CN114076335A

CN114076335A - Oil fume suction device

Info

Publication number: CN114076335A
Application number: CN202010846667.9A
Authority: CN
Inventors: 边乐超; 李伟
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2020-08-20
Filing date: 2020-08-20
Publication date: 2022-02-22
Anticipated expiration: 2040-08-20
Also published as: CN114076335B

Abstract

The invention discloses a lampblack absorbing device, which comprises: the noise reduction air duct piece is internally provided with a smoke passage, the smoke passage forms at least part of an oil smoke suction air duct of the oil smoke suction equipment, the smoke passage is provided with a plurality of noise reduction cavities which are not communicated with each other, the noise reduction cavities are provided with noise reduction micropores communicated with the smoke passage, the depth of the cavities of at least two noise reduction cavities and/or the perforation rate of the noise reduction micropores are different, and the noise reduction frequency bands of the two noise reduction cavities are different. The technical scheme of the invention can reduce the operation noise of the oil fume suction equipment.

Description

Oil fume suction device

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a fume suction device.

Background

For the oil fume suction device, it is usually provided with an oil fume suction duct communicating the oil fume inlet and the smoke outlet, and a smoke exhaust fan is arranged in the oil fume suction duct. The smoke inlet is communicated with the indoor space, the smoke outlet is communicated with the outdoor space, and oil smoke generated by cooking in a kitchen enters from the smoke inlet and is exhausted outdoors from the smoke outlet through the oil smoke suction air duct. The noise generated by the oil fume suction device during operation (including the noise generated by the exhaust fan and the noise generated by the vortex at the inner corner of the oil fume suction device) is transmitted to the human ear through the smoke inlet, and the frequency band of the noise is wide.

Disclosure of Invention

The main object of the present invention is to propose a cooking fume extractor device aimed at reducing the operating noise of the same.

In order to achieve the above object, the present invention provides a range hood device comprising:

the noise reduction air duct piece is internally provided with a smoke passage, the smoke passage forms at least part of an oil smoke suction air duct of the oil smoke suction equipment, the smoke passage is provided with a plurality of noise reduction cavities which are not communicated with each other, the noise reduction cavities are provided with noise reduction micropores communicated with the smoke passage, the depth of the cavities of at least two noise reduction cavities and/or the perforation rate of the noise reduction micropores are different, and the noise reduction frequency bands of the two noise reduction cavities are different.

Therefore, noise of different frequency bands inside the oil fume suction equipment can be reduced through the noise reduction cavities with different noise reduction frequency bands, so that noise reduction of a wide frequency band is realized, and operation noise of the oil fume suction equipment is reduced.

Optionally, the noise reduction frequency bands of the plurality of noise reduction cavities are different from each other, so that noise reduction is performed on noise in multiple frequency bands as many as possible, and the noise reduction frequency band width of the range hood device is increased.

Optionally, it includes the collection petticoat pipe to fall the wind channel spare of making an uproar, collection petticoat pipe be equipped with into the mouth of cigarette and with the air inlet duct of advancing the mouth of cigarette intercommunication, cross the cigarette wind duct and include the air inlet duct, so, at this oil absorption cigarette equipment operation's in-process, its inside noise energy passes through fall the chamber of making an uproar on the air inlet duct and fall the noise.

Optionally, the range hood device further includes a cavity structure mounted on the air duct wall of the air inlet duct, and the plurality of noise reduction cavities are disposed in the cavity structure; therefore, a plurality of noise reduction cavities can be formed under the condition that the air duct wall of the air inlet duct is not changed.

Optionally, the cavity structure includes a microporous wall spaced apart from the air duct wall, an enclosure wall connecting the periphery of the microporous wall, and a plurality of partition walls disposed in the enclosure wall and spaced apart between the air duct wall and the microporous wall to partition the space between the air duct wall and the microporous wall into a plurality of noise reduction cavities; thus, a plurality of noise reduction cavities can be formed on the air duct wall only by one-time installation.

Optionally, a plurality of the partition walls are arranged at intervals in the transverse direction to partition the space between the air duct wall and the microporous wall into a plurality of the noise reduction chambers arranged at intervals in the transverse direction.

Optionally, the microporous wall has a plurality of microporous regions corresponding to the noise reduction cavities one to one, the depths of the noise reduction cavities are consistent, and the perforation rates of the microporous regions of different noise reduction cavities with different noise reduction frequency bands are different.

Therefore, the outer surface of the microporous wall is smooth, so that a step-shaped structure which is easy to cause eddy can be prevented from being formed on the outer surface of the microporous wall, eddy noise is prevented from being generated, and meanwhile, the oil smoke can be smoothly discharged.

Optionally, the perforation rate of the micropore area in the middle is greater than the perforation rates of the micropore areas on both sides, so that the noise reduction cavity with a higher noise reduction frequency band is located at a position in the middle, and the noise reduction cavity with a lower noise reduction frequency band is distributed at positions on both sides, thereby achieving a better noise reduction effect.

Optionally, the aperture of the noise reduction micropore is 1mm, and the cavity depth is 30 mm; the area of each micropore area is 95mm multiplied by 185 mm;

the micropore areas comprise four, and in the transverse direction, the number of the perforations in the four micropore areas is respectively as follows: 12 × 24, 18 × 36, 20 × 40, and 15 × 30.

In this way, the noise in the frequency range of 900Hz-1400Hz, which is the main frequency of the noise generated by the range of the 900Hz-1400Hz, can be absorbed, so that the noise of the range of 900Hz-1400Hz of the range.

