CN209744446U - Range hood exhaust nozzle pipe with noise interference device - Google Patents
Range hood exhaust nozzle pipe with noise interference device Download PDFInfo
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- CN209744446U CN209744446U CN201821969150.3U CN201821969150U CN209744446U CN 209744446 U CN209744446 U CN 209744446U CN 201821969150 U CN201821969150 U CN 201821969150U CN 209744446 U CN209744446 U CN 209744446U
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Abstract
The utility model provides a take lampblack absorber exhaust nozzle pipe of noise interference device, is provided with the exhaust nozzle pipe main part that is used for connecting fan and blast pipe and is used for reducing the noise interference device of multifrequency noise, and the noise interference device assembles in exhaust nozzle pipe main part. The noise interference device is provided with a first opening and a second opening, the first opening and the second opening are respectively communicated with the air duct of the exhaust nozzle pipe main body, and the horizontal positions of the first opening and the second opening are different. The range hood can keep a good noise reduction effect for a long time, and the noise interference device has the advantages of low cost and high reliability. The noise interference device is mutually interfered with the noise transmitted in the air duct pipe through the resonance amplitude and the phase position of the specific noise frequency so as to reduce the amplitude of the noise frequency, and the noise reduction of the specific multi-frequency noise is realized. The noise interference device is made of corrosion-resistant, chemical-resistant and not easy to damage.
Description
Technical Field
The utility model relates to a lampblack absorber field, in particular to take noise to interfere lampblack absorber exhaust nozzle pipe of device.
background
The hearing of people is often damaged when the users are in a high-noise environment for a long time, and the emotional problems of the users are caused when the users are in the noise environment for a long time. Along with the improvement of the life quality of people, the tolerance of people to noise is lower and lower. Therefore, the noise reduction of the range hood is more and more emphasized.
Noise reduction of a range hood in the prior art is realized mostly by an active noise reduction mode and a passive noise reduction mode. The active noise reduction mode only can act on the noise with the frequency within 1000Hz, and the noise more than 1000Hz can be processed only by a passive noise reduction technology. Passive noise reduction, however, is primarily achieved by wrapping the noise source or duct with sound absorbing cotton. But has several disadvantages as follows: firstly, the air pressure loss is too large, noise and fluid need to penetrate through the sound absorption cotton, sound energy is lost by friction, the noise reduction effect is achieved, and meanwhile, the air performance is reduced. Secondly, it is difficult to select proper sound-absorbing cotton, and few supply factories can provide data of sound absorption rate of sound-absorbing cotton under different frequencies, so manufacturers of range hoods can only find out proper type or thickness of sound-absorbing cotton in continuous trial and error. Thirdly, the noise reduction frequency of the sound absorption cotton is uncontrollable, the common sound absorption cotton cannot achieve the maximum noise reduction effect under the specified narrow frequency, and different strategies cannot be mutually matched in design to effectively reduce noise.
therefore, aiming at the defects of the prior art, the exhaust nozzle pipe of the range hood with the noise interference device is necessary to solve the defects of the prior art.
SUMMERY OF THE UTILITY MODEL
One of the purposes of the utility model is to avoid the defects of the prior art and provide a range hood exhaust nozzle pipe with a noise interference device. The exhaust nozzle pipe of the range hood with the noise interference device can reduce specific multi-frequency noise.
the above object of the present invention is achieved by the following technical measures:
the utility model provides a take lampblack absorber exhaust nozzle pipe of noise interference device is provided with the exhaust nozzle pipe main part that is used for connecting fan and blast pipe and is used for reducing the noise interference device of multifrequency noise, and the noise interference device assembles in exhaust nozzle pipe main part.
Preferably, the noise interference device is provided with a first opening and a second opening, the first opening and the second opening are respectively communicated with the air duct of the exhaust nozzle pipe main body, and the horizontal positions of the first opening and the second opening are different.
Preferably, the length of the noise interference device is defined as La, and 0 < La ≦ 1000 mm.
Preferably, the shortest distance between K1 and K2 is defined as Δ L, and La > Δ L > 5 mm.
Preferably, the noise interference device reduces noise of the specific multi-frequency noise by adjusting an area of the first opening and the second opening, an entire length of the noise interference device, or a shortest distance between the first opening and the second opening.
