A range hood

Abstract

This utility model discloses a range hood, including a housing and a ventilation assembly. The ventilation assembly includes a first ventilation component and a second ventilation component disposed within the housing. The first ventilation component includes a first ventilation component body and a first ventilation hole formed on the first ventilation component body. The second ventilation component includes a second ventilation component body correspondingly disposed above the first ventilation component and a second ventilation hole formed on the second ventilation component body. The first ventilation hole and the second ventilation hole are arranged alternately. The second ventilation component body includes a first part and a second part. The second ventilation hole is formed on the first part. The second part protrudes relative to the first part in a direction away from the first ventilation component, thereby allowing airflow to flow upward from the second part or the edge of the second part. The range hood can be in at least the following first state: the first part is in close proximity to the first ventilation component body of the first ventilation component.

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] The changing working shape of a range hood can achieve both good smoke extraction during operation (by lowering it closer to the smoke source) and a simple and aesthetically pleasing appearance when off. Top-mounted range hoods typically have two layers of filters; see the appendix of the aforementioned patent for details. Figure 4 As shown, however, this method cannot simultaneously meet the needs of both the oil supply and airflow:

[0006] 1. Oil circuit: The two filter screens need to be staggered, and the vertical projection of the two filter screens can seal the air inlet. At the same time, the distance between the two screens should not be too far.

[0007] 2. Air volume: To meet the requirements of large air volume and noise, sufficient effective air intake area is required. This requires that the mesh of the filter be loose and that the two layers of filter be kept at a certain distance.

[0008] As can be seen from the above, there is a contradiction between the requirements of the oil circuit and the air volume on the two-layer filter. To address this, the applicant has also designed a liftable range hood, referring to the liftable range hood disclosed in Chinese Patent Application No. 202321372669.4. This range hood includes a fan frame, a fume extraction fan installed inside the fan frame, an outer casing installed outside the fan frame, a smoke collection hood installed at the bottom of the outer casing, a smoke inlet on the smoke collection hood, a first plate installed at the bottom of the fan frame, and a second plate installed at the smoke inlet. When the outer casing is raised, the first and second plates overlap to close the smoke inlet; when the outer casing is lowered, a smoke inlet channel is formed between the first and second plates.

[0009] While this type of range hood can address the airflow requirements during operation and the oil flow issues when not in use, kitchens typically require ventilation during non-cooking periods. However, in its non-operational state, the gap between the two mesh layers (panels) is too small. Airflow entering between the mesh layers must abruptly change direction within this confined space, resulting in significant flow loss and insufficient airflow energy to escape, thus failing to achieve ventilation. Furthermore, when the range hood switches from non-operation to operation, the small gap between the mesh layers causes the fan to whistle during the initial lifting and lowering process. The fan can only start after the gap between the layers has increased to a certain extent, and this waiting period prevents the intake of fumes, causing them to escape. Utility Model Content

[0010] The first technical problem to be solved by this utility model is to provide a range hood that can ensure ventilation, addressing the shortcomings of the existing technology.

[0011] The second technical problem to be solved by this utility model is to provide a range hood that reduces the resistance at the moment of startup, quickly removes oil fumes, and reduces the escape of oil fumes, in order to address the shortcomings of the existing technology.

[0012] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: a range hood, comprising a housing and a ventilation assembly, wherein the ventilation assembly includes a first ventilation component and a second ventilation component disposed within the housing, the first ventilation component comprising a first ventilation component body and a first ventilation hole formed on the first ventilation component body, the second ventilation component comprising a second ventilation component body correspondingly disposed above the first ventilation component and a second ventilation hole formed on the second ventilation component body, the first ventilation hole and the second ventilation hole being arranged alternately; characterized in that:

[0013] The second ventilation component body includes a first part and a second part. The second ventilation hole is opened on the first part. The second part protrudes away from the first part relative to the first part, so that airflow can flow upward from the second part or the edge of the second part.