Optionally, the surrounding wall comprises a guide wall section arranged close to the smoke inlet, and the guide wall section is obliquely arranged towards the air inlet direction in the direction close to the microporous wall; therefore, the oil smoke can more smoothly pass through the cavity structure, and vortex noise is prevented from being generated on the air inlet side of the surrounding wall.

Optionally, the smoke collecting hood comprises a back plate and a smoke baffle plate arranged at the front side of the back plate at intervals, the air inlet duct is limited between the back plate and the smoke baffle plate, and the cavity structure is arranged on the rear plate surface of the smoke baffle plate; so, can be when dismantling the fender cigarette board, will cavity structure dismantles, thereby be convenient for cavity structure's dismantlement is washd.

Optionally, the noise reduction air duct piece comprises a fan cover, a smoke exhaust fan is arranged in the fan cover, an inner cavity of the fan cover is communicated with an air inlet of the smoke exhaust fan, and the smoke passing air duct comprises an inner cavity of the fan cover, so that in the operation process of the oil smoke suction device, the noise in the noise reduction air duct piece is reduced through a noise reduction cavity in the inner cavity of the fan cover.

In the technical scheme of the invention, a plurality of noise reduction cavities which are not communicated with each other are arranged on the smoke passing air channel of the noise reduction air channel piece, and the noise reduction frequency bands of at least two noise reduction cavities are different, so that in the operation process of the oil fume suction device, the noise in the oil fume suction device can be reduced through the noise reduction cavities on the smoke passing air channel, and the noise in different frequency bands of the noise can be reduced through the noise reduction cavities with different noise reduction frequency bands, thereby realizing the noise reduction in a wide frequency band and further reducing the operation noise of the oil fume suction device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of a range hood device of the present invention;

figure 2 is a schematic cross-sectional view of the range hood device of figure 1;

fig. 3 is a schematic structural view of a cavity structure of the range hood device in fig. 2;

FIG. 4 is a schematic cross-sectional structural view of the cavity structure of FIG. 3;

FIG. 5 is a graph of the sound absorption coefficient of the cavity structure of FIG. 3 for noise at various frequencies;

figure 6 is a graph comparing the magnitude of the noise at various frequencies for a range hood device of the present invention and a comparative range hood device;

fig. 7 is a schematic structural view of a centrifugal fan of the range hood device of fig. 1;

FIG. 8 is a schematic cross-sectional view of the centrifugal fan of FIG. 7;

figure 9 is a schematic structural view of another embodiment of the range hood device of the present invention;

fig. 10 is a schematic structural view of an air outlet housing of the range hood device of fig. 9;

fig. 11 is a schematic sectional structure view of the wind outlet cover in fig. 10.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				11	Exhaust fume collecting hood	110	Smoke inlet
11a	Air inlet duct	111	Back plate
				112	Smoke baffle	12	Fan cover
20	Noise reduction cavity	201	Noise reduction micropore
				2	Cavity structure	21	Microporous wall
22	Enclosure wall	23	Partition wall
				24	Mounting wall	221	Guide wall section
3	Centrifugal fan	31	Centrifugal volute
				32	Centrifugal wind wheel	310	Volute body
311	Housing wall	312	Inner casing wall
				313	First partition wall	4	Air outlet cover
40	Cover body	41	Outer cover wall
				42	Inner cover wall	43	Second partition wall
400	Air outlet duct

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an oil fume suction device which can be a range hood only with an oil fume suction function and also can be an integrated cooker with the oil fume suction function and other functions, wherein the other functions can be a function of disinfecting tableware (integrated with a disinfection cabinet), a function of cooking (integrated with a cooker, a microwave oven and the like), a function of cleaning the tableware (integrated with a dishwasher) and the like.

Referring to fig. 1 to 4, in an embodiment of the present invention, the range hood device has a range hood duct, and includes:

the noise reduction air duct piece is internally provided with a smoke passage, the smoke passage forms at least part of the oil absorption smoke air duct, the smoke passage is provided with a plurality of noise reduction cavities 20 which are not communicated with each other, the noise reduction cavities 20 are provided with noise reduction micropores 201 communicated with the smoke passage, and the depth of the cavities of at least two noise reduction cavities 20 and/or the perforation rate of the noise reduction micropores 201 are different, so that the noise reduction frequency bands of the two noise reduction cavities 20 are different.

In the technical scheme of the invention, a plurality of noise reduction cavities 20 which are not communicated with each other are arranged on the smoke passing air duct of the noise reduction air duct piece, and the noise reduction frequency bands of at least two noise reduction cavities 20 are different, so that in the operation process of the oil fume suction device, the noise in the oil fume suction device can be reduced through the noise reduction cavities 20 on the smoke passing air duct, and the noise in different frequency bands of the noise can be reduced through the noise reduction cavities 20 with different noise reduction frequency bands, thereby realizing the noise reduction in a wide frequency band and further reducing the operation noise of the oil fume suction device.

In this embodiment, optionally, the noise reduction frequency bands of the plurality of noise reduction cavities 20 are different from each other, so as to reduce noise in multiple frequency bands as much as possible, thereby increasing the noise reduction frequency band width of the range hood device. Of course, in other embodiments, the noise reduction frequency bands of some of the noise reduction cavities 20 may be the same, for example, when the noise amount of noise in a certain frequency band is much larger than that of noise in other frequency bands, the noise reduction frequency bands of two or more of the noise reduction cavities 20 may be set to be the same.

