CN111102247B

CN111102247B - Amortization subassembly, centrifugal fan's spiral case subassembly, centrifugal fan and lampblack absorber

Info

Publication number: CN111102247B
Application number: CN201811252932.XA
Authority: CN
Inventors: 李清; 徐成茂; 周海珍; 李忠华; 郑志伟; 程杰锋; 张肃; 魏喜明
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2022-05-17
Anticipated expiration: 2038-10-25
Also published as: CN111102247A

Abstract

The invention discloses a silencing assembly, a volute assembly of a centrifugal fan, the centrifugal fan and a range hood, wherein the silencing assembly comprises: a microperforated plate provided with a plurality of microperforations that pass through in a thickness direction thereof, the plurality of microperforations being arranged so as to be spaced apart from each other; the backplate, be equipped with a plurality of back of the body chambeies on the backplate, every the back of the body chamber all has the intercommunication mouth, microperforated panel locates the backplate be equipped with the one side of intercommunication mouth, every the back of the body chamber the intercommunication mouth is relative with at least one the micro-perforation, so that every the back of the body chamber with at least one the micro-perforation intercommunication. According to the silencing assembly provided by the embodiment of the invention, the back plate defines a plurality of back cavities, and the plurality of micro-perforations on the micro-perforated plate correspond to the plurality of back cavities, so that the silencing assembly has better silencing and noise reducing effects.

Description

Amortization subassembly, centrifugal fan's spiral case subassembly, centrifugal fan and lampblack absorber

Technical Field

The invention relates to the technical field of noise reduction, in particular to a silencing assembly, a volute assembly of a centrifugal fan, the centrifugal fan and a range hood.

Background

In the correlation technique, sound absorbing material or microperforated panel such as cotton are inhaled to general usefulness and are fallen the amortization of making an uproar, adopt sound absorbing material to fall the amortization scheme of making an uproar and have following shortcoming: the overall appearance image of the product is reduced; the noise filter cannot be specially designed according to the frequency spectrum characteristic of noise so as to achieve a better sound absorption effect; easily adhere to stains, and is not easy to clean.

Although the above problems can be solved to a certain extent by adopting the micro-perforated plate to reduce noise, all micro-perforations on the micro-perforated plate in the related art share one back cavity, and the noise reduction effect is not good.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a sound-deadening assembly having a plurality of back chambers, which has better sound-deadening and noise-reducing effects.

The invention also provides a volute assembly of the centrifugal fan with the silencing assembly.

The invention also provides a centrifugal fan with the volute assembly of the centrifugal fan.

The invention also provides a range hood with the centrifugal fan.

The invention also provides a range hood with the silencing assembly.

A muffler assembly according to an embodiment of the first aspect of the present invention includes: a microperforated plate provided with a plurality of microperforations that pass through in a thickness direction thereof, the plurality of microperforations being arranged so as to be spaced apart from each other; the backplate, be equipped with a plurality of back of the body chambeies on the backplate, every the back of the body chamber all has the intercommunication mouth, microperforated panel locates the backplate be equipped with the one side of intercommunication mouth, every the back of the body chamber the intercommunication mouth is relative with at least one the micro-perforation, so that every the back of the body chamber with at least one the micro-perforation intercommunication.

According to the silencing assembly provided by the embodiment of the invention, the back plate defines a plurality of back cavities, and the plurality of micro-perforations on the micro-perforated plate correspond to the plurality of back cavities, so that the silencing assembly has better silencing and noise reducing effects.

In addition, the silencing assembly according to the embodiment of the invention may also have additional technical features:

according to one embodiment of the invention, the number of the back cavities is equal to the number of the micro-perforations, and the back cavities and the micro-perforations are communicated in a one-to-one correspondence manner.

According to one embodiment of the present invention, the number of said back cavities is smaller than the number of said micro-perforations, at least one of said back cavities being in communication with a plurality of said micro-perforations.

According to one embodiment of the invention, a plurality of said microperforations are distributed in an array.

Optionally, a plurality of said microperforations in a same row or a plurality of said microperforations in a same column communicate with a same said back cavity.

According to one embodiment of the invention, the microperforated panel has a perforation rate ε of 5% or less, where the perforation rate ε is the ratio of the sum of the areas of the microperforations on the microperforated panel to the area of the microperforations.

