Range hood

Abstract

The utility model discloses a range hood, and relates to the technical field of range hoods, the range hood comprises a casing, a centrifugal fan and a rectifying part, the casing is provided with a smoke inlet, a smoke outlet and a smoke passing cavity communicated between the smoke inlet and the smoke outlet; the centrifugal fan comprises a volute arranged in the smoke passing cavity and provided with an oil leakage hole in the bottom. The rectifying part is located below the volute, the number of the smoke inlets is at least two, and the rectifying part is correspondingly arranged at the interval of every two adjacent smoke inlets so as to divide the smoke passing cavity into at least two smoke inlet channels; the rectifying part is provided with a silencing structure and a sound inlet communicated with the silencing structure, and the sound inlet corresponds to the oil leakage hole. The technical scheme provided by the utility model can enrich the function of the rectifying piece.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and particularly relates to a range hood. Background Art

[0002] A range hood generally includes a housing, a centrifugal fan and a rectifying member. The rectifying member is arranged between two adjacent smoke inlets to reduce the risk of mutual interference of the oil fume flowing in from the smoke inlets of the housing. However, in the related art, the function of the rectifying member is single, resulting in a complex structure and high manufacturing cost of the range hood. Summary of the Utility Model

[0003] The main object of the utility model is to provide a range hood, aiming to enrich the functions of the rectifying member.

[0004] To achieve the above object, the range hood provided by the utility model includes:

[0005] A housing having a smoke inlet, a smoke outlet and a smoke passage communicating between the smoke inlet and the smoke outlet;

[0006] A centrifugal fan including a volute provided in the smoke passage and having an oil leakage hole at the bottom; and

[0007] A rectifying member located below the volute, at least two smoke inlets are provided at the smoke inlet, and the rectifying member is correspondingly arranged at the interval between two adjacent smoke inlets to divide the smoke passage into at least two smoke inlet channels;

[0008] The rectifying member is provided with a sound absorption structure and a sound inlet communicating with the sound absorption structure, and the sound inlet is correspondingly arranged with respect to the oil leakage hole.

[0009] In an embodiment, the sound absorption structure includes a plurality of sound absorption cavities communicating with the sound inlet.

[0010] In an embodiment, the rectifying member includes a cover body and a partition plate provided in the middle of the cover body. The cover opening of the cover body faces backward, and the partition plate and the cover body jointly enclose a plurality of the sound absorption cavities, and the sound inlet is arranged on the upper side wall of the cover body.

[0011] In an embodiment, the rectifying member is further provided with a sound passage hole communicating two adjacent sound absorption cavities, and the sound passage hole is arranged on the partition plate.

[0012] In an embodiment, the rectifying member has an oil receiving port, an oil outlet port and an oil guiding channel communicating the oil receiving port and the oil outlet port. The oil receiving port is arranged on the upper side wall of the cover body corresponding to the oil leakage hole, and the oil outlet port is arranged on the lower side wall of the cover body.

[0013] In one embodiment, the intake port and the oil receiving port are configured as the same structure, and the oil guiding channel is arranged in the cover body and communicated with the sound absorption cavity.

[0014] In one embodiment, the partition plate includes a first plate portion and a second plate portion. The first plate portion is arranged in the middle of the cover body extending in the left-right direction, and an oil passing hole is provided corresponding to the oil receiving port. The second plate portion is arranged in the middle of the cover body extending in the up-down direction.

[0015] In one embodiment, the aperture of the sound passing hole is greater than or equal to 3 mm.

[0016] In one embodiment, a plurality of sound passing holes are provided, and the plurality of sound passing holes are distributed on the partition plate in the front-back direction.

[0017] In one embodiment, on opposite sides of the rectifying member in the arrangement direction of the smoke inlet, there are rectifying side surfaces, and the distance between the two rectifying side surfaces is gradually increased in the direction from bottom to top.

[0018] In one embodiment, the distance between the two rectifying side surfaces is gradually increased in the direction from front to back.

