CN109340193B

CN109340193B - Diversion air channel, airflow driving piece and range hood

Info

Publication number: CN109340193B
Application number: CN201811130759.6A
Authority: CN
Inventors: 张薇
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2018-09-27
Filing date: 2018-09-27
Publication date: 2020-09-01
Anticipated expiration: 2038-09-27
Also published as: CN109340193A

Abstract

The invention discloses a diversion air duct, an air flow driving piece and a range hood, wherein the diversion air duct comprises: the air duct comprises an air duct main body and a silencer. The air duct main body is provided with an air inlet; at least one part of the silencer is arranged at the air inlet of the air duct main body, the silencer comprises a silencing structure, and the silencing structure is arranged at least one of the position and the middle position of the periphery of the air inlet of the air duct main body. According to the guide air duct provided by the embodiment of the invention, the noise reduction effect can be improved.

Description

Diversion air channel, airflow driving piece and range hood

Technical Field

The invention relates to the technical field of air treatment, in particular to a guide air duct, an airflow driving piece with the guide air duct and a range hood with the airflow driving piece.

Background

The range hood is a necessary household electrical appliance, but the range hood can generate large noise in the process, and the use comfort of a user is seriously influenced. In the related art, a plurality of silencing structures are applied to the range hood, and the silencing structures are generally designed at the outlet of the air outlet cover of the range hood to achieve the silencing purpose. However, noise reduction of the outlet cannot reduce the noise of the flue gas on other flow paths, and the noise reduction is provided at the outlet, and the noise may be amplified before reaching the outlet, thereby causing a relatively large noise.

Disclosure of Invention

One objective of the present invention is to provide a flow guiding duct, which can improve the noise reduction effect.

The second objective of the present invention is to provide an airflow driving member with the diversion air duct.

The third purpose of the invention is to provide a range hood with the airflow driving part.

According to the air guide duct of the embodiment of the invention, the air guide duct comprises: the air duct comprises an air duct main body and a silencer. The air duct main body is provided with an air inlet; at least one part of the silencer is arranged at the air inlet of the air duct main body, the silencer comprises a silencing structure, and the silencing structure is arranged at least one of the position and the middle position of the periphery of the air inlet of the air duct main body.

According to the guide air duct provided by the embodiment of the invention, the noise reduction effect can be improved.

In addition, the guide air duct according to the above embodiment of the present invention may further have the following additional technical features:

in some embodiments, one or more cavities are formed in the silencing structure, and a silencing hole is formed in a side wall of the silencing structure facing the inner space of the diversion air duct, and the silencing hole is communicated with the inner space and the outer space of the silencing structure.

In some embodiments, a baffle is disposed within the sound attenuating structure, the baffle partitioning a plurality of cavities within the sound attenuating structure.

In some embodiments, the aperture of the sound deadening hole is 0.5 mm; and/or the hole spacing of the silencing holes is 3.77 mm; and/or the perforation rate of the silencing holes on the corresponding side wall of the silencing structure is 1.38%; and/or the depth of the cavity is 20 mm.

In some embodiments, the sound attenuating structure is internally empty or filled with sound attenuating material.

In some embodiments, the silencer includes a first silencing structure disposed at a peripheral edge of the air inlet, the first silencing structure is disposed along the peripheral edge of the air inlet, and in a projection along an axial direction of the air inlet, the first silencing structure extends into the air inlet.

In some embodiments, the first sound attenuating structure is in the shape of a circular ring extending along the periphery of the air inlet.

In some embodiments, the first silencing structure includes a plurality of silencing portions and a plurality of connecting portions, the plurality of silencing portions are sequentially arranged along the periphery of the air inlet, and the plurality of silencing portions are connected together by the connecting portions, and the connecting portions are connected to the air duct main body.

In some embodiments, at least one cavity is formed in the silencing part, and a silencing hole is formed on the inner side surface of the silencing part.

In some embodiments, the silencer includes a second silencing structure disposed at an intermediate location of the inlet vent.

In some embodiments, the inner side surface of the second sound deadening structure has a shape in which the middle part is convex toward the inner space of the guide duct; or the inner side surface of the second silencing structure is in a smooth arc surface shape which gradually protrudes towards the inner space of the diversion air duct from the periphery to the center.

