Range hood and volute assembly

Abstract

Disclosed are a range hood (100) and a volute assembly (102), relating to the technical field of range hoods. The range hood (100) comprises a housing (10), a fume gathering plate (20), and a flow guide structure (30); the housing (10) is provided with a fume inlet cavity (11), and is further provided with a fume inlet (12) in communication with the fume inlet cavity (11); the fume gathering plate (20) is rotatably mounted on the housing (10), and has a closed position for closing the fume inlet (12) and an open position for opening the fume inlet (12); and the flow guide structure (30) is fixedly arranged on the side of the fume gathering plate (20) facing the fume inlet (12), and is used for guiding oil fumes to the fume inlet (12).

Description

Range hood and volute assembly

[0001] Priority information

[0002] This application claims priority and benefits to patent applications filed with the China National Intellectual Property Administration on July 8, 2024, with patent application numbers 202410912624.4, 202410912567.X, 202410911494.2, and 202410911431.7, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of range hood technology, and in particular to a range hood and a volute assembly. Background Technology

[0004] When existing range hoods with smoke collection plates are in operation, because the smoke collection plates are open and there is a gap between them and the range hood body, a small amount of smoke leaks out through the gap during the process of the extracted smoke entering the range hood body, resulting in poor smoke extraction effect. Summary of the Invention

[0005] The main purpose of this application is to provide a range hood that aims to improve the smoke extraction effect of the range hood.

[0006] To achieve the above objectives, the range hood proposed in this application includes:

[0007] The housing has a smoke inlet chamber inside, and the housing also has a smoke inlet port that communicates with the smoke inlet chamber;

[0008] A smoke-collecting plate is rotatably mounted on the housing and has a closed position for closing the smoke inlet and an open position for opening the smoke inlet; and

[0009] A flow guiding structure is fixed on the side of the smoke collecting plate facing the smoke inlet, and the flow guiding structure is used to guide the oil fumes to the smoke inlet.

[0010] In one embodiment, the flow guiding structure includes a first flow guiding plate, the first flow guiding plate having a first flow guiding surface that is angled to the smoke gathering plate.

[0011] In one embodiment, the longitudinal profile of the first guide surface is a straight line or an arc.

[0012] In one embodiment, the extended surface of the first guide surface passes through the smoke inlet.

[0013] In one embodiment, the flow guiding structure further includes a second flow guiding plate, wherein the first flow guiding plate is fixedly connected to the smoke gathering plate via the second flow guiding plate, and the second flow guiding plate is at least partially attached to the smoke gathering plate.

[0014] In one embodiment, the second guide plate includes a first connecting section, a guide section, and a second connecting section connected in sequence. Both the first connecting section and the second connecting section are attached to the smoke collecting plate, and the guide section has a second guide surface protruding toward the smoke inlet.

[0015] In one embodiment, the first guide surface is located above the second guide surface;

[0016] In the direction close to the first guide surface, the distance between the second guide surface and the smoke gathering plate first increases and then decreases.

[0017] In one embodiment, the first guide plate is connected to the end of the second connecting section away from the guide section;

[0018] Alternatively, the first guide plate is connected between the second connecting section and the guide section.

[0019] In one embodiment, a support plate is fixed to the side of the first guide plate opposite to the first guide surface.

[0020] In one embodiment, the second connecting segment includes a first segment and a second segment connected together. The first segment is attached to the smoke-collecting plate, and the second segment is located on the side of the first guide plate opposite to the first guide surface and is connected to the first guide plate.

[0021] In one embodiment, the free end of the first guide plate abuts against the side of the first section opposite to the smoke-collecting plate.

[0022] In one embodiment, the first guide plate and the second guide plate are integrally formed.

[0023] In one embodiment, when the smoke-collecting plate is in the closed position, the flow-guiding structure is spaced apart from the edge of the smoke inlet.

[0024] In one embodiment, the edge of the smoke inlet is provided with a clearance groove for the flow guiding structure to extend into.

[0025] In the technical solution of this application, a flow guiding structure is set on the side of the smoke collecting plate facing the smoke inlet. When the range hood is working, the smoke collecting plate is in the open position. During the smoke extraction process, part of the oil fumes directly enter the smoke inlet cavity through the smoke inlet, while another part of the oil fumes rushes upward and to the flow guiding structure. Under the guidance of the flow guiding structure, the flow direction of this part of the oil fumes changes and flows towards the smoke inlet. This effectively improves the negative pressure distribution and oil fume flow state in front of the smoke inlet, making it easier for oil fumes to enter the smoke inlet cavity through the smoke inlet. This reliably reduces the amount of oil fume leakage at the gaps and improves the smoke extraction effect of the range hood.

[0026] This application also proposes a range hood that expands the suction range of the range hood by using a fan with dual air inlets; by setting a relief groove on the rear panel to increase the air duct of the rear air intake, reduce the air flow resistance at the fan air inlet, improve the smoke extraction effect and reduce the noise of the whole machine; in addition, the relief groove also increases the rigidity of the rear panel, thereby reducing the shaking and vibration noise of the whole machine.

[0027] To achieve the above objectives, the range hood proposed in this application includes:

[0028] The fan includes an air outlet and a first air inlet and a second air inlet located opposite each other on both sides of the fan; and

[0029] The chassis has a smoke inlet and a smoke outlet, the fan is located inside the chassis, the air outlet is connected to the smoke outlet, the chassis includes a rear panel opposite to the side of the smoke inlet, the fan is spaced apart from the rear panel, and the surface of the rear panel near the second air inlet is recessed in a direction away from the fan to form a clearance groove, and an air passage is formed between the surface of the fan and the groove wall of the clearance groove.

[0030] In one embodiment, in the left-right direction of the range hood, the width of the clearance groove is greater than or equal to the width of the fan.

[0031] In one embodiment, the bottom wall of the relief groove is parallel to the outer wall surface of the lower end of the fan near the second air inlet.

[0032] In one embodiment, the clearance groove includes a lower sidewall that extends beyond the bottom of the fan and slopes downward toward the fan.

[0033] In one embodiment, the clearance groove further includes an upper sidewall opposite to the lower sidewall, the end of the upper sidewall being inclined upward and parallel to the lower edge of the second air inlet.

[0034] In one embodiment, the depth of the clearance groove is less than or equal to 12 mm.

[0035] In one embodiment, the back panel is further provided with a reinforcing structure.

[0036] In one embodiment, the reinforcing structure is a plurality of reinforcing grooves formed by recesses in the rear back plate.

[0037] In one embodiment, the depth of the reinforcing groove is less than the depth of the relief groove.

[0038] In one embodiment, the plurality of reinforcing grooves include two first reinforcing grooves and two second reinforcing grooves, the two first reinforcing grooves being respectively disposed on both sides of the relief groove, and the two second reinforcing grooves being disposed below the relief groove and the second reinforcing grooves.

[0039] In one embodiment, both the reinforcing groove and the relief groove are provided with a flow guiding structure, which is used to guide the oil to the middle area of ​​the back plate.

[0040] In one embodiment, the flow guiding structure includes two adjacent groove walls of the first reinforcing groove, the two adjacent groove walls being close to the relief groove and inclined toward the lower sidewall of the relief groove.

[0041] In one embodiment, the flow guiding structure further includes a lower sidewall of the relief groove, the lower sidewall being inclined downward from both ends toward the middle in the width direction.

[0042] In one embodiment, the chassis includes an upper housing and a smoke hood located below and connected to the upper housing. The smoke exhaust port is located on the upper housing, and the rear panel is located on the smoke hood. The fan includes a volute, and the air outlet is located at the upper end of the volute. The first air inlet and the second air inlet are located on opposite sides of the volute.

[0043] The range hood also includes a support member, which is located on the back panel and below the clearance groove. The support member supports the lower end of the volute, part of which is located inside the upper housing and part of which is located inside the smoke collection hood.

[0044] In one embodiment, the back panel is further provided with a mounting protrusion, two second reinforcing grooves are located on both sides of the mounting protrusion, and the support member is provided on the mounting protrusion.

[0045] The technical solution of this application firstly reduces airflow resistance and improves airflow efficiency through the recessed design, resulting in smoother airflow and thus enhanced smoke extraction while reducing overall noise. Secondly, the recessed design avoids creating cleaning dead zones, making cleaning and maintenance of the range hood easier. Furthermore, the recessed wall, under the influence of airflow at the smoke inlet, guides the condensed oil to the central area of ​​the back panel, reducing the amount of condensed oil residue on the back panel surface and facilitating user cleaning. Additionally, the recessed design on the back panel increases its structural strength, reducing overall vibration and noise, and allows for more efficient use of internal space, potentially providing more room for the fan or other components, thus optimizing the overall design.

[0046] This application also proposes a volute assembly and a range hood, which aims to meet safety requirements while allowing smoke to enter the fan system more evenly, improving the working efficiency of the fan impeller, reducing the noise of the whole machine, and preventing condensed oil and condensate (generated by steam cleaning) inside the fan system from flowing out from the gaps and dripping from the air duct of the casing onto the stove outside the range hood.

[0047] To achieve the above objectives, the volute assembly proposed in this application includes:

[0048] The volute body has an air inlet; and

[0049] An air inlet screen includes a mounting ring and an air inlet screen body disposed on the mounting ring. The air inlet screen body has a mesh structure. The mounting ring abuts against the edge of the air inlet and the mounting ring also has a baffle near the edge of the air inlet.

[0050] In one embodiment, the edge of the air inlet is folded inward to form a skirt, and the air deflector is close to the skirt.

[0051] In one embodiment, the flow deflector has an inner side surface near the mesh structure and an outer side surface opposite to the inner side surface, the inner side surface being inclined toward the outer side surface in the extending direction of the flow deflector.

[0052] In one embodiment, the angle between the inner side of the deflector and the extending direction is in the range of 5°-30°.

[0053] In one embodiment, the extension length of the flow deflector is greater than the length of the skirt, and the length of the flow deflector is h, where 3mm ≤ h ≤ 9mm.

[0054] In one embodiment, the volute assembly further includes a fan wheel disposed within the volute body, and the distance from the outer surface of the edge of the air inlet to the outer surface of the fan wheel is L, where h and L satisfy 0.35≤h / L≤0.55.

[0055] In one embodiment, the mounting ring is further provided with an arc-shaped air guide structure extending into the air inlet.

[0056] In one embodiment, the mesh structure includes at least one mesh region, wherein the aperture of the mesh in the mesh region gradually increases from the center of the mesh region outward.

[0057] In one embodiment, the wind network body includes a plurality of main radial strips distributed radially outward from the center of the wind network body; and

[0058] Multiple annular components with gradually increasing radii centered on the center, each annular component being connected to multiple main radiating strips, and the free ends of the multiple main radiating strips being connected to the mounting ring respectively.

[0059] This application also proposes a range hood, comprising:

[0060] The chassis has an air duct, and a smoke inlet and a smoke outlet communicating with the air duct;

[0061] As described above, the volute assembly is disposed within the air duct and has an air inlet communicating with the air duct and an air outlet communicating with the smoke exhaust outlet; and

[0062] The fan assembly is located inside the volute assembly.

[0063] The technical solution of this application applies an air inlet mesh to the air inlet of the range hood's volute body. First, it enables the range hood to meet safety regulations, ensuring the safe use of the fan and preventing fingers or other parts from being inhaled into the fan. Second, the mesh structure can reduce the eddy currents at the fan inlet, allowing the smoke to enter the fan system more evenly, improving the working efficiency of the fan impeller and reducing the overall noise. Third, the mounting ring is installed on the edge of the air inlet, and the mounting ring has a baffle that abuts against the edge of the air inlet. The baffle blocks the gap between the mounting ring and the air inlet, preventing condensed oil and condensate (generated by steam cleaning) inside the fan system from flowing out of the gap and dripping from the air duct of the casing onto the stove outside the range hood.

[0064] This application also proposes a range hood designed to enhance the functionality of the rectifier.

[0065] To achieve the above objectives, the range hood proposed in this application includes:

[0066] The housing has a smoke inlet, a smoke outlet, and a smoke passage cavity connecting the smoke inlet and the smoke outlet;

[0067] A centrifugal fan, comprising a volute housing disposed in the smoke passage chamber and having an oil leakage hole at the bottom; and

[0068] A rectifier is located below the volute. At least two smoke inlets are provided. The rectifier is correspondingly disposed at the interval between two adjacent smoke inlets to divide the smoke passage into at least two smoke inlet channels.

[0069] The rectifier has an oil inlet, an oil outlet, and an oil guide channel connecting the oil inlet and the oil outlet. The oil inlet is located at the upper end of the rectifier, corresponding to the oil leakage hole.

[0070] In one embodiment, the top surface of the rectifier extends downward at an angle close to the side where the oil inlet is located, the rear side of the top surface of the rectifier protrudes from the lower side of the rear end face of the volute, and / or, the front side of the top surface of the rectifier protrudes from the lower side of the front end face of the volute.

[0071] In one embodiment, the bottom wall of the volute extends downward at an angle from back to front, the oil leakage hole is located at the front end of the bottom wall of the volute, and the oil inlet is located at the front end of the top surface of the rectifier.

