Range hood

Abstract

The range hood comprises a first shell, a second shell and an exhaust fume collecting hood, the periphery of the second shell is at least partially coated with the first shell, at least part of the first shell is located below the second shell, and the first shell can do up-and-down lifting motion relative to the second shell; a control panel is arranged on the front side of the first shell, the distance between the front side of the first shell and the front side of the second shell is smaller than the thickness of the part, located in the first shell, of the control panel, so that the control panel is kept below the second shell when the first shell ascends and descends, and the exhaust fume collecting hood is arranged on the first shell; the distance of the exhaust fume collecting hood extending forwards out of the front side of the first shell is a1, the vertical distance from the operation center of the control panel to the top face of the exhaust fume collecting hood is b2, the included angle between the connecting line from the operation center of the control panel to the front side of the exhaust fume collecting hood and the vertical direction is delta, tan delta = a1 / b2, a1 is larger than or equal to 0 mm, and delta is smaller than or equal to 40 degrees.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil fume purification device, in particular to an extractor hood. BACKGROUND

[0002] The extractor hood has become one of the indispensable kitchen household appliances in modern families. The extractor hood works by using the principle of fluid dynamics, and uses a filter screen to filter part of the oil particles. The fan system is usually a centrifugal fan, including a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, which sucks the oil fume below the extractor hood into the fan, and then accelerates the oil fume to be collected and guided by the volute and discharged outdoors.

[0003] The traditional top suction type extractor hood has a large size of the smoke collecting hood, and the front and rear sizes are too large to meet the demand of cabinet packaging. In addition, the user is easy to hit his head during use, and the thickness size is too large, which makes the extractor hood heavy and occupies too much space in the cooking area.

[0004] Therefore, the applicant designs a lifting type thin extractor hood. See the Chinese patent No. 202010404880.4, which discloses an extractor hood, comprising a movable part, a fixed part, and a movement mechanism for electrically driving the movable part to lift relative to the fixed part. The movable part includes a smoke collecting hood, and the fixed part includes a fan frame.

[0005] The change of the working mode of the extractor hood can achieve good oil fume suction effect (closer to the smoke source after lowering) and simple and beautiful appearance when the machine is turned off. For the appearance, the control panel is usually arranged in the middle of the lower box (even if the lower box is wide, it can be arranged in this way). When the upper box and the lower box are equal in width, during the lifting of the lower box, the part of the control panel in the lower box will inevitably overlap the upper box in the front and rear directions. For the thin extractor hood, the front and rear depths of the upper and lower boxes are close, so the thickness of the control panel in the lower box limits it from entering the gap between the nested upper and lower boxes. Therefore, the installation height of the control panel on the lower box will affect the compactness of the machine after rising. SUMMARY

[0006] The present application solves the technical problems of the prior art, and provides an extractor hood that balances the oil fume suction effect, user operation, and the height compactness of the machine.

[0007] The technical scheme adopted by the present application to solve the above technical problems is as follows: an extractor hood, comprising a first shell, a second shell, and a smoke collecting hood, the first shell is at least partially wrapped around the outer periphery of the second shell and at least partially located below the second shell, and the first shell can move up and down relative to the second shell.

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

[0009] The front side of the first housing is provided with a control panel, 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 part of the control panel located in the first housing, so that the control panel is kept below the second housing when the first housing is lifted, the smoke collecting hood is arranged on the first housing, the smoke collecting hood is formed with a smoke suction port, and the first ventilation component is arranged at the smoke suction port;

[0010] The smoke collecting hood extends forward beyond the front side of the first housing by a distance a1, the vertical distance from the operating center of the control panel to the bottom of the first housing is b2, and on the vertical plane extending forward and backward, the angle between the line connecting the operating center of the control panel to the front side of the smoke collecting hood and the vertical direction is δ, tan δ = a1 / b2;

[0011] The range hood can be in a non-working state in which the first housing is lifted relative to the second housing, at this time the overall height of the range hood is H0, and H0 = H1 + H2, wherein H1 is the height of the second housing, H2 is the height of the first housing and the smoke collecting hood together below the second housing, and H2 = b1 + b2 + b3 + h2 + a, wherein 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 of the smoke collecting hood to the top of the part of the control panel located in the first housing, h2 is the height from the bottom of the smoke collecting hood to the bottom of the first housing, a is the installation gap between the top of the part of the control panel located in the first housing and the bottom of the front side wall of the second housing, and h2 is the thickness of the smoke collecting hood;

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

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

[0014] Since the thickness of the control panel limits its access to the space between the first shell and the second shell when the first shell is lifted, the height of the whole machine in the non-working state is restricted by the avoiding size of the control panel, and the avoiding size of the control panel is affected by the width of the smoke hood extending out of the front side of the first shell, which affects the user experience of operating the keys on the control panel, so it is necessary to select appropriate operation center of the control panel and size parameters of the width of the smoke hood extending out of the first shell to avoid the interference of the smoke hood with the user's operation on the keys on the control panel, while avoiding the excessive height of the first shell, so as to make the oil fume suction effect, user operation and compactness of the whole machine most suitable; in addition, since the top suction type range hood needs to be provided with a double-layer net to avoid oil dripping, the double-layer net is arranged in the avoiding space formed by the control panel in the present application, which fully utilizes the space and meets the oil path requirement.

