Double-chamber range hood

Abstract

The present invention discloses a dual-chamber range hood, which belongs to the technical field of household appliances and is designed to solve the problems of poor exhaust efficiency of existing dual-chamber range hoods. The dual-chamber range hood of the present invention comprises: a housing, a fan assembly, and a guide plate. The guide plate comprises a front side, a rear side, and a diverter ridge located between the front side and the rear side. The horizontal distance L5 between the diverter ridge and the front side is greater than the horizontal distance L4 between the diverter ridge and the rear side. The dual-chamber range hood provided by the present invention simulates the internal airflow movement law based on numerical simulation technology, thereby designing a guide plate structure suitable for the dual-chamber range hood, ensuring that oil smoke can enter the fan assembly more smoothly and achieve higher oil smoke exhaust efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a double-chamber range hood. Background Art

[0002] A range hood is a kitchen appliance that uses a fan to collect and expel cooking fumes. Existing range hoods typically have two exhaust windows at the bottom of their housing, housing a fan. The fan typically includes a front air inlet and a rear air inlet, each corresponding to one of the two exhaust windows.

[0003] In existing range hoods, the distance between the front air inlet and the inner wall of the shell is usually larger, so the oil smoke is more easily discharged from the front air inlet; the fan motor and other structures are usually arranged near the rear air inlet, and the distance between the rear air inlet and the inner wall of the shell is relatively small, so the oil smoke discharge resistance at the rear air inlet becomes larger, causing some oil smoke to bypass the front air inlet for discharge.

[0004] In order to allow the oil smoke generated during cooking to enter the fan more smoothly, a guide device is usually set at the bottom of the fan. The existing guide device usually includes a diverter portion protruding downward from the bottom surface, and upwardly protruding curved surfaces are formed from the diverter portion to the left and right sides. The diverter portion is basically aligned with the position between the two exhaust windows at the bottom of the shell, with the purpose of guiding the oil smoke entering from the two exhaust windows to the front air inlet and the rear air inlet respectively. However, because the front air inlet and the rear air inlet have different resistance to the flow of oil smoke, the diverter portion blocks the part of the oil smoke that needs to be discharged around the front air inlet, which reduces the working efficiency of the range hood and has a poor exhaust effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a dual-chamber range hood, which can allow more oil smoke to be discharged from the front air inlet of the fan assembly, thereby improving the oil smoke exhaust effect.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A dual-chamber range hood comprises: a shell, a first exhaust window and a second exhaust window being provided at the bottom thereof; a fan assembly, comprising a front air inlet, a rear air inlet and a top exhaust port, one of the front air inlet and the rear air inlet being located within the exhaust range of the first exhaust window, and the other being located within the exhaust range of the second exhaust window; and a guide plate, arranged below the fan assembly and above the first exhaust window and the second exhaust window; the guide plate comprises a front side edge connected to the edge of the front air inlet, a rear side edge connected to the edge of the rear air inlet, and a diverter ridge located between the front side edge and the rear side, the horizontal distance L5 between the diverter ridge and the front side being greater than the horizontal distance L4 between the diverter ridge and the rear side.

[0008] In particular, an upward convex front side curved surface is provided between the diverter ridge and the front side edge, and / or an upward convex rear side curved surface is provided between the diverter ridge and the rear side edge.

[0009] In particular, the shape of the front curved surface and / or the rear curved surface is obtained by B-spline curve fitting.

[0010] In particular, the dual-chamber range hood also includes an oil return assembly, which includes an inner oil channel, an outer oil channel, an oil collecting cup and an oil collecting pipe, and the oil collecting cup and the oil collecting pipe are connected; a fan oil drain hole is provided on the fan assembly, one end of the inner oil channel is connected to the fan oil drain hole, and the other end of the inner oil channel is connected to the oil collecting cup; the outer oil channel is located at the bottom of the guide plate and is connected to the oil collecting cup.

[0011] In particular, the oil return assembly also includes an external oil channel housing, in which the external oil channel is located; the external oil channel housing is provided with an external oil channel oil return hole and / or an external oil channel oil return groove, and the external oil channel oil return hole and / or the external oil channel oil return groove are connected to the external oil channel.

[0012] In particular, a V-shaped mounting groove is further provided on the outer oil channel housing, and the diverter rib is provided in the V-shaped mounting groove.

[0013] In particular, the bottom surface of the outer oil channel housing is inclined, and an end of the outer oil channel away from the oil collecting cup is higher than an end close to the oil collecting cup.