[0072] In one embodiment, the front edge of the oil inlet protrudes from the lower side of the front end face of the volute.

[0073] In one embodiment, the top surface of the rectifier is adapted to abut against the bottom surface of the volute.

[0074] In one embodiment, the bottom wall of the rectifier extends downward at an angle from front to back, and the oil outlet is located at the lower end of the bottom wall of the rectifier.

[0075] In one embodiment, the rectifier is provided with a noise reduction structure and a sound inlet communicating with the noise reduction structure, and the sound inlet is provided corresponding to the oil leakage hole.

[0076] In one embodiment, the silencing structure includes a plurality of silencing cavities, at least one of the silencing cavities is connected to the sound inlet, and the rectifier is further provided with a sound passage hole connecting two adjacent silencing cavities.

[0077] In one embodiment, the sound inlet and the oil inlet are configured with the same structure, and the oil guide channel is connected to the sound-absorbing cavity.

[0078] In one embodiment, the rectifier includes a cover and a partition disposed in the middle of the cover. The cover opening of the cover is arranged facing rearward. The partition and the cover together enclose a plurality of sound-absorbing cavities. The sound passage is disposed on the partition.

[0079] In one embodiment, the rectifier has rectifying sides on opposite sides of the arrangement direction of the smoke inlet, and the distance between the two rectifying sides gradually increases from bottom to top.

[0080] In one embodiment, the spacing between the two rectifier sides is gradually increased in the direction from front to back.

[0081] The technical solution of this application, by setting an oil inlet, an oil outlet and an oil guide channel on the rectifier, enables the rectifier to not only divide the smoke chamber into multiple smoke inlet channels, but also to function as an oil nozzle, thereby enriching the functions of the rectifier and saving the original oil nozzle parts, which is conducive to simplifying the structure and reducing the manufacturing cost of the range hood. Attached Figure Description

[0082] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0083] Figure 1 is a structural schematic diagram of an embodiment of the range hood provided in this application; at this time, the smoke collection plate is in the open position;

[0084] Figure 2 is a side sectional view of the range hood in Figure 1;

[0085] Figure 3 is a magnified view of part A in Figure 2;

[0086] Figure 4 is a structural schematic diagram of an embodiment of the range hood provided in this application; at this time, the smoke collection plate is in the closed position;

[0087] Figure 5 is a side sectional view of the range hood in Figure 4;

[0088] Figure 6 is a magnified view of part B in Figure 5;

[0089] Figure 7 is a structural schematic diagram of another embodiment of the range hood provided in this application; at this time, the smoke collection plate is in the open position;

[0090] Figure 8 is a side sectional view of the range hood in Figure 7;

[0091] Figure 9 is a magnified view of part C in Figure 8;

[0092] Figure 10 is a structural schematic diagram of another embodiment of the range hood provided in this application; at this time, the smoke collection plate is in the closed position;

[0093] Figure 11 is a side sectional view of the range hood in Figure 10;

[0094] Figure 12 is a magnified view of part D in Figure 11;

[0095] Figure 13 is a schematic diagram of the force analysis of oil fume particles when the range hood is working.

[0096] Explanation of the numbers in Figures 1 to 13: 100, Range hood; 101, Gap; 10, Housing; 11, Smoke inlet chamber; 12, Smoke inlet; 13, Clearance groove; 20, Smoke gathering plate; 30, Airflow guiding structure; 31, First airflow guide plate; 311, First airflow guiding surface; 32, Second airflow guide plate; 321, First connecting section; 322, Airflow guiding section; 323, Second connecting section; 324, Second airflow guiding surface; 40, Glass panel.

[0097] Figure 14 is a structural schematic diagram of an embodiment of the range hood provided in this application;

[0098] Figure 15 is a structural schematic diagram of the exposed back plate and volute portion in Figure 14;

[0099] Figure 16 is a schematic diagram of the cross-sectional structure of the side of the range hood in Figure 14;

[0100] Figure 17 is a structural schematic diagram of one embodiment of the rear panel in Figure 14.

[0101] Explanation of the reference numerals in Figures 14 to 17: 100, Range hood; 101, Air passage; 200, Chassis; 201, Smoke inlet; 202, Smoke outlet; 210, Back panel; 220, Recessed groove; 221, Upper side wall; 222, Bottom wall of the groove; 223, Lower side wall; 230, Mounting protrusion; 240, Reinforcing structure; 241, Reinforcing groove; 242, First reinforcing groove; 243, Second reinforcing groove; 250, Air guide structure; 203, Upper housing; 204, Smoke hood; 300, Fan; 310, Volute; 311a, Air outlet; 312, First air inlet; 313, Second air inlet; 400, Support component; 401, Upper surface; 410, Oil cavity; 420, Oil port.

[0102] Figure 18 is a structural schematic diagram of an embodiment of the volute assembly provided in this application;

[0103] Figure 19 is a magnified view of part A in Figure 18;

[0104] Figure 20 is a structural schematic diagram of an embodiment of the air inlet mesh in Figure 18;

[0105] Figure 21 is a cross-sectional view of the air inlet mesh from another perspective;

[0106] Figure 22 is a structural schematic diagram of the air intake mesh from another perspective.

[0107] Explanation of the reference numerals in Figures 18 to 22: 102, volute assembly; 110, volute body; 111, air inlet; 112, skirt; 120, air inlet mesh; 130, air mesh body; 131, mesh structure; 132, main radiating strip; 133, annular component; 134, clearance opening; 140, mounting ring; 150, baffle; 151, inner side; 152, outer side; 160, arc-shaped air guide structure; 170, impeller.

[0108] Figure 23 is a structural schematic diagram of an embodiment of the range hood provided in this application;

[0109] Figure 24 is a schematic diagram of the internal structure of the embodiment shown in Figure 23;

[0110] Figure 25 is a schematic diagram of the rectifier in Figure 24;

[0111] Figure 26 is a partial cross-sectional view of the embodiment shown in Figure 23;

[0112] Figure 27 is a cross-sectional view at point AA in Figure 26;

[0113] Figure 28 is a partial view of the structure shown in Figure 27 at the bottom;

[0114] Figure 29 is a left-side view of the rectifier shown in Figure 25;

[0115] Figure 30 is a cross-sectional view at point BB in Figure 29;

[0116] Figure 31 is a cross-sectional view at CC in Figure 29;

[0117] Figure 32 is a cross-sectional view of section DD in Figure 30.

[0118] Explanation of the numbers in Figures 23 to 32: 10. Housing; 11a. Smoke inlet; 12a. Smoke outlet; 13a. Smoke passage chamber; 14. Rectifier; 20a. Cover; 20b. Partition; 20c. First plate; 20d. Second plate; 20e. Rectifier side; 21. Oil inlet; 22. Oil outlet; 23. Oil guide channel; 24. Silencing chamber; 25. Sound passage hole; 26. Oil passage hole; 271. Snap-fit ​​part; 272. Mounting lug; 30. Centrifugal fan; 31. Volute; 311b. Oil leakage hole; 312a. Main air inlet; 313a. Secondary air inlet; 314. Air outlet; 315. Main smoke inlet channel; 316. Secondary smoke inlet channel; 90. Stove.

[0119] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0120] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0121] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0122] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0123] When existing range hoods with smoke collection plates are in operation, because the smoke collection plates are open and there is a gap between them and the range hood body, a small amount of smoke leaks out through the gap during the process of the extracted smoke entering the range hood body, resulting in poor smoke extraction effect.

[0124] To solve this technical problem, this application proposes a range hood 100.

[0125] Please refer to Figures 1 to 13. In one embodiment of this application, the range hood 100 includes a housing 10, a smoke-gathering plate 20, and a flow-guiding structure 30. The housing 10 has a smoke inlet chamber 11 and a smoke inlet 12 communicating with the smoke inlet chamber 11. The smoke-gathering plate 20 is rotatably mounted on the housing 10 and has a closed position with the smoke inlet 12 closed and an open position with the smoke inlet 12 open. The flow-guiding structure 30 is fixed to the side of the smoke-gathering plate 20 facing the smoke inlet 12 and is used to guide the fumes to the smoke inlet 12, thereby improving the smoke extraction effect of the range hood 100.

[0126] In the technical solution of this application, by setting a guide structure 30 on the side of the smoke collecting plate 20 facing the smoke inlet 12, when the range hood 100 is working, the smoke collecting plate 20 is in the open position. During the smoke extraction process, part of the oil fumes directly enter the smoke inlet chamber 11 through the smoke inlet 12, and another part of the oil fumes rush upward and rush to the guide structure 30. Under the guidance of the guide structure 30, the flow direction of this part of the oil fumes changes and flows towards the smoke inlet 12. In this way, the negative pressure distribution and oil fume flow state in front of the smoke inlet 12 are effectively improved, making it easier for oil fumes to enter the smoke inlet chamber 11 through the smoke inlet 12. This reliably reduces the amount of oil fume leakage at the gap 101 and improves the smoke extraction effect of the range hood 100.

[0127] Specifically, the range hood 100 includes a housing 10, which has a smoke inlet 12 for the entry of cooking fumes absorbed by the range hood 100 during operation. A smoke gathering plate 20 is provided to cover the smoke inlet 12, which not only improves the appearance of the range hood 100, but also reduces the risk of foreign objects entering the smoke inlet chamber 11 through the smoke inlet 12 when the range hood is off. The smoke gathering plate 20 is rotatably connected to the housing 10, so that the smoke gathering plate 20 can flexibly switch between open and closed positions to adapt to the specific operating conditions of the range hood 100.

[0128] To ensure smooth opening and closing of the smoke-collecting plate 20, a movable gap 101 is always provided between the smoke-collecting plate 20 and the housing 10 to reduce the possibility of interference between them. Thus, when the smoke-collecting plate 20 is in the open position, a gap 101 remains between the end of the smoke-collecting plate 20 near the housing 10 and the glass panel 40 on the surface of the housing 10. When the range hood 100 starts working, some of the fumes directly enter the smoke inlet chamber 11 through the smoke inlet 12, while the rest, due to their upward initial velocity, easily rushes upward along the smoke-collecting plate 20 and overflows through the gap 101. Therefore... A flow guiding structure 30 is provided on the back of the smoke collecting plate 20, and the flow guiding structure 30 is used to guide the oil fumes to the smoke inlet 12. When the oil fumes rush to the flow guiding structure 30, the flow guiding structure 30 will give the oil fumes a downward component velocity, causing the negative pressure to shift downward. At this time, as shown in Figure 13, the direction of the oil fumes is the direction of the resultant velocity to the right, specifically towards the smoke inlet 12. Therefore, by improving the negative pressure distribution and oil fume flow state in front of the smoke inlet 12, it helps the oil fumes flow towards the smoke inlet 12, thereby reducing the amount of oil fume leakage at the gap 101 and improving the smoke extraction effect of the range hood 100.

[0129] Please refer to Figures 3 and 9. In the embodiments of this application, the flow guiding structure 30 includes a first flow guiding plate 31. The first flow guiding plate 31 has a first flow guiding surface 311 that is set at an angle to the smoke gathering plate 20. Thus, because there is an angle between the first flow guiding surface 311 and the smoke gathering plate 20, the first flow guiding surface 311 tends to extend toward the range hood 100. Furthermore, by setting the first flow guiding surface 311, the flow direction of the oil fumes rushing up along the smoke gathering plate 20 is changed, so that the oil fumes are closer to the smoke inlet 12 for diffusion, which facilitates the flow of oil fumes into the smoke inlet 12 and reduces the risk of oil fumes overflowing from the gap 101.

[0130] Specifically, in the embodiments of this application, the longitudinal section outline of the first guide surface 311 is a straight line or an arc. The longitudinal section is specifically the section in the vertical direction shown in Figures 2 and 8. When the longitudinal section outline of the first guide surface 311 is a straight line, in order to ensure the guiding effect of the first guide surface 311, the end of the outline of the first guide surface 311 away from the smoke collecting plate 20 extends towards the smoke inlet 12. At this time, the first guide surface 311 is inclined downwards as a whole. When the longitudinal section of the first guide surface 311... When the outline is an arc, the first guide surface 311 has two configurations: First, the longitudinal section outline of the first guide surface 311 protrudes towards the upper edge of the smoke collecting plate 20, and its end away from the smoke collecting plate 20 extends towards the smoke inlet 12; Second, the longitudinal section outline of the first guide surface 311 protrudes towards the surface away from the smoke collecting plate 20 and towards the smoke inlet 12. In this case, the first guide surface 311 can be configured as the second guide surface 324 described below, both of which can achieve the change of the direction of oil fume flow by the guide structure 30. However, this design is not limited to this. In other embodiments, the longitudinal section outline of the first guide surface 311 is a multi-segment line, which includes, but is not limited to, straight segments and arc segments.

