Range hood

Abstract

The invention belongs to the technical field of oil fume purification, and particularly discloses a range hood which comprises an exhaust fume collecting hood, a first flow guide part and a flow guide plate, the exhaust fume collecting hood comprises two side plates, a face plate and a back plate, the face plate and the back plate are oppositely arranged front and back, and the face plate, the back plate and the two side plates are used for forming a side exhaust fume collecting cavity; the flow guide plate is arranged in the side smoke collecting cavity and inclines towards the back plate from bottom to top, the flow guide plate and the lower portion of the panel are spaced to form a first smoke inlet, the first flow guide piece is arranged on the back face of the panel and located above the first smoke inlet, and a first flow guide face inclining upwards from front to back is formed on the first flow guide piece; the bottom edge of the first flow guide face is attached to the bottom edge of the panel, the included angle alpha between the first flow guide face and the panel is smaller than the included angle b between the flow guide plate and the panel, and the range hood is good in smoke suction effect.

Description

Technical Field

[0001] The present invention relates to the technical field of oil fume purification, and in particular to a range hood. Background Art

[0002] With the improvement of living standards, range hoods have become an indispensable appliance in people's kitchens. Range hoods operate based on the principles of fluid dynamics. A fan installed inside the range hood quickly draws away harmful fumes from stove combustion and cooking processes, exhausting them outdoors and purifying the kitchen environment. Top-mounted double-suction range hoods are widely used because they are aesthetically pleasing, do not infringe on cooking space, and have a sufficiently low-profile intake to absorb fumes directly where they rise.

[0003] However, the smoke inlet at the bottom of the top-side double-suction range hood is close to the stove, the internal flow path of the range hood is long, the smoke is not smooth, and it is easy to generate vortexes on the back of the panel, resulting in low smoke extraction efficiency. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a range hood which can improve the smoking effect.

[0005] The above technical problems are solved by the following technical solutions:

[0006] The range hood comprises a smoke hood, a guide plate and a first guide member, the smoke hood comprises two side panels and a front and rear oppositely arranged panel and back panel, the panel, the back panel and the two side panels are used to form a side smoke collection chamber; the guide plate is arranged in the side smoke collection chamber and is inclined from bottom to top toward the back panel, and the guide plate and the lower portion of the panel are spaced apart to form a first smoke inlet; the first guide member is arranged on the back side of the panel and is located above the first smoke inlet, and a first guide surface inclined upward from front to back is formed on the first guide member, the bottom edge of the first guide surface is in contact with the bottom edge of the panel, and the angle α between the first guide surface and the panel is smaller than the angle b between the guide plate and the panel.

[0007] Compared with the background technology, the range hood described in the present invention has the following beneficial effects: the range hood is provided with a first guide member in the smoke collecting hood, and after the smoke enters the side smoke collecting chamber through the first smoke inlet, the smoke flows toward the back plate under the guiding action of the guide plate and the first guide surface, thereby reducing the collision with the position of the panel close to the first smoke inlet, and it is difficult for vortices to form near the position of the panel close to the first smoke inlet, that is, the setting of the first guide surface reduces the possibility of vortices forming near the position of the panel close to the first smoke inlet.

[0008] It is worth emphasizing that a channel for oil smoke to pass through is formed between the first guide surface and the guide plate. The angle a between the first guide surface and the panel is smaller than the angle b between the guide plate and the panel, which means that the channel formed by the first guide surface and the guide plate gradually expands in the direction away from the first smoke inlet, so the oil smoke flow rate is reduced, the airflow is relatively more stable, and it is not easy to form vortices in the channel. In addition, the negative pressure formed at the first smoke inlet is high, the suction force is enhanced accordingly, and the smoking effect is better.

[0009] In one embodiment, the angle formed by the surface where the guide plate is located and the surface where the first guide surface is located is d, and 7°≤d≤15°.

[0010] In one embodiment, the outer surface of the first flow guide is a structure that gradually contracts from front to back.

