CN105509119A - Noise reduction device and extractor hood - Google Patents

Abstract

The invention provides a noise reduction device and a range hood, wherein the noise reduction device includes: a noise reduction cover, the noise reduction cover is arranged in front of the volute of the range hood, and is located above the air inlet of the volute, and the noise reduction cover Filter holes are arranged on the noise cover to reduce the noise generated when the range hood is running. In the noise reduction device provided by the present invention, by setting filter holes on the noise reduction cover, the noise generated during the operation of the range hood can enter the noise reduction cover through the filter holes, and the noise spectrum will be reduced due to the small holes when passing through the filter holes. Noise reduction and shift to high frequency or ultra high frequency, thereby significantly reducing the audible sound components in the noise spectrum, reducing the interference and damage to the human body, thereby improving the user experience and increasing the market competitiveness of the product; in addition, The noise reduction device is arranged in front of the volute of the range hood and above the air inlet of the volute, so it will not block the air inlet of the volute and has almost no influence on the air performance of the range hood.

Description

Noise reduction device and range hood

technical field

The invention relates to the technical field of kitchen utensils, in particular to a noise reduction device and a range hood including the noise reduction device.

Background technique

With the improvement of the quality of life, users pay more and more attention to the operating noise of range hoods when purchasing range hoods. At the same time, domestic control standards for the operation noise of range hoods have also been improved. However, the high-volume range hoods currently on the market generally have the problem of high noise. In order to reduce the noise generated during the operation of the range hood, manufacturers usually use the method of filling porous sound-absorbing materials, but the porous sound-absorbing materials are not good for medium and high frequencies. The sound effect is good, but the low-frequency noise reduction effect is poor. For example, in the prior art, there is a design to reduce the noise of the range hood by wrapping the smoke pipe with sound-absorbing material, but this design can reduce the noise of the smoke pipe vibration, but the core noise source of the hood itself is aerodynamic and mechanical vibration. The noise is not significantly reduced, especially for low-frequency noise.

Contents of the invention

In order to solve at least one of the above technical problems, an object of the present invention is to provide a noise reduction device capable of effectively reducing the aerodynamic and mechanical vibration noise generated inside the range hood.

Another object of the present invention is to provide a range hood comprising the above noise reduction device.

In order to achieve the above object, the embodiment of the first aspect of the present invention provides a noise reduction device for a range hood, comprising: a noise reduction cover, the noise reduction cover is arranged in front of the volute of the range hood, And it is located above the air inlet of the volute, and the noise reduction cover is provided with filter holes for reducing the noise generated when the range hood is running.

In the noise reduction device provided by the embodiment of the first aspect of the present invention, by setting filter holes on the noise reduction cover, the noise generated during the operation of the range hood can enter the noise reduction cover through the filter holes, and the noise spectrum is filtered When the hole is opened, it will move to high frequency or ultra-high frequency because of the noise reduction of the small hole, thereby significantly reducing the audible sound component in the noise spectrum, that is, effectively reducing the noise generated by the pneumatic and mechanical vibration when the range hood is running, thus The interference and damage to the human body are reduced, thereby improving the user experience and increasing the market competitiveness of the product; in addition, the noise reduction device is arranged in front of the volute of the range hood and above the air inlet of the volute, so it does not It will block the air inlet of the volute and have little effect on the air performance of the range hood.