[0015] For easy operation, the width of the first shell and the second shell in the left-right direction is adapted, and the control panel is located in front of the second shell.

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

[0017] Further, in order to avoid the influence of oil fume on the normal work of the control panel, the range hood further comprises a partition plate separating the control panel and the smoke suction port.

[0018] Further, in order to facilitate filtering of oil fume and receiving oil liquid flowing down from the second shell or the fan system, the first ventilation component is provided on the bottom of the second shell or in the second shell.

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

[0020] The range hood can at least be in a state that the first shell is lifted to make the first ventilation component and the second ventilation component close to each other, in which 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 3mm≤d1≤5mm is satisfied, so that the first shell and the second shell can be as close as possible in the non-working state, to further improve the compactness of the whole machine in the non-working state.

[0021] Further, the second ventilation component body of the second ventilation component further comprises a second part protruding away from the first ventilation component relative to the first part, a vertical distance between the highest point of the second part and a reference plane where the first part is located is d2, and d2≥5mm is satisfied. By providing the second part, the air inlet resistance can be reduced, so as to increase the air inlet amount or meet other requirements, such as ventilation in a non-working state.

[0022] In order to further improve the compactness of the whole machine, d2 also satisfies the following relationship: d2≤25mm.

[0023] Further, the range hood further comprises a fan system arranged at least partially in the second shell, the second ventilation component comprises a second ventilation component body and a second ventilation hole provided on the second ventilation component body, the second ventilation component body is located below the second shell, and the bottom of the fan system is lower than the bottom of the second shell, so that the fan system is arranged below to reduce the negative pressure area and improve the oil fume suction effect.

[0024] Further, the second ventilation component is connected to the bottom of the second shell, so that the second ventilation component can receive the oil flowing down the wall surface of the second shell.

[0025] Compared with the prior art, the advantages of the present application are as follows: for the present patent, as the range hood rises, the upper and lower two layers of nets approach each other, and when the range hood rises to the highest position, the height of the whole range hood is the smallest, and the control panel is generally installed on the first shell. Since the thickness of the control panel on the first shell is greater than the gap between the front sides of the two shells, the installation height of the control panel limits the rising distance of the range hood, that is, the compactness of the whole machine after the range hood rises. In addition, due to the existence of the smoke collecting hood, the control panel must be installed at a certain height on the first shell for the user to operate. Therefore, by associating the size parameter of the smoke collecting hood extending out of the width of the first shell with the size parameter of the smoke collecting hood of the operating center installation height of the control panel, the operating center installation height of the control panel is determined, so as to avoid the interference of the smoke collecting hood with the user's operation on the keys of the control panel, while avoiding the excessive total height of the first shell, thereby making the oil fume suction effect, user operation and compactness of the whole machine most suitable. In addition, since the top suction type range hood needs to be provided with double-layer nets to avoid oil dripping, the double-layer nets are arranged in the avoidance space formed due to the control panel in the present application, so as to fully utilize the space while meeting the oil path requirement. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a schematic view of a range hood of an embodiment of the present application (first state);

[0027] Figure 2 FIG. 2 is an exploded structural schematic view of the range hood of the embodiment of the present application.

[0028] Figure 3 Fig. 2 is a front sectional view (first state, front-to-back sectional plane) of an embodiment of the extractor hood according to the present application;

[0029] Figure 4 Fig. 3 is a perspective structural sectional view (first state, parallel to the sectional plane of Fig. 2) of an embodiment of the extractor hood according to the present application; Figure 3

[0030] Figure 5 Fig. 4 is a partial I enlarged schematic view of Fig. 3; Figure 4

[0031] Figure 6 Fig. 5 is a schematic view of a second ventilation component of an embodiment of the extractor hood according to the present application;

[0032] Figure 7 Fig. 6 is a sectional view (front-to-back sectional plane) of the second ventilation component of an embodiment of the extractor hood according to the present application;

[0033] Figure 8 Fig. 7 is a sectional view (first state, left-to-right sectional plane, seen from back to front) of an embodiment of the extractor hood according to the present application;

[0034] Figure 9 Fig. 8 is a schematic view of a portion of the second housing, the first housing, the first ventilation component and the oil cup of an embodiment of the extractor hood according to the present application;

[0035] Figure 10 Fig. 9 is a sectional view (left-to-right sectional plane) of the second housing, the movement mechanism and the second ventilation component of an embodiment of the extractor hood according to the present application;

[0036] Figure 11 Fig. 10 is a partial II enlarged schematic view of Fig. 9; Figure 10 Figure 12 Fig. 11 is a schematic view of an embodiment of the extractor hood according to the present application (second state);

[0037] Figure 13 Fig. 12 is a sectional view (second state, front-to-back sectional plane) of an embodiment of the extractor hood according to the present application;