[0014] The range hood can be in at least the following first state: the first part is in close contact with the body of the first ventilation component of the first ventilation component.

[0015] By creating a raised portion in the second ventilation component, the second ventilation component is not completely fitted to the first ventilation component. Even when the two layers of filters are close together and airflow is restricted due to the interlacing of the mesh, the larger gap formed between the raised portion of the second ventilation component and the corresponding portion of the first ventilation component provides space for air circulation. This facilitates ventilation even when the unit is off, keeping the indoor air in the kitchen clean.

[0016] Furthermore, in the first state, the maximum distance between the first part and the body of the first ventilation component is d1, and satisfies d1≤20mm, or d1≤15mm, or 3mm≤d1≤5mm. In this state, the air exchange flow rate will be greatly limited, but the ventilation function can be normally realized through the protrusion of the second ventilation component.

[0017] The technical solution adopted by this utility model to solve the second technical problem mentioned above is that one of the second ventilation component and the first ventilation component can be raised or lowered relative to the other.

[0018] Because the distance between the first and second ventilation components is small when the range hood is off, the fan will whistle when the range hood is turned on due to the small gap between the two layers of mesh. Therefore, the fan can only start after the distance between the two layers of filter reaches a certain level, which will cause the oil fumes to escape because they cannot be sucked in. In this utility model, by setting a protruding part, the air intake channel is enlarged at the protrusion when the range hood is off, which can reduce the suction resistance at the moment of startup. Thus, the fan can start working simultaneously the moment the distance between the two layers of filter expands, and quickly suck up the oil fumes.

[0019] Furthermore, the outer casing includes a first housing, a second housing, and a smoke collection hood disposed at the bottom of the first housing. The smoke collection hood has a smoke inlet. The first housing at least partially covers the outer periphery of the second housing and is at least partially located below the second housing. The first housing is movable relative to the second housing. The first ventilation component is disposed at the smoke inlet, and the second ventilation component is disposed on the second housing. The movable first housing satisfies the requirements for smoke collection and concealment, while the first ventilation component moves with the first housing, eliminating the need for a separate movement mechanism and thus simplifying the structure.

[0020] Furthermore, the first state is the state in which the first ventilation component is raised; the range hood can also be in the second state in which the first ventilation component is lowered: the minimum vertical distance between the second ventilation component and the first ventilation component is h, and h > 20 mm, thereby enabling the range hood to form a sufficiently deep air intake channel between the first ventilation component and the second ventilation component in the fume extraction working state where the first housing is lowered, so as to meet the air volume requirements.

[0021] Furthermore, the 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, thereby ensuring that the second part has sufficient bulge height to meet sufficient flow area.

[0022] Furthermore, a fan system is also provided inside the housing. In the oil fume flow path, the fan system is located downstream of the second ventilation component. The axis of the fan system extends back and forth. The fan system includes at least a first intake port facing the rear.

[0023] The second ventilation component has a first air inlet formed on its body, and the rear end of the second part forms one side edge of the first air inlet.

[0024] Therefore, the first air inlet on the second ventilation component and the first suction inlet of the fan work together. The protrusion can guide the airflow to the first air inlet. 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 protrusion makes the convergence direction of the oil fume airflow match the first suction inlet of the fan on the rear side. At the moment of startup, the fan is closer to the first air inlet. The oil fume gas can directly enter the main first suction inlet of the fan on the rear side through the protrusion along the notch on the rear side of the second ventilation component, which greatly shortens the oil fume path and improves the oil fume extraction efficiency.

[0025] Preferably, to further ensure the air exchange rate, the flow area of ​​the first air inlet on the second ventilation component body is s1, the flow area of ​​the first suction inlet of the fan system is s2, and s1 / s2≥30% is satisfied.

[0026] Furthermore, to increase the air exchange rate, a third ventilation hole is provided on the second part.