Specifically, the existing range hoods usually use porous sound-absorbing materials to reduce the noise generated during operation, but the porous sound-absorbing materials have good sound absorption effects on medium and high frequencies, but poor sound absorption effects on low frequencies, so they cannot effectively reduce oil absorption. The noise generated by the pneumatic and mechanical vibration inside the hood; and the noise reduction device provided by the present invention, by setting filter holes on the noise reduction cover, using the principle of small hole noise reduction to move the spectrum of the noise to high frequency or super High frequency, thus effectively reducing the middle and low frequency components in the noise spectrum, thus effectively reducing the audible components in the noise, greatly reducing the noise generated when the range hood is running, thereby improving the user experience and increasing the market for the product Competitiveness. Specifically, when the range hood is in operation, noises of different frequencies will be generated due to gas flow and mechanical vibration, and these noises will pass through the noise reduction device when propagating, and enter the noise reduction cover through the filter holes on the noise reduction cover, then When these noises of different frequencies pass through the filter hole, according to the principle of small hole noise reduction, the spectrum of the noise will shift to high frequency or ultra high frequency, so that the middle and low frequency components in the spectrum are significantly reduced, that is, the audible components are significantly reduced. Therefore, the noise generated by the pneumatic and mechanical vibration inside the range hood is effectively reduced, the user experience is improved, and the market competitiveness of the product is increased.

It can be understood that the small hole noise reduction can effectively control the aerodynamic noise to spread out, and has low-intermediate frequency broadband noise reduction performance, and the small aperture can improve the noise reduction coefficient, and the low porosity can increase the width of the sound absorption frequency band. The depth of the plate can change the position of the resonant sound absorption peak. Therefore, in actual production, the size and density of the filter holes and the thickness of the noise reduction cover should be designed according to the specific situation and product requirements.

In addition, the noise reduction device in the above embodiments provided by the present invention may also have the following additional technical features:

In the above technical solution, the noise reduction cover includes: a side wall, the side wall encloses an accommodating cavity with openings at both ends; and a bottom plate, the bottom plate is fixedly connected to the bottom end of the side wall, and The bottom port of the accommodating cavity is closed, wherein the filter hole is opened on the bottom plate.

In any one of the above technical solutions, the filter hole is opened on a plate body of the side wall facing the volute.

The noise reduction cover includes a side wall and a bottom plate. Most of the noise will enter the noise reduction cover through the bottom plate. Therefore, setting filter holes on the bottom plate can effectively reduce the noise generated when the range hood is running; Filter holes are also set on the plate body of the shell, and when a small part of the noise transmitted from the volute reaches the plate body of the noise reduction cover, it can also pass through the filter hole and enter the noise reduction cover, thereby reducing the noise in this part of the noise. The audible sound components further reduce the noise generated when the range hood is running, so as to further improve the noise reduction effect of the noise reduction device and further enhance the user experience.

In any one of the above technical solutions, the noise reduction device further includes: a sound absorbing part, the sound absorbing part is arranged in the accommodating cavity.

By filling the cavity with sound-absorbing parts, when the noise of different frequencies is transmitted to the noise reduction device, since there are a large number of filter holes evenly distributed on the noise reduction cover, according to the principle of small hole noise reduction, the spectrum of the noise will shift to high frequency or Ultra-high frequency, so that the audible sound components in the spectrum are significantly reduced; when the noise passes through the filter hole and enters the sound-absorbing parts in the noise reduction cover, because the sound-absorbing parts are made of porous sound-absorbing materials, part of the sound energy will be absorbed by the porous material. The friction in the pores is converted into heat energy and dissipated, further weakening the sound waves passing through the sound-absorbing parts; when the noise re-enters the air through the sound-absorbing parts, the change of the propagation medium will consume part of the sound energy; after these three processes After compound noise reduction, the audible noise generated by the gas flow and mechanical vibration during the operation of the range hood is greatly reduced, thereby significantly improving the user experience. As for the specific material of the sound-absorbing part, it can be one or more of metal fiber, centrifugal glass wool, sound-absorbing cotton or other porous materials.

In any of the above technical solutions, a gap is provided between the sound absorbing member and the bottom plate.

If there is a gap between the sound-absorbing part and the bottom plate, a part of the cavity will be formed between the sound-absorbing part and the bottom plate. When the noise enters the cavity through the filter hole, part of the sound energy can also be consumed due to the resonance effect of the cavity, thus The noise reduction effect of the noise reduction device is further improved, and the noise during operation of the range hood is further reduced. Of course, it is also possible to arrange the sound-absorbing member to stick to the bottom plate, which can also achieve the effect of noise reduction. Therefore, those skilled in the art should understand that this technical solution is also within the protection scope of the present invention.