[0038] Figure 14 Fig. 13 is a partial III enlarged schematic view of Fig. 12; Figure 13

[0039] Figure 15 Fig. 14 is a sectional view (first state, front-to-back sectional plane) of an alternative embodiment of the extractor hood according to the present application. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions.​​​​

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the present application can be disposed in different directions, so these orientation-indicating terms are only illustrative and should not be regarded as limiting, such as "upper", "lower" do not necessarily mean the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0042] Referring to Figures 1-8 An extractor hood, which is a top suction extractor hood, comprises a housing, the housing comprising a first housing 11 and a second housing 12, the first housing 11 at least partially wrapping around the outer periphery of the second housing 12, and the first housing 11 being at least partially located below the second housing 12. The second housing 12 can be fixed with 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, in fluid communication with each other, and preferably have a rectangular horizontal cross-section.

[0043] The housing further comprises a smoke collecting hood 6 arranged at the bottom of the first housing 11, the smoke collecting hood 6 having a smoke collecting cavity 61 formed therein and rising upward from the bottom surface. The smoke collecting hood 6 is provided with a smoke suction port 62 at the top of the smoke collecting cavity 61. By forming the smoke collecting cavity 61 rising upward, the smoke can be collected, preventing the oil fume from escaping when contacting the smoke collecting hood 6. Moreover, since the smoke collecting cavity 61 rises upward, the bottom surface of the smoke collecting hood 6 is not exposed, which can better achieve the concealment of the extractor hood.

[0044] The range hood further comprises a fan system 2 and a ventilation assembly, wherein the fan system 2 is at least partially arranged in the second housing 12, and in the embodiment, the fan system 2 is a centrifugal fan. The ventilation assembly comprises a first ventilation component 31 and a second ventilation component 32, the first ventilation component 31 is arranged at the smoke suction port 62, and the second ventilation component 32 is arranged at the bottom of the second housing 12, and preferably, the second ventilation component 32 is connected with the bottom of the second housing 12, so as to receive the oil flowing down from the inner side wall of the second housing 12 and the fan system 2. The second ventilation component 32 and the second housing 12 can be directly connected or indirectly connected, and can be connected inside the second housing 12 or outside the second housing 12. In order to ensure that the second ventilation component 32 can receive the oil flowing down from the inner side wall of the second housing 12, when the connection position is located inside the second housing 12, the second ventilation component 32 or an additional arranged connecting piece is in contact with the inner side wall of the second housing 12; when the connection position is located outside the second housing 12, in the projection on the horizontal plane, the second ventilation component 32 or the additional arranged connecting piece at least partially covers the bottom edge of the second housing 12. In the embodiment, the front and rear sides of the second ventilation component 32 are connected to the inner side of the second housing 12, and the left and right sides are connected to the lower side of the second housing 12, see Figure 5 , the connection position of the rear side of the second ventilation component 32 is located in front of the rear side wall of the second housing 12, and the two can be fixed by the front and rear extending screws, see also Figure 9 and Figure 10 , the connection position of the right side of the second ventilation component 32 is located below the right side wall of the second housing 12 (here, the flanges can be formed respectively), and the two can be fixed by the up and down extending screws.

[0045] The first ventilation component 31 comprises a first ventilation component body 311 and a first ventilation hole 312 arranged on the first ventilation component body 311, in the embodiment, the first ventilation component body 311 is a substantially flat plate, and the first ventilation hole 312 is a long strip-shaped mesh hole and extends front and rear, so that the first ventilation component 31 is formed as a grating mesh. The second ventilation component 32 comprises a second ventilation component body 321 and a second ventilation hole 322 arranged 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, and the second ventilation hole 322 is also a long strip-shaped mesh hole and extends front and rear. In order 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 part between the adjacent two second ventilation holes 322, and the second ventilation hole 322 corresponds to the solid part between the adjacent two second ventilation holes 322. The second ventilation component body 321 of the second ventilation component 32 comprises a first part 3211 and a second part 3212, the above-mentioned second ventilation hole 322 is arranged on the first part 3211, and the first part 3211 is also a substantially flat plate.

[0046] The length extension directions of the first air vent 312 and the second air vent 322 are consistent, and the angle between the length direction of the second air vent 322 and the axis X of the fan system 2 is ≤45° in the projection on the horizontal plane. Since the first air vent component 31 and the second air vent component 32 are both grilles, the grille directions of the two layers of filter screens are basically consistent, and the grille direction of the second air vent component 32 is consistent with or has a small angle with the air inlet direction of the fan system 2, so that the airflow can rise in a relatively stable path, reduce the large air inlet resistance caused by path conversion, play a role in airflow carding, and also reduce noise. The first air vent component 31 and the second air vent component 32 are filter screens in this embodiment, and can be replaced by plate members with openings.

[0047] The lifting of the first shell 11 can meet the needs of gathering smoke during work and hiding during non-work, and through the above structure, the change of the distance between the first air vent component 31 and the second air vent component 32 can be realized without separately setting a movement mechanism, which simplifies the structure and reduces the cost.