In some embodiments, the second sound attenuating structure includes an inner sidewall, an outer sidewall, and a peripheral wall, the inner sidewall and the outer sidewall being spaced apart, the peripheral wall being connected to a peripheral edge of the inner sidewall and a peripheral edge of the outer sidewall, respectively, to form a hollow chamber.

In some embodiments, a projection of the second sound attenuating structure along a central axis of the air inlet is circular.

In some embodiments, the silencer includes a first silencing structure disposed at a peripheral edge of the air inlet and a second silencing structure disposed at an intermediate position of the air inlet, the first silencing structure is disposed around the second silencing structure, and a gap is formed between the first silencing structure and the second silencing structure.

In some embodiments, the first sound attenuating structure and the second sound attenuating structure are spaced apart, and the muffler further includes a stem connected to the first sound attenuating structure and the second sound attenuating structure, respectively.

In some embodiments, the duct body is a volute.

An airflow actuator according to an embodiment of the invention comprises: the wind guide device comprises a guide air channel, a wind wheel and a driving piece, wherein the guide air channel is formed according to the guide air channel; the wind wheel can be rotatably arranged in the diversion air duct; the driving piece is fixed with the relative position of the diversion air duct, and the driving piece is connected with the wind wheel to drive the wind wheel to rotate.

In some embodiments, the silencer includes a second silencing structure disposed at a middle position of the air inlet, and a joint of the second silencing structure and the driving member and a joint of the driving member and the wind wheel are opposite and spaced by 5mm to 8 mm.

According to the embodiment of the invention, the range hood comprises: the cigarette making machine comprises a shell and an airflow driving piece, wherein the shell is provided with a cigarette inlet and a cigarette outlet; the airflow driving part is arranged in the shell and positioned between the smoke inlet and the smoke outlet, and the airflow driving part is the airflow driving part.

Drawings

Fig. 1 is a schematic view of a range hood according to an embodiment of the present invention.

Fig. 2 is a schematic view of a range hood according to an embodiment of the present invention.

Fig. 3 is a schematic view of a muffler in a range hood according to an embodiment of the present invention in one direction.

Fig. 4 is a schematic view of a muffler in a range hood according to an embodiment of the present invention in another direction.

Fig. 5-7 are cross-sectional views of silencers of various embodiments of the present invention.

Reference numerals:

range hood 100

A shell 1, a smoke inlet 101, a smoke outlet 102,

the air flow driving member 2 is provided with a plurality of air flow driving members,

the air guide duct 21, the air inlet 201,

the air duct main body 211 is formed with,

a silencer 212, a silencing hole 202, a first silencing structure 2121, a ring cavity inner side 2101, a ring cavity outer side 2102, a ring cavity front side 2103, a ring cavity rear side 2104, a resonance chamber 2105, a silencing part 2111, a connecting part 2112, a second silencing structure 2122, an outer side 2106, an inner side 2107, a peripheral wall 2108, a connecting handle 2123, a connecting screw 2109, a partition 2110, a connecting hole 2113,

the wind wheel 22 is provided with a wind-guiding vane,

and the driving piece 23 is connected with the screw 231.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1, according to an embodiment of the air guide duct 21 of the present invention, the air guide duct 21 includes: a duct main body 211 and a silencer 212.

The air duct main body 211 has an air inlet 201, and the air flow can enter the air duct main body 211 from the air inlet 201 of the air duct main body 211. At least a part of the silencer 212 is disposed at the air inlet 201 of the air duct main body 211, and the air flow entering the air duct main body 211 from the outside will be silenced when passing through the silencer 212. The silencer 212 includes a silencing structure, and the silencing structure is provided at least one of a circumferential position and a middle position of the air inlet 201 of the air duct main body 211.

According to the guide air duct 21 provided by the embodiment of the invention, the noise reduction effect can be improved.