In any of the above technical solutions, the bottom plate includes two arc-shaped plates, and the two arc-shaped plates are connected so that the bottom plate is M-shaped as a whole.

The base plate is designed as an M-shaped plate body connected by two arc-shaped plates. When the airflow rushes to the arc-shaped plate surface of the M-shaped base plate of the noise reduction device, the arc-shaped plate surface can play a role in drainage and slow down the impact of the airflow. This further reduces the aerodynamic noise generated by the impact of the airflow, thereby further improving the noise reduction effect of the noise reduction device; in addition, the M-shaped bottom plate can also improve the flow efficiency of the airflow, thereby improving the range hood's oil extraction efficiency. Furthermore, the sound-absorbing part is also designed in an M-shape, so as to be consistent with the shape of the bottom plate, so as to facilitate the installation of the sound-absorbing part.

In any of the above technical solutions, the filter hole is a circular hole, and the diameter of the circular hole is 1-10 mm.

The filter hole is designed as a round hole, and the diameter of the round hole is controlled within the range of 1 to 10mm, which can ensure that the filter hole can effectively eliminate the noise generated by the range hood when the range hood is running, so as to keep the range hood running When the frequency spectrum of different frequency noise is shifted to high frequency or ultra high frequency spectrum, the audible sound components in the frequency spectrum are significantly reduced. Preferably, the diameter of the circular hole is 3-8mm. Of course, those skilled in the art should understand that the filter hole can also adopt other shapes, such as triangle, rhombus, etc., which will not be listed here, as long as the size is controlled within a certain range, they can all play the role of small hole noise reduction. effect, all can realize the object of the present invention, therefore all within the protection scope of the present invention.

The embodiment of the second aspect of the present invention provides a range hood, comprising: a frame, the frame includes a top plate and a front plate; a volute, the volute is arranged in the frame, and Behind the front plate, the volute has an air inlet; the impeller is arranged in the volute; and the noise reduction device according to any one of the embodiments of the first aspect, the noise reduction device is arranged in Between the front plate and the volute, and the noise reduction device is fixed on the front plate and located above the air inlet.

The range hood provided by the embodiment of the second aspect of the present invention is provided with the noise reduction device described in any one of the embodiments of the first aspect, so the noise generated due to gas flow and mechanical vibration during operation is significantly reduced, Thereby enhancing the user experience and increasing the market competitiveness of the product. Specifically, the noise reduction device is arranged between the front plate of the frame and the volute, that is, in front of the volute, and above the air inlet of the volute, so that it will not block the air inlet and has almost no effect on the air circulation inside the range hood. No effect; when the fan inside the range hood is running, the noise generated by the gas flow and mechanical vibration will be filtered and absorbed by the noise reduction device, so that the audible sound components in the spectrum will be significantly reduced, thereby reducing the Interference and damage to the human body; at the same time, the bottom plate of the noise reduction cover is designed in an M shape, which can drain the airflow, slow down the impact of the airflow and improve the flow efficiency of the airflow. As for the specific installation method of the noise reduction device, it can be screwed, riveted or provided with a bracket connection, etc., all of which can have the effect of fixing the noise reduction device, and are all within the protection scope of the present invention.

In addition, the range hoods in the above embodiments provided by the present invention may also have the following additional technical features:

In the above technical solution, the top end of the noise reduction cover of the noise reduction device is attached to the top board, and the distance between the sound absorbing part of the noise reduction device and the top board is 15-30 mm.

The top of the noise reduction hood where the noise reduction device is installed fits closely with the lower surface of the top plate of the rack, and the distance between the sound-absorbing parts of the noise-reduction device and the top plate is controlled within the range of 15-30mm. There is a gap between the top plates, so the noise can continue to spread into the air after passing through the sound-absorbing parts, so as to change the propagation medium, further consume sound energy, and improve user comfort; on the other hand, on the premise of not blocking the air inlet, The height of the noise reduction cover can be relatively extended, thereby increasing the number of filter holes and the thickness of the sound-absorbing part, so as to further improve the noise reduction effect of the noise reduction device.

