CN113776097A

CN113776097A - Fan assembly and range hood

Info

Publication number: CN113776097A
Application number: CN202110924155.4A
Authority: CN
Inventors: 胡克吉
Original assignee: Hisense Guangdong Kitchen and Bath System Co Ltd
Current assignee: Hisense Shandong Kitchen and Bathroom Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2021-12-10

Abstract

The invention discloses a fan assembly and a range hood, relates to the technical field of range hood devices, and aims to reduce noise generated in the range hood. The fan assembly comprises a volute, a motor and an impeller, wherein the motor and the impeller are positioned in the volute, the output end of the motor is connected with the impeller, and the impeller is of a double-layer structure. The volute is provided with a first air inlet and a second air inlet, the fan assembly further comprises an air inlet guide cover which is arranged at the first air inlet, the air inlet guide cover comprises a net-shaped structure and a guide ring which is arranged around the net-shaped structure, and the net-shaped structure covers the first air inlet. The invention is used for carrying out noise reduction treatment on the range hood.

Description

Fan assembly and range hood

Technical Field

The invention relates to the technical field of range hood devices, in particular to a fan assembly and a range hood.

Background

In the prior art, when the range hood is used, a motor in the range hood drives a impeller to rotate, then, oil smoke above a cooking bench is sucked away through a range hood smoke collection hood, under the action of the suction force of the impeller, air flow can generate larger noise after the collision of the air flow in the range hood, and the larger the power is, the larger the noise is, the lower the noise is, and the lower the noise is, and the lower the noise is, and the noise is generated.

With more and more consumers pursuing quality of life, the use experience requirement on the range hood is higher and higher, and low noise becomes an important standard for selecting the range hood.

Disclosure of Invention

The embodiment of the invention provides a fan assembly and a range hood, which are used for reducing noise generated by the range hood during operation.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

on one hand, the embodiment of the invention provides a fan assembly, which comprises a volute, a motor and an impeller, wherein the motor and the impeller are positioned in the volute;

the volute is provided with a first air inlet, the fan assembly further comprises an air inlet guide cover which is arranged at the position of the first air inlet, the air inlet guide cover comprises a net-shaped structure and a guide ring which is arranged around the net-shaped structure, and the net-shaped structure covers the first air inlet.

The fan assembly provided by the embodiment of the invention solves the problems that the air flow in the fan assembly is not smooth and generates larger noise, the impeller is of a double-layer structure, the fan assembly has enough suction force, and the first air inlet is covered by the mesh structure under the condition of ensuring that the suction force is not changed, so that the air flow passing through the first air inlet passes through the mesh structure, and the mesh structure can disperse the passing air flow, thereby reducing the noise.

Further, the surface of the guide ring away from the volute casing forms an arc-shaped bulge.

Further, the net structure comprises a plurality of spokes and a ring connecting the spokes together to form a three-dimensional cone.

Further, the volute comprises: the first guide inclined plane is arranged on one side, close to the smoke collecting hood of the range hood, of the volute front plate. The volute back plate is connected with the volute surrounding plate and is arranged opposite to the volute front plate, and the volute front plate, the volute surrounding plate and the volute back plate are connected and surrounded to form a volute cavity for accommodating the motor; one side of the volute rear plate, which is close to the smoke collecting hood of the range hood, is provided with a second guide inclined plane. The included angles between the first guide inclined plane and the volute casing enclosing plate and the included angles between the second guide inclined plane and the volute casing enclosing plate are acute angles.

Furthermore, a second air inlet is formed in the volute and is opposite to the first air inlet;

the volute back plate further comprises a convex ring which is arranged at the second air inlet in a surrounding mode, and the surface, far away from the volute, of the convex ring forms an arc-shaped bulge.

On the other hand, the embodiment of the invention provides a range hood, which comprises the fan assembly mentioned in any one of the technical schemes;

this range hood still includes: lampblack absorber collection petticoat pipe and frame main part, frame main part are linked together with lampblack absorber collection petticoat pipe, and the fan subassembly sets up in the frame main part for inhale in the fan subassembly and get rid of the gas in the lampblack absorber collection petticoat pipe.

The range hood that this application embodiment provided and the fan subassembly that above-mentioned embodiment provided can obtain the same technological effect, and here is no longer repeated.