The silencing structure disposed at the peripheral position of the air inlet 201 can silence the air flow. Because the most important position for generating turbulence in the air flow is at the edge of the air flow, and the air flow at the edge is more easily influenced by other factors, so as to generate noise, the noise reduction structure is arranged at the peripheral position of the air inlet 201 in the invention, so that the noise of the air flow can be effectively reduced. In addition, the silencing structure arranged in the middle of the air inlet 201 can also carry out silencing to a certain extent, and further, under the general condition, the impeller is arranged in the air duct main body 211 and can be driven by the motor, and the connecting position of the motor and the impeller generally corresponds to the middle of the air inlet 201, so that the silencing structure arranged in the middle of the air inlet 201 can reduce the noise generated by the motor, thereby effectively reducing the whole noise of the guide air duct 21, and particularly has better silencing effect when the guide air duct 21 is applied to structures such as a smoke machine and a centrifugal fan.

According to the guide air duct 21 provided by the embodiment of the invention, due to the arrangement of the silencer 212, in the process that the smoke passes through the silencer 212, the noise generated in the smoke circulation process can be eliminated, so that the purposes of silencing and reducing noise are achieved, and the smoke machine runs in a relatively silent environment and is provided for a good running environment.

In addition, in the present invention, the silencer 212 is disposed at the air inlet 201 of the guide air duct 21, so that the air flow at the air inlet 201 can be silenced and denoised, that is, the air flow is silenced and denoised when entering the guide air duct 21, at this time, even if the air flow generates noise during the circulation process in the guide air duct 21, the newly generated noise is relatively small, and is not the superposition of the original noise, the whole noise of the guide air duct 21 is effectively controlled, and the highest noise of the guide air duct 21 can be effectively reduced.

The noise reduction structure of the present invention may have various forms, for example, noise reduction by a sponge or the like can effectively reduce noise. In addition, other noise reducing structures may be used, such as perforated plates and the like. The present invention will be described mainly by taking the use of orifice plate silencing as an example.

In some embodiments of the present invention, as shown in fig. 5-7, one or more cavities are formed in the silencing structure, and silencing holes 202 are formed on the side wall of the silencing structure facing the inner space of the air guide duct 21, and the silencing holes 202 communicate the inner space and the outer space of the silencing structure. When the air flow passes through the air inlet 201, partial noise reduction in the air flow circulation process is eliminated, so that noise reduction can be effectively realized.

When the airflow enters the smoke inlet 101 through the silencing structure, the airflow will pass through the silencing structure, and a part of the airflow passing through the silencing structure enters a larger space (a cavity in the silencing structure) after passing through the silencing hole 202, so that the volume of the smoke is increased, and the energy of the airflow is weakened by the expansion of the gas, thereby reducing the noise.

Further, with reference to fig. 6 and 7, a partition 2110 is disposed in the sound attenuating structure, and the partition 2110 partitions a plurality of cavities in the sound attenuating structure. The plurality of cavities can effectively isolate the air flow and reduce the generation of turbulent flow, and in addition, the partition board 2110 can be provided with through holes.

Preferably, the aperture of the muffling hole 202 is 0.5 millimeters. The aperture of the muffling hole 202 is preferably in the range of 0.1 mm to 5mm, for example, the aperture of the muffling hole 202 is set to 0.1 mm, 0.3 mm, 1.6 mm, 4.8 mm, or the like, and the aperture of the muffling hole 202 is not limited thereto, and the aperture of the muffling hole 202 may be set to less than 0.1 mm or more than 5mm, for example, the aperture of the muffling hole 202 is set to 0.05 mm, 15 mm, or the like.

In the present invention, the through hole (the muffling hole 202) in the wall in which the muffling hole 202 is provided may have a non-circular shape, and the maximum width of the muffling hole 202 may be set to be within 2 mm.

Further, the hole pitch of the muffling holes 202 is 3.77 mm. That is, the hole pitch of the adjacent two muffling holes 202 is 3.77 mm. Alternatively, another aspect may be described, for example, where the number of muffling holes 202 per square millimeter is in the range of 0.02 to 2. That is, the number of acoustic holes 202 ranges from 2 to 200 per 100 square millimeters.

Preferably, the perforation rate of the silencing structure corresponding to the silencing holes 202 on the side wall is 1.38%, that is, the ratio of the total area of the silencing holes 202 to the area of the side wall on the side wall with the silencing holes 202 is 1.38%, of course, setting the perforation rate to 1.38% is only a specific example of the present invention, and the perforation rate can also be set to be in the range of 1% to 5%, and the setting can be performed according to actual requirements, so that the noise reduction and silencing effects are effectively improved.