[0019] The technical solution of the present utility model can weaken the energy of the pneumatic noise leaking from the oil leakage hole and achieve the noise reduction effect by providing an incident hole and a sound absorption structure on the rectifying member. That is, the rectifying member also functions as a reactive muffler, thereby enriching the functionality of the rectifying member and facilitating the simplification of the structure and manufacturing cost of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and for those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the range hood provided by the present utility model;

[0022] Figure 2 It is Figure 1 the internal structural diagram of the shown embodiment;

[0023] Figure 3 It is Figure 2 the structural diagram of the rectifying member in

[0024] Figure 4 It is Figure 1Partial sectional view of the illustrated embodiment;

[0025] Figure 5 is Figure 4 the sectional view at A-A in;

[0026] Figure 6 is Figure 5 the partial view of the illustrated structure located at the bottom;

[0027] Figure 7 is Figure 3 the left view of the illustrated rectifying member;

[0028] Figure 8 is Figure 7 the sectional view at B-B in;

[0029] Figure 9 is Figure 7 the sectional view at C-C in;

[0030] Figure 10 is Figure 8 the sectional view at D-D in.

[0031] Explanation of the reference numerals in the drawings:

[0032] 10. Housing; 11. Smoke inlet; 12. Smoke outlet; 13. Smoke passage;

[0033] 20. Rectifying member; 20a. Cover body; 20b. Partition; 20c. First plate part; 20d. Second plate part; 20e. Rectifying side; 21a. Oil receiving port; 21b. Sound inlet; 22. Oil outlet; 23. Oil guiding channel; 24. Sound absorption cavity; 25. Sound passage hole; 26. Oil passage hole; 271. Clamping part; 272. Mounting lug;

[0034] 30. Centrifugal fan; 31. Volute; 311. Oil leakage hole; 312. Main air inlet; 313. Auxiliary air inlet; 314. Air outlet; 315. Main smoke passage; 316. Auxiliary smoke passage;

[0035] 90. Cooker.

[0036] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] The present utility model provides an oil fume extractor.

[0041] Please refer to Figures 1 to 3 , in an embodiment of the present utility model, the oil fume extractor includes:

[0042] A casing 10 having a smoke inlet 11, a smoke outlet 12, and a smoke passage 13 communicating between the smoke inlet 11 and the smoke outlet 12;

[0043] A centrifugal fan 30 including a volute 31 disposed in the smoke passage 13 and having an oil leakage hole 311 at the bottom; and

[0044] A rectifying member 20 located below the volute 31. There are at least two smoke inlets 11, and the rectifying member 20 is correspondingly disposed at the interval between two adjacent smoke inlets 11 to divide the smoke passage 13 into at least two smoke inlet channels.

[0045] According to the technical solution of the present utility model, by disposing the rectifying member 20 at the interval between two adjacent smoke inlets 11 and dividing the smoke passage 13 into at least two smoke inlet channels, it can enable the oil fume flowing in from different smoke inlets 11 to flow independently of each other, thereby improving the problems of eddy current and pneumatic noise caused by the interference of these oil fumes, and further improving the overall operating noise of the oil fume extractor.

[0046] Please refer to Figure 2 , Figure 4 and Figure 5, without loss of generality, an oil fume extractor generally includes a housing 10, a centrifugal fan 30 and an oil nozzle. The centrifugal fan 30 generally has a volute 31 and a centrifugal impeller rotatably disposed within the volute 31. Through the high-speed rotation of the centrifugal impeller, not only can the oil fume be discharged from the air inlet of the oil fume extractor to the smoke exhaust port, but also the grease in the oil fume can be separated under the action of centrifugal force. These greases separated inside the volute 31 will flow naturally under the action of gravity, converge at the bottom of the volute 31, and flow through the oil leakage hole 311 at the bottom to the oil nozzle below the volute 31, and then flow to the bottom of the oil fume extractor through the oil nozzle until it flows into the oil cup.

[0047] In an embodiment of the present utility model, optionally, the rectifying member 20 is disposed between two adjacent air inlet openings 11 and is located below the oil nozzle to reduce the risk of mutual interference of the oil fume flowing into the air inlet openings 11 of the housing 10. The oil nozzle can also receive and guide the air flow leaking from the oil leakage hole 311 to avoid the interference of the leakage air flow on the intake air flow.