Referring to fig. 1 to 4, in the present embodiment, the range hood device specifically includes:

the smoke collecting cover 11 is provided with a smoke inlet 110 and an air inlet duct 11a communicated with the smoke inlet 110;

the fan cover 12 is arranged above the smoke collecting hood 11, the fan cover 12 is provided with a smoke outlet, and an inner cavity of the fan cover 12 is communicated with the air inlet duct 11 a; and

and the smoke exhaust fan is arranged in the inner cavity of the fan cover 12 and is provided with an air inlet and an air outlet, the air inlet is communicated with the inner cavity of the fan cover 12, and the air outlet is communicated with the smoke exhaust port.

Without loss of generality, the smoke exhaust port is communicated with the outdoor space so as to exhaust the oil smoke generated by cooking in the kitchen to the outside.

Further, the noise reduction duct piece comprises the smoke collecting hood 11, and the smoke passing duct comprises the air inlet duct 11 a; that is, the air inlet duct 11a is provided with a plurality of noise reduction cavities 20 that are not communicated with each other, the noise reduction cavities 20 are provided with noise reduction micropores 201 communicated with the air inlet duct 11a, and at least two noise reduction cavities 20 have different noise reduction frequency bands. Of course, in other embodiments, the noise reduction air duct may further include other air duct components constituting the oil smoke suction air duct.

In this embodiment, the depths of the noise reduction cavities 20 with different noise reduction frequency bands on the air inlet duct 11a are the same, but their respective perforation rates are different. However, the design is not limited thereto, in other embodiments, the perforation rates of the noise reduction cavities 20 with different noise reduction frequency bands on the air inlet duct 11a are the same, but their respective cavity depths are different; in other embodiments, the cavity depth and the perforation rate of the noise reduction cavities 20 with different noise reduction frequency bands on the air inlet duct 11a are different.

In this embodiment, the air inlet duct 11a is provided with a plurality of noise reduction cavities 20 that are not communicated with each other, and at least two noise reduction cavities 20 have different noise reduction frequency bands, so that in the operation process of the oil fume suction device, the internal noise can be reduced through the noise reduction cavities 20 on the air inlet duct 11a, and the noise in different frequency bands of the noises can be reduced through the noise reduction cavities 20 with different noise reduction frequency bands, thereby realizing the noise reduction in a wide frequency band, and further reducing the operation noise of the oil fume suction device.

In this embodiment, further referring to fig. 2, the range hood further includes a cavity structure 2 installed on the air duct wall of the air inlet duct 11a, and the plurality of noise reduction cavities 20 are disposed in the cavity structure 2. In this embodiment, the cavity structure 2 is additionally provided, so that a plurality of noise reduction cavities 20 can be formed without changing the air duct wall of the air inlet duct 11a, that is, the product can use the components of the air inlet duct 11a left by the old product and the molds corresponding to the components, thereby saving the production cost and the development cost. However, the design is not limited to this, and in other embodiments, the air duct wall of the air inlet duct 11a may be changed into a hollow double-layer structure without additionally providing the cavity structure 2, and the noise reduction micropores 201 are formed on an inner layer of the double-layer structure.

Alternatively, referring to fig. 3 and 4, the cavity structure 2 includes a microporous wall 21 spaced apart from the air duct wall, a surrounding wall 22 connecting the peripheries of the microporous walls 21, and a plurality of partition walls 23 disposed in the surrounding wall 22, the plurality of partition walls 23 being spaced apart from the air duct wall and the microporous walls 21 to partition the space between the air duct wall and the microporous walls 21 into a plurality of noise reduction cavities 20. It is understood that the noise reducing pores 201 are provided on the pore wall 21. In this embodiment, the cavity structure 2 is integrally formed, so that a plurality of noise reduction cavities 20 can be formed on the air duct wall only by one-time installation. However, the design is not limited to this, in other embodiments, the cavity structure 2 may further include a plurality of noise reduction bag bodies that are dispersedly disposed, each noise reduction bag body is provided with one noise reduction cavity 20, and during installation, each noise reduction bag body needs to be installed to the air duct wall one by one, so that a plurality of noise reduction cavities 20 can also be formed on the air duct wall.

It should be noted that, in this embodiment, the cavity structure 2 further includes a mounting wall 24 disposed to be attached to the air duct wall, the mounting wall 24 is opposite to the microporous wall 21 and is connected to the separating wall 23 and the end of the surrounding wall 22 far from the microporous wall 21, that is, the cavity structure 2 itself has a wall structure (the mounting wall 24) capable of closing the end of the noise reduction cavity 20 far from the microporous plate. However, the design is not limited thereto, and in other embodiments, the cavity structure 2 may not be provided with the mounting wall 24, and the end of the isolation wall 23 and the surrounding wall 22 away from the microporous wall 21 may be directly connected to the air duct wall, so that the noise reduction cavity 20 may be formed by means of the air duct wall, thereby making the cavity structure 2 simpler.

Optionally, a plurality of the partition walls 23 are arranged at intervals in the transverse direction to divide the space between the air duct wall and the microporous wall 21 into a plurality of the noise reduction cavities 20 arranged at intervals in the transverse direction; it will be understood that said partition wall 23 is elongated in the longitudinal direction; this kind of structure is suitable for the range hood equipment that has the broad size in the transverse direction, and in addition, in the transverse direction, the noise frequency channel of different positions usually can have the difference, and the setting is favorable to corresponding noise setting of frequency channel also to have the chamber 20 of making an uproar of corresponding noise setting. However, the design is not limited thereto, and in other embodiments, a plurality of the partition walls 23 may be arranged at intervals in the longitudinal direction to divide the space between the air duct wall and the microporous wall 21 into a plurality of the noise reduction cavities 20 arranged at intervals in the longitudinal direction; it will be understood that the partition wall 23 is transversely extending; in this way, a plurality of noise reduction cavities 20 can be obtained at intervals.