[0027] Preferably, to further ensure the air exchange volume, the total flow area of ​​the first air inlet and the third ventilation hole on the second ventilation component body is s3, the flow area of ​​the first suction inlet of the fan system is s2, and s3 / s2≥35% is satisfied.

[0028] To meet safety requirements and ensure sufficient flow area at the first air inlet, the distance between the front edge of the first air inlet and the rear sidewall of the casing is d3, and d3≤50mm.

[0029] Furthermore, to increase the air intake, the second ventilation component also includes a mounting portion for mounting the second ventilation component body to the housing. The mounting portion extends upward from the rear end of the second ventilation component body, and the bottom of the mounting portion is recessed upward to form a second air inlet. The second air inlet and the first air inlet are connected.

[0030] Furthermore, the upper edge of the second air inlet is arched from the left and right sides toward the middle, which can promote the gathering of oil fumes from the left and right sides toward the middle and quickly enter the first intake.

[0031] Furthermore, to meet safety requirements and ensure sufficient flow area for the second air inlet, the second part is arched from the left and right sides towards the middle, thus forming a ridge in the middle of the second part. The apex of the upper edge of the second air inlet corresponds to the ridge of the second part, and the minimum distance between the apex and the ridge is d7, which satisfies d7≤50mm.

[0032] Furthermore, a fan system is also provided inside the housing. In the oil fume flow path, the fan system is located downstream of the second ventilation component. The fan system's axis extends front to back. The fan system includes a first intake port facing rearward and a second intake port facing forward. The first intake port is the main intake port. The front-to-back depth of the portion of the housing containing the fan system is B'. The vertical distance between the projections of the front end of the second portion and the rear sidewall of the portion of the housing containing the fan system onto the horizontal plane is B1', and B1' / B' ≥ 1 / 2 is satisfied. This promotes the front-to-back diversion of oil fumes at the second portion, with most of the oil fumes diverting rearward and entering the first intake port.

[0033] Furthermore, a fan system is also provided inside the housing. In the oil fume flow path, the fan system is located downstream of the second ventilation component. The fan system's axis extends front to back. The fan system includes a first intake port facing rearward and a second intake port facing forward. The first intake port is the main intake port. The width of the fan system is B. The vertical distance between the projection of the front end of the second part and the first intake port onto the horizontal plane is B1, satisfying B1 / B ≥ 2 / 3. This promotes the front-to-back diversion of oil fumes at the second part, with most of the oil fumes diverting rearward and entering the first intake port.

[0034] Furthermore, the second part has a ridge and side portions located on the left and right sides of the ridge, the side portions gradually sloping downwards away from the ridge;

[0035] On the horizontal plane projection, the 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 intake. The second part arches from the left and right sides towards the middle to form a cavity, so that the direction of the oil fume airflow matches the first intake on the rear side, thereby promoting the flow of oil fumes towards the first intake.

[0036] Furthermore, the second part has a ridge and side portions located on the left and right sides of the ridge. The side portions gradually slope downward away from the ridge. The ridge slopes downward from front to back at an angle α with the horizontal plane. The first part slopes downward from front to back at an angle β with the horizontal plane, and α < β. This further promotes the diversion of oil fumes at the second part and reduces the impact of the slope 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.

[0037] Compared with the prior art, the advantages of this utility model of the second ventilation component are:

[0038] 1. By forming a raised portion in the second ventilation component, the second ventilation component is not completely attached to the first ventilation component. Even when the two layers of filter screens are close together and the airflow is restricted due to the interlacing of the mesh, the large gap formed between the raised portion of the second ventilation component and the corresponding portion of the first ventilation component can provide space for air circulation. This facilitates ventilation when the unit is off, keeping the indoor air in the kitchen clean.