A volute assembly for a centrifugal fan according to an embodiment of a second aspect of the invention comprises: the volute comprises a front plate and a rear plate which are oppositely arranged in the front-rear direction, and a coaming plate connected between the front plate and the rear plate, wherein the front plate, the rear plate and the coaming plate jointly define an air outlet machine cavity, at least one of the front plate and the rear plate is provided with an air inlet, and the coaming plate is provided with an air outlet; the volute tongue assembly is connected to the air outlet of the volute, the inner wall surface of the volute tongue assembly is provided with the noise reduction assembly according to the first aspect of the invention, and the back plate is arranged towards the inner wall surface of the volute tongue assembly.

According to the volute component provided by the embodiment of the invention, the silencing component provided by the embodiment of the first aspect of the invention is arranged on the inner wall surface of the volute tongue component, sound waves of noise generated at the volute tongue component penetrate through the micro-perforations, the sound wave energy causes air in the micro-perforations to vibrate, and the air in the micro-perforations can rub against the micro-perforated plate during vibration, so that the noise energy is consumed, and the purposes of silencing and reducing noise are achieved. When the noise frequency is the same as the natural frequency of the elastic system, the air in the micro-perforations will be caused to resonate strongly, and the friction between the air in the micro-perforations and the micro-perforated plate is more severe, so that the noise reduction effect is better. The noise reduction component can well reduce the noise generated at the volute tongue component, thereby reducing the noise of the centrifugal fan during working and improving the overall quality of the centrifugal fan.

Optionally, the volute tongue assembly includes a volute tongue and an air guide section, the volute tongue is connected between the volute casing and the air guide section, the air guide section extends in an inclined manner in a direction away from the volute tongue, and the noise reduction assembly is arranged on an inner wall surface of at least one of the volute tongue and the air guide section.

A centrifugal fan according to an embodiment of a third aspect of the present invention includes: a volute assembly according to an embodiment of the second aspect of the invention; the wind wheel is rotatably arranged in the fan cavity to drive airflow to flow from the air inlet to the air outlet.

According to the centrifugal fan provided by the embodiment of the invention, the volute assembly provided by the embodiment of the second aspect of the invention has all the advantages of the volute assembly, sound waves of noise generated at the volute tongue assembly penetrate through the micro-perforations, the sound wave energy causes the air in the micro-perforations to vibrate, and the air in the micro-perforations can rub against the micro-perforated plate during vibration, so that the noise energy is consumed, and the purposes of noise reduction and noise reduction are achieved. When the noise frequency is the same as the natural frequency of the elastic system, the air in the micro-perforations will be caused to resonate strongly, and the friction between the air in the micro-perforations and the micro-perforated plate is more severe, so that the noise reduction effect is better. The noise reduction component can well reduce the noise generated at the volute tongue component, thereby reducing the noise of the centrifugal fan during working and improving the overall quality of the centrifugal fan.

A range hood according to an embodiment of a fourth aspect of the present invention includes: the smoke exhaust device comprises a shell, wherein a smoke channel is formed in the shell and is provided with a smoke outlet; the smoke collecting cover is internally provided with a smoke collecting cavity, the smoke collecting cavity is provided with a smoke inlet, the smoke collecting cover is arranged below the shell, and the smoke inlet is communicated with the flue; according to the centrifugal fan in the embodiment of the third aspect of the present invention, the centrifugal fan is disposed in the flue, the air inlet is communicated with the smoke inlet through the flue, and the air outlet is communicated with the smoke outlet.

According to the range hood disclosed by the embodiment of the invention, the centrifugal fan disclosed by the embodiment of the third aspect of the invention is arranged, so that the noise of the range hood in working is low, and the overall quality of the range hood is improved.

Optionally, a silencing assembly according to the above first aspect of the present invention is further disposed in the flue adjacent to the air inlet, and the micro-perforated plate is disposed toward the air inlet.

Optionally, a silencing assembly is disposed adjacent to the air inlet, and in a flow direction of the air flow in the flue, a side of the micro-perforated plate adjacent to the air inlet extends obliquely toward the air inlet.

Optionally, the micro-perforated plate is formed into a planar plate-shaped structure, the back plate is formed into a wedge-shaped structure, the communication port is formed on the inclined surface of the back plate, and the micro-perforated plate is attached to the inclined surface of the back plate.

According to a fifth aspect embodiment of the present invention, a range hood includes: the smoke exhaust device comprises a shell, wherein a smoke channel is formed in the shell and is provided with a smoke outlet; the smoke collecting cover is internally provided with a smoke collecting cavity, the smoke collecting cavity is provided with a smoke inlet, the smoke collecting cover is arranged below the shell, and the smoke inlet is communicated with the flue; the fan is arranged in the flue and provided with at least one air inlet and one air outlet, the air inlet is communicated with the smoke inlet through the flue, and the air outlet is communicated with the smoke outlet; according to the silencing assembly of the embodiment of the first aspect of the present invention, the silencing assembly is disposed in the flue and adjacent to the air inlet, and the micro-perforated plate is disposed toward the air inlet.