[0011] In one embodiment, the first guide member further includes a second guide surface and a third guide surface. The first guide surface and the outer surface of the first guide member are triangular pyramid structures. One side of the second guide surface and the third guide surface overlap to form a ridge line M.

[0012] In one embodiment, the range hood further includes a fan and a fan cover, wherein the fan cover is arranged on the top of the smoke collection hood and is connected to the side smoke collection chamber, the fan is located in the fan cover, and the outlet of the fan deviates from the central axis N of the panel perpendicular to the left and right directions, the perpendicular midline of the bottom edge of the first guide surface is projected toward the panel and coincides with the central axis N, and the ridge line M deviates from the central axis N toward the outlet of the fan.

[0013] In one embodiment, the first flow guide is gathered in a line, the first flow guide is a bilaterally symmetrical structure, and the longitudinal cross-section of the first flow guide is V-shaped or a streamlined shape that is convex toward the back plate.

[0014] In one embodiment, the range hood includes a second air guide and a third air guide, wherein the second air guide and the third air guide are respectively attached to the left and right sides of the first air guide, the second air guide has a fifth air guide surface, and the third air guide has a sixth air guide surface, and the bottom edges of the fifth air guide surface and the sixth air guide surface are both attached to the upper edge of the first smoke inlet;

[0015] The thickness of the second flow guide and the thickness of the third flow guide are both smaller than the thickness of the first flow guide, or the thickness of the second flow guide and the third flow guide gradually becomes thinner from one end connected to the first flow guide to the other end.

[0016] In one embodiment, the range hood further includes a fan and a fan cover, wherein the fan cover is arranged on the top of the smoke collecting hood and is connected to the side smoke collecting chamber, the fan is located in the fan cover, and the outlet of the fan is arranged to deviate from the central axis N of the panel perpendicular to the left and right directions, and the symmetrical axis of the first air guide member deviates from the central axis N on the side close to the outlet direction of the fan.

[0017] In one embodiment, the range hood further includes an oil guide plate and an oil cup, the oil cup is arranged at the lower part of the smoke hood, the oil guide plate is arranged below the first flow guide member, one end of the oil guide plate is connected to the panel, and the other end of the oil guide plate is arranged to be gradually inclined downward from front to back; a smoke inlet hole is provided on the oil guide plate.

[0018] In one embodiment, the first flow guide cooperates with the panel to form a closed space, a sound-absorbing hole is provided on the first flow guide, and a sound-absorbing material is provided inside the first flow guide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a range hood provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of a range hood provided in one embodiment of the present invention with the back panel hidden;

[0021] Figure 3 for Figure 2 A cross-sectional view of a range hood in FIG.

[0022] Figure 4 for Figure 3 A magnified schematic diagram of point A in the middle;

[0023] Figure 5 for Figure 2 A diagram showing the positional relationship between the panel of the range hood and the first air guide member;

[0024] Figure 6 for Figure 5 Side view of;

[0025] Figure 7 A diagram showing the positional relationship between a panel and a first air guide of a range hood provided in yet another embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the three-dimensional structure of a range hood with its back panel hidden, provided in another embodiment of the present invention;

[0027] Figure 9 for Figure 8 A diagram showing the positional relationship between the panel of the range hood and the first air guide member;

[0028] Figure 10 for Figure 9 Side view of;

[0029] Figure 11 This is a schematic diagram of the three-dimensional structure of a range hood provided by another embodiment of the present invention with the back panel hidden;

[0030] Figure 12 for Figure 11 A diagram showing the positional relationship between the oil fume absorbing panel and the first, second and third flow guides;

[0031] Figure 13 for Figure 12 side view.