Further, the depth of the cavity was 20 mm. The depth of the cavity refers to a dimension in the cavity along a direction parallel to the axis of the air inlet 201, and of course, the depth of the cavity being 20mm is only a specific example of the present invention, and the depth of the cavity may also be set in a range from 5mm to 100 mm in the present invention, for example, the depth of the cavity is set to 7mm, 23 mm, 45 mm, or 72 mm, etc. Of course, the depth of the cavity may be less than 5mm or greater than 100 mm, and the above description of the present invention should not be construed as limiting the scope of the present invention.

In the present invention, the thickness of the side wall (sound-deadening plate) of the sound-deadening structure in which the sound-deadening holes 202 are provided is within 2 mm. The reasonable arrangement of the thickness of the silencing plate, the perforation rate of the silencing plate and the perforation hole diameter on the silencing plate has a remarkable promoting effect on silencing and noise reduction of the invention, the description of the dimensional relationship is only a specific embodiment of the invention and is not a limitation on the protection scope of the invention, for example, the perforation rate of the silencing plate can be set within the range of less than 1% or more than 5%; the aperture of the perforations of the sound-absorbing plate can also be set to be larger than 2 mm; the thickness of the noise reduction plate may be set to be greater than 2 mm.

In some embodiments, the silencing structure is hollow, so that the hole plate structure can be used for silencing, and the silencing effect is good.

In addition, the sound deadening effect of the sound deadening structure can be further improved, for example, by filling the sound deadening structure with a sound deadening material or the like, and by filling the sound deadening structure with a sound deadening material, the sound deadening effect of the sound deadening structure can be further improved.

The sound-deadening structure may be disposed at any one of the peripheral position and the middle position of the air inlet 201, and the sound-deadening structure disposed at any position may have the above-mentioned features, for example, any one of the sound-deadening structures may be a perforated plate structure.

The present invention will be described in detail with respect to various embodiments of the muffler 212.

Referring to fig. 1 to 7, in some embodiments, the silencer 212 includes a first silencing structure 2121 disposed along a peripheral edge of the inlet 201, and the first silencing structure 2121 is disposed along the peripheral edge of the inlet 201.

Because the most important position for generating turbulence in the air flow is at the edge of the air flow, and the air flow at the edge is more easily influenced by other factors, so as to generate noise, the noise reduction structure is arranged at the peripheral position of the air inlet 201 in the invention, so that the noise of the air flow can be effectively reduced. In addition, the silencing structure arranged in the middle of the air inlet 201 can also carry out silencing to a certain extent

Preferably, the first silencing structure 2121 extends into the air inlet 201 in a projection along the axial direction of the air inlet 201. That is, the air flow inevitably passes through the first silencing structure 2121 when entering the air inlet 201, so that the silencing can be effectively performed, and it should be noted that the first silencing structure 2121 may be disposed such that the inner peripheral edge is flush with the inner peripheral edge of the air inlet 201.

Further, referring to fig. 1, the first silencing structure 2121 has a circular ring shape extending along the circumference of the air inlet 201. When the airflow enters the air inlet 201 along the periphery of the air inlet 201, the airflow passes through the first silencing structure 2121, so that the silencing effect can be effectively improved.

Advantageously, with reference to fig. 3 to 7, the first silencing structure 2121 includes a plurality of silencing portions 2111 and a plurality of connecting portions 2112, the plurality of silencing portions 2111 are sequentially arranged along the periphery of the air inlet 201, and the plurality of silencing portions 2111 are connected together by the connecting portions 2112, the connecting portions 2112 being connected to the duct main body 211. In the present invention, the connecting portion 2112 is disposed between the plurality of muffling portions 2111, so that not only the plurality of muffling portions 2111 can be connected together through the connecting portion 2112 to connect the first muffling structure 2121 as a whole, but also the first muffling structure 2121 can be mounted on the air duct main body 211 through the connecting portion 2112, thereby effectively improving the stability of connection between the first muffling structure 2121 and the air duct main body 211 and improving the connection strength.