Optionally, the microporous wall 21 has a plurality of microporous regions corresponding to the noise reduction cavities 20 one to one, the cavity depths of the noise reduction cavities 20 are uniform, and the perforation rates of the microporous regions of different noise reduction cavities 20 with different noise reduction frequency bands are different. Considering that the air duct wall is usually provided as a smooth wall, the microporous wall 21 in this embodiment is also provided as a smooth wall so that the interval between the microporous wall 21 and the air duct wall is uniform everywhere, thereby making the cavity depth of the plurality of noise reduction cavities 20 uniform. Since the microporous wall 21 is a smooth wall, that is, the outer surface of the microporous wall 21 is a smooth surface, a step-shaped structure which is easy to cause eddy can be prevented from being formed on the outer surface of the microporous wall 21, the generation of eddy noise can be avoided, and the oil smoke can be smoothly discharged.

Optionally, the surrounding wall 22 comprises a guide wall section 221 disposed near the smoke inlet 110, wherein the guide wall section 221 is disposed obliquely to the air inlet direction in the direction near the microporous wall 21; so, on the one hand, the accessible guide wall section 221's water conservancy diversion effect for the oil smoke can pass through more smoothly cavity structure 2, on the other hand, still can avoid forming at the air inlet side of bounding wall 22 easily causes the step-like structure of vortex, avoids the production of vortex noise.

In this embodiment, optionally, the perforation rate of the micro-hole area in the middle is greater than the perforation rate of the micro-hole areas on both sides. Without loss of generality, high-frequency noise in the smoke exhaust fan is concentrated, and the smoke exhaust fan is usually installed at the middle position of the fan cover 12, so that the high-frequency noise tends to be transmitted on a middle route, the larger the perforation rate is, the higher the noise reduction frequency band of the noise reduction cavity 20 is, and therefore the perforation rate of the micropore area in the middle is larger than that of the micropore areas on two sides, so that the noise reduction cavity 20 with the higher noise reduction frequency band is located at the middle position, and the noise reduction cavities 20 with the lower noise reduction frequency band are distributed at the positions on two sides, and therefore the better noise reduction effect is achieved.

In the present embodiment, specifically, the aperture of the noise reduction micropores 201 is 1 mm. The cavity depth is 30 mm. The area of each micro-porous region was 95mm × 185 mm. And, the micropore area includes four, in the transverse direction, the perforation number on this four micropore areas is respectively: 12 x 24, 18 x 36, 20 x 40 and 15 x 30, so that the noise reduction frequency bands of the four noise reduction cavities 20 are 900Hz-1000Hz, 1150Hz-1300Hz, 1300Hz-1400Hz and 1000Hz-1150Hz in sequence in the transverse direction. According to the acoustic analogy circuit, the four noise reduction cavities 20 belong to a parallel structure, and the sound absorption effect is the superposition of the four sound absorption effects, so that the range of 900Hz to 1400Hz can be absorbed by the range of 900Hz to 1400Hz, and the frequency band of 900Hz to 1400Hz is the main frequency of the noise generated by the range of 900Hz to 1400Hz, thereby effectively reducing the noise of the range of oil smoke absorption equipment.

Specifically, referring to fig. 5, the sound absorption coefficient in the figure is a vertical incidence sound absorption coefficient, and as can be seen from the vertical incidence sound absorption coefficient of each frequency noise shown in fig. 5, the vertical incidence sound absorption coefficient of the range hood provided by the embodiment can reach more than 0.7 between 900Hz and 1400Hz, and the sound absorption effect is obvious. In addition, referring to fig. 6, the plurality of noise reduction cavities 20 are not provided in the range of the range.

It should be noted that the specific parameters related to the noise reduction cavity 20 are not exclusive, for example, when the aperture of the noise reduction micropores 201 is not 1mm, if each noise reduction cavity 20 is to reduce noise in the same frequency band, the cavity depth, the area of each micropore area, and the number of perforations in each micropore area may all be changed.

Further, referring to fig. 2, the smoke collecting hood 11 includes a back plate 111 and a smoke baffle 112 disposed at the front side of the back plate 111 at intervals, the air inlet duct 11a is limited between the back plate 111 and the smoke baffle 112, and the cavity structure 2 is disposed on the rear plate surface of the smoke baffle 112. It can be understood that, in this embodiment, the cavity structure 2 and the smoke barrier 112 are connected as a whole, so that the cavity structure 2 can be removed while the smoke barrier 112 is removed, thereby facilitating the removal and cleaning of the cavity structure 2. However, the design is not limited to this, in other embodiments, the cavity structure 2 may also be disposed on the front plate surface of the back plate 111, so that the back plate 111 provides an attachment for the cavity structure 2, and the cavity structure 2 can also be installed and fixed, in this case, when the cavity structure 2 needs to be cleaned, the smoke barrier 112 needs to be removed first, and then the cavity structure 2 needs to be removed. In addition, in this embodiment, a gap exists between the lower end of the smoke baffle 112 and the lower end of the back plate 111 to limit the smoke inlet 110; however, the design is not limited thereto, and in other embodiments, the smoke inlet 110 may also be directly formed at the lower portion of the smoke baffle 112.