[0131] When one end of the first guide plate 31 is connected to the smoke-gathering plate 20 and the other end extends toward the smoke inlet 12, optionally, in the embodiments of this application, the extended surface of the first guide surface 311 passes through the smoke inlet 12. It can be understood that by setting the extended surface of the first guide surface to pass through the smoke inlet 12, the intersection of the extended surface and the plane where the smoke inlet 12 is located is between the upper and lower edges of the smoke inlet 12. This can, to a certain extent, concentrate the fumes through the smoke inlet 12, reducing the possibility of fumes impacting the surrounding structures of the smoke inlet 12, helping to reduce noise, and simultaneously improving the smoke extraction effect of the range hood 100. However, this design is not limited to this. In other embodiments, the extended surface of the first guide surface 311 is positioned close to the upper edge of the smoke inlet 12.

[0132] Please refer to Figures 3 and 9. In the embodiments of this application, the flow guiding structure 30 further includes a second flow guiding plate 32. The first flow guiding plate 31 is fixedly connected to the smoke collecting plate 20 through the second flow guiding plate 32. The second flow guiding plate 32 is at least partially attached to the smoke collecting plate 20. It can be understood that the second flow guiding plate 32 serves as a connecting structure for the first flow guiding plate 31 to connect to the smoke collecting plate 20. It is fixedly connected to the smoke collecting plate 20 by means of, for example, bonding, snap-fitting, screw connection, etc., so that the first flow guiding plate 31 is installed on the smoke collecting plate 20. As shown in Figure 3, the second flow guiding plate 32 is partially attached to the smoke collecting plate 20, or as shown in Figure 9, the second flow guiding plate 32 is completely attached to the smoke collecting plate 20. There is a large effective contact area between the second flow guiding plate 32 and the smoke collecting plate 20, which can effectively prevent oil fumes from flowing through the gap between the second flow guiding plate 32 and the smoke collecting plate 20. It can also enhance the structural strength of both the flow guiding structure 30 and the smoke collecting plate 20 to a certain extent.

[0133] Please refer to Figures 3 and 6. In the embodiments of this application, the second guide plate 32 includes a first connecting section 321, a guide section 322, and a second connecting section 323 connected in sequence. The first connecting section 321 and the second connecting section 323 are both attached to the smoke collecting plate 20. The guide section 322 has a second guide surface 324 protruding towards the smoke inlet 12, so that the second guide plate 32 can change the direction of the oil fume flow. As a result, the direction of the oil fume changes from the upward direction to the direction of the combined velocity to the right, specifically towards the smoke inlet 12. This effectively improves the negative pressure distribution and oil fume flow state in front of the smoke inlet 12, and improves the smoke extraction effect of the range hood 100.

[0134] Specifically, the close fit between the first connecting section 321 and the second connecting section 323 and the smoke gathering plate 20 can not only improve the connection strength between the second guide plate 32 and the smoke gathering plate 20, but also reduce the risk of poor overall flow guidance effect caused by the gap between the smoke gathering plate 20 and the second guide plate 32 when the oil fumes rise. The guide section 322 has a second guide surface 324 protruding towards the smoke inlet 12. The second guide surface 324 is specifically set on the side of the guide section 322 facing the smoke inlet 12, and the longitudinal section outline of the second guide surface 324 includes at least an arc. Therefore, when the oil fumes rise along the second guide plate 32, the oil fumes are subjected to force on the second guide surface 324 and generate a resultant velocity in the direction of the oil fumes to the right. That is, the second guide surface 324 can change the direction of the oil fumes.

[0135] The second guide plate 32 is set with a uniform thickness, which facilitates the processing and manufacturing of the second guide plate 32. At this time, the guide section 322 is arched towards the smoke inlet 12, so that an installation gap is formed between the guide section 322 and the smoke gathering plate 20. This installation gap can also assist the deformation of the guide section 322 to a certain extent, improve the service life and guide reliability of the guide section 322; or, the surface of the guide section 322 facing the smoke gathering plate 20 is connected to the smoke gathering plate 20, further enhancing the connection strength between the second guide plate 32 and the smoke gathering plate 20.

[0136] Please refer to Figures 2 and 3. In the embodiments of this application, the first guide surface 311 is located above the second guide surface 324. With this configuration, the second guide surface 324 changes the direction of the fumes by protruding towards the smoke inlet 12, while the fumes that do not change direction continue to rise. At this time, the first guide surface 311 serves as the rear end structure of the second guide surface 324. Because the first guide surface 311 has a tendency to extend towards the range hood 100, the rising fumes collide with the first guide surface 311. Under the action of the first guide surface 311, the upward trend is further changed to a rightward movement trend, making the fumes closer to the smoke inlet 12 for diffusion, facilitating the flow of fumes into the smoke inlet 12, and reducing the risk of fumes overflowing from the gap 101.

[0137] In this design, the distance between the second guide surface 324 and the smoke-gathering plate 20 first increases and then decreases in the direction close to the first guide surface 311. Specifically, the longitudinal profile of the second guide surface 324 may include a straight segment gradually approaching the smoke inlet 12 from bottom to top, and an arc segment connecting the straight segment at one end and the smoke-gathering plate 20 (or the first guide plate 31) at the other end. This gradual change from the straight segment to the arc segment alters the flow direction of the fumes, reducing the risk of turbulence and noise, while simultaneously increasing the amount of fumes entering the smoke inlet 12 and improving the smoke extraction effect of the range hood 100. However, this design is not limited to this; in other embodiments, the second guide plate 32 only includes a first connecting section 321 and a second connecting section 323.

[0138] Optionally, in an embodiment of this application, the first guide plate 31 is connected to the end of the second connecting section 323 away from the guide section 322. In this case, the first guide plate 31 and the second connecting section 323 form a ∧ structure as shown in Figure 3. The inner surface of the first guide plate 31 is the first guide surface 311, which can block the upward rushing fumes and change their flow direction, causing the fumes to diffuse towards the smoke inlet 12 and enter the smoke inlet chamber 11 from the smoke inlet 12. The second connecting section 323 can act as a fume buffer section, guiding the fumes upward towards the tip and close to the first guide surface 311. While ensuring the guiding effect of the first guide surface 311, the included angle between the first guide plate 31 and the second connecting section 323 is not limited. However, this design is not limited to this. In other embodiments, as shown in FIG3, the second guide plate 32 connected to the first guide plate 31 has a second guide surface 324 protruding toward the smoke inlet 12; or, the second guide plate 32 connected to the first guide plate 31 does not have a second guide surface 324 protruding toward the smoke inlet 12, that is, the second guide plate 32 only includes the first connecting section 321 and the second connecting section 323.

[0139] In addition, a support plate can be fixed to the side of the first guide plate 31 away from the first guide surface 311. At this time, one end of the support plate is connected to the first guide plate 31 and the other end is connected to the smoke collection plate 20, which helps to enhance the installation stability of the first guide plate 31.

[0140] Optionally, in an embodiment of this application, the first guide plate 31 is connected between the second connecting section 323 and the guide section 322, so that a support plate is provided between the side of the first guide plate 31 away from the first guide surface 311 and the second connecting section 323 to enhance the installation stability of the first guide plate 31. One end of the support plate is connected to the second connecting section 323, and the other end is connected to the end of the first guide plate 31 away from the smoke collecting plate 20, or connected to the middle of the first guide plate 31. However, this design is not limited to this. In other embodiments, the first guide plate 31 is disposed on the second connecting section 323, and the second guide plate 32 connected to the first guide plate 31 has a second guide surface 324 protruding toward the smoke inlet 12; or, as shown in FIG12, the second guide plate 32 connected to the first guide plate 31 does not have a second guide surface 324 protruding toward the smoke inlet 12.

[0141] Please refer to Figures 9 and 12. In the embodiments of this application, the second connecting segment 323 includes a first segment and a second segment connected together. The first segment is attached to the smoke-collecting plate 20, and the second segment is located on the side of the first guide plate 31 away from the first guide surface 311 and is connected to the first guide plate 31. It can be understood that the first segment is used as the connecting structure of the second connecting segment 323 to connect the smoke-collecting plate 20. It is tightly attached to the smoke-collecting plate 20 by means of bonding, snap-fitting, screw connection, etc., to ensure that there is a large effective contact area between the first segment and the smoke-collecting plate 20, thereby improving the connection strength between the second connecting segment 323 and the smoke-collecting plate 20.

[0142] The second section connects to the first section at one end and to the first guide plate 31 at the other end, achieving the integrity of the second connecting section 323 (or the second guide plate 32) and the first guide plate 31. This facilitates the assembly of the guide structure 30 on the smoke collection plate 20 and also helps to disperse the impact of oil fumes through the connection between the first guide plate 31 and the second connecting section 323. The second section is located on the side of the first guide plate 31 away from the first guide surface 311. Without affecting the guide of oil fumes by the first guide surface 311, it can further improve the structural stability of the first guide plate 31, reduce the risk of the first guide plate 31 deforming due to impact and causing incorrect guide direction, and ensure the reliable smoke extraction of the range hood 100.

[0143] Furthermore, in the embodiments of this application, the free end of the first guide plate 31 abuts against the side of the first section away from the smoke-gathering plate 20. With this configuration, when the longitudinal section outline of the first guide plate 31 is a straight line, the first section, the second section, and the first guide plate 31 enclose a triangular structure. This not only improves the overall stability of the guide structure 30, but also reduces the possibility of oil fumes flowing into the triangular structure from the gap 101 between the free end of the first guide plate 31 and the first section, and flowing out from the opening ends on both sides of the triangular structure. This increases the amount of oil fumes guided by the first guide surface 311, thereby improving the smoke extraction effect of the range hood 100.

[0144] Optionally, in the embodiments of this application, the first guide plate 31 and the second guide plate 32 are integrally formed, which facilitates the forming and processing of the guide structure 30, helps to ensure the overall structural strength of the guide structure 30, and also helps to improve the assembly convenience of the guide structure 30.

[0145] Please refer to Figures 6 and 12. In the embodiments of this application, when the smoke gathering plate 20 is in the closed position, the flow guiding structure 30 and the edge of the smoke inlet 12 are spaced apart to reduce the risk of interference between the flow guiding structure 30 and the housing 10 when the smoke gathering plate 20 is closed. This ensures the reliable closing of the smoke gathering plate 20 and effectively avoids the flow guiding structure 30 from being affected by collision with the housing 10, thereby improving the reliability and smoke extraction effect of the range hood 100.

[0146] Please refer to Figures 6 and 12. In the embodiments of this application, the edge of the smoke inlet 12 is provided with a relief groove 13 for the guide structure 30 to extend into. Thus, when the smoke gathering plate 20 is in the closed position, the first guide plate 31 of the guide structure 30 extends into the relief groove 13, and the smoke gathering plate 20 is as close as possible to the surface of the housing 10, which helps to achieve the miniaturization of the range hood 100. Furthermore, in conjunction with the spacing between the guide structure 30 and the edge of the smoke inlet 12, the end of the first guide plate 31 away from the smoke gathering plate 20 is spaced apart from the bottom wall of the relief groove 13, which plays a role in protecting the guide structure 30, thereby improving the guide reliability of the guide structure 30 and improving the smoke extraction effect of the range hood 100. At the same time, when the smoke gathering plate 20 is in the open position, the groove wall of the relief groove 13 can guide the oil fumes near the smoke inlet 12 to a certain extent, accelerate the efficiency of oil fumes entering the smoke inlet 12, and reduce the generation of noise.

[0147] Furthermore, taking Figure 2 as an example, the direction perpendicular to the paper is the horizontal direction. The horizontal width of the flow guiding structure 30 is smaller than the slot width of the avoidance groove 13, which reduces the risk of interference between the flow guiding structure 30 and the housing 10.

[0148] In addition, range hoods are widely used kitchen appliances. Taking side-mounted range hoods as an example, they absorb cooking fumes and odors by drawing air in from the side, thus purifying the kitchen air. They are usually installed to the side of the stove for more effective fume capture. Currently, side-mounted range hoods have issues with high air resistance and relatively high noise levels.

[0149] In traditional range hood designs, the back panel is usually directly connected to the fan surface, which to some extent restricts the efficiency of airflow and creates a dead corner that is difficult to clean between the fan and the back panel. In addition, it can also cause the back panel to shake and vibrate.

[0150] Therefore, referring to Figures 14 to 17, this application proposes a range hood 100.

[0151] Please refer to Figure 14. In one embodiment of this application, the range hood 100 includes a casing 200 and a fan 300 arranged in the cavity of the casing 200. The fan 300 includes an air outlet 311a and a first air inlet 312 and a second air inlet 313 disposed opposite to each other on both sides of the fan 300. The casing 200 also has a smoke inlet 201 and a smoke outlet 202 communicating with the cavity. The air outlet 311a is connected to the smoke outlet 202. The casing 200 has a rear panel 210 opposite to the side of the smoke inlet 201. The surface of the rear panel 210 near the second air inlet 313 is recessed in a direction away from the fan 300 to form a relief groove 220. The surface of the fan 300 and the groove wall of the relief groove 220 form an air passage 101 communicating with the cavity. The second air inlet 313 is connected to the air passage 101.

[0152] Compared to the traditional range hood 100 design, where the back panel 210 is usually directly connected to the surface of the fan 300, this can restrict the efficiency of airflow to some extent, or create a hard-to-clean dead corner between the fan 300 and the back panel 210, and cause the back panel 210 to vibrate and make noise.