Further, range hood still includes the part of making an uproar that falls, should fall the part of making an uproar and set up on the inner wall of frame main part, and be located between fan subassembly and the lampblack absorber collection petticoat pipe, fall the part of making an uproar and be used for reducing the noise that gets into in the frame main part.

Furthermore, the noise reduction component comprises a shell and noise reduction cotton, the shell is buckled on the inner wall of the rack main body, and a noise reduction cavity is formed between the shell and the inner wall of the rack main body. The noise reduction cotton is positioned in the noise reduction cavity. The casing includes a plurality of first boards of making an uproar of falling, and a plurality of first boards of making an uproar of falling are in proper order the end to end. The first noise reduction plate is provided with a through hole.

Further, the noise reduction features also include a second noise reduction plate, and two third noise reduction plates. The second falls the board of making an uproar and is connected with the inner wall of frame main part, and the first board of making an uproar of falling is located the second and falls the board of making an uproar and keep away from frame main part one side, and two third fall the board of making an uproar and set up relatively, and fall the board with the first board of making an uproar and the second and fall the board and be connected.

Further, the diameter of each through hole is 2-5 mm, and the distance between every two adjacent through holes is 2-5 mm.

Drawings

FIG. 1 is a schematic cross-sectional view of a fan assembly provided by the present invention;

FIG. 2 is a schematic view of an intake air guide shroud provided by the present invention;

FIG. 3 is a side view of FIG. 2 in accordance with the present invention;

FIG. 4 is a schematic view of the volute and the fan housing assembly according to the present invention after being connected;

FIG. 5 is another perspective view of FIG. 4 in accordance with the present invention;

FIG. 6 is a schematic illustration of the volute backplate of FIG. 4 provided by the present invention;

FIG. 7 is a side schematic view of FIG. 6 in accordance with the present invention;

FIG. 8 is a schematic cross-sectional view of a range hood provided by the present invention;

FIG. 9 is a schematic illustration of the noise reduction features of FIG. 8 provided in accordance with the present invention;

FIG. 10 is a schematic view of noise reducing cotton provided by the present invention;

FIG. 11 is a schematic view of the connection between the main frame and the outlet housing according to the present invention;

fig. 12 is a schematic view of the direction of airflow in the range hood according to the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In one aspect, an embodiment of the present invention provides a fan assembly, as shown in fig. 1, the fan assembly 3 includes a volute 31, and a motor 32 and an impeller 33 located in the volute 31, an output end of the motor 32 is connected to the impeller 33, and the impeller 33 is of a double-layer structure.

The volute casing 31 is provided with a first air inlet 311, and the fan assembly 3 further includes an air inlet guide cover 5 installed at the first air inlet 311. Fig. 2 and fig. 3 are schematic diagrams of different angles of the intake guiding cover 5 in the embodiment of the present application, and the intake guiding cover 5 includes a mesh structure 51 and a guiding ring 52 surrounding the mesh structure. The mesh structure 51 covers the first air inlet 311. Because the mesh structure 51 covers the first air inlet 311, the air flow passing through the first air inlet 311 passes through the mesh structure 51, the mesh structure 51 can disperse the passing air flow, so as to reduce noise, and the air inlet guide cover 5 can fix the mesh structure 51 on the first air inlet 311.

The fan assembly provided by the embodiment of the invention solves the problems that the air flow in the fan assembly 3 is not smooth and generates large noise, the impeller 33 is of a double-layer structure, so that the fan assembly 3 has sufficient suction force, and under the condition of ensuring that the suction force is not changed, the mesh structure 51 is adopted to cover the first air inlet 311, so that the air flow passing through the first air inlet 311 passes through the mesh structure 51, and the mesh structure 51 can disperse the passing air flow, thereby reducing the noise.

Based on the above, the structure of the above-mentioned guide ring 52 of the present application is further described below, and in other embodiments of the present application, the surface of the guide ring 52 away from the volute casing 31 forms an arc-shaped protrusion, which guides the airflow to rapidly enter the volute casing 31 and plays a role in noise reduction. Because the setting of arc arch, consequently be equivalent to the indirect entry grow that makes first air inlet 311 department, the collection air current that can be more quick to arc arch can form an effectual changeover portion, makes the air current can be smooth enter into inside from the spiral case 31 outside, thereby falls the noise.