Of course, the silencing portion 2111 may be provided in a ring shape, and the connecting portion 2112 may be provided on the outer or inner periphery of the silencing portion 2111 to attach the first silencing structure 2121 to the duct main body 211. Further, a sound deadening portion 2111 may be provided, the sound deadening portion 2111 may have a ring shape having a notch, and a connecting portion 2112 may be provided at the notch.

Advantageously, at least one cavity is formed in the silencer 2111, and a silencer hole 202 is provided on the inner side surface of the silencer 2111. The first noise attenuating structure 2121 in fact has a plurality of individual noise attenuating portions 2111, which reduce interference therebetween, thereby serving the purpose of further attenuating noise.

In addition, referring to fig. 1 to 7, in another embodiment of the present invention, the silencer 212 includes a second silencing structure 2122 disposed at a middle position of the intake vent 201. When the air flow enters the air duct main body 211 through the air inlet 201, the backflow of the air flow is blocked by the second silencing structure 2122, so that the noise can be reduced, and the backflow air flow can also be silenced by the second silencing structure 2122, and in addition, the noise generated by driving parts such as a motor and the like can also be blocked by the second silencing structure 2122, so that the silencing effect is further improved.

Preferably, the inner side surface of the second silencing structure 2122 has a shape with a middle portion protruding toward the inner space of the guide duct 21.

Further, the inner side surface of the second silencing structure 2122 is a smooth arc surface gradually protruding from the periphery to the center toward the inner space of the air guide duct 21. The smooth cambered surface can facilitate the circulation of air flow and improve the air circulation efficiency.

Preferably, with reference to fig. 3 and 4, second sound attenuating structure 2122 includes an inner sidewall 2107, an outer sidewall 2106, and a peripheral wall 2108, inner sidewall 2107 and outer sidewall 2106 being spaced apart, peripheral wall 2108 being connected to a peripheral edge of inner sidewall 2107 and a peripheral edge of outer sidewall 2106, respectively, to form a hollow chamber. The chamber formed in the second sound attenuating structure 2122 can further enhance the sound attenuating effect of the second sound attenuating structure 2122.

Further, the projection of the second silencing structure 2122 along the central axis of the air inlet 201 is circular. Of course, the projection of the second silencing structure 2122 may also be a polygon, an ellipse, or other regular or irregular shapes, and also has a certain silencing structure, which does not affect the embodiment of the present application.

Referring to fig. 1 to 7, in some embodiments of the invention, the silencer 212 includes a first silencing structure 2121 disposed at a peripheral edge of the inlet 201 and a second silencing structure 2122 disposed at a middle position of the inlet 201, and the first silencing structure 2121 is disposed around the second silencing structure 2122. Both the first silencing structure 2121 and the second silencing structure 2122 can adopt the above structure, and have the advantages brought by the first silencing structure 2121 and the second silencing structure 2122. In addition, the combination of the first silencing structure 2121 and the second silencing structure 2122 can improve the flow guiding effect on the air flow, and such flow guiding can further improve the silencing and noise reduction effects.

In addition, there is a gap between first sound attenuating structure 2121 and second sound attenuating structure 2122.

Advantageously, with reference to fig. 1-7, the first and second

sound attenuating structures

2121 and 2122 are spaced apart, and the muffler 212 further includes a stem 2123, the stem 2123 being connected to the first and second

sound attenuating structures

2121 and 2122, respectively. The first and second

sound attenuating structures

2121 and 2122 are joined together by a stem 2123, and the first and second

sound attenuating structures

2121 and 2122 are combined as a single unit to simplify assembly.

As in the previous embodiment, the first sound attenuating structure 2121 can be mounted to the duct body 211 via the connecting portion 2112 of the first sound attenuating structure 2121, and similarly, since the second sound attenuating structure 2122 is connected to the first sound attenuating structure 2121 via the connecting portion 2123, the first sound attenuating structure 2121 and the second sound attenuating structure 2122 can be mounted via the connecting portion 2112 of the second sound attenuating structure 2122.

In some embodiments of the present invention, in conjunction with fig. 1 and 2, the duct body 211 is a volute. Of course, the duct main body 211 may have another structure depending on the actual use environment.

Referring to fig. 1, an airflow actuator 2 according to an embodiment of the present invention includes: a diversion air duct 21, a wind wheel and a driving piece.