Further, in another embodiment, the noise reduction duct may also include the fan guard 12, and the smoke passage may include an inner cavity of the fan guard 12; that is, a plurality of noise reduction cavities 20 which are not communicated with each other are arranged on the inner cavity of the fan guard 12, the noise reduction cavities 20 are provided with noise reduction micropores 201 which are communicated with the inner cavity of the fan guard 12, and the cavity depths of at least two noise reduction cavities 20 and/or the perforation rates of the noise reduction micropores 201 are different, so that the noise reduction frequency bands of the two noise reduction cavities 20 are different.

In this embodiment, the inner cavity of the fan guard 12 is provided with a plurality of noise reduction cavities 20 that are not communicated with each other, and at least two noise reduction cavities 20 have different noise reduction frequency bands, so that in the operation process of the oil fume suction device, the internal noise can be reduced through the noise reduction cavities 20 on the inner cavity of the fan guard 12, and the noise in different frequency bands of the noises can be reduced through the noise reduction cavities 20 with different noise reduction frequency bands, thereby realizing the noise reduction in a wide frequency band, and further reducing the operation noise of the oil fume suction device.

Further, referring to fig. 7 and 8, in a further embodiment, the smoke exhaust fan is set as the centrifugal fan 3, the centrifugal fan 3 has a strong smoke exhaust capability, and the noise meets the bottom. Of course, in other embodiments, the smoke exhaust fan may be configured as other types of fans.

Without loss of generality, the centrifugal fan 3 includes a centrifugal volute 31, and a centrifugal wind wheel 32 disposed in the centrifugal volute 31. In this further embodiment, the noise reduction duct may also include the centrifugal volute 31, the centrifugal volute 31 includes a volute body 310, and the smoke passage includes an inner cavity of the volute body 310; that is, the volute body 310 is provided with a plurality of noise reduction cavities 2 which are not communicated with each other, the noise reduction cavities 2 are provided with noise reduction micropores 201 communicated with the inner cavity of the volute body 310, and at least two noise reduction cavities 2 have different noise reduction frequency bands.

In this embodiment, the perforation rates of the noise reduction cavities 2 with different noise reduction frequency bands on the volute body 310 are the same, but their respective cavity depths are different. However, the design is not limited thereto, in other embodiments, the cavity depths of the noise reduction cavities 2 with different noise reduction frequency bands on the volute body 310 are the same, but their respective perforation rates are different; in other embodiments, the cavity depth and the perforation rate of the noise reduction cavity 2 with different noise reduction frequency bands on the volute body 310 are different.

In this embodiment, the volute body 310 is provided with a plurality of noise reduction cavities 2 which are not communicated with each other, and at least two noise reduction frequency bands of the noise reduction cavities 2 are different, so that after the centrifugal fan 3 with the centrifugal volute 31 is installed in the oil smoke suction duct of the oil smoke suction device, in the operation process of the oil smoke suction device, the pneumatic noise generated in the volute body 310 can be reduced through the noise reduction cavities 2, and the noise of different frequency bands in the pneumatic noise can be reduced through the noise reduction cavities 2 with different noise reduction frequency bands, so that the noise reduction in a wide frequency band is realized, and the operation noise of the oil smoke suction device is reduced.

Without loss of generality, the centrifugal wind wheel 32 is disposed within the volute body 310.

In this embodiment, optionally, the noise reduction cavities 2 are sequentially distributed in the extension direction of the volute line of the centrifugal volute 31, so that after the flue gas enters the volute body 310, the volute body 310 sequentially reduces noise of different frequency bands in the aerodynamic noise in the extension direction of the volute line, thereby effectively reducing the operating noise of the range hood. However, the design is not limited thereto, in other embodiments, the noise reduction cavities 2 may also be sequentially distributed in the axial direction (i.e., the thickness direction) of the volute body 310, so that after the flue gas enters the volute body 310, the pneumatic noise of different frequency bands may also be reduced by the noise reduction cavities 2 of corresponding noise reduction frequency bands, and the operating noise of the oil fume extraction device may also be effectively reduced.

In the present embodiment, specifically, referring to fig. 8, the volute body 310 includes:

an outer housing wall 311;

an inner housing wall 312 spaced within housing wall 311, wherein noise reducing micro-apertures 201 are disposed in inner housing wall 312; and

a plurality of first partition walls 313 are provided, and the plurality of first partition walls 313 are arranged at intervals between the housing wall 311 and the inner housing wall 312 to divide the space between the housing wall 311 and the inner housing wall 312 into a plurality of noise reduction chambers 2.

In this embodiment, the wall of the volute body 310 is provided as a hollow laminated structure to limit the space for forming the noise reduction chambers 2, so that the noise reduction chambers 2 are almost continuous, and the first partition wall 313 with only a thin layer is spaced, so that the wall of the volute body 310 can be utilized to a large extent to form as many noise reduction chambers 2 as possible.

However, the design is not limited thereto, in other embodiments, for a single-layer volute body 310, a plurality of convex hulls protruding outward may be disposed on the wall thereof, and a noise reduction cover plate having noise reduction pores 201 is disposed at the inner opening of each convex hull, so that a plurality of noise reduction cavities 2 can also be formed. In other embodiments, for the single-layer volute body 310, a plurality of noise reduction convex hulls protruding inwards may be further disposed on the wall body thereof, the noise reduction convex hulls are provided with noise reduction micropores 201, and an outer opening of each noise reduction convex hull is provided with a cover plate, so that a plurality of noise reduction cavities 2 can be formed.