According to the range hood provided by the embodiment of the invention, the noise reduction assembly provided by the embodiment of the first aspect of the invention is arranged, so that the noise of the range hood during working is low, and the overall quality of the range hood is high.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a muffler assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a back plate of a noise reduction assembly according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a centrifugal fan according to an embodiment of the present invention;

FIG. 4 is a schematic view of another angle of the centrifugal fan shown in FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a schematic structural diagram of a range hood according to an embodiment of the present invention;

fig. 7 is an exploded view of a range hood according to an embodiment of the present invention.

Reference numerals:

a sound attenuating assembly 100;

a micro-perforated plate 1; a micro-perforation 11;

a back plate 2; a back cavity 21; a communication port 211;

a volute assembly 200;

a volute 201; a front plate 2011; a back plate 2012; a coaming 2013; an air inlet 2014; an air outlet 2015;

a volute tongue assembly 202; a volute tongue 2021; an air guiding section 2022;

a centrifugal fan (blower) 300; a wind wheel 301;

a range hood 400; a housing 401; a smoke outlet 4011; a fume collecting hood 402; a smoke inlet 4021.

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 reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Referring to fig. 1-2, a noise reduction assembly 100 according to an embodiment of the present invention is described, and it should be noted that the noise reduction assembly 100 is used for noise reduction and noise reduction, and can be applied to any place where noise is generated, such as noise reduction of a fan 300, noise reduction in a range hood duct, and the like, which will be described below.

Referring to fig. 1-2, a muffler assembly 100 according to an embodiment of the present invention includes: a microperforated plate 1 and a backing plate 2.

The microperforated plate 1 is provided with a plurality of microperforations 11 that pass through in its thickness direction, and the microperforations 11 are arranged at intervals from one another, and it should be noted that the microperforations 11 described in this application refer to holes having a hole diameter of 1mm or less. The shape of the microperforations 11 may be arbitrarily chosen, and may, for example, be circular, elliptical, polygonal, etc.

Be equipped with a plurality of back of the body chambeies 21 on backplate 2, every back of the body chamber 21 all has intercommunication mouth 211, one side that is equipped with intercommunication mouth 211 of backplate 2 is located to micropunch plate 1, specifically, intercommunication mouth 211 of a plurality of back of the body chambeies 21 all lies in same one side of backplate 2, when the first surface of backplate 2 is located to intercommunication mouth 211 of a plurality of back of the body chambeies 21, one side of the first surface of backplate 2 is located to micropunch plate 1, when the second surface of backplate 2 is located to intercommunication mouth 211 of a plurality of back of the body chambeies 21, one side of the second surface of backplate 2 is located to micropunch plate 1. It is to be noted that, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The communication port 211 of each back chamber 21 is opposed to at least one microperforation 11 so that each back chamber 21 communicates with at least one microperforation 11. That is, the communication port 211 of each back cavity 21 may be opposite one microperforation 11, two microperforations 11, three microperforations 11, or more microperforations 11, the back cavity 21 communicates with one microperforation 11 when the communication port 211 of the back cavity 21 is opposite the one microperforation 11, the back cavity 21 communicates with two microperforations 11 when the communication port 211 of the back cavity 21 is opposite the two microperforations 11, the back cavity 21 communicates with three microperforations 11 when the communication port 211 of the back cavity 21 is opposite the three microperforations 11, and so on.

The noise reduction principle of the noise reduction assembly 100 is as follows: the air in the micro-perforations 11 and the air in the back cavity 21 communicated with the micro-perforations 11 form an elastic system, sound waves of noise pass through the micro-perforations 11, the sound wave energy causes the air in the micro-perforations 11 to vibrate, and the air in the micro-perforations 11 can rub against the micro-perforated plate 1 during vibration, so that the noise energy is consumed, and the purposes of noise reduction and noise reduction are achieved. When the noise frequency and the natural frequency of the elastic system are the same, it will cause the air inside the micro-perforations 11 to resonate strongly, and at the same time the friction between the air inside the micro-perforations 11 and the micro-perforated plate 1 is more severe, thus making the noise reduction effect better. Therefore, in the design process, the thickness and the perforation rate of the micro-perforated plate 21 and the parameters such as the shape, the size and the like of the micro-perforated plate 11 and the back cavity 21 can be designed according to the characteristics of the noise frequency spectrum, so that the noise frequency is approximately the same as the natural frequency of an elastic system, and the better noise reduction effect can be achieved.