The guide air duct 21 is the guide air duct 21 described above. The wind wheel can be rotationally arranged in the guide air duct 21, and the wind wheel can drive airflow through rotation. The driving member is fixed relative to the diversion air duct 21, and the driving member is connected with the wind wheel to drive the wind wheel to rotate.

According to the air flow driving member 2 of the embodiment of the present invention, due to the arrangement of the guide air duct 21, the air flow can be silenced and guided, and the noise of the air flow driving member 2 can be effectively reduced.

In some embodiments, the silencer 212 includes a second silencing structure 2122 disposed at a middle position of the air inlet 201, and the second silencing structure 2122 is opposite to and spaced apart from the connection between the driving member and the wind wheel by 5mm to 8 mm.

As shown in fig. 1 and 2, a range hood 100 according to an embodiment of the present invention includes: a housing 1 and an airflow driving part 2, wherein the housing 1 is provided with a smoke inlet 101 and a smoke outlet 102; the airflow driving member 2 is disposed in the housing 1 and located between the smoke inlet 101 and the smoke outlet 102, and the airflow driving member 2 is the airflow driving member 2 according to the foregoing description.

The silencer is arranged at the air inlet 201 of the air duct main body 211, so that the requirement of reducing noise is met, and the comfort in the use process is improved. According to the range hood 100 at the home installation position of the user, the silencer is installed at the air inlet 201, and the noise reduction effect experienced by the user is better.

In the embodiment of the present invention, a silencing structure is disposed at the air inlet 201. The silencer provided by the invention not only can well eliminate the noise of the motor, but also can eliminate the noise near the channel of the air inlet 201, and has a certain flow guide effect.

Fig. 3 and 4 are schematic diagrams of the silencer structure of the air inlet 201, fig. 3 is a side of the silencer far from the fan, fig. 4 is a side of the silencer near the fan, the silencer includes a silencing annular cavity (a first silencing structure 2121) and a middle silencing cavity (a second silencing structure 2122), the two silencing annular cavities are connected into a whole through a connecting handle 2123, and two connecting hole sites 2113 are arranged on the silencing annular cavity and used for mounting the silencer 1 and the fan 4 at the air inlet 201. The first silencing structure 2121 is formed by connecting an inner ring cavity side surface 2101, an outer ring cavity side surface 2102, a front ring cavity side surface 2103 and a rear ring cavity side surface 2104, and a silencing hole 202 is formed in the inner ring cavity side surface 2101. The second silencing structure 2122 is composed of an outer side wall 2106, an inner side wall 2107 and a peripheral wall 2108, and a silencing hole 202 is provided on the inner side wall 2107. The perforation parameters of the first sound attenuating structure 2121 and the second sound attenuating structure 2122 can be kept consistent as follows: the aperture is 0.5mm, the hole spacing is 3.77mm, the perforation rate is 1.38%, and the depth of the anechoic cavity is 20 mm.

Fig. 5 is a cross-sectional view of a sound-damping annulus, where the first sound-damping structure 2121 is formed by two single-sided annulus chambers, and the single annulus has only one resonant chamber.

Fig. 1 is a schematic view of the silencer at the air inlet 201, and the silencer is connected with a volute on a fan through a connecting screw 2109. Fig. 2 is a sectional view of the muffler at the air inlet 201, the center of the second silencing structure 2122 is aligned with the center of the motor, and the distance between the front end of the protrusion of the second silencing structure 2122 and the connection screw 231 is 5-8 mm.

The diameter of the first silencing structure 2121 is slightly smaller than that of the air inlet 201, and is used for eliminating noise around the air inlet 201; the second silencing structure 2122 is perforated at the curved surface close to the fan, so that the noise transmitted by the motor is absorbed while the flow is guided.

Fig. 6 and 7 are alternatives, and more resonant chambers 2105 are added at the first sound-deadening structure 2121, the more the chambers are, the better the sound-deadening effect is, the single-side ring cavity of fig. 6 has 5 resonant chambers 2105, and the total ring cavity has 10 chambers; the single-sided ring cavity of fig. 7 has 10 resonant chambers 2105, and the entire ring cavity has 20 chambers.