[0014] In particular, the oil return assembly further comprises an oil baffle plate arranged at the edge of the inner oil channel port, and the oil baffle plate abuts against the fan assembly.

[0015] In particular, the dual-chamber range hood further includes a silencer assembly, which includes a silencer block and a damping pad. The silencer block is arranged in the guide plate, and the damping pad is arranged on the front side and / or the rear side.

[0016] Particularly, the interior of the sound-absorbing block is provided with sound-absorbing cotton, and the outer surface of the sound-absorbing block is provided with sound-absorbing holes.

[0017] The dual-chamber range hood provided by the present invention simulates the internal airflow movement law based on numerical simulation technology, thereby designing a guide plate structure suitable for the dual-chamber range hood, ensuring that the oil smoke can enter the fan assembly more smoothly, and the oil smoke exhaust efficiency is higher; the oil droplets in the fan assembly are quickly discharged to the oil return hole of the shell through the oil return assembly, which can reduce the accumulation of oil droplets on the wall, improve the oil return efficiency, reduce the number of cleanings, and reduce service costs; by setting a silencer assembly to eliminate the whistling sound generated when high-speed airflow passes through the small hole, the noise is reduced by reducing the transmission of sound waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a structural diagram of a dual-chamber range hood provided by a specific embodiment of the present invention;

[0019] Figure 2 This is one of the structural schematic diagrams of the fan assembly and the guide plate provided in the specific embodiment of the present invention;

[0020] Figure 3 This is the second structural diagram of the fan assembly and the guide plate provided in the specific embodiment of the present invention;

[0021] Figure 4 This is one of the schematic diagrams of the B-spline curve fitting method for the guide plate structure provided in the specific embodiment of the present invention;

[0022] Figure 5 This is the second schematic diagram of the B-spline curve fitting method for the guide plate structure provided by the specific embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the guide plate and the muffler assembly provided in a specific embodiment of the present invention;

[0024] Figure 7 Schematic diagram of the structure of the outer oil channel housing provided by a specific embodiment of the present invention;

[0025] Figure 8 yes Figure 7 A cross-sectional view of the inner and outer oil passage housings along a direction perpendicular to the axis;

[0026] Figure 9 is a front view of a muffler assembly provided in a specific embodiment of the present invention;

[0027] Figure 10 yes Figure 9 Middle AA section view.

[0028] In the picture:

[0029] 1. Shell; 2. Fan assembly; 3. Guide plate; 4. Oil return assembly; 11. First exhaust window; 12. Second exhaust window; 13. Fan housing; 14. Oil tank; 15. Shell oil return hole; 16. Shell oil cup; 21. Front air inlet; 22. Rear air inlet; 23. Top air exhaust; 24. Fan oil drain hole; 31. Front side; 32. Rear side; 33. Diverter rib; 34. Front curved surface; 35. Rear curved surface; 41. Inner oil channel; 42. Outer oil channel; 43. Oil collecting cup; 44. Oil collecting pipe; 45. Outer oil channel housing; 46. Outer oil channel oil return hole; 47. Outer oil channel oil return tank; 48. Oil baffle; 49. V-shaped mounting groove; 51. Silencer block; 52. Damping pad; 53. Silencer cotton; 54. Silencer hole. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0036] This embodiment provides a dual-chamber range hood for exhausting the fumes generated during cooking. Figures 1 to 3 As shown, the dual-chamber range hood includes a housing 1, a fan assembly 2, and a guide plate 3. A first exhaust window 11 and a second exhaust window 12 are provided at the bottom of the housing 1. Oil smoke generated during cooking enters the range hood through the first exhaust window 11 and the second exhaust window 12, respectively. The fan assembly 2 includes a front air inlet 21, a rear air inlet 22, and a top air outlet 23. One of the front air inlet 21 and the rear air inlet 22 is located within the exhaust range of the first exhaust window 11, and the other is located within the exhaust range of the second exhaust window 12. The guide plate 3 is disposed below the fan assembly 2 and above the first exhaust window 11 and the second exhaust window 12, and is used to guide the oil smoke entering the range hood from the first exhaust window 11 and the second exhaust window 12 to the front air inlet 21 and the rear air inlet 22, respectively.