According to the sound attenuation assembly 100 of the embodiment of the invention, the back plate 2 defines a plurality of back cavities 21, and the plurality of micro-perforations 11 on the micro-perforated plate 1 correspond to the plurality of back cavities 21, so that the sound attenuation and noise reduction effects of the sound attenuation assembly 100 can be better.

Alternatively, the microperforated panel 1 may be a plastic or metal piece; the back plate 2 may be a plastic or metal member. Therefore, the whole structure of the silencing assembly 100 is attractive, the technological sense is higher, and the silencing assembly is easy to clean.

In one embodiment of the present invention, as shown in fig. 1, 2 and 5, the number of back cavities 21 is equal to the number of microperforations 11, one communication port 211 corresponds to one microperforation 11, and back cavities 21 and microperforations 11 communicate in a one-to-one correspondence. This results in better sound and noise reduction of the sound attenuating assembly 100.

In one embodiment of the invention, the number of back cavities 21 is less than the number of microperforations 11, with at least one back cavity 21 communicating with a plurality of microperforations 11. The two embodiments are also included, and the number of the micro-perforations 11 correspondingly communicated with each back cavity 21 is all equal; or the number of the micro-perforations 11 corresponding to each back cavity 21 is not completely equal. For example, when the number of the micro-perforations 11 is 100 and the number of the back cavities 21 is 50, it may be that every two micro-perforations 11 are correspondingly communicated with one back cavity 21, that is, the number of the micro-perforations 11 correspondingly communicated with each back cavity 21 is all equal; or 10 back cavities 21 are respectively and correspondingly communicated with 2 micro-perforations 11, 20 back cavities 21 are respectively and correspondingly communicated with 3 micro-perforations 11, and 20 back cavities 21 are respectively and correspondingly communicated with 1 micro-perforation 11, that is, the number of the micro-perforations 11 correspondingly communicated with each back cavity 21 is not equal completely.

In one embodiment of the present invention, as shown in fig. 1 and 2, the plurality of microperforations 11 are distributed in an array, so that the structure of the microperforation plate 1 is regular, and the sound attenuation effect is good.

Further, a plurality of microperforations 11 in the same row or a plurality of microperforations 11 in the same column communicate with the same back cavity 21. Specifically, a plurality of microperforations 11 located in the same row communicate with the same back cavity 21, or a plurality of microperforations 11 located in the same column communicate with the same back cavity 21. Therefore, the production and the manufacture of the back plate 2 are convenient, and the noise reduction effect of the noise reduction assembly 100 is good. Alternatively, the micro-perforations 11 of adjacent rows on the micro-perforated plate 1 communicate with the same back cavity 21, or the micro-perforations 11 of adjacent columns on the micro-perforated plate 1 communicate with the same back cavity 21, thereby further simplifying the production of the back plate 2.

Preferably, as shown in fig. 1-2, the plurality of micro-perforations 11 and the plurality of back cavities 21 are distributed in an array, and the back cavities 21 and the micro-perforations 11 are in one-to-one correspondence. This makes the overall structure of the noise reduction assembly 100 beautiful and the noise reduction effect better.

Of course, the arrangement of the plurality of micro-perforations 11 in the present application is not limited to the above array arrangement, and may also be formed into a ring-shaped arrangement, for example, and the arrangement of the plurality of micro-perforations 11 is not limited in the present application. Similarly, the arrangement of the plurality of back cavities 21 in the present application is not limited to the array arrangement described above, and may also be formed into a ring-shaped arrangement, for example, and the arrangement of the plurality of back cavities 21 is not limited in the present application.

In one embodiment of the invention, the microperforated panel 1 has a perforation rate ε of 5% or less, where the perforation rate ε is the ratio between the sum of the areas of the plurality of microperforations 11 on the microperforated panel 1 and the area of the microperforated panel 1. Thereby resulting in better sound and noise reduction of the sound attenuating assembly 100.

It should be noted that the shapes of the microperforated plate 1 and the back plate 2 of the present application may be arbitrarily selected, and for example, they may be a planar plate-like structure; for example, it may be a cambered plate-like structure; as it may be a wave-shaped plate structure or the like, it will be appreciated that the microperforated plate 1 and the back plate 2 may be formed in any regular or irregular plate structure.

In one embodiment of the present invention, the microperforated panel 1 and the backplate 2 of the noise damping assembly 100 are detachably connected, so that the microperforated panel 1 and the backplate 2 can be separated for separate cleaning during cleaning, thereby facilitating the cleaning operation. The connection between the microperforated panel 1 and the back plate 2 may be chosen arbitrarily, for example, by snap-fit connection, or by threaded fasteners, etc.