[0032] Description of labels:

[0033] 1. Smoke hood; 11. Panel; 12. Back panel; 13. Side panel; 14. Top panel; 15. Lampshade panel; 16. Control panel; 17. Side smoke collection chamber; 18. Top smoke collection chamber; 19. First smoke inlet; 110. Second smoke inlet; 21. Guide plate; 22. First guide member; 221. First guide surface; 222. Second guide surface; 223. Third guide surface; 224. Fourth guide surface; 23. Second guide member; 231. Fifth guide surface; 24. Third guide member; 241. Sixth guide surface; 3. Fan cover; 4. Oil guide plate; 41. Smoke inlet; 5. Fan; 6. Oil cup. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0036] The terms "first", "second", "third", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0037] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] By studying the existing top-side double-range hood smoke flow chart, it is found that when the rising oil fume enters the range hood from the lower smoke inlet, the fluid flow direction changes, which will cause impact near the lower smoke inlet of the panel of the range hood, resulting in backflow and vortex, and further causing low air suction efficiency of the top-side double-range hood. Based on this, the range hood proposed in the embodiments of the present application can reduce the vortex near the lower smoke inlet of the panel to improve the smoothness of the range hood smoke suction, and further improve the air suction efficiency of the top-side double-range hood.

[0039] Reference Figures 1-13 As shown in the drawings, the range hood proposed in the embodiments of the present application includes a smoke collecting hood 1, a flow guide plate 21, a fan 5 and a fan cover 3.

[0040] The fume hood 1 is used to support and fix other components such as the fan cover 3 and the deflector 21. Specifically, the fume hood 1 includes a front panel 11 (the front panel 11) and a back panel 12 (the back panel 12) arranged opposite each other. When the range hood is installed, the back panel 12 can be fixed to the wall to fix the overall position of the range hood, while the front panel 11 faces the user. Therefore, the back panel 12 can extend in the vertical direction to better fit the wall, thereby improving the stability of the range hood when fixed to the wall. The smoke hood 1 also includes two side panels 13. The left and right sides of the panel 11 and the back panel 12 are connected by the back panel 12. The panel 11, the back panel 12 and the two side panels 13 are used to form a side smoke collection chamber 17 connected to the fan hood 3. The guide plate 21 is arranged in the side smoke collection chamber 17. The guide plate 21 and the lower part of the panel 11 are spaced apart to form a first smoke inlet 19. The guide plate 21 is inclined from bottom to top toward the back panel 12 to guide the oil smoke, change the flow direction of the oil smoke after entering the first smoke inlet 19, and reduce the vortex formed by the direct collision of the oil smoke and the back panel 12. The fan cover 3 is arranged above the smoke hood 1. The fan is located in the fan cover 3 and is used to form a negative pressure suction so that the oil smoke can enter the side smoke collection chamber 17 through the first smoke inlet 19. The fan can be a centrifugal fan, an axial flow fan, etc.

[0041] In one embodiment, the panel 11 is inclined from bottom to top away from the back panel 12, so that the cross-sectional area of ​​the side smoke collecting chamber 17 gradually expands from bottom to top, the oil smoke flow rate decreases, the airflow is relatively more stable, and the generation of vortex is reduced.

[0042] In one embodiment, the range hood is used above two stoves spaced apart in the left-right direction. In order to absorb the smoke as much as possible, the first smoke inlet 19 is configured as a strip-shaped opening extending in the left-right direction.

[0043] Continue to refer Figure 1 and Figure 2 As shown, the smoke hood 1 also includes a top plate 14, a lampshade plate 15 and a control panel 16. The top plate 14 and the lampshade plate 15 are arranged relative to each other in the up and down directions. The back plate 12 is connected to the rear end of the top plate 14, and the panel 11 is connected to the rear end of the lampshade plate 15. The two side plates 13 are respectively arranged on the left and right sides of the top plate 14 and connect the top plate 14 and the lampshade plate 15. The control panel 16 is arranged at the front end of the top plate 14 and the lampshade plate 15 and connects the top plate 14 and the lampshade plate 15. The top plate 14, the lampshade plate 15, the side plates 13 and the control panel 16 are used to form a top smoke collecting chamber 18 connected to the side smoke collecting chamber 17. The fan cover 3 is arranged on the top plate 14 and connected to the top smoke collecting chamber 18 and then connected to the side smoke collecting chamber 17. At this time, the smoke hood 1 is arranged to be approximately in the shape of a "7". Specifically, in order to further improve the smoking efficiency, a second smoke inlet 110 for oil smoke to enter the top smoke collecting chamber 18 is opened on the lampshade plate 15.