[0153] The technical solution of this application firstly reduces airflow resistance and improves airflow efficiency through the design of the clearance groove 220, making airflow smoother and thus improving the smoke extraction effect. Secondly, under the action of the air inlet 201, the groove wall of the clearance groove 220 can guide the oil flow of the back panel 210, directing the condensed oil to the middle area, reducing the amount of condensed oil marks on the surface of the back panel 210, and making it easier for users to clean. Finally, by forming a groove on the back panel 210, the structural strength of the back panel 210 can also be improved, and to a certain extent, the internal space of the chassis 200 can be utilized more effectively, potentially providing more space for the fan 300 or other components, thus optimizing the overall design.

[0154] Referring to Figure 15, where arrows indicate airflow direction (large arrows indicate the first air inlet, small arrows indicate the second air inlet), this solution, using a fan with two air inlets (300), expands the suction range compared to traditional single-inlet range hoods. This allows the range hood to absorb cooking fumes more quickly and comprehensively. This is especially useful in kitchens with large cooking areas or multiple stoves, where a single air inlet may not be sufficient to effectively absorb fumes. For kitchens with varying layouts or widely distributed stoves, dual air inlets offer a more flexible fume extraction solution.

[0155] The range hood 100 is either a side range hood or a small side range hood. The main difference between them is whether the fan 300 occupies the entire space of the casing 200. That is, the small side range hood 100 is suitable for small apartments or families with limited kitchen space, while the standard side range hood 100 is suitable for families with higher requirements for smoke extraction or larger kitchen space.

[0156] Regardless of its form, the side-mounted range hood 100 is primarily used to absorb fumes and odors generated during cooking, keeping the kitchen air fresh. It is typically installed to the side of the stove for more effective fume capture. The side-mounted range hood 100 consists of a housing 200, a fan 300, a filter, lighting, a control panel, and mounting brackets. The housing 200 is the external structure of the side-mounted range hood 100, usually made of stainless steel or other metal, known for its durability and ease of cleaning. The mounting brackets are used to secure the range hood to a wall or cabinet. The housing 200 has a smoke inlet 201, at which a filter / grease filter is located to capture grease and large particles from the fumes, preventing them from entering the interior. The lighting provides additional light during cooking. The control panel is used to operate the range hood's on / off function, adjust the fan speed, and control the lighting. The exhaust duct connects the housing 200's exhaust outlet 202 to the outside, venting the extracted fumes outdoors or into a shared flue. The oil cup / oil box collects the filtered grease and needs to be cleaned regularly. It may include additional components such as air deflectors and sound insulation materials to improve the performance and user experience of the range hood.

[0157] Referring to Figure 16, the surface of the fan 300 and the groove wall of the relief groove 220 form an air passage 101 that connects to the receiving cavity. That is, the side of the fan 300 facing the rear panel 210 is spaced apart from the rear panel 210. The fan 300 generates a strong suction, which draws in the oil fumes and steam generated during cooking from the smoke inlet 201 and divides them into two parts from the bottom of the fan 300. One part enters the fan 300 from the first air inlet 312, and the other part enters the second air inlet 313 through the air passage 101. Finally, it is discharged from the air outlet 311a through the smoke exhaust outlet 202.

[0158] Referring to Figures 15 and 16, the negative pressure generated by the fan 300 at the second air inlet 313 draws smoke from both sides of the volute 310. To improve the air intake effect, the width of the clearance groove 220 in the left-right direction of the range hood 100 is greater than or equal to the width of the fan 300. The clearance groove 220 extends along the width direction of the fan 300, and its extension length is not less than the width of the fan 300. This extension length ensures a wider airflow path, thereby improving airflow efficiency and increasing smoke extraction. The clearance groove 220 forms part of the air duct; a wider air duct guides air more smoothly through the fan 300, reducing airflow resistance, turbulence, and eddies during airflow, thus reducing noise and improving the user experience. In addition, the wider groove can enhance the structural stability between the back panel 210 and the fan 300 to a certain extent, and reduce structural deformation caused by vibration or wind.

[0159] Flue gas or steam enters the air passage 101 through the lower end of the fan 300 and the surface of the back panel 210. If the distance between the lower end and the back panel 210 is too small, it will increase turbulence and noise.

[0160] Referring to FIG16, in this embodiment, in order to improve the air intake effect and reduce noise, the clearance groove 220 includes a lower sidewall 223, the lower sidewall 223 extends beyond the bottom of the fan 300, and the lower sidewall 223 is inclined downward toward the fan 300.

[0161] The lower sidewall 223 extends beyond the bottom of the fan 300 and is designed to slope downwards, changing the inlet of the air passage 101 from facing the bottom of the casing 200 to facing the smoke inlet 201 of the casing 200. This also enlarges the inlet of the air passage 101. Combined with the sloped lower sidewall 223, this helps reduce turbulence generated during airflow, thereby reducing noise and providing a quieter cooking environment. Furthermore, the sloped lower sidewall 223 also helps guide the fumes smoothly into the fan 300 along the sloped surface, optimizing the airflow path and improving smoke extraction efficiency.

[0162] Referring to FIG16, in this embodiment, in order for the flue gas to pass more smoothly through the air passage 101 into the second air inlet, the clearance groove 220 includes an upper sidewall 221 opposite to the lower sidewall 223. The end of the upper sidewall 221 is inclined upward and parallel to the edge of the second air inlet.

[0163] A circular second air inlet, connecting the interior, is formed in the middle of the volute 310. The edge of the second air inlet has a rounded transition, and the end of the upper sidewall 221 slopes upward, so that the projections of the upper sidewall 221 and the edge of the second air inlet on the vertical section are parallel. In this way, the flue gas passing through the air passage 101 can be guided into the second air inlet. The outlet of the parallel air passage 101 has a better smoke extraction effect compared to a narrow opening; compared to a wide opening, it avoids the diffusion of flue gas and concentrates it into the second air inlet, reducing turbulence and eddies generated during airflow, thereby reducing noise. The inclined design of the upper sidewall 221 and the lower sidewall 223 can expand the smoke extraction range, making it easier to draw in the fumes rising from the stove.

[0164] In addition, from the outside of the back panel 210, the sloping design of the upper sidewall 221 and the lower sidewall 223 can serve as a visual element of the back panel 210, increasing the design sense and aesthetics of the product.

[0165] It should be noted that the edge of the second air inlet refers to the outer boundary or outline of the second air inlet 313 at the bottom of the fan 300. The edge is the dividing line between the second air inlet 313 and other parts of the range hood. In the case of a smooth or sloping edge, the outline of the edge is set parallel to the general visual appearance of the vertical cross section.

[0166] Referring to Figure 16, to reduce turbulence during airflow and thus lower noise, the bottom wall 222 of the recess 220 is parallel to the outer wall of the fan 300 near the lower end of the second air inlet 313. This means that the air passages 101 are parallel in cross-section. Parallel air passages 101 help the air flow evenly across the cross-section, reducing airflow unevenness and turbulence, thereby improving smoke extraction efficiency. More uniform airflow reduces noise caused by uneven airflow, providing a quieter kitchen environment for users. If the airflow is smoother, the energy consumption required by the fan 300 during operation may be reduced because the additional energy required to overcome turbulence is reduced.

[0167] During installation, the range hood 100 is connected to the wall via a mounting bracket. The mounting bracket is typically located on the rear panel 210 of the casing 200. To prevent the recess 220 from protruding excessively from the rear panel 210 and affecting the installation of the range hood, the depth of the recess 220 is limited to less than or equal to 12mm, and not zero. For example, 3mm, 5mm, 7mm, or 10mm.

[0168] The upper sidewall 221 and lower sidewall 223 of the clearance groove 220 in the vertical direction of the fan 300 are inclined. The depth of the clearance groove 220 is measured as the height from the bottom wall 222 of the groove to the unrecessed surface. If there are multiple inconsistencies, the average integer value is taken.

[0169] Because of the recessed groove 220, more space is provided for the fan 300, allowing for more effective use of the internal space of the casing 200 and optimizing the overall design. In this embodiment, the upper end of the fan 300 is tilted towards the smoke inlet 201. Thus, the first air inlet 312 of the fan 300 is tilted towards the smoke inlet 201, making it closer to the smoke inlet 201. This expands the suction range, enabling the range hood to absorb the fumes generated during cooking more quickly and comprehensively. This is especially important when the cooking area in the kitchen is large or there are multiple stoves, as a single air inlet may not be able to effectively absorb the fumes.

[0170] In addition, due to the setting of the clearance groove 220 and the parallel air passage 101, the second air inlet 313 can be stably supplied with air at the back panel 210. The gap between the second air inlet 313 and the back panel 210 will not change abruptly in the direction of flue gas flow due to the tilt of the fan 300. This optimizes the air duct of the fan 300, reduces air duct resistance loss, and lowers the noise of the whole machine.

[0171] In this embodiment, the casing 200 includes an upper casing 203 and a smoke collection hood 204 located below and connected to the upper casing 203. The exhaust port 202 is located on the upper casing 203, and the rear panel 210 is located on the smoke collection hood 204. The fan 300 includes a volute 310, and an air outlet 311a is located at the upper end of the volute 310. The first air inlet 312 and the second air inlet 313 are located on opposite sides of the volute 310. The range hood 100 also includes a support member 400, which is located on the rear panel 210 and below the clearance groove 220. The support member 400 supports the lower end of the volute 310, and part of the volute 310 is located inside the upper casing 203. With the support of the support member 400, the volute 310 is inclined towards the air inlet, so that the first air inlet 312 is closer to the smoke inlet 201, thereby improving the smoke extraction efficiency.

[0172] By placing the exhaust port 202 in the upper housing 203, the rear panel 210 in the smoke collection hood 204, and placing part of the fan 300 inside the upper housing 203, this design optimizes the spatial layout, making the overall structure more compact. The support member 400 supports the lower end of the volute 310, which helps to stabilize the structure of the fan 300, reduce vibration caused by wind, and reduce noise.

[0173] In addition, the air inlet screen installed at the second air inlet 313 of the volute has a mesh structure, which not only meets the safety requirements, but also reduces the eddy current at the air inlet 210 of the fan, so that the flue gas enters the fan system more evenly, improves the working efficiency of the fan impeller, and reduces the noise of the whole machine.

[0174] Without loss of generality, stability can be maintained by relying on the rigid structure of the chassis 200 or the strength of the fan 300 itself, without the support component 400. However, this may lead to structural deformation or vibration under high loads.

[0175] In addition, the support 400 can serve as a contact point for adjustment and maintenance, facilitating installation and maintenance work.

[0176] Furthermore, in order to reduce the noise of the entire machine, a reinforcing structure 240 is also provided on the back panel 210.

[0177] In this embodiment, the reinforcing structure 240 is a plurality of reinforcing grooves 241 formed by recesses on the back plate 210.

[0178] Referring to FIG17, specifically, the plurality of reinforcing grooves 241 include two first reinforcing grooves 242 and two second reinforcing grooves 243. The two first reinforcing grooves 242 are respectively disposed on both sides of the relief groove 220, and the two second reinforcing grooves 243 are disposed below the relief groove 220 and the second reinforcing grooves 243.

[0179] The depth of the reinforcing groove 241 is less than the depth of the relief groove 220. The depth of the reinforcing groove 241 is lower than the depth of the relief groove 220. By pressing with two different depths, the rigidity of the back panel 210 of the chassis 200 can be effectively improved, and the vibration and abnormal noise of the whole machine can be reduced.

[0180] Referring to Figure 17, the back panel 210 further includes a mounting protrusion 230. The sidewalls of the two second reinforcing grooves 243 overlap with the sides of the mounting protrusion 230, and a support member 400 is provided on the mounting protrusion 230. The adjacent sidewalls of the two second reinforcing grooves 243 protrude from the surface of the back panel 210 to form the mounting protrusion 230, and the support member 400 is provided on the mounting protrusion 230. The two reinforcing grooves are symmetrical about the mounting protrusion 230. The second reinforcing grooves 243 located below the relief groove 220 can improve the structural strength of the back panel 210. On the other hand, the two symmetrically arranged second reinforcing grooves 243 can cooperate with the two smoke inlets 201 provided in the smoke hood 204, each corresponding to one second reinforcing groove 243, to improve and optimize the smoke inlet path, improve the efficiency of the range hood 100, and enhance the visual appearance.

[0181] In other embodiments, the two second reinforcing grooves 243 are a single unit, and the mounting protrusion 230 is a single part installed in the entire second reinforcing groove 243.

[0182] In summary, by arranging multiple reinforcing grooves 241 around the relief groove 220 and limiting the depth of the multiple reinforcing grooves 241 to be different from that of the relief groove 220, the structural strength of the back panel 210 is improved; in addition, the protruding mounting protrusion 230 can further improve the structural strength of the back panel 210 without changing the material and thickness of the back panel 210, and avoid vibration and noise.