[0037] like Figure 4As shown, the deflector 3 includes a front side edge 31 connected to the edge of the front air inlet 21, a rear side edge 32 connected to the edge of the rear air inlet 22, and a diverter rib 33 located between the front side edge 31 and the rear side edge 32. The horizontal distance L5 between the diverter rib 33 and the front side edge 31 is greater than the horizontal distance L4 between the diverter rib 33 and the rear side edge 32. That is, compared to the prior art, the diverter rib 33 is no longer located in the middle between the front air inlet 21 and the rear air inlet 22 of the fan assembly 2, but is slightly offset toward the rear air inlet 22, thereby allowing more oil smoke to flow toward the front air inlet 21 and fully utilizing the exhaust capacity of the front air inlet 21. Only a small amount of oil smoke enters the fan assembly 2 through the rear air inlet 22, preventing a large amount of oil smoke from accumulating there due to the low exhaust efficiency of the rear air inlet 22.

[0038] The eccentric design of the diverter rib 33 produces a fume diversion effect that matches the actual fume flow patterns shown in simulation diagrams (or streamline diagrams, which characterize the flow characteristics of airflow) generated through flow field simulation (using numerical calculation methods to simulate the flow characteristics of airflow within the range hood). This allows more fume to enter the fan assembly 2 through the wider space between the front air inlet 21 and the housing, eliminating exhaust difficulties at the rear air inlet 22 caused by motor obstruction and other factors, resulting in improved overall fume exhaust efficiency.

[0039] The specific installation method of the deflector 3 is not limited, as long as it can divert the oil smoke and reduce the flow resistance of the oil smoke. Preferably, the housing 1 also includes a fan housing 13 in the shape of a rectangular parallelepiped, the fan assembly 2 is disposed in the fan housing 13, and the top exhaust port 23 is connected to the outside of the fan housing 13. The deflector 3 is also disposed in the fan housing 13, and the two ends of the deflector 3 are fixedly connected to the fan housing 13. This installation structure is more stable, and no noticeable noise is generated due to the vibration of the deflector 3 during the exhaust of oil smoke.

[0040] To minimize resistance to the flow of oil fumes, an upwardly convex front curved surface 34 is provided between the diverter rib 33 and the front side 31, and / or an upwardly convex rear curved surface 35 is provided between the diverter rib 33 and the rear side 32. Compared to a flat surface, an upwardly convex curved surface (when viewed from the bottom of the range hood, the front curved surface 34 and / or the rear curved surface 35 are concave) accurately guides the flow of oil fumes without creating excessive resistance, resulting in high oil fume exhaust efficiency, low energy consumption of the fan assembly 2, and low noise during the exhaust process.

[0041] The specific shape of the front curved surface 34 and / or the rear curved surface 35 is not limited, as long as it facilitates the smooth flow of oil smoke. Preferably, the shape of the front curved surface 34 and / or the rear curved surface 35 is obtained by B-spline curve fitting. A curve is obtained by specifying a set of control points, and the general shape of the curve is controlled by these points. In other words, the contours of the front curved surface 34 and / or the rear curved surface 35 are fitted using a spline curve based on flow characteristics. This improves the compatibility between the deflector 3 and the range hood, reduces flow losses, enhances flow quality, and increases flow efficiency.

[0042] The preferred method of using B-spline curve fitting is: Figure 4 As shown, the starting point a of the left arc and the endpoint is point e connected to the fan assembly 2; the starting point a of the right arc and the endpoint on the other side are point d connected to the fan assembly 2. That is, point d and point e in the figure are the endpoints on both sides, and their positions are fixed. Point a is the location of the diverter rib 33. That is, point e and point d are set horizontally, and the location of point a is selected based on the results of numerical simulation. Through proportional conversion, starting from the bottom edge of the fan assembly 2, the height L1 of the diverter rib 33 (the distance between point a and the bottom edge of the fan assembly 2) is preferably 80mm-90mm. The horizontal length between the front side 31 and the rear side 32 of the guide plate 3 is L6. At the same time, the size conversion is performed, and the ratio of the horizontal distance L5 and L6 between the diverter rib 33 and the front side 31 is preferably 0.62-0.64.