[0048] It can be understood that in the related art where the oil fume extractor is provided with both the rectifying member 20 and the oil nozzle, the function of the rectifying member 20 is single, resulting in a complex structure and high manufacturing cost of the oil fume extractor. To enrich the function of the rectifying member 20, further, the rectifying member 20 has an oil receiving port 21a, an oil outlet 22 and an oil guiding channel 23 connecting the oil receiving port 21a and the oil outlet 22. The oil receiving port 21a is disposed at the upper end of the rectifying member 20 corresponding to the oil leakage hole 311.

[0049] Please refer to Figures 6 to 8 and Figure 10 , wherein, Figure 6 、 Figure 8 and Figure 10 The arrows in indicate the flow direction of the liquid. Specifically, by providing the oil receiving port 21a, the oil outlet 22 and the oil guiding channel 23 on the rectifying member 20, the rectifying member 20 also has the function of the oil nozzle, that is, the liquid in the volute 31 can flow out from the oil leakage hole 311 and enter the oil receiving port 21a, then flow along the oil guiding channel 23 to the oil outlet 22, and finally flow out from the oil outlet 22 and flow to the oil cup, thereby preventing the liquid flowing out of the volute 31 from splashing and dripping randomly on the cooker 90 or the cookware located below the oil fume extractor.

[0050] It should be noted that in an embodiment of the present utility model, the liquid includes but is not limited to grease or water or a mixture of oil and water. For example, when the centrifugal fan 30 is applied to an oil fume extractor with a steam cleaning function, the volute 31 can also collect the sewage (i.e., a mixture of oil and water) after steam cleaning. At this time, the sewage can flow into the rectifying member 20 through the oil leakage hole 311 and finally flow to the oil cup.

[0051] In the embodiment of the present utility model, by providing an oil receiving port 21a, an oil outlet 22 and an oil guiding channel 23 on the rectifying member 20, the rectifying member 20 not only has the function of dividing the smoke passing cavity 13 into a plurality of smoke inlet channels, but also has the function of an oil nozzle, thereby enriching the functions of the rectifying member 20 and being able to save the original oil nozzle parts, which is beneficial to simplifying the structure and manufacturing cost of the range hood.

[0052] It can be understood that the number of air inlets of the centrifugal fan 30 can be one or two, that is, the centrifugal fan 30 can be provided with air inlets on both opposite end faces. For example, please refer to Figure 5 , in an embodiment, a main air inlet 312 and a secondary air inlet 313 are respectively provided at opposite ends of the volute 31. The secondary air inlet 313 is adjacent to the rear end plate of the housing 10 and a secondary smoke inlet channel 316 is formed at an interval from the rear end plate. A main smoke inlet channel 315 is formed at an interval between the main air inlet 312 and the front end plate of the housing 10. At this time, most of the oil fume can flow from the oil fume inlet through the main smoke inlet channel 315, the main air inlet 312 and into the volute 31, and a small part of the oil fume can flow from the oil fume inlet through the secondary smoke inlet channel 316, the secondary air inlet 313 and into the volute 31. Of course, in other embodiments, the secondary air inlet 313 and the secondary smoke inlet channel 316 may not be provided, or the main air inlet 312 and the main smoke inlet channel 315 are located at the rear end face of the volute 31.

[0053] The rectifying member 20 of the embodiment of the present utility model mainly plays a role in diverting the airflow in the area of the smoke passing cavity 13 close to the smoke inlet 11, thereby affecting the airflow distribution in the main smoke inlet channel 315 and the secondary smoke inlet channel 316. Please refer to Figure 4 , it can be seen that the oil fume generated from the two cookers 90 respectively flows into the smoke passing cavity 13 through their corresponding smoke inlets 11, and affected by the rectifying member 20, these two streams of oil fume follow their respective flow paths, that is, along the left and right two parts of the channels divided by the rectifying member 20 in the main smoke inlet channel 315 and the secondary smoke inlet channel 316, and flow to the main air inlet 312 and the secondary air inlet 313 of the centrifugal fan 30 respectively.

[0054] In order to enable the rectifying member 20 to better guide and divide the airflow, further, the rectifying member 20 has rectifying side faces 20e on opposite sides in the arrangement direction of the smoke inlet 11, and the distance between the two rectifying side faces 20e is gradually increased in the direction from bottom to top. That is, the width of the rectifying member 20 is gradually increased in the direction from bottom to top. Of course, in other embodiments, the distance between the two rectifying side faces 20e may also be gradually decreased in the direction from bottom to top, or be set to be basically unchanged.