[0183] Referring to Figure 17, in order to reduce the accumulation of large areas of condensed oil stains on the surface of the back panel 210 and make it easier for users to clean, the back panel 210 is also provided with a guide structure 250, which is used to guide the oil to the middle area of ​​the back panel 210.

[0184] In this embodiment, the flow guiding structure 250 is provided on the reinforcing groove 241 and the relief groove 220, and the flow guiding structure 250 is used to guide the condensed oil to the middle area of ​​the back plate 210.

[0185] The flow guiding structure 250 includes two adjacent groove walls of the first reinforcing groove 242. The two adjacent groove walls are close to the relief groove 220 and inclined toward the lower side wall 223 of the relief groove 220 so that the oil flows to the location of the relief groove 220.

[0186] Furthermore, the flow guiding structure 250 also includes a lower sidewall 223 of the clearance groove 220 that slopes downwards from both ends to the middle in the width direction. This allows oil flowing towards the lower sidewall 223 of the clearance groove 220 to collect in the middle of the lower sidewall 223 under the influence of gravity. During steam cleaning or fumigation, the airflow entering the second air inlet 313 from the rear panel 210 exerts an upward force on the liquid on the rear panel 210. Under the influence of gravity, the oil also flows along the wall of the flow guiding groove in an inclined direction to the middle area of ​​the rear panel 210, flowing into the oil cup at the bottom of the chassis 200, thus preventing the liquid from leaving large oil stains on the rear panel 210 due to gravity.

[0187] In other embodiments, the flow guiding structure 250 can be a flow guiding rib, which can be disposed in the relief groove 220 (extending to both ends) or located on both sides of the relief groove 220.

[0188] To facilitate the collection of liquid and prevent oil accumulation, in this embodiment, the support member 400 has an oil cavity 410 and an oil port 420 communicating with the oil cavity 410 on its upper surface. The upper surface of the support member 400 slopes downward toward the smoke inlet 201, and the oil port 420 is closer to the smoke inlet 201 than the lower end of the volute 310. The oil cavity 410 in the support member 400 allows for convenient collection of grease and liquid flowing down from the range hood, preventing grease from accumulating inside the device. The downward slope of the upper surface of the support member 400 toward the smoke inlet 201 allows grease to flow along the slope to the oil port 420, preventing backflow or splashing of liquid.

[0189] Referring to Figure 17, specifically, the upper surface of the support member 400 has two curved sides that conform to the contour of the bottom of the volute 310. This provides better support and fixation, ensuring the stability of the volute 310 during operation and reducing noise caused by poor contact or vibration. It also facilitates the entry of oil into the oil port 420. Furthermore, the curved design not only offers functional advantages but also enhances the product's aesthetics.

[0190] Furthermore, the two side walls of the mounting protrusion 230 converge towards each other towards the bottom of the chassis 200, and the support member 400 is adapted to the contour of the mounting protrusion 230. The support member 400 is fitted onto the mounting protrusion 230. Oil flowing from the lower and side walls of the first reinforcing groove 242 towards the support member 400 under gravity and airflow partially flows into the oil cavity 410 from the oil port 420 of the support member 400; and partially flows into the oil cup at the bottom of the chassis 200 along the outer contour of the mounting protrusion 230 or the support member 400. This avoids leaving large areas of oil stains on the back panel 210, thus providing a cleaner visual experience in the visible area of ​​the back panel 210 during long-term use.

[0191] In addition, range hoods use a motor to drive a high-speed rotating impeller, creating a negative pressure zone inside the casing to draw cooking fumes into the hood. To meet safety regulations, range hoods currently primarily use oil filters within the casing to prevent accidents during the entry of fumes. Furthermore, as the fumes flow through the oil filter, larger particles are separated and adhere to the filter, reducing grease buildup inside the hood. However, the dense mesh of the oil filter results in higher air resistance and makes it prone to clogging, reducing the hood's efficiency.

[0192] More specifically, a range hood uses a motor-driven impeller in its fan system to generate negative pressure inside the volute, drawing external fumes into the hood's casing and then expelling them through the volute. To meet safety regulations, range hoods currently have an oil filter installed at the inlet of the smoke collection hood. The air inlet of the volute is open, which can easily generate large eddies, leading to noise.

[0193] The volute assembly 102 of this application will be described below with reference to Figures 18 to 22.

[0194] Please refer to Figure 18. This application proposes a volute assembly 102. By using an air inlet mesh 120 arranged on the air inlet 111 of the volute body 110, the air inlet mesh 120 has a mesh structure 131, which meets the safety requirements. At the same time, the air inlet mesh 120 is arranged on the air inlet 111 of the volute body 110, which can reduce the eddy current at the air inlet 111, so that the flue gas enters the fan system more evenly, improves the working efficiency of the fan impeller 170, and reduces the noise of the whole machine.

[0195] Please refer to Figure 20. In one embodiment of this application, the air inlet net 120 includes a net body 130. The net body 130 includes a mounting ring 140 and a net body 130. The net body 130 is provided with a mesh structure 131. The mesh structure 131 is located at the opening of the mounting ring 140. Please refer to Figure 19. The mounting ring 140 is installed on the edge of the air inlet 111, and the mounting ring 140 is provided with a baffle 150 that is close to the edge of the air inlet 111.

[0196] Before the baffle 150 is installed, the oil drips from the gap at the edge of the air inlet 111 under the action of gravity and falls outside the stove. The baffle 150 is located at the edge of the air inlet 111 and blocks the dripping oil, thereby solving the above problem.

[0197] The technical solution of this application applies the air inlet mesh 120 to the air inlet 111 of the volute body 110 of the range hood. First, it enables the range hood to meet safety regulations, ensuring the safe use of the fan and preventing fingers or other parts from being inhaled into the fan. Second, the mesh structure 131 can reduce the eddy current at the air inlet 111, allowing the smoke to enter the fan system more evenly, improving the working efficiency of the fan impeller 170, and reducing the noise of the whole machine. Third, the baffle 150, which abuts against the edge of the air inlet 111 after installation, blocks the gap between the mounting ring 140 and the air inlet 111, preventing condensed oil and condensate water (generated by steam cleaning) inside the fan system from flowing out of the gap and dripping from the air duct of the casing onto the stove outside the range hood.

[0198] Please refer to Figures 19 and 20. In this embodiment, air inlets 111 are provided on both the front and rear sides of the volute body 110. The two air inlets 111 are connected to the air duct of the casing. The volute body 110 is inclined, and the air inlet 111 on the front side is closer to the bottom of the air duct and serves as the inlet of the smoke hood, which can expand the suction range and enable the range hood to absorb the fumes generated during cooking more quickly and comprehensively. Especially when the cooking area in the kitchen is large or there are multiple stoves, a single air inlet 111 may not be able to absorb the fumes completely and effectively.

[0199] The flue gas entering the duct from the inlet of the fume hood passes through the air inlet screen 120 of the volute assembly 102 and is then discharged outside the volute. The mounting ring 140 is fixed to the volute body 110 by screws or other means. The air inlet 111 of the volute body 110 is annular, and the opening of the mounting ring 140 corresponds to the shape of the air inlet 111 of the volute body 110, meaning the opening is not limited to being annular. Due to installation and process errors, there is a gap between the mounting ring 140 and the volute body 110, such as between screws. In this case, the condensed oil formed by the condensation of fumes will drip from the gap under the action of gravity and pass through... The air duct drips from the inlet of the fume hood onto the stovetop; in addition, during the steam cleaning process of the range hood, condensate drips, affecting product quality and user experience. The baffle 150 is arranged inside the mounting ring 140. During installation, the baffle 150 is located inside the volute body 110 and at the edge of the air inlet 111 of the volute body 110, which is equivalent to being inserted into the air inlet 111. It acts as a barrier between the air inlet 111 and the mounting ring 140 to form a "sealed structure". Through the simple design of the baffle 150, the above problems are solved in a cost-effective way.

[0200] Please refer to Figure 21. The deflector 150 has various forms. In order for the deflector 150 to play the best role, the deflector 150 has an inner side 151 close to the annular opening. The inner side 151 is inclined along the outer side 152 away from the annular opening in the extending direction of the deflector 150.

[0201] Please refer to Figure 19. Specifically, for better blocking effect, the edge of the air inlet 111 is folded inward to form a skirt 112. The baffle 150 fits against the skirt 112, thus forming a tight vertical gap between the skirt 112 and the baffle 150. The oil passes through this vertical gap and "turns" before overflowing from the edge of the mounting ring 140 and the volute body 110, further improving the blocking effect. The contact between the skirt 112 and the baffle 150 should be understood as a "joining surface" relationship, just like joining tables together to reduce the gap between them.

[0202] Please refer to Figure 21. In this embodiment, the baffle 150 is in the form of a raised rib and is integrally set with the mounting ring 140. The inner side of the baffle 150 is chamfered, and the inclined inner side 151 plays a guiding role. The inclined design can increase the path of fluid (condensed oil / water) on the surface of the baffle 150. The inclined surface can make the fluid flow back into the fan system along the inclined direction and be collected by the oil collection cup.

[0203] Referring to Figure 19, specifically, the included angle between the inner side 151 and the outer side 152 of the deflector 150 ranges from 5° to 30°. The included angle is the angle at which the extended lines of the inner side 151 and the outer side 152 intersect. In this embodiment, the included angle is 15°. The selection of an angle range of 5° to 20° is based on considerations of practicality and efficiency. If the angle is too small (less than 5°), the guiding effect of the deflector 150 will be poor. Conversely, if the angle is too large (greater than 20°), although the blocking effect may be enhanced, the structural strength will be weakened, assembly will be prone to damage, and manufacturing will be more difficult. In other embodiments, the included angle is 5°, 6°, 8°, 10°, 18°, 19°, etc.

[0204] In other embodiments, the outer surface 152 is non-planar, and the inclined angle of the inner surface 151 is the angle with the extension line.

[0205] Please refer to Figure 18. Specifically, the extension length of the deflector 150 is greater than the length of the skirt 112, and the length of the deflector 150 is h, 3mm≤h≤9mm.

[0206] In this embodiment, the height of the baffle 150 is 6mm; in other embodiments, it can be 4mm, 5mm, 7mm, or 8mm. The limitation of the baffle 150's height between 3mm and 9mm is to ensure that it effectively blocks condensed oil and water without adversely affecting the performance of the range hood, while also considering manufacturing and cost rationality. If the baffle 150 is too low (less than 3mm), manufacturing is difficult and costly. If the baffle 150 is too high (greater than 9mm), it may create unnecessary resistance to the air intake, affecting the fan's suction efficiency. An excessively high baffle 150 may also change the direction of air intake, causing turbulent airflow, increasing noise, and potentially reducing the overall performance of the range hood. Furthermore, a height range of 3mm to 9mm is generally easy to manufacture, maintaining structural strength while avoiding unnecessary material waste, thus controlling costs. This height range also facilitates installation and replacement; it is not too thin to be difficult to operate, nor too thick to be difficult to secure. Moreover, the height range of 3mm to 9mm provides a moderate design space, allowing the baffle 150 to adapt to different models and specifications of range hoods, thus having a certain degree of versatility.

[0207] In this embodiment, the mounting ring 140 is further provided with an arc-shaped air guide structure 160 extending into the air inlet 111. The arc-shaped air guide structure 160 is formed by the mounting ring 140 curving from the edge of the ring opening, and acts as a volute air guide ring, which allows the airflow to enter the volute body 110 more smoothly and reduces the turbulence at the air inlet 111 of the volute body 110.

[0208] The distance from the outer surface of the air inlet edge to the outer surface of the impeller is L, and h and L satisfy 0.35≤h / L≤0.55. By limiting h and L within the above range, there is a sufficient distance between the baffle 150 and the impeller 170, which will not cause unnecessary resistance to the air inlet, and can also play a blocking role to prevent overflow from the volute through the gap.

[0209] Referring to Figures 18, 20 and 21, there is a certain distance between the arc-shaped air guide structure 160 and the baffle 150, and the arc-shaped air guide structure 160 and the baffle strip are connected by an arc-shaped transition. This helps the baffle 150 to function properly, and the flue gas and water vapor flow into the volute along the inclined inner side 151 at the arc-shaped transition, avoiding accumulation in the gap.

[0210] The arc-shaped air guide structure 160 is partially inserted into the interior of the impeller 170 after installation, allowing the flue gas passing through the mesh structure 131 to enter the fan system more evenly, improving the working efficiency of the impeller 170 and reducing the overall noise of the machine. Meanwhile, the baffle 150 reduces the eddy currents between the front plate of the volute and the front plate of the impeller 170, increasing the maximum static pressure and reducing the noise of the fan system, thus achieving a noise reduction effect and lowering the noise level during the operation of the range hood.

[0211] The difference between the inner diameter of the impeller 170 and the outer diameter of the arc-shaped air guide structure 160 is 3mm-5mm, which satisfies a certain assembly clearance.

[0212] In order to improve the grease separation efficiency of the whole machine and avoid grease clogging the mesh, the mesh structure 131 includes at least one mesh area, in which the aperture of the mesh gradually increases from the center of the mesh area outward.