[0044] Continue to refer Figure 2As shown, smoke tends to accumulate on the lower side of the panel 11 facing the back panel 12, forming a vortex, which affects air intake efficiency. Therefore, the range hood further includes a first deflector 22, which is disposed on the back side of the panel 11. The first deflector 22 has a first deflector surface 221 formed thereon, which slopes upward from front to back. The bottom edge of the first deflector surface 221 abuts the bottom edge of the panel 11, and the angle α between the first deflector surface 221 and the panel 11 is smaller than the angle b between the deflector 21 and the panel 11.

[0045] The above-mentioned range hood is provided with a first guide member 22 in the smoke collecting hood 1. After the oil smoke enters the side smoke collecting chamber 17 through the first smoke inlet 19, it flows toward the back panel 12 under the guiding action of the first guide surface 221, reducing the collision with the position of the panel 11 close to the first smoke inlet 19. It is difficult for an eddy current to form near the position of the panel 11 close to the first smoke inlet 19, thereby reducing the possibility of an eddy current forming near the position of the panel 11 close to the first smoke inlet 19.

[0046] It is worth emphasizing that a channel for oil smoke to pass through is formed between the guide plate 21 and the first guide surface 221. The angle a between the first guide surface 221 and the panel 11 is smaller than the angle b between the guide plate 21 and the panel 11, which means that the channel formed by the guide plate 21 and the first guide surface 221 gradually expands in the direction away from the first smoke inlet 19, thereby reducing the flow rate of oil smoke. The airflow is relatively more stable and it is not easy to form vortices in the channel. In addition, the wind pressure formed at the first smoke inlet 19 is high, the suction force is enhanced accordingly, and the smoking effect is better.

[0047] Assume that the angle between the guide plate 21 and the back plate 12 is c, 45°≤c≤60°, for example, c=45°, c=47°, c=50°, c=55°, or c=60°. If c is too large, the oil smoke easily collides with the guide plate 21 and generates vortices. If c is too small, the oil smoke cannot achieve a good guiding effect and easily collides with the back plate 12. Based on this, assume that the angle formed by the surface of the guide plate 21 and the surface of the first guide surface 221 is d, 7°≤d≤15°, for example, d=7°, d=8°, d=9°, d=10°, d=11°, d=12°, d=13°, d=14°, or d=15°. If d is too large, the first guide surface 221 is less effective in directing the oil smoke toward the back plate 12. If d is too small, the smoking effect is poor.

[0048] To prevent a sudden change in the shape of the first air guide 22, which could lead to a sudden change in the effective ventilation area of ​​the side smoke collecting chamber 17 and, in turn, the formation of vortices, the first air guide 22 is designed to gradually converge from front to back. That is, the outer perimeter of the cross-section of the first air guide 22 parallel to the panel 11 gradually decreases from front to back. Preferably, the height of the first air guide 22 should be consistent with the height of the panel 11 to reduce the possibility of vortices forming in the area between the upper end of the first air guide 22 and the panel 11, further improving air intake efficiency.

[0049] It is understandable that the first flow guide 22 can be gathered at one point, a line, or a surface. When the first flow guide 22 is gathered at one point, the first flow guide 22 can adopt a polygonal pyramid side structure, that is, a polygonal pyramid structure buckled on the panel 11. In this case, the first flow guide surface 221 is a triangle, or the first flow guide surface 221 can also be set to other polygons, such as a pentagon. When the first flow guide 22 is gathered at a line, the longitudinal section of the first flow guide 22 is a V-shape of the same shape and size or a streamlined shape that is convex toward the back panel 12. In this case, the first flow guide 22 is The left-right symmetrical structure takes the longitudinal cross-section of the first flow guide member 22 as an example. In addition to the first flow guide surface 221, the first flow guide member 22 also includes a fourth flow guide surface 224. The first flow guide surface 221 and the fourth flow guide surface 224 are both set to be rectangular. The bottom edge of the first flow guide surface 221 is attached to the bottom edge of the panel 11, and the upper edge of the first flow guide surface 221 is connected to the bottom edge of the fourth flow guide surface 224; and when the first flow guide member 22 is folded to one side, the longitudinal cross-section of the first flow guide member 22 is a trapezoid.