As mentioned above, the guiding ring 52 and the net-like structure 51 can be used together, so that, as described further below, the net-like structure 51 of the present application can include a plurality of spokes 511 and a ring 512 connecting the plurality of spokes 511 together, so as to form the three-dimensional cone shape in fig. 3, thereby enlarging the guiding area and reducing noise. In this application, network structure 51 also can be foraminiferous other structures, can guarantee that the air current can smoothly pass through can, for example, the centre of cross is the structure of quad slit, in some embodiments of this application, first air inlet department 311 is circular, network structure 51 comprises spoke 511 and ring 512, spoke 511 is by the center to the equidistant setting of dispersing all around, and ring 512 equidistant arrangement, and so on, the structure atress of constituteing is more stable, also can effectual dispersion when the air current passes through, thereby reach the noise reduction effect.

Based on the above, fig. 4 and 5 are schematic diagrams of different angles of the volute 31 in the embodiments of the present application, and in some embodiments of the present application, the volute 31 includes: a volute shroud 313, a volute front plate 314, and a volute back plate 315. The side of the volute front plate 314 close to the fume collecting hood 1 of the range hood is provided with a first guide inclined plane 3141 which guides airflow to enter a fan system in sequence and plays a role in noise reduction. The volute back plate 315 is connected to the volute shroud 313 and is disposed opposite the volute front plate 314, and the volute front plate 314, the volute shroud 313 and the volute back plate 315 are connected to enclose a volute cavity for accommodating the motor 32. One side of the volute rear plate 315 close to the smoke collecting hood 1 of the range hood is provided with a second guide inclined plane 3151, which guides airflow to enter the fan system in sequence and plays a role in noise reduction. The included angles between the first guiding inclined surface 3141 and the second guiding inclined surface 3151 and the volute enclosing plate 313 are acute angles. When the airflow enters the volute casing 31, a part of the airflow enters the bottom of the volute casing 31, and the bottom right angle in the prior art is changed into the inclined plane structure of the present application, so that a rapid transition can be formed when the airflow passes through, and a buffer is formed for the impact force generated by the airflow entering, so as to reduce the noise.

For example, in some embodiments of the present application, fig. 6 and fig. 7 are schematic diagrams illustrating different angles of a volute back plate 315 in the embodiments of the present application, and a second air inlet 312 is disposed on the volute 31 and is opposite to the first air inlet 311. The volute back plate 315 further includes a protruding ring 3121, which is disposed around the second air inlet 312. The surface of the convex ring 3121 away from the volute 31 forms an arc-shaped bulge, which guides the air flow to enter the fan system in sequence and plays a role in noise reduction. The arcuate projections of the present application are functionally equivalent to the arcuate projections of the guide ring 52, and will not be described in detail herein.

On the other hand, an embodiment of the present invention provides a range hood, as shown in fig. 8, the range hood may include a range hood smoke collecting hood 1, a rack main body 2, and a fan assembly 3. Wherein, the frame main body 2 can be communicated with the fume collecting hood 1 of the range hood. The fan assembly 3 is arranged in the frame main body 2, and the fan assembly 3 is used for sucking gas in the smoke collecting hood 1 of the range hood into the fan assembly 3 and discharging the gas.

Therefore, in the range hood provided by the embodiment of the invention, the smoke collecting hood 1 of the range hood is communicated with the machine frame main body 2, and the fan assembly 3 is arranged in the machine frame main body 2. Therefore, after the fan assembly 3 is started, oil smoke generated in the use process of the kitchen range can be sucked into the frame main body 2 through the smoke exhaust ventilator smoke collecting hood 1 positioned above the kitchen range and is discharged into a flue connected with the smoke exhaust ventilator.

In addition, the noise reduction part 4 can be arranged on the inner wall of the frame main body 2 and is positioned between the fan assembly 3 and the smoke exhaust ventilator hood 1, and the noise reduction part 4 is used for reducing noise entering the smoke exhaust ventilator smoke exhaust hood 1. On this basis, this range hood still includes the part 4 of making an uproar that falls that is located frame main part 2 inner wall, and should fall the part 4 of making an uproar and be located between fan subassembly 3 and range hood collection petticoat pipe 1.