Of course, the present application is not limited thereto, and the micro-perforated plate 1 and the back plate 2 of the sound attenuation module 100 may also be non-detachably connected by bonding or welding. In addition, the micro-perforated plate 1 and the back plate 2 of the sound attenuation module 100 can be an integral piece, so that the production and assembly processes can be simplified.

A volute assembly 200 of a centrifugal fan 300 in accordance with an embodiment of the invention is described below with reference to fig. 3-5.

The volute assembly 200 of the centrifugal fan 300 according to the embodiment of the invention comprises a volute 201 and a volute tongue assembly 202.

The volute 201 comprises a front plate 2011 and a rear plate 2012 which are oppositely arranged in the front-rear direction, and a shroud 2013 connected between the front plate 2011 and the rear plate 2012, wherein the front plate 2011, the rear plate 2012 and the shroud 2013 jointly define an air outlet cavity, an air inlet 2014 is arranged on at least one of the front plate 2011 and the rear plate 2012, that is, the air inlet 2014 is arranged only on one of the front plate 2011 and the rear plate 2012, or the air inlet 2014 is arranged on both the front plate 2011 and the rear plate 2012, an air outlet 2015 is arranged on the shroud 2013, the volute tongue assembly 202 is connected to the air outlet 2015 of the volute 201, the silencing assembly 100 according to the above-mentioned first aspect embodiment of the invention is arranged on the inner wall surface of the volute tongue assembly 202, and the back plate 2 is arranged towards the inner wall surface of the volute tongue assembly 202.

The spiral volute component 200 of the centrifugal fan 300 can generate a large wind pressure, however, the volute component 200 can generate a large aerodynamic noise while generating a large wind pressure, the volute tongue component 202 of the centrifugal fan 300 has a very large influence on the aerodynamic noise, and wind enters the fan cavity from the wind inlet 2014 and then continuously impacts the volute tongue component 202 in the process of going out from the wind outlet 2015, so that the noise at the volute tongue component 202 is generally a position where the noise generated on the centrifugal fan 300 is more prominent.

According to the volute assembly 200 of the embodiment of the invention, by providing the sound attenuation assembly 100 according to the above first aspect of the invention on the inner wall surface of the volute tongue assembly 202, sound waves of noise generated at the volute tongue assembly 202 pass through the micro-perforations 11, the sound wave energy causes air in the micro-perforations 11 to vibrate, and the air in the micro-perforations 11 can rub against the micro-perforated plate 1 during vibration, so that noise energy is consumed, and the purpose of sound attenuation and noise reduction is achieved. When the noise frequency and the natural frequency of the elastic system are the same, it will cause the air inside the micro-perforations 11 to resonate strongly, and at the same time the friction between the air inside the micro-perforations 11 and the micro-perforated plate 1 is more severe, thus making the noise reduction effect better. Therefore, the noise reduction assembly 100 can well reduce the noise generated at the volute tongue assembly 202, thereby reducing the noise generated when the centrifugal fan 300 works and improving the overall quality of the centrifugal fan 300.

Preferably, the microperforated panel 1 and the back panel 2 of the acoustic attenuation module 100 are shaped to match the shape of the inner wall surface of the volute tongue assembly 202 so that the acoustic attenuation module 100 as a whole can better conform to the inner wall surface of the volute tongue assembly 202.

Optionally, as shown in fig. 3 to 5, the volute tongue assembly 202 includes a volute tongue 2021 and an air guiding section 2022, the volute tongue 2021 is connected between the volute 201 and the air guiding section 2022, the air guiding section 2022 extends obliquely in a direction away from the volute tongue 2021, and the centrifugal fan 300 blows air under the guidance of the air guiding section 2022, thereby making the air blowing process of the centrifugal fan 300 smoother. The inner wall surface of at least one of the volute tongue 2021 and the air guide section 2022 is provided with the silencing component 100, that is, the silencing component 100 can be only arranged on the inner wall surface of the volute tongue 2021; or the silencing assembly 100 (as shown in fig. 3-5) may be only arranged on the inner wall surface of the air guiding section 2022, the structure of the air guiding section 2022 is more regular, and the silencing assembly 100 is arranged on the air guiding section 2022, so that the structural design of the silencing assembly 100 is simple and the assembly operation is convenient; or the silencing assemblies 100 can be arranged on the inner wall surface of the volute tongue 2021 and the inner wall surface of the air guide section 2022, so that the silencing and noise reduction effects are better.

A centrifugal fan 300 according to an embodiment of the third aspect of the present invention is described below with reference to fig. 3 to 5.