[0043] When using B-spline curves for fitting, it is often necessary to clarify the control points. In this solution, a three-point controlled B-spline curve is used to fit the outer contour line. Taking arc ae as an example, with end a as the starting point, based on the flow direction of the streamline, the streamline tangent is made through point a, that is, ray ac. Similarly, a horizontal ray ec is made through point e. The two rays intersect at point c, and point c is the intersection of the two rays (c is the moving control point). The three control points of the control spline curve are clearly a, c, and e. The B-spline curve is used to fit the curve segment ae. The fitting curve is tangent to ray ec and ray ac respectively, ensuring good continuity. At the same time, the position of point a can be adjusted based on different subsequent models. After determining the direction of the streamline tangent, the boundary contour line can be drawn using the same method. Using points a, e, and c as control points, the B-spline curve is used to draw the curve on one side of the guide vane.

[0044] Draw the right-hand contour lines abd. Considering the larger rear intake angle of fan assembly 2, a turning point b is designed to better match the flow characteristics. The contour line is designed so that it passes through point b. The dimensions of point b are converted as follows: the distance between point b and the bottom edge of fan assembly 2 is L2, with the ratio of L2 to L1 preferably being 0.41-0.43. The horizontal distance between point b and rear edge 32 is L3, with the ratio of L3 to L4 preferably being 0.48-0.52. Figure 4In the figure, straight line fg passes through point b and is the streamline direction of the turning area. Starting from point a, a tangent ray af is made in the streamline direction on the right side of point a, which intersects with ray fg at point f. The three control ends abf are used to draw the B-spline curve abf. Similarly, the curve bgd is drawn. Since fg is the tangent direction of the streamline, the spline curve passing through point b can be guaranteed to be continuous. In summary, the complete outer contour line design is completed. The smoothness of the connection is guaranteed based on the B-spline curve. At the same time, the design considers the flow characteristics to make the designed streamline more consistent with the actual flow characteristics.

[0045] The ratio of L5 / L6 is 0.62-0.64, which is only a preferred embodiment. In different models of range hoods and under different working conditions, L5 / L6 may vary. When only the front air inlet 21 of the fan assembly 2 is working and the rear air inlet 22 is closed, L5 / L6 is preferably 1. That is, if Figure 5 As shown, the diverter rib 33 is completely moved to a position flush with the rear side 32, and the diverter rib 33 and the front side 31 are connected as a whole by a curved surface, which guides the oil smoke entering from the first exhaust window 11 and the second exhaust window 12 to the side air inlet 21 of the fan assembly 2.

[0046] The preferred method for B-spline curve fitting is: points a and b are set horizontally, with line bh vertically connected. Points c and d are derived from the streamline trajectory, and point h is a fixed point. Tangents to the streamlines through points c and d intersect at point f, depending on the streamline's condition. The tangent through point c intersects the tangent through point a at point e, and the tangent through point f intersects ray bh at point g. Connecting points aec, cfd, and dhg is accomplished by applying a B-spline curve.

[0047] Based on the above structure, Figures 1 to 3 、 Figure 6 as well as Figure 8 As shown, the dual-chamber range hood also includes an oil return assembly 4, which includes an inner oil channel 41, an outer oil channel 42, an oil collecting cup 43, and an oil collecting pipe 44. The oil collecting cup 43 and the oil collecting pipe 44 are interconnected. The fan assembly 2 is provided with a fan oil drain hole 24. One end of the inner oil channel 41 is connected to the fan oil drain hole 24, and the other end of the inner oil channel 41 is connected to the oil collecting cup 43. The outer oil channel 42 is located at the bottom of the guide plate 3 and is connected to the oil collecting cup 43. The fan oil drain hole 24 is preferably circular for higher oil drainage efficiency and easier processing. The oil collecting cup 43 is preferably fixedly connected to the fan housing 13, which makes the overall structure more stable and reduces vibration and noise.

[0048] The housing 1 includes an oil tank 14, a housing oil return hole 15, and a housing oil cup 16 connected to the housing oil return hole 15. The oil tank 14 is preferably provided on the smoke collecting chamber of the housing 1, and a plurality of housing oil return holes 15 are sequentially provided on the oil tank 14. When the impeller of the fan assembly 2 rotates, oil droplets in the oil smoke are thrown onto the inner wall surface of the volute of the fan assembly 2. The oil droplets flow along the fan oil discharge hole 24 into the internal oil passage 41, and then flow along the internal oil passage 41, the oil collecting cup 43, the oil collecting pipe 44, the oil tank 14, and the housing oil return hole 15 into the housing oil cup 16, thereby achieving efficient oil return, shortening the oil return time, reducing the accumulation of oil droplets on the wall surfaces along the way, reducing the number of cleanings, and lowering service costs.