In any of the above technical solutions, the bottom plate of the noise reduction cover of the noise reduction device includes two asymmetric arc-shaped plates, and the two arc-shaped plates are connected to make the bottom plate overall M-shaped, wherein the two The intersection line of the two arc-shaped plates is parallel to the central axis of the impeller, and the plane where the intersection line and the central axis of the impeller is located is perpendicular to the top plate.

The bottom plate of the noise reduction cover is designed as an M-shaped connection of two arc-shaped plates, so that when the airflow hits the bottom plate of the noise reduction device, the bottom plate can play an effective drainage role, preventing the airflow from forming a vortex and stagnation, making the smoke Quickly enter the air inlet and discharge it, thereby improving the effect of the range hood; at the same time, the curved surface of the M-shaped bottom plate can play a role in buffering the impact of the airflow, thereby reducing the aerodynamic noise generated by the impact of the airflow, and further reducing The noise generated when the range hood is running; furthermore, due to the limitation of the shape of the volute itself, its air inlet is generally not located in the middle of the frame, so two arc-shaped plates are set asymmetrically, and the two arc-shaped plates The intersection line is parallel to the central axis of the impeller, and the plane where the two are located is vertical to the top plate, that is, the intersection line of the two arc-shaped plates and the central axis of the impeller are in the same vertical plane, so that the drainage effect of the noise reduction cover and The effect of slowing down the impact of the airflow is optimized, thereby further reducing the noise when the range hood is running. Of course, the two arc-shaped plates can also be designed to be symmetrical or asymmetrical, but the intersection line of the two arc-shaped plates and the central axis of the impeller are not located in the same vertical plane, and the invention can also be realized. purpose, and do not deviate from the design idea and purpose of the present invention, therefore, those skilled in the art should understand that these technical solutions are also within the protection scope of the present invention.

Additional aspects and advantages of the invention will become apparent in the description which follows, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic diagram of an exploded structure of a range hood according to an embodiment of the present invention;

Fig. 2 is a front structural schematic diagram of the range hood shown in Fig. 1 (decorative cover and front panel are removed);

Fig. 3 is a schematic cross-sectional structural view of the range hood shown in Fig. 1;

Fig. 4 is a partial structural schematic diagram of the range hood shown in Fig. 1 .

Wherein, the corresponding relationship between reference numerals and component names in Fig. 1 to Fig. 4 is:

1 range hood, 10 noise reduction device, 11 noise reduction cover, 111 side panel, 112 bottom plate, 113 filter hole, 12 sound-absorbing parts, 20 frame, 21 top plate, 22 front plate, 30 volute, 40 impeller, 50 Decorative cover, 60 check valve;

Wherein, the arrow in the figure indicates the propagation direction of the noise.

detailed description

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

A noise reduction device and a range hood according to some embodiments of the present invention will be described below with reference to FIGS. 1 to 4 .

As shown in FIGS. 1 to 4 , the embodiment of the first aspect of the present invention provides a noise reduction device 10 for a range hood 1 , including: a noise reduction cover 11 .

Specifically, the noise reduction cover 11 is arranged in front of the volute 30 of the range hood 1, and is located above the air inlet of the volute 30, and the noise reduction cover 11 is provided with a filter hole 113 for reducing the range hood 1. noise produced.