[0048] Therefore, the range hood can at least be in two states, the first state: the first shell 11 is in the highest position, at which time the first air vent component 31 and the second air vent component 32 are in a close state. Here, the close state means that the maximum distance between the first part 3211 of the second air vent component body 321 of the second air vent component 32 and the first air vent component 31 is d1, and d1≤20mm, and preferably d1≤15mm. The smaller d1 is, the closer the two can be in the rising state, and the more compact the overall structure of the machine can be in the rising state. The minimum value of d1 can be 0, but considering the gap in actual structural design, more preferably, 3mm≤d1≤5mm. The distance between the first part 3211 and the first air vent component 31 is defined as the length of the perpendicular line from any point on the first part 3211 to the plane on which the first air vent component body 311 of the first air vent component 31 faces the second air vent component 32 (since the first air vent component body 311 is flat, it can be regarded as a plurality of parallel planes stacked together). When the range hood is turned on, the first shell 11 is lowered relative to the second shell 12, and the distance between the first air vent component 31 and the second air vent component 32 gradually increases until the first shell 11 is lowered to the desired position, at which time it is recorded as the second state, see 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, which is the distance between the lowest point of the second ventilation component 32 and the highest point of the first ventilation component 31 projected on a vertical plane, and h>15mm, and more preferably h>20mm, since the first ventilation holes 312 and the second ventilation holes 322 are staggered, only when h is large enough, the turning angle of the air flow from the first ventilation component 31 to the second ventilation component 32 upward is small enough to pass through the second ventilation holes 322 more. By selecting the above h value, after the oil fume passes through the first ventilation component 31, the area of the second ventilation hole 322 with a width of about 1 / 2 of the direction can be used as an effective area for the oil fume to pass through when the turning angle is less than 30°, to ensure the effective ventilation area between the second ventilation component 32 and the first ventilation component 31, and to ensure smooth air intake.

[0049] In the first state, when d1≤20mm, if the filter screen structure of the two layers of screens disclosed in the background art is adopted, that is, both are flat screens, under the premise of ensuring that the size of the noise meets the comfort level of experience, the flow rate is <6m 3 / min when d1≤15mm, and the flow rate is <5 3 / min. It can be seen that the flow rate at this time is limited, which cannot realize normal ventilation or greatly prolongs the ventilation time, resulting in abnormal ventilation function. Therefore, the second part 3212 is raised relative to the first part 3211 in a direction away from the first ventilation component 31, that is, upward, so that the second ventilation component 32 and the first ventilation component 31 have a part with a large spacing, providing space for air flow, so that the air flow can flow smoothly from the second part 3212 or the edge of the second part 3212 upward when entering the space with a large spacing, and the air flow resistance is greatly reduced, thereby ensuring that the ventilation function is normally realized and the air in the kitchen is kept clean.

[0050] In addition, by providing the raised second part 3212 on the second ventilation component 32, the air inlet passage of the range hood for oil fume passing through is expanded at the raised position in the first state, thereby reducing the air suction resistance at the moment of starting, so that the fan system 2 can start working at the same time when the distance between the two layers of filter screens is expanded, quickly sucking and removing the oil fume, and avoiding the escape of oil fume at the moment of starting.

[0051] The vertical distance between the highest point of the second portion 3212 and the reference plane on which the first portion 3211 is located is d2, and d2≥5mm is satisfied, so as to ensure that the second portion 3212 protrudes high enough to satisfy sufficient flow area. In addition, in consideration of the compactness of the whole machine, it is preferable to also satisfy d2≤25mm. The reference plane refers to the plane on which the junction of the first portion 3211 and the second portion 3212 is located (the points at the junction are on the same plane).

[0052] The rear bottom of the first housing 11 is provided with an oil cup 4, and the first ventilation component 31 and the second ventilation component 32 both extend gradually downward from front to back as a whole, so as to guide the accumulated oil stains into the oil cup 4. On 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 front and back, including the first suction inlet 21 as the main suction inlet and the second suction inlet 22 as the auxiliary suction inlet. The first suction inlet 21 is rearward, which can reduce the aerodynamic noise of the fan system 2 away from the human ear.

[0053] Correspondingly, the first portion 3211 is wrapped around the outer periphery of the second portion 3212 on the front, left and right three sides, and the first air inlet 323 is formed on the second ventilation component body 321, and the rear end of the second portion 3212 forms a side edge of the first air inlet 323, so that when air is exchanged, air and oil fume can flow upward after passing through the second portion 3212 and reaching the edge of the second portion 3212. A third ventilation hole 324 can also be formed on the second portion 3212 to increase the air inlet area through which air and oil fume pass when air is exchanged and oil fume is sucked. Moreover, the third ventilation hole 324 is provided, so that when the airflow enters the larger space between the first ventilation component 31 and the second ventilation component 32, it can directly flow upward from the second portion 3212, reducing the energy loss caused by the turning of the airflow.