[0213] Referring to Figures 20 and 21, specifically, the air mesh body 130 includes multiple main radial strips 132 radiating outward from the center of the air mesh body 130, and multiple annular components 133 with gradually increasing radii centered on the center. Each annular component 133 is connected to multiple main radial strips 132, thereby forming a mesh structure 131. Between two adjacent main radial strips 132, the mesh openings gradually increase along the radial direction, which can prevent the mesh openings from being blocked and improve the grease separation efficiency of the entire machine. Furthermore, the flue gas entering the duct from the exhaust port of the range hood needs to be drawn into the air inlet 111 through the mesh structure 131. The mesh structure 131 can weaken the vortex at the air inlet 111 of the fan, allowing the flue gas to enter the fan system more evenly, improving the working efficiency of the fan impeller and reducing the noise of the entire machine.

[0214] The mounting ring 140 is connected to the end of the main radiating strip 132; the concentrically arranged and gradually increasing annular components 133 form a fan-like structure for the air mesh body 130, which is fixed to the range hood by connecting to the volute via the mounting ring 140. In this embodiment, there are nine main radiating strips 132; the nine main radiating strips 132 are evenly distributed along the center of the air mesh body 130, with adjacent main radiating strips 132 having the same angle, and the main radiating strips 132 converge at a small annular structure at the center of the air mesh body 130, like an open umbrella rib. In other embodiments, the number of main radiating strips 132 can be two, three, five, six, eight, nine, etc.; the main radiating strips 132 can also be unevenly distributed or slightly different.

[0215] It should be noted that the center of the wind network body 130 refers to the geometric center of the wind network structure, that is, the point where all the main radial strips 132 and the annular components 133 intersect. The center of the wind network body 130 can be determined through measurement and calculation. First, the intersection point of all the main radial strips 132. Second, the convergence point of all the annular components 133 in their contracting directions is the center of the wind network body 130.

[0216] The gradually increasing radius of the annular component 133 means that it gradually increases in size with distance from the center; the annular component 133 is not limited to each annular component 133 being a complete circle; or the edge of the annular component 133 can be continuous and closed or discontinuous, semi-closed; visually, it appears as a gradually changing annulus.

[0217] The annular components 133 are spaced apart along the radiation direction. The mesh between two adjacent annular components 133 and two adjacent main radiating strips 132 is a "fan". Due to the uniform spacing, the height of the fan remains unchanged, but the bottom surface increases, so the area of ​​the mesh increases sequentially in the radiation direction.

[0218] The radial distribution refers to the main radiating strips 132 extending outward from the center, much like sunlight radiating outward from the center of the sun. This distribution exhibits clear directionality and symmetry; all the main radiating strips 132 originate from a common central point and expand outward in a straight line. Imagine the spokes of a wheel, all connected to the hub and extending towards the rim. In a wind network, this radial distribution helps to evenly distribute wind force, improving the stability and efficiency of the wind network.

[0219] In this embodiment, the air mesh body 130 is connected to the volute body 110 via a mounting ring 140. The mesh structure 131 corresponds to the air inlet 111. The opening of the mounting ring 140 is similar in size to the air inlet 111 of the volute body 110. The free ends of multiple main radiating strips 132 are respectively connected to the opening of the mounting ring 140. The multiple main radiating strips 132 converge from the connection point to the center to form a converging part, which is higher than the mounting ring 140. The design that the converging part is higher than the mounting ring 140 means that the converging part is located at a higher position than the mounting ring 140, which can be determined by directly observing or measuring the relative height between the two.

[0220] Referring to Figure 20, specifically, the height H between the surface of the collecting portion and the surface of the mounting ring 140 is 9mm ≤ H ≤ 15mm.

[0221] The arc-shaped volute assembly 102 creates a larger effective air intake area because this layout allows air to enter the air network from multiple directions, rather than just one. The radial design helps to evenly distribute the incoming airflow, reducing the possibility of localized high-speed airflow, which can reduce noise caused by excessive wind speed. Furthermore, the radial layout reduces turbulence and eddies in the incoming airflow, which can contribute to noise generation. Noise levels can be further reduced by optimizing the airflow path.

[0222] The size of the annular opening is similar to that of the volute inlet 111. Raising the central converging section creates an arc-shaped cover for the mesh structure 131. This arc-shaped cover guides airflow more smoothly into the air mesh, reducing noise generated by airflow impacting rigid edges. The curved surface facilitates smoother airflow, thus reducing noise. The arc-shaped cover concentrates airflow in the central area of ​​the air mesh, improving intake efficiency and increasing air volume. This concentrated airflow also helps reduce turbulence at the edges, further reducing noise. The arc-shaped cover design reduces reflected noise after airflow impacts the surface. Arc-shaped surfaces do not produce strong reflections like flat surfaces, thus reducing overall noise levels.

[0223] Furthermore, the edge of the mounting ring 140 extends in a direction opposite to the converging portion to form an arc-shaped air guide structure 160. During installation, a portion of the arc-shaped air guide structure 160 is embedded in the impeller 170 of the fan, reducing the vortices generated by the impeller 170 and the volute, which helps the airflow to flow more smoothly, thereby reducing noise.

[0224] Furthermore, to facilitate equipment installation and wiring, the mesh structure 131 is provided with a clearance opening 134, which separates part of the main radiating strip 132. The separated part of the main radiating strip 132 is located between the mounting ring 140 and the annular member 133 closest to the mounting ring 140.

[0225] Furthermore, the wind net body 130 is provided with multiple reinforcing ribs, which are respectively connected to the mounting ring 140 and the annular member 133 closest to the mounting ring 140, and divide the mesh between the two equally.

[0226] The reinforcing ribs can improve the rigidity and strength of the air mesh body 130. The reinforcing ribs help maintain the stability of the mesh structure 131, prevent the mesh from deforming due to external forces, and ensure the stability and uniformity of the ventilation effect. In addition, the reinforcing ribs can also prevent the mesh area from being too large, which would result in poor oil and gas filtration effect.

[0227] Specifically, the reinforcing rib extends to connect with the arc-shaped air guide structure 160. The arc-shaped air guide structure 160 is the outward extension of the edge of the mounting ring 140, and it may deform or be damaged due to external forces. Extending the reinforcing rib here improves the overall structural strength: after connecting the reinforcing rib to the arc-shaped air guide structure 160, the connections between the various parts of the air mesh body 130 (including the main radiating strips 132, the annular component 133, the mounting ring 140, and the arc-shaped air guide structure 160) are more robust, resulting in a more stable overall structure. As the edge portion of the air mesh body 130, the arc-shaped air guide structure 160 may bear uneven stress; the extension of the reinforcing rib helps to disperse these stresses, reducing the risk of damage due to stress concentration. Furthermore, if the design of the reinforcing rib is coordinated with the overall style, it can also enhance the aesthetics of the structure and improve the product's appearance.

[0228] Referring to Figure 21, further, two adjacent main radiating strips 132 and multiple annular members 133 form multiple mesh openings that gradually increase in size from the center outwards. A first dividing strip is provided between two adjacent main radiating strips 132, and the first dividing strip bisects the multiple mesh openings that gradually increase in size from the center outwards. By providing a first dividing strip between two adjacent main radiating strips 132 and bisecting the mesh openings that gradually increase in size from the center outwards, it is possible to ensure that the airflow passes through each mesh opening more evenly, thereby improving the overall ventilation efficiency. Moreover, the addition of the first dividing strip increases the rigidity of the air network. The design of the dividing strip helps to guide the airflow along a predetermined path, reducing unnecessary turbulence and eddies. By optimizing the airflow path and reducing turbulence and eddies, the noise level of the air network during operation can be reduced.

[0229] Specifically, a second partition strip is provided between the main radiating strip 132 and the first partition strip. The plurality of annular components 133 include a middle annular component 133 disposed in the middle of the main radiating strip 132 and an end annular component 133 disposed on the outermost side of the main radiating strip 132. The second partition strip connects the middle annular component 133 and the end annular component 133 and bisects the mesh between the middle annular component 133 and the end annular component 133.

[0230] By setting the first and second separators, the mesh size between adjacent main radiating strips 132 can be ensured to be consistent, thereby improving the mesh uniformity of the entire air mesh body 130. Furthermore, the presence of the first and second separators enhances the structural stability of the air mesh body 130, reduces vibration and deformation caused by wind, and extends the service life of the air mesh body 130. By precisely controlling the size and distribution of the mesh, the ventilation efficiency of the volute assembly 102 can be optimized, ensuring the uniformity and stability of airflow. This prevents the mesh from being too large, reducing the filtration effect, or too dense, causing high wind resistance and easy clogging by oil.

[0231] Referring to Figure 22, specifically, the distance between two adjacent annular members 133 is the length d of the defined mesh, 5mm≤d≤10mm. That is, the mesh cannot allow a column with a diameter of d to pass through, which means that the spacing between the annular members 322 is d, for example, d is 5mm, 6mm, 7mm, 8mm, 9mm, etc.

[0232] This application also proposes a range hood, which includes a casing, a volute assembly 102, and a fan assembly. The casing has an air duct, which includes a smoke inlet and a smoke outlet. The volute assembly 102 is disposed within the air duct and has an air inlet 111 communicating with the air duct and an air outlet communicating with the smoke outlet. The fan assembly is disposed within the volute assembly 102. A mesh structure 131 corresponds to the air inlet 111.

[0233] The specific structure of the volute assembly 102 is as described in the above embodiments. Since this range hood adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here. The volute assembly 102 has a mesh structure 131, which meets safety requirements and is located at the air inlet 111 of the volute body 110. This weakens the eddy current at the fan air inlet 111, allowing the smoke to enter the fan system more evenly, improving the working efficiency of the fan impeller 170, and reducing the overall noise. The outer surface 152 of the baffle 150 is close to the edge of the air inlet 111 and extends inward beyond the edge of the air inlet 111. Thus, the smoke drawn in from the mesh structure 131 is blocked by the baffle 150 and flows into the volute along the baffle 150, instead of flowing out from the gap between the mounting ring 140 and the volute.

[0234] In addition, range hoods typically include a casing, a centrifugal fan, and a rectifier. The rectifier is located between two adjacent smoke inlets to reduce the risk of mutual interference between the smoke fumes flowing in from the casing's inlets. However, in related technologies, the rectifier has a single function, resulting in a complex structure and high manufacturing cost for range hoods.

[0235] Referring to Figures 23 to 32, this application proposes a range hood.

[0236] Please refer to Figures 23 to 25. In one embodiment of this application, the range hood includes:

[0237] The housing 10 has a smoke inlet 11a, a smoke outlet 12a, and a smoke passage chamber 13a connecting the smoke inlet 11a and the smoke outlet 12a;

[0238] Centrifugal fan 30 includes a volute 31 disposed in the smoke passage chamber 13a and having an oil leakage hole 311b at the bottom; and

[0239] The rectifier 14 is located below the volute 31. At least two smoke inlets 11a are provided. The rectifier 14 is correspondingly provided at the interval between two adjacent smoke inlets 11a to divide the smoke passage 13a into at least two smoke passages.

[0240] The technical solution of this application, by setting the rectifier 14 at the interval between two adjacent smoke inlets 11a and dividing the smoke passage 13a into at least two smoke inlet channels, enables the oil fumes flowing in from different smoke inlets 11a to flow independently, thereby improving the problem of eddy currents and aerodynamic noise caused by the mutual interference of these oil fumes, and thus improving the overall operating noise of the range hood.

[0241] Referring to Figures 24, 26, and 27, without loss of generality, a range hood typically includes a housing 10, a centrifugal fan 30, and an oil nozzle. The centrifugal fan 30 typically has a volute 31 and a centrifugal impeller rotating within the volute 31. Through the high-speed rotation of the centrifugal impeller, not only are the fumes expelled from the range hood's intake to the exhaust outlet, but the grease in the fumes is also separated under centrifugal force. This grease separated inside the volute 31 flows naturally to and collects at the bottom of the volute 31 under gravity, and flows through the oil drain hole 311b at the bottom to the oil nozzle below the volute 31. From there, it flows to the bottom of the range hood and eventually into the oil cup.

[0242] In this embodiment, optionally, the rectifier 14 is disposed between two adjacent smoke inlets 11a and below the grease nozzle to reduce the risk of mutual interference between the fumes flowing in from the smoke inlets 11a of the housing 10. The grease nozzle can also receive and guide the airflow leaking from the oil leakage hole 311b to avoid interference of the leaked airflow with the intake airflow.

[0243] It is understandable that in related technologies where a range hood simultaneously incorporates a rectifier 14 and an oil nozzle, the rectifier 14 has a single function, resulting in a complex structure and high manufacturing cost for the range hood. To enrich the function of the rectifier 14, it is further provided with an oil inlet 21, an oil outlet 22, and an oil guiding channel 23 connecting the oil inlet 21 and the oil outlet 22. The oil inlet 21 is located at the upper end of the rectifier 14, corresponding to an oil leakage hole 311b.