The noise reduction device 10 provided by the embodiment of the first aspect of the present invention, by setting the filter hole 113 on the noise reduction cover 11, uses the principle of small hole noise reduction to move the spectrum of the noise to high frequency or ultra high frequency, thereby effectively The middle and low frequency components in the noise spectrum are reduced, thereby effectively reducing the audible components in the noise, so that the noise generated during the operation of the range hood 1 is greatly reduced, thereby improving the user experience and increasing the market competitiveness of the product. Specifically, when the range hood 1 is in operation, noises of different frequencies will be generated due to gas flow and mechanical vibration, and these noises will pass through the noise reduction device 10 during transmission, and enter the noise reduction device 11 through the filter hole 113 on the noise reduction cover 11. Noise cover 11, when the noise of these different frequencies passes through the filter hole 113, according to the principle of small hole noise reduction, the spectrum of the noise will move to high frequency or ultra high frequency, so that the middle and low frequency components in the spectrum are significantly reduced, that is, The listening sound component is significantly reduced, thereby effectively reducing the noise generated by the pneumatic and mechanical vibration inside the range hood 1, improving the user experience, and increasing the market competitiveness of the product.

It can be understood that the small hole noise reduction can effectively control the aerodynamic noise to spread out, and has low-intermediate frequency broadband noise reduction performance, and the small aperture can improve the noise reduction coefficient, and the low porosity can increase the width of the sound absorption frequency band. The depth of the plate can change the position of the resonant sound absorption peak. Therefore, in actual production, the size and density of the filter holes 113 and the thickness of the noise reduction cover 11 should be designed according to specific conditions and product requirements.

In one embodiment of the present invention, as shown in FIGS. 1 to 4 , the noise reduction cover 11 includes: a side wall 111 and a bottom plate 112 .

Specifically, the side panel 111 encloses a receiving cavity with open ends; the bottom plate 112 is fixedly connected to the bottom of the side panel 111 and closes the bottom port of the receiving cavity, wherein the bottom plate 112 is provided with a filter hole 113 .

Preferably, as shown in FIG. 1 , a filter hole 113 is opened on the body of the side wall 111 facing the volute 30 .

In this embodiment, the noise reduction cover 11 includes a side panel 111 and a bottom plate 112. Most of the noise will enter the noise reduction cover 11 through the bottom plate 112. Therefore, a filter hole 113 is provided on the bottom plate 112, which can effectively reduce the range hood 1. Further, filter holes 113 are also provided on the side wall 111 towards the plate body of the volute 30, so that when a small part of the noise transmitted from the volute 30 reaches the part of the plate body of the noise reduction cover 11 , can also enter the noise reduction cover 11 through the filter hole 113, thereby reducing the audible sound component in this part of the noise, further reducing the noise generated when the range hood 1 is running, so as to further improve the noise reduction effect of the noise reduction device 10 , to further enhance the user experience.

In one embodiment of the present invention, as shown in FIG. 1 , the noise reducing device 10 further includes: a sound absorbing member 12 , and the sound absorbing member 12 is disposed in the accommodation cavity.

In this embodiment, by filling the accommodating cavity with sound-absorbing components 12, when the noise of different frequencies propagates to the noise reduction device 10, since a large number of filter holes 113 are evenly distributed on the noise reduction cover 11, according to the principle of small hole noise reduction , the spectrum of the noise will move to high frequency or ultra high frequency, so that the audible sound components in the spectrum will be significantly reduced; It is made of sound-absorbing material, so a part of the sound energy will be converted into heat energy and dissipated in the pores of the porous material, so that the sound wave passing through the sound-absorbing part 12 is further weakened; when the noise propagates into the air again through the sound-absorbing part 12, the propagation medium The change will consume part of the sound energy; after the compound noise reduction of these three processes, the audible noise generated by the gas flow and mechanical vibration during the operation of the range hood 1 is greatly reduced, thereby significantly improving the user experience.

As for the specific material of the sound-absorbing member 12, it may be one or more of metal fiber, centrifugal glass wool, sound-absorbing cotton or other porous materials.

Preferably, a gap is provided between the sound absorbing member 12 and the bottom plate 112 .

In this embodiment, if there is a gap between the sound-absorbing part 12 and the bottom plate 112, a part of the cavity will be formed between the sound-absorbing part 12 and the bottom plate 112. When the noise enters the cavity through the filter hole 113, due to cavity resonance Effect, can also consume part of the sound energy, thereby further improving the noise reduction effect of the noise reduction device 10, and further reducing the noise of the range hood 1 during operation.