[0055] Please refer to Figure 4 and Figure 8Optionally, the distance between the two rectifying side surfaces 20e is gradually increased in the direction from the front to the back. In this way, it is possible to avoid the formation of an airflow dead zone between the rear end of the rectifying side surface 20e and the rear end cavity surface of the smoke passage chamber 13, and it is beneficial to guide more of the intake airflow to the main smoke inlet channel 315. Of course, in other embodiments, the distance between the two rectifying side surfaces 20e can also be gradually reduced in the direction from the front to the back, or be basically unchanged.

[0056] It is understandable that the oil smoke that enters the smoke chamber 13 will also condense on the outer surface of the volute 31 to form grease. The grease will flow downward along the outer surface of the volute 31 under the action of gravity. If not guided, it will easily drip from the smoke inlet 11 onto the stove 90 or cooking utensils.

[0057] Therefore, please refer to Figure 6 and Figure 7 Optionally, the top surface of the fairing 20 extends downwardly along the direction close to the side where the oil receiving port 21a is located, and the rear side edge of the top surface of the fairing 20 protrudes from the lower side edge of the rear end surface of the volute 31, and the front side edge of the top surface of the fairing 20 protrudes from the lower side edge of the front end surface of the volute 31. In this way, the top surface of the fairing 20 can also receive and collect grease from the outer surface of the volute 31, thereby further reducing the risk of grease dripping from the range hood.

[0058] It should be noted that the left and right, up and down, and front and back directions in the embodiment of the utility model refer to the orientation of the range hood after correct installation, 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.

[0059] It can be understood that the rear side edge of the top surface of the fairing 20 protrudes from the lower side edge of the rear end surface of the volute 31, which means that in the front-to-back direction, the rear side edge of the top surface of the fairing 20 is arranged further back than the lower side edge of the rear end surface of the volute 31. Similarly, the front side edge of the top surface of the fairing 20 protrudes from the lower side edge of the front end surface of the volute 31, which means that in the front-to-back direction, the front side edge of the top surface of the fairing 20 is arranged further forward than the lower side edge of the front end surface of the volute 31.

[0060] Of course, in other embodiments, only the rear side edge of the top surface of the fairing 20 may protrude from the lower side edge of the rear end surface of the volute 31, for example, the bottom surface of the volute 31 may extend obliquely backward and downward, so as to enable the grease on the outer surface of the volute 31 to first gather at the rear end of its bottom surface and then flow to the fairing 20; or, only the front side edge of the top surface of the fairing 20 may protrude from the lower side edge of the front end surface of the volute 31, for example, the bottom surface of the volute 31 may extend obliquely forward and downward, so as to enable the grease on the outer surface of the volute 31 to first gather at the front end of its bottom surface and then flow to the fairing 20.

[0061] See also Figure 2 andFigure 6 , optionally, the top surface of the rectifying member 20 is adapted to abut against the bottom surface of the volute 31. That is, the top surface of the rectifying member 20 is designed to follow the shape, so as to basically achieve the effect that its entire surface adheres to the bottom surface of the volute 31. In this way, it is possible to avoid the problem that the airflow in the smoke passage 13 forms a significant eddy current at the gap between the rectifying member 20 and the volute 31, resulting in an increase in noise. Of course, in other embodiments, one end of the rectifying member 20 may also abut against the bottom surface of the volute 31, rather than the entire surface adhering to the bottom surface of the volute 31.

[0062] Without loss of generality, the centrifugal fan 30 is generally installed in the range hood in a substantially horizontal posture, that is, the axial directions of the centrifugal fan 30 and the volute 31 are parallel or substantially parallel to the horizontal plane. In the embodiment of the present utility model, optionally, the bottom wall of the volute 31 extends downwardly and obliquely in the direction from the rear to the front, the oil leakage hole 311 is provided at the front end of the bottom wall of the volute 31, and the oil receiving port 21a is provided at the front end of the top surface of the rectifying member 20. That is, the bottom surface of the centrifugal fan 30 is disposed at an acute angle with the vertical plane, and the lower side edge of the front end surface of the volute 31 is the lowest point of its outer surface. In this way, it is more beneficial for the rectifying member 20 to collect the grease on the outer surface of the volute 31, so as to further enhance the grease collection function of the rectifying member 20.