The first opening is defined as K1, the area of K1 is defined as M1, the second opening is defined as K2, the area of K2 is defined as M2, the area of the air inlet of the air duct is defined as K3, the area of K3 is defined as M3, the area of the air outlet of the air duct is defined as K4, the area of K4 is defined as M4, and M1 is equal to M2, and M3 is equal to M4.
Preferably, a first through hole is formed at a communication position of the air duct and the noise interference device.
Preferably, the first through hole is provided in plural.
Preferably, the first through hole has at least one of a circular shape, an oval shape, a triangular shape, a square shape, a rectangular shape, a pentagonal shape, a hexagonal shape, a rhombic shape, and an irregular shape.
Preferably, the cross-sectional shape of the noise interference device is a circle, an ellipse, a rectangle, a triangle, a diamond, or any shape other than the above.
Preferably, the noise interference device is provided in plurality.
Preferably, the exhaust nozzle pipe body is provided with a noise filter, and the noise filter is mounted on an inner surface of the air duct.
Preferably, the noise filter is configured as a panel having a plurality of second through holes for removing multi-frequency noise distributed therein.
Preferably, the aperture of the second through hole is defined as d, and d is less than or equal to 30 mm.
Preferably, the minimum distance between the edge of the second through hole and the edge of the adjacent second through hole is b, and b is an arbitrary value greater than 0.
Preferably, the value of d is plural.
Preferably, a plurality of values of b are used.
Preferably, the noise filter device reduces noise of specific single-frequency noise or multi-frequency noise by adjusting the aperture of different second through holes or the minimum distance between the edge of a second through hole and the edge of an adjacent second through hole or the distance between the noise filter device and the exhaust nozzle pipe body.
Preferably, a gap is formed between the noise filter and the inner surface of the air duct, and the distance of the gap is defined as H1.
Preferably, the exhaust nozzle pipe main body is further provided with a sound absorbing portion, and the sound absorbing portion is fixedly fitted to the gap.
Preferably, the thickness of the sound absorbing part is defined as H2, and H2 is not more than 0.6H 1.
Preferably, the sound absorbing member is made of a fiber, PP cotton, polyester fiber, carbon fiber, or porous foam.
The utility model discloses a take noise to interfere lampblack absorber exhaust nozzle pipe of device is provided with the exhaust nozzle pipe main part that is used for connecting fan and blast pipe and is used for reducing the noise interference device of multifrequency noise, and the noise interference device assembles in exhaust nozzle pipe main part. The noise interference device is provided with a first opening and a second opening, the first opening and the second opening are respectively communicated with the air duct of the exhaust nozzle pipe main body, and the horizontal positions of the first opening and the second opening are different. The utility model discloses noise interferes the device and interferes whole length or the shortest distance of first trompil and second trompil of device through the area, the noise of the first trompil of adjustment and second trompil and reach the making an uproar of falling of specific multifrequency noise. The range hood can keep a good noise reduction effect for a long time, and the noise interference device has the advantages of low cost and high reliability. The noise interference device is mutually interfered with the noise transmitted in the air duct pipe through the resonance amplitude and the phase position of the specific noise frequency so as to reduce the amplitude of the noise frequency, and the noise reduction of the specific multi-frequency noise is realized. The noise interference device is made of corrosion-resistant, chemical-resistant and not easy to damage.
Drawings
The present invention will be further described with reference to the accompanying drawings, but the contents in the drawings do not constitute any limitation to the present invention.
Fig. 1 is a schematic structural diagram of an exhaust nozzle pipe of a range hood with a noise interference device in embodiment 1.
fig. 2 is a schematic cross-sectional view of fig. 1.
Fig. 3 is a schematic diagram of the length La of the noise interference device of fig. 2 and the shortest distance Δ L of K1 and K2.
Fig. 4 is a schematic diagram of the shape of the cross section of the noise interference device, where (1) in fig. 4 is a circle, (2) in fig. 4 is an ellipse, (3) in fig. 4 is a rectangle, (4) in fig. 4 is a triangle, (5) in fig. 4 is a diamond, (6) in fig. 4 is an arbitrary shape, (7) in fig. 4 is an arbitrary shape, and (8) in fig. 4 is an arbitrary shape.
Fig. 5 is a schematic structural view of an exhaust nozzle pipe of the range hood with the noise interference device in embodiment 2.
fig. 6 is a schematic structural view of an exhaust nozzle pipe of the range hood with the noise interference device of the embodiment 3.