[0054] The flow area of the first air inlet 323 on the second ventilation component 32 (the area surrounded 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, and the rear edge of the first air inlet 323 is based on the line between the left and right rear ends of the first portion 3211, which can be seen from Figure 5The flow area of the first air inlet 21 (the area surrounded by the edge of the first air inlet 21, usually the area surrounded by the inner periphery of the air inlet ring on the volute of the fan system 2, the air inlet ring is not marked in the figure) of the fan system 2 (s2) and s1 / s2≥30% is satisfied, so as to ensure sufficient air exchange flow. When the third vent hole 324 is selected, the total flow area of the first air inlet 323 and the third vent hole 324 on the second vent part 32 (the flow area of the third vent hole 324 is the sum of the areas surrounded by the edges of the third vent holes 324) is s3, and s3 / s2≥35% is satisfied.

[0055] The second part 3212 can be in the shape of arching from the left and right sides to the middle, and the arched middle part is configured as a ridge 3213, and the left and right sides of the ridge 3213 are configured as side parts 3214, and each side part 3214 gradually inclines downward away from the ridge 3213. The distance in the horizontal direction between the projection of the ridge 3213 on the horizontal plane and the axis X of the fan system 2 is d4 (measured at the middle position of the ridge 3213 in the left-right direction), and d4≤D / 2 is satisfied, where D is the diameter of the first air inlet 21. d4 means the size of the degree of deviation of the ridge 3212 from the axis X of the fan system 2, and thus d4≤D / 2 can make the range of the ridge 3213 corresponding to the first air inlet 21 of the fan system 2, so that the shape of the second part 3212, i.e. arching from the left and right sides to the middle to form a cavity, can make the oil fume flow converge from the left and right sides to the middle along the second part 3212, and after convergence, the oil fume flow can be located in the range of the first air inlet 21, i.e. the design of the second part 3212 makes the convergence direction of the oil fume match the first air inlet 21 behind, so as to promote the oil fume to flow to the first air inlet 21.

[0056] Thus, the first air inlet 323 and the first air inlet 21 of the fan system 2 cooperate, the protruding second part 3212 can guide the airflow to the first air inlet 323, and the direction of the protrusion matches the direction of the airflow, further reducing the air suction resistance at the start-up moment; at the same time, the second part 3212 arches from the left and right sides to the middle to form a cavity, so that the convergence direction of the oil fume flow (converging from the left and right sides to the middle) matches the first air inlet 21 behind (the conventional fan arrangement, the air inlet of the fan is located at or near the middle of the left and right sides), the first air inlet 21 is close to the first air inlet 323 at the start-up moment, and the oil fume gas can directly enter the first air inlet 21 behind through the first air inlet 323 along the second part 3212, greatly shortening the path of the oil fume, so that the oil fume can be quickly sucked 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 the oil fume that is divided into forward and backward flows after reaching the second part 3212. In this embodiment, the axis X of the fan system 2 extends forward and backward, which can be horizontal or inclined relative to the horizontal direction. The depth of the second shell 12 in the forward and backward directions is B', the vertical distance between the front end of the second part 3212 and the projection of the rear side wall of the second shell 12 on the horizontal plane is B1', and B1' / B'≥1 / 2 is satisfied. Thus, the size of the second part 3212 is as large as possible, covering a larger range, so that a larger proportion of the oil fume rises upward through the second part 3212 to flow upward under the guidance of the second part 3212. Compared with the first part 3211 with a larger inclination, the oil fume is guided by the second part 3212, which can help to slow down the tendency to flow forward along the first part 3211 and increase the tendency to flow backward, so as to increase the proportion of the oil fume that is sucked from the rear main suction inlet. More preferably, the axis X of the fan system 2 extends horizontally forward and backward, and the width of the second part 3212 can be compared with the width of the fan system 2. 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 suction inlet 21 on the horizontal plane is B1, and B1 / B≥2 / 3 is satisfied.

[0058] The ridge 3213 of the second part 3212 is gradually inclined downward from front to back, and the angle between the ridge 3213 and the horizontal plane is α, and the inclination angle between the first part 3211 and the horizontal plane is β, and α<β is satisfied. Thus, the oil fume can be further divided into forward and backward flows at the second part 3212. Since the second ventilation component 32 as a whole is inclined from front to back, and the first suction inlet 21 as the main suction inlet faces the rear side, this will cause the forward guiding direction of the second ventilation component 32 to be contrary to the rear side air inlet of the first suction inlet 21, which is not conducive to air inlet. By providing the second part 3212, since the ridge 3213 can not participate in oil guiding, as described above, the inclination angle can be smaller than that of the first part 3211, thereby reducing the inclination of the second ventilation component 32 as a whole from front to back, guiding most of the oil fume to the rear side, and reducing the influence of the inclination on the forward guiding of the oil fume, so as to facilitate the division of most of the oil fume to the rear side and into the first suction inlet 21. In addition, the provision of the first air inlet 323 or the third ventilation hole 324 can further guide the air flow to flow to the rear side. In addition, the second part 3212 is integrally formed, and the end of the side part 3214 away from the end of the ridge 3213 has a certain distance from the left end or the right end of the first part 3211. Compared with the ridge 3213 extending directly to the left and right side walls of the second shell 12, the shape of the second part 3212 of the present application can make the side part 3214 have a larger inclination, which is conducive to guiding the oil liquid on the ridge 3213 and the side part 3214 to the left and right sides.