[0063] Please refer to Figure 6 , optionally, the front side edge of the oil receiving port 21a protrudes from the lower side edge of the front end surface of the volute 31. That is, in the front-rear direction, the front side edge of the oil receiving port 21a is disposed more forward than the lower side edge of the front end surface of the volute 31. In this way, since the lower side edge of the front end surface of the volute 31 is the lowest point of its outer surface, the grease on its outer surface is likely to gather in this area under the action of gravity. By providing the oil receiving port 21a below this area, the grease gathered in this area can directly drip into the oil receiving port 21a, which can further reduce the risk that the grease on the outer surface of the volute 31 accidentally drips onto the cooking appliance 90 or the cooking utensil. Of course, in other embodiments, the front side edge of the oil receiving port 21a may also be disposed more backward than the lower side edge of the front end surface of the volute 31.

[0064] Please refer to Figure 7 and Figure 10 , optionally, the bottom wall of the rectifying member 20 extends downwardly and obliquely in the direction away from the oil receiving port 21a, and the oil outlet 22 is provided at the lower end of the bottom wall of the rectifying member 20. In this way, the oil outlet 22 is located at the rear end of the rectifying member 20, and can direct the grease to the rear side of the smoke passage 13 away from the main air intake passage, thereby reducing the risk that the liquid flowing out of the oil outlet 22 is splashed and dripped randomly under the interference of the airflow in the main air intake passage.

[0065] Please refer to together Figure 6, optionally, the rear side edge of the bottom wall of the rectifying member 20 abuts against the rear cavity wall of the smoke passing cavity 13, and the oil outlet 22 is configured as a notch groove. In this way, the grease flowing out from the oil outlet 22 can directly flow over to the rear cavity wall of the smoke passing cavity 13 and flow down along the rear cavity wall until it flows into the oil cup, thereby further reducing the risk of the liquid splashing randomly due to air flow interference. Of course, in other embodiments, the rear side edge of the bottom wall of the rectifying member 20 may be spaced from the rear cavity wall of the smoke passing cavity 13, or the oil outlet 22 may be configured as an oil outlet hole.

[0066] It can be understood that the oil leakage hole 311 not only allows grease to flow through, but also becomes a channel for the air flow and noise in the volute 31 to leak out. Therefore, further, the rectifying member 20 is provided with a sound absorption structure and a sound inlet 21b communicating with the sound absorption structure, and the sound inlet 21b is arranged corresponding to the oil leakage hole 311. In this way, by providing the incident hole 21b and the sound absorption structure on the rectifying member 20, the pneumatic noise leaking out from the oil leakage hole 311 can be energy-weakened and the noise reduction effect can be achieved. That is, the rectifying member 20 also functions as a reactive muffler, thereby enriching the functionality of the rectifying member 20 and being beneficial to simplifying the structure and manufacturing cost of the range hood. Of course, in other embodiments, the sound absorption structure and the sound inlet 21b may not be provided.

[0067] Please refer to Figure 3 , Figures 6 to 10 , wherein, Figure 6 , Figure 8 and Figure 10 the "W"-shaped wavy curve in represents noise. In order to improve the sound absorption effect of the rectifying member 20, further, the sound absorption structure includes a plurality of sound absorption cavities 24, and the sound absorption cavities 24 communicate with the sound inlet 21b. In this way, the noise can be dispersed and weakened respectively in the plurality of sound absorption cavities 24. That is, the plurality of sound absorption cavities 24 can jointly play a multiple energy-weakening role on the noise. Of course, in other embodiments, the sound absorption structure may also be configured as sound absorption cotton, etc., and the sound absorption cotton is stuffed into the inner cavity of the rectifying member 20.

[0068] Please refer to Figure 8 and Figure 10 , in the embodiment where the rectifying member 20 has an oil receiving port 21a and an oil guiding channel 23, optionally, the sound inlet 21b and the oil receiving port 21a are configured as the same structure, and the oil guiding channel 23 is arranged in the cover body 20a and communicates with the sound absorption cavity 24. That is, a part of the sound absorption cavity 24 and the oil guiding channel 23 overlap. In this way, the structure of the rectifying member 20 can be simplified and its manufacturing cost can be reduced. Of course, in other embodiments, the sound inlet 21b and the oil receiving port 21a may also be configured as different structures. For example, the sound inlet 21b and the oil receiving port 21a are spaced on the top surface of the rectifying member 20; the sound absorption cavity 24 may also be arranged separately from the oil guiding channel 23. For example, the oil guiding channel is configured as a conduit located on the outer side surface of the cover body.