[0039] 2. Because the distance between the first and second ventilation components is small when the range hood is off, the fan will whistle when the range hood is turned on due to the small distance between the two layers of mesh. Therefore, the fan can only start after the distance between the two layers of filter reaches a certain level, which will cause the oil fumes to escape because they cannot be sucked in. In this utility model, by setting a protruding part, the air intake channel is enlarged at the protruding part when the range hood is off, which can reduce the suction resistance at the moment of startup. Thus, the fan can start working simultaneously the moment the distance between the two layers of filter expands, and quickly suck up the oil fumes. Attached Figure Description

[0040] Figure 1 This is a schematic diagram (first state) of a range hood according to the first embodiment of the present invention;

[0041] Figure 2 This is an exploded structural diagram of the range hood according to the first embodiment of the present utility model;

[0042] Figure 3 This is a cross-sectional view (first state, front and back cross-section) of the range hood according to the first embodiment of the present utility model;

[0043] Figure 4 for Figure 3 A magnified schematic diagram of part I;

[0044] Figure 5 This is a schematic diagram of the second ventilation component of the range hood according to the first embodiment of the present invention;

[0045] Figure 6 This is a cross-sectional view (front and rear section) of the second ventilation component of the range hood according to the first embodiment of the present invention;

[0046] Figure 7 This is a cross-sectional view of the range hood according to the first embodiment of the present utility model (first state, left-right cross-section, viewed from back to front);

[0047] Figure 8 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;

[0048] Figure 9 for Figure 8 A magnified schematic diagram of part II;

[0049] Figure 10 This is a schematic diagram (second state) of the range hood according to the first embodiment of the present invention;

[0050] Figure 11 This is a cross-sectional view (second state, front and rear section) of the range hood according to the first embodiment of the present utility model;

[0051] Figure 12 This is a cross-sectional view of the range hood according to the second embodiment of the present invention (first state, front and back cross-section, with the fan system hidden);

[0052] Figure 13 This is a schematic diagram of the second ventilation component of the range hood according to the second embodiment of the present invention. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] Example 1

[0056] See Figures 1 to 7 A range hood includes a housing 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 have rectangular horizontal cross-sections.

[0057] 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.

[0058] 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 4 The connection point on the front side of the second 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 8 and Figure 9 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.

[0059] 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 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 holes 322 are at least partially opened on the first part 3211. In this embodiment, all the second ventilation holes 322 are opened on the first part 3211, and the first part 3211 is also generally flat.

[0060] 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.

[0061] 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 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 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 10 and Figure 11 In this state, the minimum vertical distance between the second ventilation component 32 and the first ventilation component 31 is h. 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. In this embodiment, both the first ventilation component 31 and the second ventilation component 32 are filters, but alternatively, they can be formed by openings in a plate.

[0062] 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<5m 3 / min, when 3mm≤d1≤5mm, the flow rate is 2~3m³ / min. 3 / min. Normal ventilation flow rate needs to be no less than 10m³ / min. 3 / min, it can be seen that the flow rate is restricted at this time, which will prevent normal ventilation or greatly prolong the ventilation time, resulting in abnormal ventilation function. To address this, the second part 3212 protrudes away from the first ventilation component 31 relative to the first part 3211, that is, it protrudes upwards. This creates a larger gap between the second ventilation component 32 and the first ventilation component 31, providing space for air circulation. This allows the airflow to enter this larger gap without having to make a sudden turn like in other parts, but instead to smoothly turn and flow upwards from the second part 3212 or from the edge of the second part 3212. The airflow resistance is greatly reduced, thereby ensuring that the ventilation function is normal and keeping the air in the kitchen clean.

[0063] 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.

[0064] 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).

[0065] 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 the accumulated oil 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 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 the auxiliary intake.

[0066] 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.

[0067] 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 5 The area of ​​the first intake 21 of the fan system 2 (shown by the dashed line) is s1, and the area enclosed by the edge of the first intake 21 (usually the area enclosed by the 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. S1 / s2 ≥ 30% is satisfied to ensure sufficient airflow. 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 is s3, and s3 / s2 ≥ 35% is satisfied.

[0068] 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, and d4 ≤ D / 2, where D is the diameter of the first intake 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.