Of course, the sound-absorbing component 12 can also be attached to the bottom plate 112 , which can also achieve the effect of noise reduction. Therefore, those skilled in the art should understand that this technical solution is also within the protection scope of the present invention.

In one embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 4 , the bottom plate 112 includes two arc-shaped plates, and the two arc-shaped plates are connected so that the bottom plate 112 is M-shaped as a whole.

In this embodiment, the base plate 112 is designed as an M-shaped plate body connected by two arc-shaped plates, and when the airflow rushes to the arc-shaped plate surface of the M-shaped base plate 112 of the noise reduction device 10, the arc-shaped plate surface can play a role. To drain and slow down the impact of the airflow, thereby reducing the aerodynamic noise generated by the impact of the airflow, thereby further improving the noise reduction effect of the noise reduction device 10; in addition, the M-shaped bottom plate 112 can also improve the flow efficiency of the airflow, thereby improving the oil absorption fume The range fume efficiency of machine 1.

Further, the sound-absorbing member 12 is also designed in an M-shape to keep consistent with the shape of the bottom plate 112 , so as to facilitate the installation of the sound-absorbing member 12 .

In any embodiment of the present invention, the filter hole 113 is a circular hole, and the diameter of the circular hole is 1-10 mm.

In the above embodiment, the filter hole 113 is designed as a circular hole, and the diameter of the circular hole is controlled within the range of 1-10 mm, which can ensure that the filter hole 113 acts as an effective small hole for the noise generated when the range hood 1 is running. The function of noise reduction is to shift the frequency spectrum of the noise of different frequencies generated during the operation of the range hood 1 to the high-frequency or ultra-high frequency spectrum, so that the audible sound components in the frequency spectrum are obviously reduced.

Preferably, the diameter of the circular hole is 3-8 mm.

Of course, those skilled in the art should understand that the filter hole 113 can also adopt other shapes, such as triangle, rhombus, etc., which will not be listed here, as long as its size is controlled within a certain range, it can play the role of small hole noise reduction. The effect of all can realize the purpose of the present invention, therefore all within the scope of protection of the present invention.

As shown in Figures 1 to 4, the range hood 1 provided by the embodiment of the second aspect of the present invention includes: a frame 20, a volute 30, an impeller 40, and any noise reduction in the embodiment of the first aspect device 10.

Specifically, the frame 20 includes a top plate 21 and a front plate 22; the volute 30 is arranged in the frame 20 and is positioned behind the front plate 22, and the volute 30 has an air inlet; the impeller 40 is arranged in the volute 30; the noise reduction device 10 is set between the front plate 22 and the volute 30, and the noise reduction device 10 is fixed on the front plate 22, and is located above the air inlet; the top plate 21 is also provided with a check valve 60, the check valve 60 and the volute 30 connected; the front panel 22 is also provided with a decorative cover 50 .

The range hood 1 provided by the embodiment of the second aspect of the present invention is provided with the noise reduction device 10 of any one of the embodiments of the first aspect, so the noise generated due to gas flow and mechanical vibration during operation is significantly reduced, Thereby enhancing the user experience and increasing the market competitiveness of the product. Specifically, the noise reduction device 10 is arranged between the front plate 22 of the frame 20 and the volute 30, that is, it is arranged in front of the volute 30, and is located above the air inlet of the volute 30, so that the air inlet will not be blocked, and the oil fume The air circulation inside the range hood 1 is almost unaffected; when the fan in the range hood 1 is running, the noise generated by the gas flow and mechanical vibration, after passing through the noise reduction device 10, the middle and low frequency noise is filtered and absorbed, so that the audible The sound component is significantly reduced, thereby reducing the interference and damage to the human body; meanwhile, the bottom plate 112 of the noise reduction cover 11 is designed in an M shape, which can drain the airflow, slow down the impact of the airflow and improve the flow efficiency of the airflow.

As for the specific installation method of the noise reduction device 10, it can be screwed, riveted or provided with a bracket connection, etc., all of which can achieve the effect of fixing the noise reduction device 10, and are within the protection scope of the present invention.