[0069] Of course, it can be understood that the structural design of the inlet port 21b of the rectifying member 20 and the muffling cavity 24 does not necessarily depend on the structures of the oil receiving port 21a, the oil outlet 22, and the oil guiding channel 23 as the design basis. Therefore, in other embodiments, the rectifying member 20 may only have the function of a reactive muffler and not have the function of an oil nozzle, that is, the rectifying member 20 is not provided with the oil receiving port 21a, the oil outlet 22, and the oil guiding channel 23.

[0070] There are various structural forms of the rectifying member 20. For example, in one embodiment, please refer to Figure 3 and Figure 9 , the rectifying member 20 includes a cover body 20a and a partition plate 20b disposed in the middle of the cover body 20a. The cover opening of the cover body 20a faces backward. The partition plate 20b and the cover body 20a jointly enclose a plurality of muffling cavities 24. The inlet port 21b is disposed on the upper side wall of the cover body 20a. In this way, the structure is simple and convenient for the production and manufacture of the rectifying member 20. Moreover, since the cover opening of the cover body 20a faces backward, the airflow leaking from the oil leakage hole 311 can be guided to the rear side of the smoke passing cavity 13, that is, to the side away from the main smoke inlet channel 315, thereby reducing the disturbance effect of the leakage airflow on the airflow in the main smoke inlet channel 315 and improving the problems of eddy current and aerodynamic noise generated therefrom.

[0071] Please refer to Figure 3 , optionally, in an embodiment where the rectifying member has an oil receiving port (21a) and an oil outlet (22), the oil receiving port (21a) is disposed on the upper side wall of the cover body (20a), and the oil outlet (22) is disposed on the lower side wall of the cover body (20a).

[0072] Please refer to Figure 3 , optionally, the rectifying member 20 is further provided with a sound passing hole 25 communicating adjacent two muffling cavities 24. The sound passing hole 25 is disposed on the partition plate 20b. In this way, it is beneficial for the noise to propagate between the plurality of muffling cavities 24 and to make the energy of the noise be more evenly dispersed in different muffling cavities 24, thereby improving the noise reduction effect. Of course, in other embodiments, the sound passing hole 25 may not be provided. For example, in an embodiment where the rectifying member is provided with an oil passing hole 26, the plurality of muffling cavities 24 are connected through the oil passing hole 26; or the plurality of muffling cavities are arranged in the left-right direction, and there are a plurality of inlet ports which are correspondingly communicated with the plurality of muffling cavities one by one.

[0073] Please refer to Figure 3 and Figure 9, optionally, the partition plate 20b includes a first plate portion 20c and a second plate portion 20d. The first plate portion 20c is provided at the middle part of the cover body 20a and extends along the left - right direction, and an oil - passing hole 26 is provided corresponding to the oil receiving port 21a. The second plate portion 20d is provided at the middle part of the cover body 20a and extends along the up - down direction. In this way, the structure is simple and it is convenient for the production and manufacturing of the rectifying member 20. It can be understood that Figure 3 In the illustrated embodiment, 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 can understand that the number of the first plate portion 20c and the second plate portion 20d can also be set to be more, and can be specifically adjusted according to actual needs.

[0074] In the embodiment where the rectifying member has a sound - passing hole 25, optionally, the sound - passing hole 25 is provided on the first plate portion 20c, and the aperture of the sound - passing hole 25 is greater than or equal to 3 mm. For example, the aperture is set to 4 mm, 6 mm or 8 mm to avoid the problem that the sound - passing hole 25 is blocked by grease.