[0050] Since there is only one fan 5 and it is usually located in the center of the two burners, the oil smoke generated by the two burners will be gathered towards the center of the two burners under the action of the fan, resulting in a long air intake path and low suction force, resulting in low air intake efficiency. Figure 2 and Figure 5 As shown, when the first guide surface 221 is configured as a triangle, the first guide member 22 can create a stronger negative pressure on the left and right sides of the first smoke inlet 19. In other words, the first guide member 22 not only guides the flow but also diverts it. Given a certain power level for the fan 5, the suction force corresponding to the location of the first smoke inlet 19 corresponding to the stove is stronger, effectively drawing the smoke into the side smoke collection chamber 17.

[0051] Specifically, the center-to-center distance between two burners is typically 450mm, while the diameter of common pots ranges from 300mm to 360mm. Based on the assumption that the first deflector surface 221 is triangular, the longest length (left-to-right dimension) of the first deflector 22 is L, and is within the range of (450-360)mm ≤ L ≤ (450-300 / 4*2)mm, i.e., 90mm ≤ L ≤ 300mm. When L is within this range, the negative pressure area created by the fan 5 can more accurately align with the cooktop. The thickness (fore-to-aft dimension) H of the first deflector 22 is sufficient as long as it does not interfere with the backplate 12.

[0052] In one embodiment, continue to refer to Figure 2-Figure 7As shown, continuing with the premise that the first guide surface 221 is configured as a triangle, the first guide member 22 further includes a second guide surface 222 and a third guide surface 223. Both the second guide surface 222 and the third guide surface 223 are configured as triangles. The base of the first guide surface 221 is affixed to the base of the panel 11. The two sides of the first guide surface 221 are connected to the second guide surface 222 and the third guide surface 223, respectively. The second guide surface 222 and the third guide surface 223 each have one side affixed to the panel 11. The remaining sides of the second guide surface 222 and the third guide surface 223 overlap to form a ridge line M, i.e., the outer surface of the first guide member 22 has a triangular pyramid structure. Optionally, the first guide member 22 is bonded to the panel 11. In this case, the longest length of the first guide member 22 in the left-right direction is the length of the base of the first guide surface 221. The first guide member 22 can cooperate with the panel 11 to form a triangular pyramid-shaped closed space, or the first guide member 22 and the panel 11 are stamped integrally to form a triangular pyramid-shaped groove.

[0053] When the first guide member 22 is gathered in a line, the length of the first guide member 22 should be as long as possible based on the consideration of guiding as much oil smoke as possible. Figures 8-10 As shown, given that the panel 11 is typically 860mm-880mm long and that hooks are provided on both the left and right sides of the panel 11 for securing the panel 11 to the side panels, the length of the first deflector 22 is between 780mm and 800mm. To allow smoke to flow from below to above the first deflector 22, a gap should exist between the first deflector 22 and the back panel 12. For example, assuming the thickness of the side smoke collecting chamber 17 along the front-to-back direction is between 80mm and 100mm, the thickness of the first deflector 22 is between 20mm and 50mm.

[0054] Based on the comprehensive consideration of flow guidance and flow diversion, the first flow guide 22 can also be set to be relatively short to allow the smoke to be diverted from the left and right sides of the first flow guide 22. Figure 11-13 As shown, the range hood further includes a second air guide 23 and a third air guide 24. The second air guide 23 is disposed on the left side of the first air guide 22 and abuts the left end surface of the first air guide 22. The third air guide 24 is disposed on the right side of the first air guide 22 and abuts the right end surface of the first air guide 22. To achieve a diversion effect, the thickness of the second air guide 23 and the third air guide 24 are both less than the thickness H of the first air guide 22, or the thickness of the second air guide 23 and the third air guide 24 gradually decreases from the end connected to the first air guide 22 to the other end. It is understood that when the thickness of the second air guide 23 and the third air guide 24 gradually decreases from the end connected to the first air guide 22 to the other end, the first air guide 22, the second air guide 23, and the third air guide 24 can be integrally formed to reduce manufacturing difficulty.