[0059] The second ventilation component 32 further comprises a first mounting portion 325 for mounting the second ventilation component body 321 to the second housing 12, the first mounting portion 325 is formed by extending upwardly from the rear side end of the second ventilation component body 321, the bottom of the first mounting portion 325 is concave upwardly to form a second air inlet 326, the first air inlet 323 and the second air inlet 326 are communicated to be integrated. The upper edge of the second air inlet 326 is in the shape of arching from the left and right sides to the middle, the vertex of the upper edge of the second air inlet 326 corresponds to the ridge 3213 in the middle of the second portion 3212 of the second ventilation component 32 (here, the correspondence refers to the position in the left-right direction).

[0060] The portion of the second portion 3212 located at the edge of the first air inlet 323 is formed with a first blocking edge 3219, the first blocking edge 3219 is formed by bending upwardly from the second portion 3212. The first mounting portion 325 is formed with a second blocking edge 3251 extending forwardly at the upper edge of the second air inlet 326.

[0061] The fan system 2 comprises a volute 23, the first suction port 21 and the second suction port 22 are formed in the volute 23, and the volute 23 is provided with an oil drip nozzle 24 at the lowest position. The second ventilation component body 321 of the second ventilation component 32 has a first end 3215 and a second end 3216 opposite in the front-rear direction, in this embodiment, since the fan system 2 is rear-inlet, the first end 3215 is the rear side end, and the second end 3216 is the front side end. In the horizontal plane projection, the first suction port 21 is located between the oil drip nozzle 24 and the first end 3215, and the first air inlet 323 is located between the oil drip nozzle 24 and the first end 3215. The second 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 plane projection, the second portion 3212 covers the oil drip nozzle 24, and the position corresponding to the oil drip nozzle 24 of the second portion 3212 is higher than the end of the second portion 3212 close to the first air inlet 323. Since the end of the volute 23 in the width direction will also drip oil downwardly, therefore, in the horizontal plane projection, the oil dripping portion 231 corresponding to the end surface of the volute 23 where the first suction port 21 is formed is located in the second portion 3212, so as to avoid the oil liquid at this position of the volute 23 from vertically dripping downwardly. The oil dripping portion 231 is the bottom of the end surface of the volute 23 in this embodiment, alternatively, it can also be an independent oil guiding component inclined forwardly and downwardly arranged at the bottom of the end surface.

[0063] Since the axis X of the fan system 2 extends in the front-rear direction, a state in which the wind speed is greater in the middle and smaller on the left and right sides is presented, and at this time, if the oil is directly guided to the rear side, the oil guided to the rear side in the middle will be blown up by the airflow due to the greater wind speed in the middle, thereby causing splashing, and it is thus possible to drop down to the cooktop. Therefore, by providing the second portion 3212 in the form of a protrusion, and by the second portion 3212, the collected oil is guided to the left and right sides of the rear side portion of the housing, the oil is guided downward by using the position with a smaller wind speed, so as to avoid splashing of the oil, so that the oil can flow downward along the wall of the housing until it is collected into the oil cup 4.

[0064] Since the pressure inside the volute 23 is positive, a high-speed airflow will be sprayed out from the volute 23 at the oil drip nozzle 24 at the bottom of the volute 23, and in this case, if the second ventilation component 32 is too close to the oil drip nozzle 24, the oil will splash laterally after dripping onto the second ventilation component 32, and since the second ventilation component 32 has openings and cannot block the splashing oil laterally, the second ventilation component 32 will not be able to function 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 position of the oil drip nozzle 24 is in a closed form, 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≥8mm is satisfied, see Figure 14 .

[0065] The width of the oil drip nozzle 24 is d12 (the size in the front-rear direction), and the closed area of the portion of the second ventilation component body 321 of the second ventilation component 32 corresponding to the position of the oil drip nozzle 24 is at least π(d12 / 2+ctanγ) 2 , γ is the angle between the connecting line between any point on the edge of the oil drip nozzle 24 and any point on the second ventilation component body 321 and the vertical direction, and γ≥30° is satisfied, and it is assumed that the oil drip nozzle 24 is circular.

[0066] Referring again to Figure 2 , the second ventilation component 32 further includes a second mounting portion 327 bent upward from the front side of the second ventilation component body 321, the fourth ventilation hole 3271 is formed in the second mounting portion 327, and the position corresponding to the front side of the oil drip nozzle 24 is in a closed form, and the bottom of the closed position is not lower than the lower end of the oil drip nozzle 24. The flow area of the second ventilation hole 322 of the second ventilation component 32 is greater than the flow area of the fourth ventilation hole 3271 (the definition of the flow area is as the second ventilation hole 322).

