: b3 = 0, and the smoke hood satisfies that h2 is in the range of 20-30mm.

4. The range hood according to claim 1, characterized in that: The range hood also includes a partition (15) that separates the control panel (5) and the smoke inlet (62).

5. The range hood according to claim 1, characterized in that: The first ventilation component (32) is disposed at the bottom of the second housing (12) or inside the second housing (12).

6. The range hood according to claim 5, characterized in that: The first ventilation component (31) includes a first ventilation component body (311) and a first ventilation hole (312) opened on the first ventilation component body (311). The first ventilation component body (311) extends downward gradually from front to back. The second ventilation component (32) includes a second ventilation component body (321) and a second ventilation hole (322) opened on the second ventilation component body (321). The second ventilation component body (321) includes a first portion (3211) extending downward gradually from front to back. The range hood can be at least in a state where the first housing (11) is raised so that the first ventilation component (31) and the second ventilation component (32) are close together. In this state, the maximum distance between the first part (3211) of the second ventilation component (32) and the first ventilation component body (311) of the first ventilation component (31) is d1, and satisfies 3mm≤d1≤5mm.

7. The range hood according to claim 6, characterized in that: The second ventilation component body (321) of the second ventilation component (32) further includes a second part (3212) that protrudes away from the first ventilation component (31) relative to the first part (3211). The vertical distance between the highest point of the second part (3212) and the reference plane where the first part (3211) is located is d2, and d2≥5mm is satisfied.

8. The range hood according to claim 7, characterized in that: d2 also satisfies the following relationship: d2≤25mm.

9. The range hood according to claim 5, characterized in that: The range hood also includes a fan system (2) at least partially disposed within the second housing (12). The second ventilation component (32) includes a second ventilation component body (321) and a second ventilation hole (322) opened on the second ventilation component body (321). The second ventilation component body (321) is located below the second housing (12), and the bottom of the fan system (2) is lower than the bottom of the second housing (12).

10. The range hood according to claim 9, characterized in that: The second ventilation component (32) is connected to the bottom of the second housing (12).

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