A centrifugal fan 300 according to an embodiment of the invention comprises a volute assembly 200 and a wind wheel 301 according to the above-described second aspect embodiment of the invention. The wind wheel 301 is rotatably disposed in the fan cavity to drive the airflow from the air inlet 2014 to the air outlet 2015.

According to the centrifugal fan 300 of the embodiment of the invention, by arranging the volute assembly 200 of the embodiment of the second aspect of the invention, the centrifugal fan 300 has all the advantages of the volute assembly 200, sound waves of noise generated at the volute tongue assembly 202 penetrate through the micro-perforations 11, the sound wave energy causes the air in the micro-perforations 11 to vibrate, and the air in the micro-perforations 11 can rub against the micro-perforated plate 1 when vibrating, so that the noise energy is consumed, and the purposes of noise reduction and noise reduction are achieved. When the noise frequency and the natural frequency of the elastic system are the same, the air inside the micro-perforations 11 will be caused to resonate strongly, and the friction between the air inside the micro-perforations 11 and the micro-perforated plate 1 will be more severe, resulting in better noise reduction. Therefore, the noise reduction assembly 100 can well reduce the noise generated at the volute tongue assembly 202, thereby reducing the noise generated when the centrifugal fan 300 works and improving the overall quality of the centrifugal fan 300.

A range hood 400 according to a fourth aspect embodiment of the present invention is described below with reference to fig. 1 to 7.

As shown in fig. 6 to 7, a range hood 400 according to an embodiment of the present invention includes: a housing 401, a fume collecting hood 402 and a centrifugal fan 300 according to the above-described third aspect embodiment of the present invention.

A flue is formed in the housing 401, the flue has a smoke outlet 4011, for example, as shown in fig. 6 and 7, the smoke outlet 4011 is arranged on the top wall of the housing 401, a smoke collecting cavity is defined in the smoke collecting cover 402, the smoke collecting cavity has a smoke inlet 4021, the smoke collecting cover 402 is arranged below the housing 401, the smoke inlet 4021 is communicated with the flue, the centrifugal fan 300 is arranged in the flue, the air inlet 2014 is communicated with the smoke inlet 4021 through the flue, and the air outlet 2015 is communicated with the smoke outlet 4011.

When the range hood 400 works, the centrifugal fan 300 operates to form negative pressure at the smoke inlet 4021, so that indoor air is driven to enter a flue through the smoke inlet 4021, then enters the centrifugal fan 300 through the air inlet 2014, then flows out of the centrifugal fan 300 through the air outlet 2015, and finally is discharged to the outdoor through the smoke outlet 4011, and accordingly the purpose of sucking oil smoke is achieved. The fume collecting hood 402 has a gathering and guiding function on the airflow, and guides the indoor air toward the fume inlet 4021, so that the air enters the flue through the fume inlet 4021.

According to the range hood 400 of the embodiment of the invention, by arranging the centrifugal fan 300 of the embodiment of the third aspect of the invention, the noise generated by the range hood 400 in operation is small, and the overall quality of the range hood 400 is improved.

It can be understood that, when the range hood 400 is in operation, wind in a flue enters the fan 300 from the air inlet 2014, noise at the air inlet 2014 of the fan 300 is relatively prominent, and the noise at the air inlet 2014 of the fan 300 is transmitted to the whole kitchen through other structures of the range hood 400, so that the influence on a user is great.

To this end, in a preferred embodiment of the present invention, the silencing assembly 100 according to the above-mentioned first aspect of the present invention is further disposed in the flue adjacent to the air inlet 2014, and the micro-perforated plate 1 is disposed toward the air inlet 2014. It should be noted that the silencing assembly 100 is disposed adjacent to the air inlet 2014, but a gap is formed between the silencing assembly 100 and the air inlet 2014 to prevent the silencing assembly 100 from blocking the air inlet 2014.

The sound wave of the noise generated at the air inlet 2014 passes through the micro-perforations 11, the sound wave energy causes the air in the micro-perforations 11 to vibrate, and the air in the micro-perforations 11 can rub against the micro-perforated plate 1 during vibration, so that the noise energy is consumed, and the purposes of silencing and reducing noise are achieved. When the noise frequency and the natural frequency of the elastic system are the same, it will cause the air inside the micro-perforations 11 to resonate strongly, and at the same time the friction between the air inside the micro-perforations 11 and the micro-perforated plate 1 is more severe, thus making the noise reduction effect better. From this the noise of air intake 2014 department can be reduced well to the noise of greatly reduced lampblack absorber 400 during operation promotes lampblack absorber 400's holistic quality.