[0067] The first end 3215 of the second ventilation component body 321 is formed with a first oil leakage hole 3217. In a horizontal plane projection, the distance between the first oil leakage hole 3217 and the ridge 3213 is d5 (measured at the middle position of the ridge 3213 in the left-right direction), and d5≥50mm is satisfied, so that the first oil leakage hole 3217 is kept at a sufficient distance from the position of the fan system 2 with a large intermediate wind speed to avoid the influence of high-speed airflow on the oil. The first oil leakage hole 3217 can have two, corresponding to the two side portions 3214 of the second portion 3212. The side portion 3214 extends to the first end 3215 of the second ventilation component body 321 away from the ridge 3213, and the first oil leakage hole 3217 can be formed at the transition position of the side portion 3214 and the first end 3215. In a vertical plane projection, the distance between the axis X of the fan system 2 and the first oil leakage hole 3217 is h1, when h1≤350mm, (d5+d4) / h1=tanθ, θ≥10°; when h1>350mm, θ is not required, thereby reducing the interference of airflow on the oil droplet falling path on both sides, and preventing the oil from drifting to the center.

[0068] The first end 3215 of the second ventilation component body 321 is also formed with a second oil leakage hole 3218, which is farther from the axis X of the fan system 2 than the first oil leakage hole 3217, so that the oil on the first portion 3211 of the second ventilation component body 321 is guided downward.

[0069] The side portion 3214 also gradually inclines downward from front to back, and the inclination angle relative to the horizontal plane is also β, to promote the flow of oil on the ridge 3213 to the side portion 3214.

[0070] Referring to Figure 12 and Figure 13 The oil cup 4 corresponding to the first end 3215 of the second ventilation component body 321 is described above, and the width dimension of the open upper end of the oil cup 4 in the front-rear 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 (d6-d11) / d5≥0.1 is satisfied in the second state, so that the oil can flow into the oil cup 4 without drifting forward out of the range of the oil cup 4.

[0071] The front side of the first housing 11 is provided with a control panel 5, and 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 in the first housing 11, so that the control panel 5 is kept below the second housing 12 when the first housing 11 is lifted. The hood 6 extends forward beyond the front side of the first housing 11 by a distance a1, and the vertical distance from the operating center of the control panel 5 to the top surface of the hood 6 is b2. Here, the "operating center" refers to the center of the pattern formed by the keys, touch screen, etc. on the front surface of the first housing 11, and the "center" refers to the horizontal line where the geometric center of the pattern is located. When there are multiple keys, the horizontal line where the lowest center of the multiple key centers is located is used as the reference. When the keys are raised relative to the first housing 11, the projection of the keys on the front surface of the first housing 11 is used as the reference. The axis X of the fan system 2 is located on a front-rear extending vertical plane S (see Figure 4 , which is also the plane parallel to the paper in Figure 3 ), and on this vertical plane S or the plane parallel to the vertical plane S, the angle between the line connecting the operating center of the control panel 5 and the front side of the hood 6 and the vertical direction is δ, tan δ = a1 / b2. When the range hood is in the non-working state with the first housing 11 lifted relative to the second housing 12, the overall height of the range hood at this time is H0, and H0 = H1 + H2, where H1 is the height of the second housing 12, and H2 is the height of the first housing 11 and the hood 6 together 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 in the first housing 11, b3 is the height from the bottom surface of the hood 6 to the bottom of the first housing 11, b3 = 0 as shown in Figure 3 , in which case the smoke inlet 62 can be recessed upward from the bottom surface of the hood 6 into the first housing 11, or b3 > 0 as shown in Figure 15 , in which case the smoke inlet 62 is completely recessed upward from the bottom surface of the first housing 11, h2 is the thickness of the hood 6, and a is the installation gap between the top of the part of the control panel 5 located in the first housing 11 and the bottom of the front side wall of the second housing 12 (in theory, there can be no gap between the two, i.e. a = 0, but due to manufacturing, installation, etc. limitations, there will be a certain gap between the two), and a is usually ≤ 10 mm. The following relationships are also satisfied: a1 ≥ 0 mm, δ ≤ 40°, and when a1 = 0, the front end of the hood 6 is flush with the front end of the first housing 11.

[0072] When the first shell 11 is lowered, it can be lowered to a height of about 450 mm from the cooking bench. The range hood also includes a back plate 13 arranged at the rear side of the first shell 11, and the horizontal distance from the front side of the smoke collecting hood 6 to the back plate 13 is 345-350 mm. The thickness h2 of the smoke collecting hood 6 is 20-30 mm.