So, fan subassembly 3 starts the back and is inhaled the air current to frame main part 2 through lampblack absorber collection petticoat pipe 1, on the one hand can contact with the part of making an uproar 4 that falls to under the guide effect of the part of making an uproar 4 that falls, cushion this air current, reach the purpose of making an uproar. On the other hand, because the noise reduction part 4 has a certain noise absorption function, the noise generated when the airflow from the fume collecting hood 1 of the range hood passes through the rack main body 2 and the noise generated by the airflow in the starting process of the fan assembly 3 are absorbed, and the effect of reducing the noise when the range hood is started is achieved.

As is clear from the above, the noise reduction member 4 has a certain noise absorbing function, and a specific configuration of the noise reduction member 4 having the noise absorbing function will be described below by way of example. In some embodiments of the present application, as shown in fig. 9, the noise reduction features 4 may include a housing 400 and noise reduction wool 44 of fig. 10. The housing 400 may be fastened to an inner wall of the rack main body 2 shown in fig. 1, and a noise reduction cavity may be formed between the housing 400 and the inner wall of the rack main body 2. In this case, the noise reducing cotton 44 is located in the noise reducing cavity.

The structure of the housing 400 is illustrated below, for example, in some embodiments of the present application, the housing 400 includes a plurality of first noise reduction plates 41, and the plurality of first noise reduction plates 41 are sequentially connected end to end. The first noise reduction plate 41 is provided with a through hole 411. First, whole casing 400 can be to the whole air current that gets into carry out an air current direction, and its time is first fall through-hole 411 on the board 41 of making an uproar also can be to the air current that passes through lead and shunt, fall the cotton 44 of making an uproar at last and carry out a buffering to the air current that passes through and inhale the sound and fall the noise, consequently, the first board 41 of making an uproar and fall the cotton 44 combined action of making an uproar and can improve the effect of making an uproar to the air current that gets into.

In some embodiments of the present application, since the main airflow entering directions of the fan assembly 3 only have two directions, that is, the first air inlet 311 and the second air inlet 312, which will be mentioned later, the housing 400 is respectively disposed on the inner wall of the rack main body 2 on the same side as the first air inlet 311 or the second air inlet 312, and the first noise reduction plate 41 is perpendicular to the airflow flowing direction, so that the airflow can pass through the housing 400, thereby achieving an effective noise reduction effect.

In the above description, the noise reduction component 4 includes the plurality of first noise reduction plates 41, and the plurality of first noise reduction plates 41 and the inner wall of the frame body 2 are enclosed to form the noise reduction cavity, in other embodiments of the present application, the noise reduction component 4 may include, in addition to the first noise reduction plates 41, a second noise reduction plate 42 and two third noise reduction plates 43 as shown in fig. 9.

In this case, the second noise reduction plate 42 is connected to the inner wall of the housing main body 2, the first noise reduction plate 41 is located on the side of the second noise reduction plate 42 away from the housing main body 2, and the two third noise reduction plates 43 are disposed opposite to each other and connected to the first noise reduction plate 41 and the second noise reduction plate 42. The third noise reduction plate 43 seals two ends of the noise reduction component 4 to prevent the noise reduction cotton 44 inside the noise reduction component from falling off, and the second noise reduction plate 42 is used to fix the whole noise reduction component 4 on the rack main body 2, as shown in fig. 9, in some embodiments of the present invention, the second noise reduction plate 42 may be a lifting edge with a hole, and may be fixed on the inner wall of the rack main body 2 through the lifting edge, so that the first noise reduction plate 41, the second noise reduction plate 42, and the third noise reduction plate 43 enclose an integral structure, and the stability is good.

The number of the noise reduction components 4 is not limited in the present application, and the number of the noise reduction components 4 may be plural, or may be two as shown in fig. 8, and when two noise reduction components 4 are used, the noise reduction effect may also be achieved, and the overall cost is lower compared to the case of using more than two noise reduction components 4.