[0055] To achieve a deflecting effect, the second deflector 23 has a fifth deflector surface 231, and the third deflector 24 has a sixth deflector surface 241. The bottom edges of the fifth deflector surface 231 and the sixth deflector surface 241 are both aligned with the bottom edge of the panel 11. For example, when the longitudinal cross-section of the first deflector 22 is configured as a V-shape, the longitudinal cross-sections of the second and third deflectors 23 and 24 are also configured as V-shapes; or, when the longitudinal cross-section of the first deflector 22 is configured as a streamlined shape convex toward the back panel 12, the longitudinal cross-sections of the second and third deflectors 23 and 24 are also configured as streamlined shapes convex toward the back panel 12.

[0056] For example, the second guide member 23 and the third guide member 24 have the same thickness, H1. Of course, the second guide member 23 and the third guide member 24 may also have different thicknesses to balance the smoke intake from the left and right sides of the first smoke inlet 19.

[0057] It is worth emphasizing that, considering the diversion effect, the larger the difference between H and H1, the better. However, considering the diversion effect, H1 cannot be too small. When manufacturing the first, second, and third diverters 22, 23, and 24, the difference between H and H1 can be set according to actual needs, without specific limitations. In one embodiment, H1 is between 20 mm and 50 mm. If H1 is too high, it will easily affect the smoke intake of the first smoke inlet 19. If H1 is too low, the diversion effect will be poor. H only needs to ensure that the first diverter 22 does not interfere with the back plate 12.

[0058] Specifically, the total length of the first flow guide 22 , the second flow guide 23 and the third flow guide 24 is between 780 mm and 800 mm, and the length L of the first flow guide 22 is in the range of 90 mm≤L≤300 mm.

[0059] It can be understood that the angle between the fifth guide surface 231 and the sixth guide surface 241 and the panel 11 can be the same as or different from a, but it should be ensured that the angle between the fifth guide surface 231 and the sixth guide surface 241 and the panel 11 is also greater than the angle between the guide plate 21 and the panel 11, so as to reduce the possibility of vortex formation between the guide plate 21 and the fifth guide surface 231 and between the guide plate 21 and the sixth guide surface 241.

[0060] In one embodiment, the outlet of the fan 5 (not shown in the figure) is set to deviate from the central axis N of the panel 11 perpendicular to the left and right directions. In order to maintain the balance of the oil smoke passing through the left and right sides of the first guide member 22, based on the premise that the outer surface of the first guide member 22 is a triangular pyramid structure and the perpendicular bisector of the bottom edge of the first guide surface 221 is projected in the direction of the panel 11 and coincides with the central axis N, the ridge line M of the first guide member 22 is set to deviate from the central axis N of the panel 11 in the direction of the outlet of the fan 5.

[0061] Take the outlet of the fan 5 as an example, which deviates from the right side of the central axis N of the panel 11 perpendicular to the left and right directions. Figure 7 As shown, the ridgeline M of the first air guide 22 deviates to the right. Specifically, the length L1 of the bottom edge of the first air guide surface 221 to the left of the ridgeline M is greater than the length L2 of the bottom edge of the first air guide surface 221 to the right of the ridgeline M. This allows more airflow to enter from the left side of the first smoke inlet 19, balancing the smoke extraction effect on both sides. For example, considering the size of the fan used in a typical range hood, the rightward deviation of the ridgeline M of the first air guide 22 does not exceed 50 mm.

[0062] When the range hood includes a second air guide 23 and a third air guide 24, the direction of the outlet of the symmetrical axial fan 5 of the first air guide 22 deviates from the central axis N of the panel 11, so that the lengths of the second air guide 23 and the third air guide 24 are different, thereby achieving adjustment of the air intake volume on the left and right sides of the first air guide 22.