[0244] Please refer to Figures 28 to 30 and 32, where the arrows in Figures 28, 30, and 32 indicate the direction of liquid flow. Specifically, by providing an oil inlet 21, an oil outlet 22, and an oil guiding channel 23 on the rectifier 14, the rectifier 14 also functions as an oil nozzle. That is, the liquid inside the volute 31 can flow out from the oil leakage hole 311b and into the oil inlet 21, then flow along the oil guiding channel 23 to the oil outlet 22, and finally flow out from the oil outlet 22 and into the oil cup, thereby preventing the liquid flowing out of the volute 31 from splashing and dripping onto the stove 90 or cookware located below the range hood.

[0245] It should be noted that in the embodiments of this application, the liquid includes, but is not limited to, grease, water, or oil-water mixture. For example, when the centrifugal fan 30 is used in a range hood with a steam cleaning function, the volute 31 can also collect the wastewater (i.e., oil-water mixture) after steam cleaning. At this time, the wastewater can flow into the rectifier 14 through the oil drain hole 311b and eventually flow into the oil cup.

[0246] In this embodiment of the application, by providing an oil inlet 21, an oil outlet 22, and an oil guiding channel 23 on the rectifier 14, the rectifier 14 not only has the function of dividing the smoke chamber 13a into multiple smoke inlet channels, but also has the function of an oil nozzle. This enriches the functions of the rectifier 14 and saves the original oil nozzle parts, which helps to simplify the structure and reduce the manufacturing cost of the range hood.

[0247] It is understood that the centrifugal fan 30 can have either one or two air inlets, meaning that the centrifugal fan 30 can have air inlets on both opposite end faces. For example, referring to Figure 27, in one embodiment, the volute 31 has a main air inlet 312a and a secondary air inlet 313a at opposite ends, respectively. The secondary air inlet 313a is adjacent to the rear end plate of the housing 10 and forms a secondary smoke inlet channel 316 with the rear end plate spaced apart. The main air inlet 312a forms a main smoke inlet channel 315 with the front end plate of the housing 10 spaced apart. In this case, most of the oil fumes can flow from the oil fume inlet through the main smoke inlet channel 315 and the main air inlet 312a into the volute 31, while a small portion of the oil fumes can flow from the oil fume inlet through the secondary smoke inlet channel 316 and the secondary air inlet 313a into the volute 31. Of course, in other embodiments, the secondary air inlet 313a and the secondary smoke inlet channel 316 may not be provided, or the main air inlet 312a and the main smoke inlet channel 315 may be located on the rear end face of the volute 31.

[0248] The rectifier 14 in this embodiment mainly serves to divert the airflow in the area near the smoke inlet 11a of the smoke passage 13a, thereby affecting the airflow distribution in the main smoke inlet channel 315 and the secondary smoke inlet channel 316. Referring to Figure 26, it can be seen that the fumes generated by the two cookware 90 flow into the smoke passage 13a through their respective smoke inlets 11a. Under the influence of the rectifier 14, these two streams of fumes follow their respective flow paths, that is, along the left and right sections of the main smoke inlet channel 315 and the secondary smoke inlet channel 316 separated by the rectifier 14, and flow to the main air inlet 312a and the secondary air inlet 313a of the centrifugal fan 30, respectively.

[0249] To better guide and separate the airflow, the rectifier 14 further has rectifying sides 20e on opposite sides of the smoke inlet 11a in the arrangement direction, and the distance between the two rectifying sides 20e gradually increases from bottom to top. That is, the width of the rectifier 14 gradually increases from bottom to top. Of course, in other embodiments, the distance between the two rectifying sides 20e may gradually decrease from bottom to top, or remain essentially unchanged.

[0250] Referring to Figures 26 and 30, optionally, the spacing between the two rectifying sides 20e is gradually increased from front to back. This avoids the formation of an airflow dead zone between the rear end of the rectifying side 20e and the rear end cavity surface of the smoke passage 13a, and facilitates directing more of the intake airflow to the main smoke inlet channel 315. Of course, in other embodiments, the spacing between the two rectifying sides 20e may gradually decrease from front to back, or remain essentially unchanged.

[0251] It is understandable that the fumes entering the smoke chamber 13a will condense on the outer surface of the volute 31 to form grease. This grease will flow down the outer surface of the volute 31 under the action of gravity. If it is not guided, it will easily drip from the smoke inlet 11a onto the stove 90 or cooking utensils.

[0252] Therefore, referring to Figures 28 and 29, optionally, the top surface of the rectifier 14 extends downward at an angle close to the side where the oil inlet 21 is located. The rear side of the top surface of the rectifier 14 protrudes below the lower side of the rear end face of the volute 31, and the front side of the top surface of the rectifier 14 protrudes below the lower side of the front end face of the volute 31. In this way, the top surface of the rectifier 14 can also receive and collect grease from the outer surface of the volute 31, thereby further reducing the risk of grease dripping randomly from the range hood.

[0253] It should be noted that the left-right, up-down, and front-back directions in this application embodiment refer to the orientation of the range hood after it is correctly installed, and the side of the range hood facing the stove 90 is defined as the front, and the side away from the stove 90 is defined as the rear.

[0254] It can be understood that the rear edge of the top surface of the rectifier 14 protrudes beyond the lower edge of the rear end face of the volute 31, meaning that in the front-rear direction, the rear edge of the top surface of the rectifier 14 is positioned further back than the lower edge of the rear end face of the volute 31. Similarly, the front edge of the top surface of the rectifier 14 protrudes beyond the lower edge of the front end face of the volute 31, meaning that in the front-rear direction, the front edge of the top surface of the rectifier 14 is positioned further forward than the lower edge of the front end face of the volute 31.

[0255] Of course, in other embodiments, only the rear side of the top surface of the rectifier 14 protrudes from the lower side of the rear end surface of the volute 31. For example, the bottom surface of the volute 31 extends backward and downward at an angle, so that the grease on the outer surface of the volute 31 can first collect at the rear end of its bottom surface and then flow to the rectifier 14; or, only the front side of the top surface of the rectifier 14 protrudes from the lower side of the front end surface of the volute 31. For example, the bottom surface of the volute 31 extends forward and downward at an angle, so that the grease on the outer surface of the volute 31 can first collect at the front end of its bottom surface and then flow to the rectifier 14.

[0256] Referring to Figures 24 and 28, optionally, the top surface of the rectifier 14 is adapted to abut against the bottom surface of the volute 31. That is, the top surface of the rectifier 14 is designed to conform to its shape, so as to achieve the effect of its entire surface covering the bottom surface of the volute 31. In this way, the problem of significant vortices forming in the airflow within the smoke passage 13a at the gap between the rectifier 14 and the volute 31, which would lead to increased noise, can be avoided. Of course, in other embodiments, one end of the rectifier 14 may abut against the bottom surface of the volute 31, rather than its entire surface covering the bottom surface of the volute 31.

[0257] Generally speaking, the centrifugal fan 30 is typically installed in the range hood in a roughly horizontal position, meaning that the axes of the centrifugal fan 30 and the volute 31 are parallel or roughly parallel to the horizontal plane. In this embodiment, optionally, the bottom wall of the volute 31 extends downwards in a back-to-forehead direction, with an oil drain hole 311b located at the front end of the bottom wall of the volute 31, and an oil inlet 21 located at the front end of the top surface of the rectifier 14. That is, the bottom surface of the centrifugal fan 30 forms an acute angle with the vertical plane, and the lower side of the front end face of the volute 31 is the lowest point of its outer surface. This is more conducive to the rectifier 14 collecting grease from the outer surface of the volute 31, thereby further improving the grease collection function of the rectifier 14.

[0258] Referring to Figure 26, optionally, the front edge of the oil inlet 21 protrudes beyond the lower side of the front end face of the volute 31. That is, in the front-rear direction, the front edge of the oil inlet 21 is positioned further forward than the lower side of the front end face of the volute 31. Since the lower side of the front end face of the volute 31 is the lowest point of its outer surface, grease on its outer surface tends to accumulate in this area under gravity. By positioning the oil inlet 21 below this area, the grease accumulated in this area can drip directly into the oil inlet 21, further reducing the risk of grease from the outer surface of the volute 31 accidentally dripping onto the stove 90 or cookware. Of course, in other embodiments, the front edge of the oil inlet 21 may also be positioned further back than the lower side of the front end face of the volute 31.

[0259] Referring to Figures 29 and 32, optionally, the bottom wall of the rectifier 14 extends downward at an angle away from the oil inlet 21, and the oil outlet 22 is located at the lower end of the bottom wall of the rectifier 14. Thus, the oil outlet 22 is located at the rear end of the rectifier 14, which can guide the grease away from the rear side of the smoke chamber 13a of the main air intake channel, thereby reducing the risk of the liquid flowing out of the oil outlet 22 splashing and dripping randomly due to interference from the airflow of the main air intake channel.

[0260] Referring to Figure 28, optionally, the rear side of the bottom wall of the rectifier 14 abuts against the rear cavity wall of the smoke passage chamber 13a, and the oil outlet 22 is configured as a notch. In this way, the grease flowing from the oil outlet 22 can directly transition to the rear cavity wall of the smoke passage chamber 13a and flow downwards along the rear cavity wall until it flows into the oil cup, thereby further reducing the risk of liquid splashing due to airflow interference. Of course, in other embodiments, the rear side of the bottom wall of the rectifier 14 may be spaced apart from the rear cavity wall of the smoke passage chamber 13a, or the oil outlet 22 may be configured as an oil outlet hole.

[0261] It is understandable that the oil drain hole 311b not only allows grease to flow through, but also serves as a channel for airflow and noise leakage within the volute 31. Therefore, the rectifier 14 further includes a sound-absorbing structure and a sound inlet connected to the sound-absorbing structure, with the sound inlet corresponding to the oil drain hole 311b. This weakens the energy of the aerodynamic noise leaking from the oil drain hole 311b, achieving a noise reduction effect. In other words, the rectifier 14 also functions as a reactive silencer, further enriching its functionality and simplifying the structure and reducing manufacturing costs of the range hood. Of course, in other embodiments, the sound-absorbing structure and sound inlet may not be provided.

[0262] Please refer to Figures 25, 28 to 32, where the "W"-shaped wavy curves in Figures 28, 30, and 32 represent noise. To further enhance the noise reduction effect of the rectifier 14, the noise reduction structure includes multiple noise reduction cavities 24, at least one of which is connected to a sound inlet. The rectifier 14 also has sound passage holes 25 connecting two adjacent noise reduction cavities 24. Thus, the multiple noise reduction cavities 24 are connected through the sound passage holes 25 and work together to reduce noise energy in multiple ways. Of course, in other embodiments, the noise reduction structure can also be configured as noise-absorbing cotton, etc., and the noise-absorbing cotton is stuffed into the inner cavity of the rectifier 14.

[0263] Referring to Figures 30 and 32, in embodiments where the rectifier 14 has an oil inlet 21 and an oil guide channel 23, optionally, the sound inlet and the oil inlet 21 are configured with the same structure, and the oil guide channel 23 is connected to the silencing cavity 24. That is, the silencing cavity 24 and the oil guide channel 23 partially overlap. This simplifies the structure of the rectifier 14 and reduces its manufacturing cost. Of course, in other embodiments, the sound inlet and the oil inlet 21 may be configured with different structures. For example, the sound inlet and the oil inlet 21 may be spaced apart on the top surface of the rectifier 14; the silencing cavity 24 may also be isolated from the oil guide channel 23. In other embodiments, the rectifier 14 may only function as a reactive silencer and not as an oil nozzle, that is, the rectifier 14 does not have an oil inlet 21, an oil outlet 22, and an oil guide channel 23.

[0264] The rectifier 14 has various structural forms. For example, in one embodiment, referring to Figures 25 and 31, the rectifier 14 includes a cover 20a and a partition 20b disposed in the middle of the cover 20a. The opening of the cover 20a faces rearward. The partition 20b and the cover 20a together enclose a plurality of sound-absorbing cavities 24, and a sound-passing hole 25 is disposed on the partition 20b. In this way, the structure is simple and easy to manufacture. Furthermore, the rearward orientation of the cover 20a can guide the airflow leaking from the oil leakage hole 311b to the rear side of the smoke chamber 13a, that is, to the side away from the main smoke inlet channel 315, thereby reducing the disturbance effect of the leaked airflow on the airflow in the main smoke inlet channel 315 and improving the problems of eddies and aerodynamic noise generated therefrom.

[0265] Referring to Figures 25 and 31, optionally, the partition 20b includes a first plate portion 20c and a second plate portion 20d. The first plate portion 20c extends in the left-right direction and is located in the middle of the cover 20a, and has an oil passage hole 26 corresponding to the oil inlet 21. A sound passage hole 25 is located in the first plate portion 20c, and the second plate portion 20d extends in the up-down direction and is located in the middle of the cover 20a. This results in a simple structure and facilitates the manufacturing of the rectifier 14. It is understood that in the embodiment shown in Figure 25, only one first plate portion 20c and one second plate portion 20d are provided, that is, only four sound-absorbing cavities 24 are formed. However, those skilled in the art will understand that the number of first plate portions 20c and second plate portions 20d can be increased, and can be adjusted according to actual needs.