In the invention, the noise near the air inlet 201 channel, the noise transmitted by the motor and the flow guide effect at the air inlet 201 are eliminated; the noise elimination structure at the air inlet 201 can be provided with resonance chambers 2105, the number of the resonance chambers 2105 rotates according to the use condition, and the noise elimination effect can be improved by increasing or reducing the number of the resonance chambers 2105. The inner side wall 2107 of the second silencing structure 2122 is perforated to eliminate the noise of the air duct

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A guide air duct, comprising:

the air duct main body is provided with an air inlet;

the silencer is arranged at the air inlet of the air duct main body, at least one part of the silencer comprises a silencing structure, the silencing structure is arranged at the peripheral position and the middle position of the air inlet of the air duct main body,

the silencer comprises a first silencing structure and a second silencing structure, wherein the first silencing structure is arranged on the periphery of the air inlet, the second silencing structure is arranged in the middle of the air inlet, the first silencing structure is arranged on the periphery of the air inlet, the first silencing structure extends into the air inlet in the projection of the axis direction of the air inlet, and the middle of the inner side of the second silencing structure faces towards the convex shape of the inner space of the flow guide air channel.

2. The air guide duct according to claim 1, wherein the silencing structure has one or more cavities therein, and a silencing hole is provided on a side wall of the silencing structure facing the inner space of the air guide duct, and the silencing hole communicates with the inner space and the outer space of the silencing structure.

3. The air guide duct according to claim 2, wherein a partition is disposed in the sound-deadening structure, and the partition partitions a plurality of cavities in the sound-deadening structure.

4. Guide duct according to claim 2,

the aperture of the silencing hole is 0.5 mm; and/or

The hole spacing of the silencing holes is 3.77 mm; and/or

The perforation rate of the silencing holes on the corresponding side wall of the silencing structure is 1.38%; and/or

The depth of the cavity is 20 mm.

5. The air guide duct of claim 1, wherein the silencing structure is hollow or filled with silencing material.

6. The wind guide duct of claim 1, wherein the first noise reduction structure is in the shape of a circular ring extending along the periphery of the wind inlet.

7. The air guide duct according to claim 1, wherein the first silencing structure comprises a plurality of silencing portions and a plurality of connecting portions, the plurality of silencing portions are sequentially arranged along a circumferential edge of the air inlet, the plurality of silencing portions are connected together by the connecting portions, and the connecting portions are connected with the duct main body.

8. The air guide duct according to claim 7, wherein at least one cavity is formed in the muffling portion, and a muffling hole is formed on an inner side surface of the muffling portion.

9. The air guide duct according to claim 1, wherein the inner side surface of the second sound-deadening structure is a smooth arc surface that gradually protrudes from the periphery to the center toward the inner space of the air guide duct.

10. The guide duct of claim 1, wherein the second noise reduction structure comprises an inner side wall, an outer side wall and a peripheral wall, the inner side wall and the outer side wall are spaced apart, and the peripheral wall is respectively connected with the peripheral edge of the inner side wall and the peripheral edge of the outer side wall to form a hollow chamber.

11. The wind guide duct of claim 1, wherein the projection of the second noise reduction structure along the central axis of the wind inlet is circular.

12. The guide duct according to any one of claims 1 to 5, wherein the first sound deadening structure is disposed around the second sound deadening structure with a gap therebetween.

13. The guide duct of claim 1, wherein the first and second sound attenuating structures are spaced apart, and the silencer further comprises a connecting handle connected to the first and second sound attenuating structures, respectively.

14. The guide duct of claim 1, wherein the duct body is a volute.

15. An airflow actuator, comprising:

a guide air duct according to any one of claims 1 to 14;

the wind wheel can be rotatably arranged in the diversion air duct;

the driving piece is fixed with the relative position of the diversion air channel, and the driving piece is connected with the wind wheel to drive the wind wheel to rotate.

16. An airflow actuator according to claim 15 wherein the second sound attenuating formation is spaced from and directly opposite the junction of the actuator and the rotor by 5mm to 8 mm.

17. A range hood, comprising:

a housing having a smoke inlet and a smoke outlet;

an airflow driving member disposed in the housing and located between the smoke inlet and the smoke outlet, the airflow driving member being according to claim 15 or 16.