[0063] Still taking the example of the outlet of the fan 5 deviating from the right side of the central axis N of the panel 11 perpendicular to the left and right directions, the symmetry axis of the first air guide 22 deviates from the central axis N of the panel 11 to the right. At this time, the length of the second air guide 23 is greater than the length of the third air guide 24, so that more smoke can enter from the left side of the first smoke inlet 19, balancing the smoking effects on the left and right sides.

[0064] Based on the premise that the first air guide 22 cooperates with the panel 11 to form a closed space, the first air guide 22 is provided with a sound-absorbing hole so that oil smoke entering the range hood can easily generate noise. In order to reduce the noise, the first air guide 22 is provided with a sound-absorbing hole. Sound-absorbing material is arranged in the first air guide 22. The noise in the side smoke collecting chamber 17 can enter the first air guide 22 through the sound-absorbing hole and be absorbed by the sound-absorbing material, thereby realizing the effect of the sound-absorbing material absorbing the noise in the side smoke collecting chamber 17.

[0065] In one embodiment, an array of muffler holes is arranged in the first air guide 22, and the aperture ratio of the muffler holes in the first air guide 22 is between 15% and 25%, for example, 15%, 20%, or 25%. The aperture ratio represents the ratio of the total area of ​​the muffler holes to the total area of ​​the first air guide 22. If sound-absorbing material is provided within the first air guide 22, a higher aperture ratio of the first air guide 22 will result in greater absorption of noise within the side smoke collection chamber 17 by the sound-absorbing material. Based on a comprehensive consideration of the structural strength and sound-absorbing effect of the first air guide 22, the aperture ratio of the muffler holes in the current embodiment is set at 20%.

[0066] Optionally, the shape of the silencer hole can be circular, oval, square, pentagonal, etc., without specific limitation here, as long as the noise can pass through the silencer hole and contact the sound-absorbing material, and then be absorbed by the sound-absorbing material. It should be emphasized that since the noise generated near the first smoke inlet 19 is mainly high-frequency wind noise, the aperture of the silencer hole is between 1mm and 2mm.

[0067] refer to Figure 2 As shown, the smoke hood 1 also includes an oil guide plate 4 and an oil cup 6. The oil cup 6 is located at the bottom of the smoke hood 1 and has an upward opening. The oil cup 6 is in the shape of an elongated strip extending left and right, and is used to receive oil stains flowing down from the panel 11. The oil guide plate 4 is located below the first deflector 22. One end of the oil guide plate 4 is connected to the panel 11, and the other end of the oil guide plate 4 is arranged to gradually tilt downward from front to back to guide the oil accumulated on the panel so that the oil can accurately fall into the oil cup 6 through the opening of the oil cup 6. On this basis, in order to prevent the smoke from bypassing the oil guide plate 4 and forming a vortex between the first deflector surface 221 in the gap and the oil guide plate 4, the oil guide plate 4 is provided with a smoke inlet 41. The smoke can enter the side smoke collection chamber 17 through the smoke inlet 41, thereby reducing the interference of the oil guide plate 4 on the smoke entering the side smoke collection chamber 17. For example, multiple smoke inlet holes 41 are arranged on the oil guide plate 4 at intervals along the left and right directions. More specifically, in order to improve the stability of the oil guide plate 4 connected to the panel 11, a connecting plate is provided on the panel 11, which is fixed to the panel 11 and integrally formed with the oil guide plate 4. It is understandable that at this time, the first guide member 22 is attached to the connecting plate.