Preferably, as shown in Figures 2 to 4, the top of the noise reduction cover 11 of the noise reduction device 10 is attached to the top plate 21, and the distance between the sound absorbing part 12 of the noise reduction device 10 and the top plate 21 is 15-30 mm .

In this embodiment, the top of the noise reduction cover 11 of the noise reduction device 10 is set to be attached to the lower surface of the top plate 21 of the frame 20, and the distance between the sound absorbing member 12 of the noise reduction device 10 and the top plate 21 is controlled at 15 Within the range of ~30mm, on the one hand, it ensures that there is a gap between the sound-absorbing part 12 and the top plate 21, so that the noise can continue to spread into the air after passing through the sound-absorbing part 12, so as to change the propagation medium, further consume sound energy, and improve user experience. Comfort; on the other hand, under the premise of not blocking the air inlet, the height of the noise reduction cover 11 can be relatively extended, thereby increasing the number of filter holes 113 and the thickness of the sound-absorbing member 12, so as to further improve the noise reduction of the noise reduction device 10 Effect.

In one embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 4 , the bottom plate 112 of the noise reduction cover 11 of the noise reduction device 10 includes two asymmetric arc-shaped plates, and the two arc-shaped plates are connected. The bottom plate 112 is M-shaped as a whole, wherein the intersection line of the two arc-shaped plates is parallel to the central axis of the impeller 40 , and the intersection line and the plane where the central axis of the impeller 40 is located are perpendicular to the top plate 21 .

In this embodiment, the bottom plate 112 of the noise reduction cover 11 is designed as an M-shaped connection of two arc-shaped plates, and when the airflow hits the bottom plate 112 of the noise reduction device 10, the bottom plate 112 can play an effective role in drainage, Avoid the stagnation of the vortex formed by the air flow, so that the smoke quickly enters the air inlet and is discharged, thereby improving the effect of the range hood 1 on the range hood 1; at the same time, the arc-shaped surface of the M-shaped bottom plate 112 can play a role in buffering the impact of the air flow. Furthermore, the aerodynamic noise generated by the impact of the airflow is reduced, and the noise generated when the range hood 1 is in operation is further reduced.

Further, due to the limitation of the shape of the volute 30 itself, its air inlet generally will not be located in the middle of the frame 20, so the two arc-shaped plates are arranged asymmetrically, and the intersection line of the two arc-shaped plates is in line with the center of the impeller 40. The axes are parallel, and the plane where the two are located is vertical to the top plate 21, that is, the intersection line of the two arc-shaped plates and the central axis of the impeller 40 are located in the same vertical plane, so that the drainage effect of the noise reduction cover 11 and the impact of the airflow can be slowed down. The effect is optimized, thereby further reducing the noise of the range hood 1 during operation.

Of course, the two arc-shaped plates can also be designed to be symmetrical or asymmetrical, but the intersection line of the two arc-shaped plates and the central axis of the impeller 40 are not located in the same vertical plane, and the present invention can also be realized purpose, without departing from the design idea and purpose of the present invention, therefore, those skilled in the art should understand that these technical solutions are also within the protection scope of the present invention.

To sum up, the noise reduction device provided by the present invention sets filter holes on the noise reduction cover so that the noise generated during the operation of the range hood can enter the noise reduction cover through the filter holes, and the noise spectrum passes through the filter holes When the sound is eliminated by the small hole, it will move to high frequency or ultra high frequency, thereby significantly reducing the audible sound components in the noise spectrum, that is, effectively reducing the noise generated by the pneumatic and mechanical vibration when the range hood is running, thereby reducing the noise. Minimize the interference and damage to the human body, thereby improving the user experience and increasing the market competitiveness of the product; in addition, the noise reduction device is set in front of the volute of the range hood and above the air inlet of the volute, so it will not Covering the air inlet of the volute has almost no influence on the air performance of the range hood.