[0069] 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.

[0070] 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.

[0071] The ridge 3213 of the second part 3212 gradually slopes downward from front to back, with an angle of α between it and the horizontal plane. The angle of inclination between the first part 3211 and the horizontal plane is β, and α < β. This can further promote the diversion of oil fumes at the second part 3212, guide most of the oil fumes to the rear side, and reduce the influence of the inclination on the forward flow of oil fumes, thus facilitating the diversion of most oil fumes to the rear side and into the first inlet 21.

[0072] 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.

[0073] The second ventilation component 32 also includes a mounting portion 325 for mounting the second ventilation component body 321 to the second housing 12. The mounting portion 325 extends upward from the rear end of the second ventilation component body 321. The bottom of the 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). The minimum distance between the apex of the upper edge of the second air inlet 326 and the ridge 3213 of the second ventilation component 32 is d7. Similarly, to meet safety requirements and ensure sufficient flow area of ​​the second air inlet 326, d7 ≤ 50 mm.

[0074] Example 2

[0075] See Figure 12 and Figure 13 In this embodiment, the difference from the first embodiment described above is that the first part 3211 and the second part 3212 of the second ventilation component 32 are arranged at intervals in the left-right direction, so that the second ventilation component 32 as a whole forms a wave-like undulating filter screen. The first part 3211 no longer has a second ventilation hole 322, and the second part 3212 no longer has a third ventilation hole 324. Instead, the second ventilation hole 322 is formed on the second part 3212.

[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 housing and a ventilation assembly, the ventilation assembly comprising a first ventilation component (31) and a second ventilation component (32) disposed within the housing, the first ventilation component (31) comprising a first ventilation component body (311) and a first ventilation hole (312) formed on the first ventilation component body (311), the second ventilation component (32) comprising a second ventilation component body (321) correspondingly disposed above the first ventilation component (31) and a second ventilation hole (322) formed on the second ventilation component body (321), the first ventilation hole (312) and the second ventilation hole (322) being arranged alternately; characterized in that: The second ventilation component body (321) includes a first part (3211) and a second part (3212). The second ventilation hole (322) is opened on the first part (3211). The second part (3212) protrudes away from the first ventilation component (31) relative to the first part (3211), so that airflow can flow upward from the second part (3212) or the edge of the second part (3212). The range hood can be in at least the following first state: the first part (3211) of the second ventilation component body (321) is in close proximity to the first ventilation component body (311) of the first ventilation component (31).

2. The range hood according to claim 1, characterized in that: In the first state, the maximum distance between the first part (3211) and the first ventilation component body (311) of the first ventilation component (31) is d1, and d1≤20mm is satisfied.

3. The range hood according to claim 1, characterized in that: In the first state, the maximum distance between the first part (3211) and the first ventilation component body (311) of the first ventilation component (31) is d1, and d1≤15mm is satisfied.

4. The range hood according to claim 1, characterized in that: In the first state, the maximum distance between the first part (3211) and the first ventilation component body (311) of the first ventilation component (31) is d1, and satisfies 3mm≤d1≤5mm.

5. The range hood according to claim 1, characterized in that: One of the second ventilation component (32) and the first ventilation component (31) can be raised or lowered relative to the other.

6. The range hood according to claim 5, characterized in that: The outer casing includes a first housing (11), a second housing (12), and a smoke hood (6) disposed at the bottom of the first housing (11). A smoke inlet (62) is formed on the smoke hood (6). 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 first housing (11) is movable relative to the second housing (12). The first ventilation component (31) is disposed at the smoke inlet (62), and the second ventilation component (32) is disposed on the second housing (12).

7. The range hood according to claim 6, characterized in that: The first state is the rising state of the first ventilation component (31); the range hood can also be in the second state where the first ventilation component (31) is falling: the minimum vertical distance between the second ventilation component (32) and the first ventilation component (31) is h, and h > 20 mm.