In some embodiments of the present application, the noise reduction cotton 44 may be made of polyurethane foam, and the shape of the polyurethane foam is consistent with the shape of the noise reduction cavity, so that the noise reduction cotton may be completely filled in the noise reduction cavity. The cross section of the noise reduction cotton 44 can be a polygon, the cross section can be an equilateral triangle in fig. 9, if the cross section of the noise reduction cavity is in an equilateral triangle structure, the cross section is simpler compared with other polygon structures, and the manufacturing process is simpler, so the cost is lower. Because equilateral triangle's stable structure easily fixes and form effective support on the inner wall of frame main part 2, when the air current was through falling the part 4 of making an uproar, fall the cavity of making an uproar and also can stably fall and be not influenced.

Based on the above, the diameter of the through hole 411 on the first noise reduction plate 41 is 2-5 mm, and the distance between two adjacent through holes 411 is 2-5 mm. When the diameter of the through hole 411 is smaller than 2, since the diameter of the through hole is too small, when the air flow passes through, the air flow cannot smoothly pass through the noise reduction part 4, so that the air flow can forcefully impact the periphery of the through hole 411 to increase noise. When the diameter of the through hole 411 is larger than 5mm, the diameter of the through hole is too large, and at this time, when the air current passes through, although a certain noise reduction effect is formed in the rack main body 2, the effect is not particularly ideal. When the interval of two adjacent through-holes 411 is less than 2mm, because the interval undersize, consequently first board 41 of making an uproar falls plays the primary role in other words hole, and the air current passes more easily, can't effectually shunt the air current that gets into this moment, influences noise reduction effect. When the interval of two adjacent through-holes 411 is greater than 5mm, because the interval is too big, consequently the major structure of first board 41 of making an uproar plays a primary role on the board face rather, and the air current can't pass through, can only form the hindrance to the air current that gets into this moment, can't form effectual noise reduction effect.

In some embodiments of this application, the diameter of the through-hole 411 on the first board 41 of making an uproar is 2mm, 3mm or 5mm, and the interval of two adjacent through-holes 411 is for can be 2mm, 3mm or 5mm, and first board 41 of making an uproar not only can lead and shunt the air current that gets into frame main part 2 but also can guarantee the smooth and easy of air current to pass through this moment, plays noise reduction effect.

As can be seen from the above, the frame main body 2 is used for accommodating the noise reduction structure, and in order to express the structure of the frame main body 2 more clearly, the structure of the frame main body 2 is illustrated below, for example, in the present application, referring to fig. 11, the frame main body 2 in the present application includes a frame front plate 21, a frame cover plate 22, a frame enclosure plate 23, and a frame top plate 24, where the frame front plate 21 and the frame enclosure plate 23 are connected to form a frame cavity, the frame top plate 24 is disposed at one end of the frame cavity, and the frame cover plate 22 is disposed on the frame front plate 21.

In some embodiments of the present application, the range hood may further include an air outlet hood assembly 6, and the direction of the air outlet of the volute 31 and the direction of the air flow at the outlet of the air hood assembly 6 are kept one to make the oil smoke circulate more smoothly, so as to reduce the noise at the air outlet of the volute 31.

In summary, the range hood of the present application may include a noise reduction component 4, an intake air guide hood 5, a first guide inclined surface 3141, a second guide inclined surface 3151, and the like, and the above structure is further described with reference to the embodiments.

Based on above-mentioned basis, referring to fig. 12, the arrow direction is oil smoke flow direction, starter motor 32, and impeller 33 on the motor rotates, collects the oil smoke through lampblack absorber collection petticoat pipe 1 this moment, and the oil smoke gets into through the bottom of frame main part 2, and the part 4 of making an uproar falls earlier in the process, should fall the part 4 of making an uproar and lead to the air current of air inlet on the one hand, and on the other hand can absorb the noise in the frame main part 2. Then the oil smoke is sucked into the volute casing 31 through the first air inlet 311 and the second air inlet 312, the air inlet guide cover 5 at the first air inlet 311 diffuses noise generated by airflow, and the second air inlet 312 is provided with an arc-shaped bulge, so that the air inlet area is increased, and the noise of the whole machine can be greatly reduced. A part of the oil smoke entering the scroll 31 enters the bottom of the scroll 31, and the first guiding inclined surface 3141 and the second guiding inclined surface 3151 form a transition section for the oil smoke path to reduce the collision of the airflow to the bottom of the scroll 31, thereby reducing the noise. Finally, the oil smoke in the volute 31 is discharged through the air outlet of the volute 31, in the application, the noise reduction treatment is carried out on the path through which the oil smoke passes, the collision strength of the oil smoke on the range hood is also improved, the noise is effectively reduced, and the service life of the range hood is prolonged.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A fan assembly is characterized by comprising a volute (31), and a motor (32) and an impeller (33) which are positioned in the volute (31), wherein the output end of the motor (32) is connected with the impeller (33), and the impeller (33) is of a double-layer structure;