Specifically, the existing range hoods usually use porous sound-absorbing materials to reduce the noise generated during operation, but the porous sound-absorbing materials have good sound absorption effects on medium and high frequencies, but poor sound absorption effects on low frequencies, so they cannot effectively reduce oil absorption. The noise generated by the pneumatic and mechanical vibration inside the hood; and the noise reduction device provided by the present invention, by setting filter holes on the noise reduction cover, using the principle of small hole noise reduction to move the spectrum of the noise to high frequency or super High frequency, thus effectively reducing the middle and low frequency components in the noise spectrum, thus effectively reducing the audible components in the noise, greatly reducing the noise generated when the range hood is running, thereby improving the user experience and increasing the market for the product Competitiveness. Specifically, when the range hood is in operation, noises of different frequencies will be generated due to gas flow and mechanical vibration, and these noises will pass through the noise reduction device when propagating, and enter the noise reduction cover through the filter holes on the noise reduction cover, then When these noises of different frequencies pass through the filter hole, according to the principle of small hole noise reduction, the spectrum of the noise will shift to high frequency or ultra high frequency, so that the middle and low frequency components in the spectrum are significantly reduced, that is, the audible components are significantly reduced. Therefore, the noise generated by the pneumatic and mechanical vibration inside the range hood is effectively reduced, the user experience is improved, and the market competitiveness of the product is increased.

In the present invention, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more than two, unless otherwise Clearly defined. The terms "installation", "connection", "connection", "fixed" and other terms should be interpreted in a broad sense, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear" etc. is based on the orientation or positional relationship shown in the drawings, and is only for convenience The present invention is described and simplified descriptions do not indicate or imply that the referred device or unit must have a specific orientation, be constructed and operate in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the present invention In at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A noise reduction device for a range hood, characterized in that it comprises: A noise reduction cover, the noise reduction cover is arranged in front of the volute of the range hood and above the air inlet of the volute, and the noise reduction cover is provided with filter holes for reducing the The noise produced by the range hood when it is running. 2. The noise reducing device according to claim 1, characterized in that, The noise reduction cover includes: a side wall, the side wall enclosing a receiving chamber open at both ends; and A bottom plate, the bottom plate is fixedly connected to the bottom end of the side panel, and closes the bottom port of the accommodating cavity, wherein the filter hole is opened on the bottom plate. 3. The noise reduction device according to claim 2, characterized in that, The filter hole is opened on the body of the side wall facing the volute. 4. The noise reduction device according to claim 2, further comprising: A sound-absorbing piece, the sound-absorbing piece is arranged in the accommodating cavity. 5. The noise reduction device according to claim 4, characterized in that, There is a gap between the sound absorbing part and the bottom plate. 6. The noise reducing device according to any one of claims 2 to 5, characterized in that, The bottom plate includes two arc-shaped plates, and the two arc-shaped plates are connected so that the bottom plate is M-shaped as a whole. 7. The noise reducing device according to claim 6, characterized in that, The filter hole is a circular hole, and the diameter of the circular hole is 1-10mm. 8. A range hood, characterized in that it comprises: a frame comprising a top plate and a front plate; A volute, the volute is arranged in the frame and behind the front plate, the volute has an air inlet; an impeller disposed within the volute; and The noise reduction device according to any one of claims 1 to 7, wherein the noise reduction device is arranged between the front plate and the volute, and the noise reduction device is fixed on the front plate, And located above the air inlet. 9. The range hood according to claim 8, characterized in that, The top end of the noise reduction cover of the noise reduction device is attached to the top board, and the distance between the sound absorbing part of the noise reduction device and the top board is 15-30 mm. 10. The range hood according to claim 8, characterized in that: The bottom plate of the noise reduction cover of the noise reduction device includes two asymmetric arc-shaped plates, and the two arc-shaped plates are connected to make the bottom plate overall M-shaped, wherein the intersection of the two arc-shaped plates The line is parallel to the central axis of the impeller, and the intersection line and the plane where the central axis of the impeller is perpendicular to the top plate.