[0068] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The specific contents of the above-mentioned specific embodiments merely represent several embodiments of the present invention. While the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A range hood, characterized in that: include: A smoke collecting hood (1), the smoke collecting hood (1) comprising two side panels (13) and a front panel (11) and a back panel (12) arranged opposite to each other in the front and rear directions, the front panel (11), the back panel (12) and the two side panels (13) being used to form a side smoke collecting chamber (17); A guide plate (21) is disposed in the side smoke collecting chamber (17) and is inclined from bottom to top toward the back plate (12), and the guide plate (21) is spaced from the lower portion of the panel (11) to form a first smoke inlet (19); A first flow guide (22) is provided on the back of the panel (11) and above the first smoke inlet (19); a first flow guide surface (221) is formed on the first flow guide (222) and is inclined upward from front to rear; the bottom edge of the first flow guide surface (221) is in contact with the bottom edge of the panel (11); and an angle α between the first flow guide surface (221) and the panel (11) is smaller than an angle b between the flow guide (21) and the panel (11).

2. The range hood according to claim 1, characterized in that The angle formed by the surface where the guide plate (21) is located and the surface where the first guide surface (221) is located is d, and 7°≤d≤15°.

3. The range hood according to claim 1, characterized in that: The outer surface of the first flow guide (22) is in a structure that gradually contracts from front to back.

4. The range hood according to claim 3, characterized in that: The first flow guide member (22) further comprises a second flow guide surface (222) and a third flow guide surface (223); the outer surface of the first flow guide member (22) is in a triangular pyramid structure; one side of the second flow guide surface (222) and one side of the third flow guide surface (223) overlap to form a ridge line M.

5. The range hood according to claim 4, characterized in that: The range hood further comprises a fan (5) and a fan cover (3), wherein the fan cover (3) is arranged on the top of the smoke collecting hood (1) and is connected to the side smoke collecting chamber (17), the fan (5) is located in the fan cover (3), the outlet of the fan (5) deviates from the central axis N of the panel (11) perpendicular to the left and right directions, the perpendicular midline of the bottom edge of the first guide surface (221) in the direction of the panel (11) coincides with the central axis N, and the ridge line M deviates from the central axis N in the direction close to the outlet of the fan (5).

6. The range hood according to claim 3, characterized in that: The first flow guide (22) is gathered in a line, the first flow guide (22) is a bilaterally symmetrical structure, and the longitudinal cross-section of the first flow guide (22) is V-shaped or a streamlined shape that is convex toward the back plate (12).

7. The range hood according to claim 6, characterized in that: The range hood comprises a second flow guide member (23) and a third flow guide member (24); the second flow guide member (23) and the third flow guide member (24) are respectively attached to the left and right sides of the first flow guide member (22); the second flow guide member (23) has a fifth flow guide surface (231); the third flow guide member (24) has a sixth flow guide surface (241); the bottom edges of the fifth flow guide surface (231) and the sixth flow guide surface (241) are both attached to the bottom edge of the panel (11); The thickness of the second flow guide (23) and the thickness of the third flow guide (24) are both smaller than the thickness of the first flow guide (22); or, the thickness of the second flow guide (23) and the third flow guide (24) gradually becomes thinner from one end connected to the first flow guide (22) to the other end.

8. The range hood according to claim 7, characterized in that: The range hood further comprises a fan (5) and a fan cover (3), wherein the fan cover (3) is arranged on the top of the smoke collecting hood (1) and is connected to the side smoke collecting chamber (17), the fan (5) is located in the fan cover (3), the outlet of the fan (5) is arranged to deviate from the panel (11) and be perpendicular to the central axis N in the left and right directions, and the symmetrical axis of the first air guide (22) deviates from the central axis N on the side close to the outlet direction of the fan (5).

9. The range hood according to any one of claims 1 to 8, characterized in that: The range hood further comprises an oil guide plate (4) and an oil cup (6), wherein the oil cup (6) is arranged at the lower part of the smoke collecting hood (1), the oil guide plate (4) is located below the first flow guide member (22), one end of the oil guide plate (4) is connected to the panel (11), and the other end of the oil guide plate (4) is arranged to be gradually tilted downward from front to back; a smoke inlet hole (41) is provided on the oil guide plate (4).

10. The range hood according to any one of claims 1 to 8, characterized in that: The first flow guide (22) cooperates with the panel (11) to enclose and form a closed space; a sound-absorbing hole is provided on the first flow guide (22), and a sound-absorbing material is provided inside the first flow guide (22).

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