In this embodiment, optionally, a plurality of the first partition walls 313 are sequentially arranged at intervals in the extension direction of the volute profile, so that a plurality of the noise reduction cavities 2 are sequentially distributed in the extension direction of the volute profile; it is understood that the first partition wall 313 extends in the axial direction of the volute body 310. In this embodiment, after the smoke enters the volute body 310, in the extending direction of the volute profile, the volute body 310 sequentially reduces noise of different frequency bands in the aerodynamic noise, so as to effectively reduce the operating noise of the range hood.

However, the design is not limited thereto, in other embodiments, the first partition walls 313 may also be sequentially arranged at intervals in the axial direction of the volute body 310, so that the noise reduction cavities 2 are sequentially distributed in the axial direction of the volute body 310; it is understood that the first partition wall 313 extends in the direction of extension of the volute profile; therefore, after the flue gas enters the volute body 310, the pneumatic noise of different frequency bands can be reduced by the noise reduction cavity 2 of the corresponding noise reduction frequency band, and the operation noise of the oil fume suction device can be effectively reduced.

In this embodiment, optionally, the perforation rates of the noise reduction micropores 201 at various positions on the inner casing wall 312 are the same, so that the inner casing wall 312 can be perforated conveniently, and the preparation efficiency of perforation is improved; while the different noise reduction chambers 2 with different noise reduction frequency bands have different chamber depths, i.e. the corresponding inner housing wall 312 portion and the housing wall 311 portion have different spacings for the different noise reduction chambers 2 with different noise reduction frequency bands. However, the design is not limited thereto, in other embodiments, the inner casing wall 312 and the casing wall 311 are spaced at the same interval at different positions on the volute body 310110, so that the cavity depth of each noise reduction cavity 2 is uniform, the inner casing wall 312 has micro-hole regions corresponding to different noise reduction cavities 2, and the micro-hole regions corresponding to different noise reduction cavities 2 with different noise reduction frequency bands have different perforation rates. In yet other embodiments, the different noise reduction chambers 2 with different noise reduction frequency bands have different perforation rates and different chamber depths, that is, the perforation rates of the micropore areas corresponding to the different noise reduction chambers 2 with different noise reduction frequency bands are different, and the interval between the corresponding portions of the inner housing wall 312 and the housing wall 311 is different.

In this embodiment, the inner casing wall 312 is a smooth annular wall, and the intervals between the casing wall 311 portions corresponding to the different noise reduction cavities 2 with different noise reduction frequency bands and the inner casing wall 312 are different. In this embodiment, since the inner wall 312 is a smooth annular wall, that is, the inner surface of the inner wall 312 is a smooth surface, a step-shaped structure that is easy to cause a vortex can be prevented from being formed on the inner surface of the inner wall 312, vortex noise can be prevented from being generated, and the smoke can be smoothly discharged.

In this embodiment, further, the housing wall 311 is in a gradually increasing step shape in the volute shape line extending direction of the centrifugal volute 31, and a first isolation wall 313 is correspondingly disposed between any two adjacent steps, so that the depths of the noise reduction cavities 2 are gradually increased in the volute shape line extending direction of the centrifugal volute 31, and thus, on one hand, the noise reduction frequency bands of the noise reduction cavities 2 sequentially distributed in the volute shape line extending direction are different, thereby reducing noise in multiple frequency bands as much as possible, and further increasing the noise reduction frequency band width of the centrifugal volute 31; on the other hand, it is beneficial to ensure that the cavity depths of the noise reduction cavities 2 are different, and it can be understood that if the step-shaped structure on the housing wall 311 is set to be increased first and then decreased in the extending direction of the volute profile, it is relatively not easy to determine the heights of the different steps located at the two opposite sides of the highest step, and particularly, it is relatively easier to have the phenomenon that the different steps located at the two opposite sides of the highest step have the same height, so that the different noise reduction cavities 2 having the same cavity depth appear.

In this embodiment, specifically, the aperture of the noise reduction micro-hole 201 on the inner casing wall 312 is 1.2 mm. In the extension direction of the volute molded line, the distance between the noise reduction micropores 201 is 10 mm. In the axial direction of the centrifugal scroll 31, the distance between the noise reduction micropores 201 is 8 mm. In addition, in the extension direction of the volute molded line, five noise reduction cavities 2 are arranged, and the cavity depths of the five noise reduction cavities 2 are 15mm, 18mm, 20mm, 25mm and 30mm in sequence; thus, the noise reduction frequency bands of the five noise reduction cavities 2 are 1300Hz-1400Hz, 1200Hz-1300Hz, 1100Hz-1200Hz, 1000Hz-1100Hz and 900Hz-1000Hz in sequence. According to the acoustic analogy circuit, the five noise reduction cavities 2 belong to a parallel structure, and the sound absorption effect is the superposition of the five sound absorption effects, so that the centrifugal volute 31 provided by the embodiment can absorb the pneumatic noise in the frequency range of 900Hz to 1400Hz, and the frequency band of 900Hz to 1400Hz is the main frequency of the pneumatic noise generated by the oil fume suction device, so that the centrifugal fan 3 with the centrifugal volute 31 can effectively reduce the pneumatic noise of the oil fume suction device.