[0049] The specific structure of the outer oil channel 42 is not limited, as long as it can guide the oil droplets condensed on the guide plate 3 to the oil collecting cup 43. Figure 7 and Figure 8 As shown, the oil return assembly 4 further includes an external oil channel housing 45, which encloses and forms the external oil channel 42. The external oil channel housing 45 is provided with an external oil channel return hole 46 and / or an external oil channel return groove 47, which are connected to the external oil channel 42. That is, the external oil channel return hole 46 and / or the external oil channel return groove 47 connect the inside and outside of the external oil channel housing 45. Oil droplets can pass through the external oil channel return hole 46 and / or the external oil channel return groove 47 to reach the external oil channel 42, and then flow through the external oil channel 42, the oil collecting cup 43, the oil collecting pipe 44, the oil groove 14, and the housing oil return hole 15 into the housing oil cup 16, thereby achieving efficient oil return of the oil droplets on the guide plate 3.

[0050] The shapes of the external oil channel oil return holes 46 and the external oil channel oil return grooves 47, as well as their relative positional relationship, are not limited, as long as they facilitate oil return. The external oil channel oil return holes 46 preferably comprise a plurality of rectangular holes arranged in a regular pattern, which improves processing efficiency and allows oil droplets to smoothly pass through the external oil channel oil return holes 46 and enter the external oil channel housing 45. The external oil channel oil return grooves 47 are preferably located closer to the center of the external oil channel housing 45 relative to the external oil channel oil return holes 46. This allows oil droplets condensed on the guide plate 3 to more smoothly pass through the external oil channel oil return grooves 47 and enter the external oil channel housing 45, resulting in higher oil return efficiency.

[0051] To simplify installation, the outer oil channel housing 45 is further provided with a V-shaped mounting groove 49, into which the diverter ridge 33 is mounted. This allows oil droplets condensed on the outer surface of the guide plate 3 to flow directly into the outer oil channel return holes 46 and outer oil channel return grooves 47 in the outer oil channel housing 45, resulting in high oil return efficiency.

[0052] Building on the aforementioned structure, the bottom surface of the outer oil channel housing 45 is inclined, with the end of the outer oil channel 42 farther from the oil collecting cup 43 being higher than the end closer to the oil collecting cup 43. Under the influence of gravity, oil droplets flow quickly toward the lower oil collecting cup 43, increasing oil return speed and completeness, while reducing the amount of oil droplets clinging to the outer oil channel 42.

[0053] In order to prevent the oil droplets from flowing smoothly into the inner oil passage 41 after being discharged from the oil drain hole 24 of the fan, Figure 6 As shown, the oil return assembly 4 further includes an oil baffle 48 disposed at the edge of the inner oil passage 41. The oil baffle 48 abuts against the outer wall of the volute of the fan assembly 2. The oil baffle 48 prevents oil droplets from splashing around, supports the fan assembly 2, and reduces noise during operation of the range hood by reflecting sound waves.

[0054] On the basis of the above structure, the double-chamber range hood also includes a silencer component, such as Figure 6 、 Figure 9 and Figure 10 As shown, the silencer assembly includes a silencer block 51 and a damping pad 52. The silencer block 51 is disposed within the deflector 3, and the damping pad 52 is disposed on the front side 31 and / or the rear side 32. Preferably, the bottom surface shape of the silencer block 51 is consistent with the bottom surface shape of the deflector 3, so that the bottom surface of the silencer block 51 can fully fit with the deflector 3, thereby achieving a better noise reduction effect. The two sides of the silencer block 51 are fixedly connected to the inner wall surface of the deflector 3, making the overall structure more stable and preventing the silencer block 51 and the deflector 3 from shaking relative to each other due to vibration during operation of the range hood. The damping pad 52 is preferably tightly fitted on the outer wall surface of the volute of the fan assembly 2 to achieve a better noise reduction effect.

[0055] The silencer block 51 is set in the guide plate 3 to be closer to the small holes for ventilation and oil return in the oil return component 4. The silencer block 51 can absorb the whistling sound of the flow in the small holes, reduce the working noise, and improve the comfort of use.

[0056] The specific structure of the muffler block 51 is not limited, as long as it effectively reduces noise. Preferably, the muffler block 51 is provided with muffler cotton 53 inside, and the outer surface of the muffler block 51 is provided with muffler holes 54. The muffler cotton 53 is a porous sound-absorbing material that converts sound energy into heat energy through friction and dissipates it, achieving resistive sound absorption.