[0075] It can be understood that the airflow leaking out from the oil leakage hole 311 has a relatively high flow rate and thus generates a large amount of aerodynamic noise. To solve this problem, optionally, the first plate portion 20c is arranged close to the lower end of the cover body 20a, so that the first plate portion 20c has a larger distance from the oil leakage hole 311. Thus, most of the leakage airflow flowing out from the oil leakage hole 311 needs to pass through a longer propagation path before reaching the top surface of the first plate portion 20c. In this way, the flow rate of the leakage airflow when it impacts on the first plate portion 20c can be reduced, and the noise caused by this impact can be reduced. Of course, in other embodiments, the first plate portion 20c can also be arranged close to the upper end of the cover body 20a or in the middle.

[0076] Please refer to Figure 3 and Figure 9 , optionally, a plurality of sound - passing holes 25 are provided, and the plurality of sound - passing holes 25 are distributed on the first plate portion 20c along the front - back direction. In this way, the leakage airflow and leakage noise leaking out from the oil leakage hole 311 can flow to different sound - absorbing cavities 24 more and more quickly, so as to improve the overall sound - absorbing effect of the rectifying member 20.

[0077] Please refer to Figure 3 , optionally, the rectifying member 20 is detachably installed on the machine shell 10 to facilitate the disassembly, maintenance and cleaning of the rectifying member 20. It can be understood that there are various detachable installation methods for the rectifying member 20. For example, please refer to Figure 3 , further, clamping portions 271 are provided on both sides of the rectifying member 20, and mounting lugs 272 are provided at the bottom. The clamping portions 271 are clamped on the back plate of the machine shell 10, and the mounting lugs 272 are locked to the back plate of the machine shell 10 by screws. Of course, in other embodiments, other detachable installation methods can also be adopted, and the present application does not make specific limitations thereto.

[0078] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A range hood, characterized in that: include: The housing has a smoke inlet, a smoke outlet, and a smoke passage cavity connected between the smoke inlet and the smoke outlet; A centrifugal fan, comprising a volute disposed in the smoke chamber and having an oil leakage hole at the bottom; as well as A rectifying member is located below the volute, the smoke inlets are provided with at least two, and the rectifying member is correspondingly arranged at the interval between two adjacent smoke inlets to separate the smoke passage cavity into at least two smoke inlet channels; The rectifying component is provided with a muffler structure and a sound inlet connected to the muffler structure, and the sound inlet is arranged corresponding to the oil leakage hole.

2. The range hood according to claim 1, characterized in that: The sound-absorbing structure includes a plurality of sound-absorbing cavities, and the sound-absorbing cavities are connected to the sound inlet.

3. The range hood according to claim 2, characterized in that: The fairing component includes a cover body and a partition plate arranged in the middle of the cover body, the cover opening of the cover body is arranged backward, the partition plate and the cover body together enclose a plurality of the muffler cavities, and the sound inlet is arranged on the upper side wall of the cover body.

4. The range hood according to claim 3, characterized in that: The rectifying member is further provided with a sound-through hole communicating with two adjacent muffler cavities, and the sound-through hole is arranged on the partition.

5. The range hood according to claim 4, characterized in that: The aperture of the sound hole is greater than or equal to 3 mm; And / or, the sound transmission holes are provided in plurality, and the plurality of sound transmission holes are distributed on the partition along the front-to-back direction.

6. The range hood according to claim 3, characterized in that: The rectifying member has an oil receiving port, an oil outlet and an oil guide passage connecting the oil receiving port and the oil outlet. The oil receiving port is arranged on the upper side wall of the cover body corresponding to the oil leakage hole, and the oil outlet is arranged on the lower side wall of the cover body.

7. The range hood according to claim 6, characterized in that: The sound inlet and the oil receiving port are configured as the same structure, and the oil guide channel is arranged in the cover body and communicated with the muffler cavity.

8. The range hood according to claim 7, characterized in that: The partition includes a first plate portion and a second plate portion. The first plate portion is arranged in the middle of the cover body extending in the left-right direction and is provided with an oil hole corresponding to the oil receiving port. The second plate portion is arranged in the middle of the cover body extending in the up-down direction.

9. The range hood according to any one of claims 1 to 8, characterized in that: The rectifying member has rectifying side surfaces on two opposite sides in the arrangement direction of the smoke inlet, and the distance between the two rectifying side surfaces is gradually increased in a direction from bottom to top.

10. The range hood according to claim 9, characterized in that: The distance between the two rectifying side surfaces is gradually increased in the direction from the front to the rear.

Images