When the centrifugal fan 300 is provided with the air inlets 2014 on both sides, the silencing assembly 100 may be disposed at only one of the air inlets 2014, or the silencing assemblies 100 may be disposed at two of the air inlets 2014, respectively.

Alternatively, as shown in fig. 7, the sound attenuation module 100 is disposed adjacent to the air inlet 2014, and in the flowing direction of the air flow in the flue, the side of the micro-perforated plate 1 adjacent to the air inlet 2014 extends obliquely toward the air inlet 2014. Specifically, indoor air enters the flue through the smoke inlet 4021, the air flows from bottom to top in the flue, one side of the micro-perforated plate 1 adjacent to the air inlet 2014 extends obliquely from bottom to top in the direction of the air inlet 2014, and the silencing assembly 100 plays a role in guiding the flow of air flow while silencing and reducing noise, so that the air flow in the flue more smoothly enters the fan 300 through the air inlet 2014. Thereby improving the efficiency of sucking the soot of the range hood 400.

Further, as shown in fig. 7, the micro-perforated plate 1 is formed in a planar plate-like structure, the back plate 2 is formed in a wedge-shaped structure, the communication port 211 is formed on the inclined surface of the back plate 2, and the micro-perforated plate 1 is attached on the inclined surface of the back plate 2. Specifically, the inclined surface of the backplate 2 extends obliquely toward the air inlet 2014 in the direction from bottom to top, and the micro-perforated plate 1 is attached to the inclined surface of the backplate 2, so that the micro-perforated plate 1 extends obliquely toward the air inlet 2014 in the direction from bottom to top.

The noise reduction assembly 100 disposed adjacent to the air inlet 2014 may be connected to an inner wall surface of the housing 401, and the noise reduction assembly 100 may be detachably connected to the inner wall surface of the housing 401, for example, the noise reduction assembly 100 may be connected to the inner wall surface of the housing 401 by a snap structure or a threaded fastener, and the noise reduction assembly 100 may be detachably connected to the inner wall surface of the housing 401, so that the noise reduction assembly 100 may be conveniently cleaned. Of course, the present application is not limited thereto, and the sound-deadening assembly 100 may be non-detachably attached to the inner wall surface of the housing 401, for example, may be bonded or welded to the inner wall surface of the housing 401.

A range hood 400 according to an embodiment of a fifth aspect of the present invention is described below with reference to fig. 1 to 7.

As shown in fig. 6 to 7, a range hood 400 according to an embodiment of the present invention includes: a housing 401, a fume collecting hood 402, a fan 300 and a silencer assembly 100 according to embodiments of the first aspect of the present invention described above.

The casing 401 is internally provided with a flue, the flue is provided with a smoke outlet 4011, a smoke collecting cavity is defined in the smoke collecting cover 402, the smoke collecting cavity is provided with a smoke inlet 4021, the smoke collecting cover 402 is arranged below the casing 401, the smoke inlet 4021 is communicated with the flue, the fan 300 is arranged in the flue, the fan 300 is provided with at least one air inlet 2014 and an air outlet 2015, the air inlet 2014 is communicated with the smoke inlet 4021 through the flue, and the air outlet 2015 is communicated with the smoke outlet 4011. The type of the fan 300 may be arbitrarily selected, and may be, for example, a centrifugal fan 300, a cross-flow fan 300, an axial-flow fan 300, or the like.

When the range hood 400 works, the fan 300 operates to form negative pressure at the smoke inlet 4021, so that indoor air is driven to enter a flue through the smoke inlet 4021, then enters the fan 300 through the air inlet 2014, then flows out of the fan 300 through the air outlet 2015, and finally is discharged to the outdoor through the smoke outlet 4011, and accordingly the purpose of sucking oil smoke is achieved. The fume collecting hood 402 has a gathering and guiding function on the airflow, and guides the indoor air toward the fume inlet 4021, so that the air enters the flue through the fume inlet 4021.

The silencing assembly 100 is arranged in the flue and is adjacent to the air inlet 2014, and the micro-perforated plate 1 is arranged towards the air inlet 2014. It should be noted that the silencing assembly 100 is disposed adjacent to the air inlet 2014, but a gap is formed between the silencing assembly 100 and the air inlet 2014 to prevent the silencing assembly 100 from blocking the air inlet 2014. The sound wave of the noise generated at the air inlet 2014 passes through the micro-perforations 11, the sound wave energy causes the air in the micro-perforations 11 to vibrate, and the air in the micro-perforations 11 can rub against the micro-perforated plate 1 during vibration, so that the noise energy is consumed, and the purposes of silencing and reducing noise are achieved. When the noise frequency and the natural frequency of the elastic system are the same, it will cause the air inside the micro-perforations 11 to resonate strongly, and at the same time the friction between the air inside the micro-perforations 11 and the micro-perforated plate 1 is more severe, thus making the noise reduction effect better. From this the noise of air intake 2014 department can be reduced well to the noise of greatly reduced lampblack absorber 400 during operation promotes lampblack absorber 400's holistic quality.