8. The range hood according to claim 6, characterized in that: The first state is the rising state of the first ventilation component (31); the range hood can also be in the second state where the first ventilation component (31) is falling: the minimum vertical distance between the second ventilation component (32) and the first ventilation component (31) is h, and h > 15 mm.

9. The range hood according to any one of claims 1 to 8, characterized in that: The 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.

10. The range hood according to any one of claims 1 to 8, characterized in that: The outer casing is also provided with a fan system (2). In the oil fume flow path, the fan system (2) is located downstream of the second ventilation component (32). The axis (X) of the fan system (2) extends back and forth. The fan system (2) includes at least a first intake port (21) facing the rear. The second ventilation component body (321) has a first air inlet (323) formed thereon, and the rear end of the second part (3212) forms one side edge of the first air inlet (323).

11. The range hood according to claim 10, characterized in that: The flow area of ​​the first air inlet (323) on the second ventilation component body (321) is s1, and the flow area of ​​the first suction inlet (21) of the fan system (2) is s2, and s1 / s2≥30% is satisfied.

12. The range hood according to claim 10, characterized in that: The second part (3212) has a third ventilation hole (324).

13. The range hood according to claim 12, characterized in that: The total flow area of ​​the first air inlet (323) and the third ventilation hole (324) on the second ventilation component body (321) is s3, and the flow area of ​​the first suction inlet (21) of the fan system (2) is s2, and s3 / s2≥35% is satisfied.

14. The range hood according to claim 10, characterized in that: The distance between the front edge of the first air inlet (323) and the rear side wall of the outer casing is d3, and d3≤50mm.

15. The range hood according to claim 10, characterized in that: The second ventilation component (32) further includes a mounting portion (325) for mounting the second ventilation component body (321) onto the housing. The mounting portion (325) extends upward from the rear end of the second ventilation component body (321). The bottom of the mounting portion (325) is recessed upward to form a second air inlet (326). The second air inlet (326) communicates with the first air inlet (323).

16. The range hood according to claim 15, characterized in that: The upper edge of the second air inlet (326) is arched from the left and right sides toward the middle.

17. The range hood according to claim 16, characterized in that: The second part (3212) is arched from the left and right sides toward the middle, and the middle position of the second part (3212) forms the ridge (3213). The vertex of the upper edge of the second air inlet (326) corresponds to the ridge (3213) of the second part (3212). The minimum distance between the vertex and the ridge (3213) is d7, and d7≤50mm is satisfied.

18. The range hood according to any one of claims 1 to 8, characterized in that: The housing is also equipped with a fan system (2). In the oil fume flow path, the fan system (2) is located downstream of the second ventilation component (32). The axis (X) of the fan system (2) extends back and forth. The fan system (2) includes a first intake port (21) facing the rear and a second intake port (22) facing the front. The first intake port (21) is the main intake port. The front and rear depth of the part of the housing that houses the fan system (2) is B'. The vertical distance between the projection of the front end of the second part (3212) and the rear side wall of the part of the housing that houses the fan system (2) on the horizontal plane is B1', and B1' / B'≥1 / 2 is satisfied.

19. The range hood according to any one of claims 1 to 8, characterized in that: The outer casing is also equipped with a fan system (2). 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 horizontally back and forth. The fan system (2) includes a first intake port (21) facing the rear and a second intake port (22) facing the front. The first intake port (21) is the main intake port. The width of the fan system (2) is B. The vertical distance between the front end of the second part (3212) and the projection of the first intake port (21) on the horizontal plane is B1, and B1 / B ≥ 2 / 3 is satisfied.

20. The range hood according to claim 19, characterized in that: 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 sloping downward away from the spine (3213); On the horizontal projection, the 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).

21. The range hood according to claim 19, characterized in that: 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 spine (3213) gradually slopes downward from front to back and the angle between it and the horizontal plane is α. The first part (3211) gradually slopes downward from front to back and the angle between it and the horizontal plane is β, and α < β.

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