Further, referring to fig. 9 to 11, in another embodiment, the range hood further includes an air outlet housing 4, the air outlet housing 4 is mounted at the smoke exhaust port, and the air outlet housing 4 includes:

the cover body 40 is internally provided with an air outlet duct 400, the cover body 40 is provided with a plurality of noise reduction cavities 2 which are not communicated with each other, the noise reduction cavities 2 are provided with noise reduction micropores 201 communicated with the air outlet duct 400, and at least two noise reduction frequency bands of the noise reduction cavities 2 are different.

In this embodiment, the cover 40 has noise reduction cavities 2 with different noise reduction frequency bands with the same perforation rate but different respective cavity depths. However, the design is not limited thereto, in other embodiments, the cavity depths of the noise reduction cavities 2 with different noise reduction frequency bands on the cover 40 are the same, but their respective perforation rates are different; in yet other embodiments, the cavity depth and the perforation rate of the noise reduction cavities 2 with different noise reduction frequency bands on the cover 40 are different.

In this embodiment, the cover body 40 of the air outlet cover 4 is provided with a plurality of noise reduction cavities 2 which are not communicated with each other, and at least two noise reduction frequency bands of the noise reduction cavities 2 are different, so that when the air outlet cover 4 is installed at the smoke exhaust port, in the operation process of the oil fume suction device, the pneumatic noise generated at the smoke exhaust port can be reduced through the noise reduction cavities 2 on the air outlet cover 4, and the noise of different frequency bands in the pneumatic noise can be reduced through the noise reduction cavities 2 with different noise reduction frequency bands, so that the noise reduction in a wide frequency band is realized, and the operation noise of the oil fume suction device is reduced.

In this embodiment, optionally, a plurality of noise reduction cavities 2 are sequentially distributed in the circumferential direction of the cover body 40, so that after the smoke is discharged to the air outlet cover 4, different frequency bands in the aerodynamic noise are gradually weakened in the axial direction of the cover body 40, thereby effectively reducing the operating noise of the range hood. However, the design is not limited to this, in other embodiments, the noise reduction cavities 2 may also be sequentially distributed in the axial direction of the cover body 40, so that after the flue gas is discharged to the air outlet cover 4, in the axial direction of the cover body 40, the air outlet cover 4 will sequentially reduce the noise of different frequency bands in the pneumatic noise, and the operating noise of the oil fume suction device can also be effectively reduced.

In this embodiment, specifically, referring to fig. 11, the cover 40 includes:

the housing wall 41;

the inner cover wall 42 is arranged in the outer cover wall 41 at intervals, the air outlet duct 400 is limited in the inner cover wall 42, and the noise reduction micropores 201 are arranged in the inner cover wall 42; and

and a plurality of second partition walls 43, wherein the plurality of second partition walls 43 are arranged between the outer cover wall 41 and the inner cover wall 42 at intervals to divide the space between the outer cover wall 41 and the inner cover wall 42 into a plurality of noise reduction cavities 2.

In the present embodiment, the wall body of the cover 40 is provided as a hollow laminated structure to limit the space for forming the noise reduction chambers 2, so that the noise reduction chambers 2 are almost continuous with each other, and the second partition wall 43 having only a thin layer is provided therebetween, so that the wall body of the cover 40 can be used to a large extent to form as many noise reduction chambers 2 as possible.

In this embodiment, optionally, a plurality of the second partition walls 43 are sequentially arranged at intervals in the circumferential direction of the cover 40, so that a plurality of the noise reduction cavities 2 are sequentially distributed in the circumferential direction of the cover 40; it will be appreciated that the second partition wall 43 extends in the axial direction of the cover 40. In this embodiment, after the smoke is discharged to the air outlet housing 4, different frequency bands in the aerodynamic noise are gradually weakened in the axial direction of the housing body 40, so as to effectively reduce the operating noise of the range hood.

However, the design is not limited thereto, in other embodiments, the second partition walls 43 may also be sequentially arranged at intervals in the axial direction of the cover body 40, so that the noise reduction cavities 2 are sequentially distributed in the axial direction of the cover body 40; it is to be understood that the second partition wall 43 extends in the circumferential direction of the cover 40; therefore, after the smoke is discharged to the air outlet cover 4, the air outlet cover 4 can sequentially reduce the noise of different frequency bands in the pneumatic noise in the axial direction of the cover body 40, and the operation noise of the oil fume suction device can also be effectively reduced.

In this embodiment, optionally, the perforation rates of the noise reduction micropores 201 at various positions on the inner cover wall 42 are the same, so that the inner cover wall 42 can be perforated conveniently, and the perforation preparation efficiency is improved; the different noise reduction cavities 2 with different noise reduction frequency bands have different cavity depths, namely, the corresponding inner cover wall 42 part and the outer cover wall 41 part have different intervals for the different noise reduction cavities 2 with different noise reduction frequency bands. However, the design is not limited thereto, in other embodiments, the inner cover wall 42 and the outer cover wall 41 are spaced at the same interval at different positions on the cover 40, so that the cavity depths of the noise reduction cavities 2 are the same, the inner cover wall 42 has micro-hole regions corresponding to different noise reduction cavities 2, and the micro-hole regions corresponding to different noise reduction cavities 2 with different noise reduction frequency bands have different perforation rates. In other embodiments, the different noise reduction cavities 2 with different noise reduction frequency bands have different perforation rates and different cavity depths, that is, the different noise reduction cavities 2 with different noise reduction frequency bands have different perforation rates of the corresponding micro-porous areas, and the corresponding inner and

outer cover walls

42 and 41 have different intervals.