[0073] Since the thickness of the control panel 5 limits its entry into the space between the first shell 11 and the second shell 12 when the first shell 11 is raised and lowered, and the heights of the second shell 12 and the control panel 5 are fixed, the overall height of the range hood is restricted by the avoidance size (b1+b2) of the control panel 5, and the avoidance size of the control panel 5 is affected by the width of the smoke collecting hood 6 extending from the front side of the first shell 11, which affects the user's experience in operating the keys on the control panel 5, so it is necessary to select appropriate operation center of the control panel 5 and size parameters of the width of the smoke collecting hood 6 extending from the first shell 11, so as to satisfy a1≥0 mm and δ≤40°, thereby avoiding the interference of the smoke collecting hood 6 with the user's operation on the keys on the control panel 5, while avoiding the overall height of the first shell 11 being too large (so that the overall height of the range hood in the non-working state is relatively compact), and further making the smoke exhaust effect, user operation, and overall height of the range hood most suitable.

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

[0075] Referring again to 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 shell 11 is S3. The smoke collecting cavity 61 has a shape of arching from the front and back sides to the middle, and the highest point is close to the front side of the first shell 11. The depth of the smoke collecting cavity 61 in the front-rear direction is S, the angle between the wall surface of the smoke collecting hood 6 constituting the front side of the smoke collecting cavity 61 and the horizontal direction is θ1, and the angle between the wall surface of the smoke collecting hood 6 constituting the rear side of the smoke collecting cavity 61 and the horizontal direction is θ2. In order to ensure the smoke collection effect of the smoke collecting cavity 61, S≥280 mm and θ1≥25°. In order to ensure the oil guiding function, θ2≥12° and the above-mentioned β( Figure 7

[0076] ​The term "fluid communication" as used herein refers to a spatial relationship between two components or locations (hereinafter collectively referred to as first location and second location, respectively), i.e. a fluid (gas, liquid or a mixture of both) can flow or / and be transported from the first location to the second location along a flow path. The first location and the second location can be directly connected to each other or indirectly connected to each other via at least one third party, which can be a fluid passage such as a pipe, a channel, a conduit, a flow guide, a hole, a slot, etc. or a chamber allowing the fluid to flow therethrough or a combination thereof.

Claims

1. A range hood comprising a first housing (11), a second housing (12) and a hood (6), the first housing (11) being at least partially wrapped around the second housing (12) and at least partially located below the second housing (12), the first housing (11) being capable of moving up and down relative to the second housing (12); the range hood further comprising a second ventilation component (32) arranged on the second housing (12) and a first ventilation component (31); characterized in that: a control panel (5) is arranged 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), so that the control panel (5) is kept below the second housing (12) when the first housing (11) is moving up and down, the hood (6) is arranged on the first housing (11), the hood (6) is formed with a suction opening (62) on it, and the first ventilation component (31) is arranged at the suction opening (62); the 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 hood (6) is b2, and on the vertical plane extending forward and backward, the angle between the line connecting the operating center of the control panel (5) to the front side of the hood (6) and the vertical direction is δ, tan δ = a1 / b2; the range hood can be in a non-working state in which 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, wherein H1 is the height of the second housing (12), H2 is the height of the first housing (11) and the hood (6) jointly located below the second housing (12), and H2 = b1 + b2 + b3 + h2 + a, wherein 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 of the hood (6) to the bottom of the first housing (11), a is the installation gap between the top of the part 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 hood (6); the above parameters satisfy a1≥0 mm and 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 side wall of the second housing (12) and the bottom of the first housing (11); the widths of the first housing (11) and the second housing (12) in the left-right direction are adapted, and the control panel (5) is located directly in front of the second housing (12); b3 = 0, the hood satisfies h2 = 20-30 mm; the range hood further comprises a partition plate (15) separating the control panel (5) and the suction opening (62); the second ventilation component (32) is arranged on the bottom of the second housing (12) or inside the second housing (12). ​ ​ ​ ​ ​ ​ 2. The hood according to claim 1, characterized in that: ​ 3. The hood according to claim 1, characterized in that: ​ 4. The hood according to claim 1, characterized in that: ​ 5. The hood according to claim 1, characterized in that: ​ 6. The hood according to claim 5, characterized in that: The first ventilation component (31) comprises a first ventilation component body (311) and a first ventilation hole (312) provided on the first ventilation component body (311), wherein the first ventilation component body (311) gradually extends downwardly from front to rear, and the second ventilation component (32) comprises a second ventilation component body (321) and a second ventilation hole (322) provided on the second ventilation component body (321), wherein the second ventilation component body (321) comprises a first portion (3211) gradually extending downwardly from front to rear; The range hood can at least be in a state where the first housing (11) is raised to a state where the first ventilation component (31) and the second ventilation component (32) are in close proximity, in which state the maximum distance between the first portion (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 hood according to claim 6, characterized in that: The second ventilation component body (321) of the second ventilation component (32) further comprises a second portion (3212) protruding relative to the first portion (3211) in a direction away from the first ventilation component (31), wherein a vertical distance d2 is provided between the highest point of the second portion (3212) and a reference plane on which the first portion (3211) is located, and d2 ≥ 5 mm is satisfied.

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

9. The hood according to claim 5, characterized in that: The range hood further comprises a fan system (2) at least partially disposed within the second housing (12); the second ventilation component (32) comprises a second ventilation component body (321) and a second ventilation hole (322) provided 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 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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