[0266] Optionally, the diameter of the sound passage 25 is greater than or equal to 3 mm, for example, the diameter is set to 4 mm, 6 mm or 8 mm, to avoid the problem of the sound passage 25 being blocked by grease.

[0267] It is understood that the airflow leaking from the oil drain hole 311b has a high velocity, thus generating significant aerodynamic noise. To address this issue, optionally, the first plate portion 20c is positioned closer to the lower end of the cover 20a, thereby increasing the distance between the first plate portion 20c and the oil drain hole 311b. This forces most of the leaking airflow from the oil drain hole 311b to travel a longer propagation path before reaching the top surface of the first plate portion 20c. This reduces the velocity of the leaking airflow impacting the first plate portion 20c and reduces the noise caused by this impact. Of course, in other embodiments, the first plate portion 20c can also be positioned closer to the upper end of the cover 20a, or centrally located.

[0268] Referring to Figures 25 and 31, optionally, multiple sound passage holes 25 are provided, and the multiple sound passage holes 25 are distributed on the first plate portion 20c in the front-back direction. In this way, the leakage airflow and leakage noise leaking from the oil leakage hole 311b can flow to different silencing cavities 24 more and more quickly, so as to improve the overall silencing effect of the rectifier 14.

[0269] Referring to Figure 25, optionally, the rectifier 14 is detachably mounted on the housing 10 to facilitate disassembly, maintenance, and cleaning. It is understood that there are various ways to detachably mount the rectifier 14. For example, referring to Figure 25, the rectifier 14 has snap-fit ​​portions 271 on both sides and mounting lugs 272 at the bottom. The snap-fit ​​portions 271 are engaged with the back plate of the housing 10, and the mounting lugs 272 are secured to the back plate of the housing 10 with screws. Of course, other detachable mounting methods can be used in other embodiments, and this application does not specifically limit them.

[0270] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A range hood, characterized in that, include: The housing has a smoke inlet chamber inside, and the housing also has a smoke inlet port that communicates with the smoke inlet chamber; A smoke collection plate is rotatably mounted on the housing and has a closed position for closing the smoke inlet and an open position for opening the smoke inlet; as well as A flow guiding structure is fixed on the side of the smoke collecting plate facing the smoke inlet, and the flow guiding structure is used to guide the oil fumes to the smoke inlet.

2. The range hood as described in claim 1, characterized in that, The flow guiding structure includes a first flow guiding plate, which has a first flow guiding surface that is angled to the smoke gathering plate.

3. The range hood as described in claim 2, characterized in that, The longitudinal profile of the first guide surface is a straight line or an arc.

4. The range hood as described in claim 2 or 3, characterized in that, The extended surface of the first guide surface passes through the smoke inlet.

5. The range hood as described in claim 4, characterized in that, The flow guiding structure further includes a second flow guiding plate, wherein the first flow guiding plate is fixedly connected to the smoke gathering plate through the second flow guiding plate, and the second flow guiding plate is at least partially attached to the smoke gathering plate.

6. The range hood as described in claim 5, characterized in that, The second guide plate includes a first connecting section, a guide section, and a second connecting section connected in sequence. Both the first connecting section and the second connecting section are attached to the smoke collecting plate. The guide section has a second guide surface protruding toward the smoke inlet.

7. The range hood as described in claim 6, characterized in that, The first guide surface is located above the second guide surface; In the direction close to the first guide surface, the distance between the second guide surface and the smoke gathering plate first increases and then decreases.

8. The range hood as described in claim 6 or 7, characterized in that, The first guide plate is connected to the end of the second connecting section away from the guide section; Alternatively, the first guide plate is connected between the second connecting section and the guide section.

9. The range hood as described in claim 8, characterized in that, A support plate is fixed to the side of the first guide plate that is away from the first guide surface.

10. The range hood according to any one of claims 6 to 9, characterized in that, The second connecting section includes a first section and a second section connected together. The first section is attached to the smoke-collecting plate, and the second section is located on the side of the first guide plate away from the first guide surface and is connected to the first guide plate.

11. The range hood as described in claim 10, characterized in that, The free end of the first guide plate abuts against the side of the first section away from the smoke gathering plate.

12. The range hood according to any one of claims 5 to 11, characterized in that, The first guide plate and the second guide plate are integrally formed.

13. The range hood according to any one of claims 1 to 12, characterized in that, When the smoke collection plate is in the closed position, the flow guiding structure is spaced apart from the edge of the smoke inlet.

14. The range hood as described in claim 13, characterized in that, The edge of the smoke inlet is provided with a clearance groove for the flow guiding structure to extend into.

15. A range hood, characterized in that, include: The fan includes an air outlet and a first air inlet and a second air inlet located opposite each other on both sides of the fan. and The chassis has a smoke inlet and a smoke outlet, the fan is located inside the chassis, the air outlet is connected to the smoke outlet, the chassis includes a rear panel opposite to the side of the smoke inlet, the fan is spaced apart from the rear panel, and the surface of the rear panel near the second air inlet is recessed in a direction away from the fan to form a clearance groove, and an air passage is formed between the surface of the fan and the groove wall of the clearance groove.

16. The range hood as described in claim 15, characterized in that, In the left-right direction of the range hood, the width of the clearance groove is greater than or equal to the width of the fan.

17. The range hood as described in claim 15 or 16, characterized in that, The bottom wall of the relief groove is parallel to the outer wall surface of the lower end of the fan near the second air inlet.

18. The range hood according to any one of claims 15 to 17, characterized in that, The clearance groove includes a lower sidewall that extends beyond the bottom of the fan and slopes downward toward the fan.

19. The range hood as described in claim 18, characterized in that, The clearance groove also includes an upper sidewall opposite to the lower sidewall, the end of which is inclined upward and parallel to the lower edge of the second air inlet.

20. The range hood according to any one of claims 15 to 19, characterized in that, The depth of the relief groove is less than or equal to 12 mm.

21. The range hood according to any one of claims 15 to 20, characterized in that, The rear panel also features a reinforcing structure.

22. The range hood as described in claim 21, characterized in that, The reinforcing structure consists of multiple reinforcing grooves formed by recesses on the rear back plate.

23. The range hood as described in claim 22, characterized in that, The depth of each reinforcing groove is less than the depth of the yielding groove.

24. The range hood as described in claim 23, characterized in that, The plurality of reinforcing grooves include two first reinforcing grooves and two second reinforcing grooves. The two first reinforcing grooves are respectively disposed on both sides of the relief groove, and the two second reinforcing grooves are disposed below the relief groove and the second reinforcing grooves.

25. The range hood as described in claim 24, characterized in that, Both the reinforcing groove and the relief groove are provided with a flow guiding structure, which is used to guide the oil to the middle area of ​​the back plate.

26. The range hood as described in claim 25, characterized in that, The flow guiding structure includes two adjacent groove walls of the first reinforcing groove, which are close to the relief groove and inclined toward the lower side wall of the relief groove.

27. The range hood as described in claim 26, characterized in that, The flow guiding structure also includes the lower sidewall of the relief groove, which slopes downward from both ends toward the middle in the width direction.

28. The range hood as described in claim 27, characterized in that, The chassis includes an upper housing and a smoke collection hood located below and connected to the upper housing. The smoke exhaust port is located on the upper housing, and the rear panel is located on the smoke collection hood. The fan includes a volute, and the air outlet is located at the upper end of the volute. The first air inlet and the second air inlet are located on opposite sides of the volute. The range hood also includes a support member, which is located on the back panel and below the clearance groove. The support member supports the lower end of the volute, part of which is located inside the upper housing and part of which is located inside the smoke collection hood.

29. The range hood as described in claim 28, characterized in that, The rear panel is also provided with a mounting protrusion, two second reinforcing grooves are located on both sides of the mounting protrusion, and the support member is provided on the mounting protrusion.

30. The range hood as described in claim 29, characterized in that, The two side walls of the mounting protrusion approach each other in the direction towards the bottom of the chassis, and the support member is adapted to the contour of the mounting protrusion.

31. A volute assembly for a range hood, characterized in that, The volute assembly includes: The volute body has an air inlet; and An air inlet screen includes a mounting ring and an air inlet screen body disposed on the mounting ring. The air inlet screen body has a mesh structure. The mounting ring abuts against the edge of the air inlet and the mounting ring also has a baffle near the edge of the air inlet.

32. The volute assembly as claimed in claim 31, characterized in that, The air inlet has an inwardly folded skirt along its edge, and the air deflector is close to the skirt.

33. The volute assembly as claimed in claim 31 or 32, characterized in that, The flow deflector has an inner side surface near the mesh structure and an outer side surface opposite to the inner side surface, the inner side surface being inclined toward the outer side surface in the extending direction of the flow deflector.

34. The volute assembly as claimed in claim 33, characterized in that, The angle between the inner side of the flow deflector and the horizontal is in the range of 5°-30°.

35. The volute assembly as claimed in claim 32, characterized in that, The extension length of the flow deflector is greater than the length of the skirt, and the length of the flow deflector is h, where 3mm ≤ h ≤ 9mm.

36. The volute assembly as claimed in any one of claims 31-35, characterized in that, The volute assembly also includes a fan wheel disposed within the volute body. The length of the baffle is h, and the distance from the outer surface of the edge of the air inlet to the outer surface of the fan wheel is L. h and L satisfy 0.35≤h / L≤0.

55.

37. The volute assembly as claimed in any one of claims 31 to 36, characterized in that, The mounting ring is also provided with an arc-shaped air guide structure extending into the air inlet.

38. The volute assembly as claimed in any one of claims 31 to 37, characterized in that, The mesh structure includes at least one mesh region, in which the aperture of the mesh gradually increases from the center of the mesh region outward.

39. The volute assembly as claimed in claim 38, characterized in that, The wind network body includes multiple main radial strips distributed radially outward from the center of the wind network body; and Multiple annular components with gradually increasing radii centered on the center, each annular component being connected to multiple main radiating strips, and the free ends of the multiple main radiating strips being connected to the mounting ring respectively.

40. A range hood, characterized in that, include: The chassis has an air duct, and a smoke inlet and a smoke outlet communicating with the air duct; The volute assembly as described in any one of claims 31 to 39, wherein the volute assembly is disposed within the air duct and has an air inlet communicating with the air duct and an air outlet communicating with the smoke exhaust outlet; and The fan assembly is located inside the volute assembly.

41. A range hood, characterized in that, include: The housing has a smoke inlet, a smoke outlet, and a smoke passage cavity connecting the smoke inlet and the smoke outlet; Centrifugal fan, including a volute housing located in the smoke passage chamber and having an oil leakage hole at the bottom; as well as A rectifier is located below the volute. At least two smoke inlets are provided. The rectifier is correspondingly disposed at the interval between two adjacent smoke inlets to divide the smoke passage into at least two smoke inlet channels. The rectifier has an oil inlet, an oil outlet, and an oil guide channel connecting the oil inlet and the oil outlet. The oil inlet is located at the upper end of the rectifier, corresponding to the oil leakage hole.

42. The range hood as described in claim 41, characterized in that, The top surface of the rectifier extends downward at an angle close to the side where the oil inlet is located, and the rear side of the top surface of the rectifier protrudes from the lower side of the rear end face of the volute, and / or the front side of the top surface of the rectifier protrudes from the lower side of the front end face of the volute.

43. The range hood as described in claim 41 or 42, characterized in that, The bottom wall of the volute extends downwards in a back-to-forehead direction, the oil leakage hole is located at the front end of the bottom wall of the volute, and the oil inlet is located at the front end of the top surface of the rectifier.

44. The range hood as described in claim 43, characterized in that, The front edge of the oil inlet protrudes from the lower side of the front end face of the volute. And / or, the top surface of the rectifier is adapted to abut against the bottom surface of the volute.

45. The range hood as described in claim 43 or 44, characterized in that, The bottom wall of the rectifier extends downwards in a front-to-back direction, and the oil outlet is located at the lower end of the bottom wall of the rectifier.

46. ​​The range hood according to any one of claims 41 to 45, characterized in that, The rectifier is provided with a sound-absorbing structure and a sound inlet connected to the sound-absorbing structure, and the sound inlet is provided corresponding to the oil leakage hole.

47. The range hood as described in claim 46, characterized in that, The silencing structure includes multiple silencing cavities, at least one of the silencing cavities is connected to the sound inlet, and the rectifier is also provided with a sound passage hole connecting two adjacent silencing cavities.

48. The range hood as described in claim 47, characterized in that, The sound inlet and the oil inlet are configured with the same structure, and the oil guide channel is connected to the sound-absorbing cavity; And / or, the rectifier includes a cover and a partition disposed in the middle of the cover, the cover opening of the cover is disposed rearward, the partition and the cover together enclose a plurality of the sound-absorbing cavities, and the sound passage is disposed on the partition.

49. The range hood according to any one of claims 41 to 48, characterized in that, The rectifier has rectifying sides on opposite sides of the arrangement direction of the smoke inlet, and the distance between the two rectifying sides gradually increases from bottom to top.

50. The range hood as described in claim 49, characterized in that, The spacing between the two rectifier sides is gradually increased from front to back.

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