When the fan 300 has a plurality of air inlets 2014, the silencing assembly 100 may be disposed at only one of the air inlets 2014, or the silencing assembly 100 may be disposed at each of the air inlets 2014.

According to the range hood 400 provided by the embodiment of the invention, the silencing assembly 100 is arranged in the flue and adjacent to the air inlet 2014, so that the noise at the air inlet 2014 can be reduced, the working noise of the range hood 400 is further reduced, and the overall quality of the range hood 400 is improved.

Alternatively, as shown in fig. 7, the silencing assembly 100 disposed adjacent to the air inlet 2014, in the flow direction of the air flow in the flue, the side of the micro-perforated plate 1 adjacent to the air inlet 2014 extends obliquely toward the air inlet 2014. Specifically, indoor air enters the flue through the smoke inlet 4021, the air flows from bottom to top in the flue, one side of the micro-perforated plate 1 adjacent to the air inlet 2014 extends obliquely from bottom to top in the direction of the air inlet 2014, and the silencing assembly 100 plays a role in guiding the flow of air flow while silencing and reducing noise, so that the air flow in the flue more smoothly enters the fan 300 through the air inlet 2014. Thereby improving the efficiency of sucking the soot of the range hood 400.

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

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. 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 description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning 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 illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 do not necessarily 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.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A volute assembly for a centrifugal fan, comprising:

the volute comprises a front plate and a rear plate which are oppositely arranged in the front-rear direction, and a surrounding plate connected between the front plate and the rear plate, wherein the front plate, the rear plate and the surrounding plate jointly define an air outlet machine cavity, at least one of the front plate and the rear plate is provided with an air inlet, and the surrounding plate is provided with an air outlet;

a volute tongue component connected to the air outlet of the volute casing, a noise reduction component arranged on the inner wall surface of the volute tongue component,

the acoustic abatement assembly, comprising:

a microperforated plate provided with a plurality of microperforations that pass through in a thickness direction thereof, the plurality of microperforations being arranged so as to be spaced apart from each other;

a back plate, wherein a plurality of back cavities are arranged on the back plate, each back cavity is provided with a communication port, the micro-perforated plate is arranged on one side of the back plate, which is provided with the communication ports, the communication port of each back cavity is opposite to at least one micro-perforation, so that each back cavity is communicated with at least one micro-perforation,

the micro-perforated plate is formed into a plane plate-shaped structure, the back plate is formed into a wedge-shaped structure, the micro-perforated plate is attached to the inclined surface of the back plate,

the back plate is arranged towards the inner wall surface of the volute tongue component,

the volute tongue component comprises a volute tongue and an air guide section, the volute tongue is connected between the volute casing and the air guide section, the air guide section extends towards the direction far away from the volute tongue in an inclined mode, the inner wall surface of at least one of the volute tongue and the air guide section is provided with the noise reduction component,

the number in back of the body chamber is less than the number of micro-perforation, at least one the back of the body chamber is with a plurality of the micro-perforation intercommunication, wherein, it is a plurality of the micro-perforation is array distribution, is located a plurality of in same line the micro-perforation or be located a plurality of in the same column the micro-perforation, with same the back of the body chamber intercommunication, the micro-perforation board with the backplate can be dismantled continuously.

2. The volute assembly of a centrifugal fan of claim 1, wherein the microperforated sheet has a perforation rate ε of 5% or less, wherein the perforation rate ε is a ratio of a sum of areas of a plurality of the microperforations on the microperforated sheet to an area of the microperforations.

3. A centrifugal fan, comprising:

the volute assembly of any of claims 1-2;

the wind wheel is rotatably arranged in the fan cavity to drive airflow to flow from the air inlet to the air outlet.

4. A range hood, comprising:

the smoke exhaust device comprises a shell, wherein a smoke channel is formed in the shell and is provided with a smoke outlet;

the smoke collecting cover is internally provided with a smoke collecting cavity, the smoke collecting cavity is provided with a smoke inlet, the smoke collecting cover is arranged below the shell, and the smoke inlet is communicated with the flue;

the centrifugal fan as claimed in claim 3, wherein the centrifugal fan is disposed in the flue, the air inlet is communicated with the smoke inlet through the flue, and the air outlet is communicated with the smoke outlet.