first air intake (311) have been seted up on spiral case (31), fan subassembly (3) still include air inlet guide cover (5), install in first air intake department (311), air inlet guide cover (5) include network structure (51) and enclose and locate network structure peripheral direction circle (52), network structure (51) cover first air intake (311).

2. A fan assembly according to claim 1, wherein the surface of the guide ring (52) remote from the volute (31) is formed as an arcuate projection.

3. A fan assembly according to claim 1, wherein the web structure (51) comprises a plurality of spokes (511) and a ring (512) connecting the plurality of spokes (511) together to form a three-dimensional cone.

4. A fan assembly according to claim 1, wherein the volute (31) comprises:

a volute enclosure (313);

a volute front plate (314), wherein one side of the volute front plate (314), which is close to the range hood smoke collecting cover (1), is provided with a first guide inclined plane (3141);

the volute back plate (315) is connected with the volute surrounding plate (313) and is arranged opposite to the volute front plate (314), and the volute front plate (314), the volute surrounding plate (313) and the volute back plate (315) are connected and enclosed to form a volute cavity for accommodating the motor (32); one side of the volute rear plate (315) close to the smoke collecting hood (1) of the range hood is provided with a second guide inclined plane (3151);

the included angle between the first guide inclined surface (3141) and the second guide inclined surface (3151) and the volute enclosing plate (313) is an acute angle.

5. The fan assembly according to claim 4, wherein the volute (31) is provided with a second air inlet (312) opposite to the first air inlet (311);

the volute casing back plate (315) further comprises a convex ring (3121) which is arranged around the second air inlet (312), and an arc-shaped bulge is formed on the surface of the convex ring (3121) far away from the volute casing (31).

6. A range hood, characterized by comprising a fan assembly (3) according to any one of claims 1 to 5, the range hood further comprising:

a fume collecting hood (1) of the range hood;

frame main part (2), with lampblack absorber collection petticoat pipe (1) is linked together, fan subassembly (3) set up in frame main part (2), be used for with gas in lampblack absorber collection petticoat pipe (1) is inhaled in fan subassembly (3) and is got rid of.

7. The range hood of claim 6, further comprising;

the noise reduction part (4) is arranged on the inner wall of the rack main body (2) and located between the fan assembly (3) and the smoke exhaust ventilator smoke collection hood (1), and the noise reduction part (4) is used for reducing and entering noise in the rack main body (2).

8. A range hood according to claim 7, characterized in that the noise reduction member (4) comprises:

the noise reduction device comprises a shell (400) which is buckled on the inner wall of the rack main body (2), a noise reduction cavity is formed between the shell and the inner wall of the rack main body (2), the shell (400) comprises a plurality of first noise reduction plates (41), the first noise reduction plates (41) are sequentially connected in an end-to-end mode, and through holes (411) are formed in the first noise reduction plates (41); and the number of the first and second groups,

noise reducing cotton (44), the noise reducing cotton (44) is located in the noise reducing cavity.

9. A range hood according to claim 8, wherein the noise reduction features (4) further comprise a second noise reduction plate (42), and two third noise reduction plates (43);

the second noise reduction plate (42) is connected with the inner wall of the rack main body (2), the first noise reduction plate (41) is located on one side, away from the rack main body (2), of the second noise reduction plate (42), the two third noise reduction plates (43) are oppositely arranged and connected with the first noise reduction plate (41) and the second noise reduction plate (42).

10. The range hood according to claim 8, wherein the diameter of the through holes (411) is 2-5 mm, and the distance between two adjacent through holes (411) is 2-5 mm.