[0057] To sum up, the dual-chamber range hood simulates the internal airflow movement law based on numerical simulation technology, thereby designing a guide plate 3 structure suitable for the dual-chamber range hood, ensuring that the oil smoke can enter the fan assembly 2 more smoothly, and the oil smoke exhaust efficiency is higher; the oil droplets in the fan assembly 2 are quickly discharged to the oil return hole 15 of the shell through the oil return assembly 4, which can reduce the accumulation of oil droplets on the wall, improve the oil return efficiency, reduce the number of cleanings, and reduce service costs; by setting a silencer assembly to eliminate the whistling sound generated when the high-speed airflow passes through the small hole, the noise is reduced by reducing the transmission of sound waves.

[0058] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A dual-chamber range hood, characterized in that: include: The shell (1) has a first exhaust window (11) and a second exhaust window (12) formed on its bottom; A fan assembly (2) comprising a front air inlet (21), a rear air inlet (22) and a top air outlet (23), wherein one of the front air inlet (21) and the rear air inlet (22) is located within the exhaust range of the first exhaust window (11), and the other of the two is located within the exhaust range of the second exhaust window (12); and A guide plate (3) is arranged below the fan assembly (2) and above the first exhaust window (11) and the second exhaust window (12); the guide plate (3) includes a front side edge (31) connected to the edge of the front air inlet (21), a rear side edge (32) connected to the edge of the rear air inlet (22), and a diverter ridge (33) located between the front side edge (31) and the rear side edge (32), wherein a horizontal distance L5 between the diverter ridge (33) and the front side edge (31) is greater than a horizontal distance L4 between the diverter ridge (33) and the rear side edge (32).

2. The dual-chamber range hood according to claim 1, characterized in that: An upward convex front side curved surface (34) is provided between the diverter ridge (33) and the front side edge (31), and / or an upward convex rear side curved surface (35) is provided between the diverter ridge (33) and the rear side edge (32).

3. The dual-chamber range hood according to claim 2, characterized in that: The shapes of the front curved surface (34) and / or the rear curved surface (35) are obtained by B-spline curve fitting.

4. The dual-chamber range hood according to any one of claims 1 to 3, characterized in that: The double-chamber range hood further comprises an oil return assembly (4), the oil return assembly (4) comprising an inner oil passage (41), an outer oil passage (42), an oil collecting cup (43) and an oil collecting pipe (44), the oil collecting cup (43) and the oil collecting pipe (44) being connected; a fan oil discharge hole (24) is provided on the fan assembly (2), one end of the inner oil passage (41) is connected to the fan oil discharge hole (24), and the other end of the inner oil passage (41) is connected to the oil collecting cup (43); the outer oil passage (42) is located at the bottom of the guide plate (3) and is connected to the oil collecting cup (43).

5. The dual-chamber range hood according to claim 4, characterized in that: The oil return assembly (4) further comprises an external oil passage housing (45), wherein the external oil passage (42) is located in the external oil passage housing (45); an external oil passage oil return hole (46) and / or an external oil passage oil return groove (47) are provided on the external oil passage housing (45), and the external oil passage oil return hole (46) and / or the external oil passage oil return groove (47) are connected to the external oil passage (42).

6. The dual-chamber range hood according to claim 5, characterized in that: The outer oil channel housing (45) is further provided with a V-shaped mounting groove (49), and the diverter rib (33) is arranged in the V-shaped mounting groove (49).

7. The dual-chamber range hood according to claim 5, characterized in that: The bottom surface of the outer oil channel housing (45) is inclined, and the end of the outer oil channel (42) away from the oil collecting cup (43) is higher than the end close to the oil collecting cup (43).

8. The dual-chamber range hood according to claim 4, characterized in that: The oil return assembly (4) further comprises an oil baffle (48) arranged at the edge of the port of the inner oil passage (41), and the oil baffle (48) abuts against the fan assembly (2).

9. The dual-chamber range hood according to any one of claims 1 to 3, characterized in that: The dual-chamber range hood further comprises a silencer assembly, the silencer assembly comprising a silencer block (51) and a damping pad (52), the silencer block (51) being arranged in the guide plate (3), and the damping pad (52) being arranged on the front side (31) and / or the rear side (32).

10. The dual-chamber range hood according to claim 9, characterized in that: The interior of the sound-absorbing block (51) is provided with sound-absorbing cotton (53), and the outer surface of the sound-absorbing block (51) is provided with sound-absorbing holes (54).

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