In this embodiment, the inner cover wall 42 is a smooth annular wall, and the intervals between the portions of the outer cover wall 41 corresponding to the different noise reduction cavities 2 with different noise reduction frequency bands and the inner cover wall 42 are different. Typically, the inner housing wall 42 is a circular ring wall, but the inner housing wall 42 may be a square ring wall or other regular ring wall. In this embodiment, the inner cover wall 42 is a smooth annular wall, that is, the inner surface of the inner cover wall 42 is a smooth surface, so that a step-shaped structure that is easy to cause a vortex is not formed on the inner surface of the inner cover wall 42, vortex noise is not generated, and the smoke is smoothly discharged.

In this embodiment, further, the outer cover wall 41 is in a gradually increasing step shape in the circumferential direction of the cover body 40, and the second isolation wall 43 is correspondingly disposed between any two adjacent steps, so that the depths of the noise reduction cavities 2 are gradually increased in the circumferential direction of the cover body 40, and thus, on one hand, the noise reduction frequency bands of the noise reduction cavities 2 sequentially distributed in the circumferential direction of the cover body 40 are different, thereby reducing noise in multiple frequency bands as much as possible, and further improving the noise reduction frequency band width of the air outlet cover 4; on the other hand, it is beneficial to ensure that the cavity depths of the noise reduction cavities 2 are different, and it can be understood that if the step-shaped structure on the outer cover wall 41 is increased and then decreased in the circumferential direction of the cover body 40, the heights of the different steps located on the two opposite sides of the highest step are relatively difficult to judge, and particularly, the different steps located on the two opposite sides of the highest step are relatively easier to have the same height, so that the different noise reduction cavities 2 having the same cavity depth are caused to appear.

In the present embodiment, specifically, the aperture of the noise reduction micro-hole 201 on the inner cover wall 42 is 1.2 mm. In the circumferential direction of the cover 40, the distance between the noise reduction micropores 201 is 10 mm. In the axial direction of the cover 40, the distance between the noise reduction micropores 201 is 8 mm. In addition, six noise reduction cavities 2 are arranged in the circumferential direction of the cover body 40, the depths of the six noise reduction cavities 2 are 13mm, 15mm, 18mm, 20mm, 25mm and 30mm in sequence, and therefore the six noise reduction frequency bands are 1400Hz-1500Hz, 1300Hz-1400Hz, 1200Hz-1300Hz, 1100Hz-1200Hz, 1000Hz-1100Hz and 900Hz-1000Hz in sequence. According to the acoustic analogy circuit, the six noise reduction cavities 2 belong to a parallel structure, and the sound absorption effect is the superposition of six sound absorption effects, so that the air outlet cover 4 provided by the embodiment can absorb the pneumatic noise in the frequency range of 900Hz to 1400Hz, and the frequency band of 900Hz to 1400Hz is the main frequency of the pneumatic noise generated by the oil fume suction equipment, thereby adopting the air outlet cover 4 to effectively reduce the pneumatic noise of the oil fume suction equipment.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A range hood device, comprising:

2. The range hood device of claim 1 wherein the noise reduction bands of the noise reduction cavities are different.

3. The range hood of claim 1 wherein the noise reduction duct assembly comprises a smoke collection hood having a smoke inlet and an inlet duct in communication with the smoke inlet, the smoke passage comprising the inlet duct.

4. The range hood of claim 3 further comprising a cavity structure mounted to the wall of the air inlet duct, wherein the plurality of noise reduction cavities are disposed in the cavity structure.

5. The range hood of claim 4 wherein said chamber structure comprises a microporous wall spaced from said air path wall, an enclosure wall connecting the periphery of said microporous wall, and a plurality of partition walls disposed within said enclosure wall and spaced between said air path wall and said microporous wall to divide the space between said air path wall and said microporous wall into a plurality of said noise reduction chambers.

6. The range hood device of claim 5 wherein a plurality of said partition walls are spaced apart in the lateral direction to divide the space between said air duct wall and said microporous wall into a plurality of said noise reduction chambers spaced apart in the lateral direction.

7. The range hood device of claim 6 wherein said microporous wall has a plurality of microporous regions in one-to-one correspondence with a plurality of said noise reduction cavities, said noise reduction cavities having uniform cavity depth, and different noise reduction cavities having different noise reduction frequency bands having different porosity.

8. The range hood device of claim 7 wherein the perforated rate of the middle microporous region is greater than the perforated rate of the side microporous regions.

9. The range hood device of claim 8 wherein said noise reducing micro-holes have a hole size of 1mm and said cavity depth is 30 mm; the area of each micropore area is 95mm multiplied by 185 mm;

10. The range hood device according to claim 5, wherein said surrounding wall includes a guide wall section disposed adjacent to said smoke inlet, said guide wall section being inclined toward the direction of the intake air in a direction adjacent to said micro-porous wall.

11. The range hood according to any one of claims 4 to 10, wherein the range hood comprises a back plate and a smoke baffle plate arranged at a front side of the back plate at intervals, the air inlet duct is limited between the back plate and the smoke baffle plate, and the cavity structure is arranged on a rear plate surface of the smoke baffle plate.

12. The range hood of claim 1 wherein the noise reducing duct member comprises a fan guard, wherein a smoke exhaust fan is disposed in the fan guard, wherein an interior of the fan guard is in communication with an air inlet of the smoke exhaust fan, and wherein the smoke passing duct comprises an interior of the fan guard.