Fig. 7 is a schematic structural view of an exhaust nozzle pipe of the range hood with the noise interference device of embodiment 4.
Fig. 8 is an enlarged view of the region z in fig. 7.
Fig. 9 is a schematic structural diagram of the noise filtering apparatus in fig. 7.
Fig. 10 is a schematic diagram of the aperture of the second through hole and the relationship between the edge of the second through hole and the minimum distance between the edge of the adjacent second through hole in fig. 9.
In fig. 1 to 10, the following components are included:
A noise interference device 1,
An exhaust nozzle pipe body 2, a first through hole 21,
A noise filter 3, a second through hole 31,
A sound absorbing part 4,
And an exhaust pipe 5.
Detailed Description
The technical solution of the present invention will be further explained by the following examples.
Example 1.
A range hood exhaust nozzle pipe with a noise interference device 1, as shown in FIGS. 1 to 4, is provided with an exhaust nozzle pipe main body 2 for connecting a fan and an exhaust pipe 5 and a noise interference device 1 for reducing multi-frequency noise, the noise interference device 1 being assembled to the exhaust nozzle pipe main body 2.
The noise interference device 1 is provided with a first opening and a second opening inside, the first opening and the second opening are respectively communicated with the air duct of the exhaust nozzle pipe main body 2, and the horizontal positions of the first opening and the second opening are different.
The first opening is defined as K1, the area of K1 is defined as M1, the second opening is defined as K2, the area of K2 is defined as M2, the area of the air inlet of the air duct is defined as K3, the area of K3 is defined as M3, the area of the air outlet of the air duct is defined as K4, the area of K4 is defined as M4, and M1 is equal to M2, and M3 is equal to M4. The utility model discloses the air intake of exhaust nozzle pipe is connected with the fan (the attached drawing is not shown) air outlet of lampblack absorber, and the air outlet and the blast pipe 5 of exhaust nozzle pipe are connected.
the utility model discloses a can M1 be M2, M3 be M4, also can M1 be not equal M2, M3 be not equal M4. In this embodiment, M1 ≠ M2, and M3 ≠ M4. The advantage of M3 ≠ M4 is that it is possible to adapt the exhaust nozzle tube better to the structure of the external hood.
The noise interference device 1 achieves noise reduction of a specific multi-frequency noise by adjusting the areas of the first and second openings, the entire length of the noise interference device 1, or the shortest distance of the first and second openings. The length of the noise interference device 1 is defined as La, and La is more than 0 and less than or equal to 1000 mm. The shortest distance between K1 and K2 is defined as Δ L, and La > Δ L > 5 mm. M1 ═ M2, M3 ═ M4.
The cross section of the noise interference device 1 of the present invention is preferably circular, and may be oval, rectangular, triangular, rhombic, or any shape other than the above shapes, and the specific cross section is determined according to the actual situation.
The cross section of the noise interference device 1 of the present invention is circular, as shown in (1) in fig. 4.
The cross section of the noise interference device 1 of the present invention is elliptical, as shown in (2) in fig. 4.
The cross section of the noise interference device 1 of the present invention is rectangular, as shown in (3) in fig. 4. It should be noted that the rectangle in the present invention is not limited to the rectangle shown in (3) in fig. 4, and other rectangles also meet the requirement of the rectangle in the present invention, and are also within the protection scope of the present invention.
The cross section of the noise interference device 1 of the present invention is triangular, as shown in (4) in fig. 4.
The cross section of the noise interference device 1 of the present invention is a diamond shape, as shown in (5) in fig. 4.
the cross section of the noise interference device 1 of the present invention is an arbitrary shape as shown in (6) in fig. 4, (7) in fig. 4, and (8) in fig. 4. It should be noted that the arbitrary shape in the present invention is not limited to the 3 rectangles of fig. 4 (6), fig. 4 (7) and fig. 4 (8), and other arbitrary shapes also meet the requirements of the arbitrary shape of the present invention, and are also within the scope of the present invention.
The cross section of the noise interference device 1 is in a shape without an edge angle, such as a circle or an ellipse, so that the loss of the energy of the sound wave in the noise interference device 1 can be reduced, the effect of the sound wave interference with a noise source is improved, and the noise reduction effect is further improved.
The principle of the utility model is that: the noise interference device 1(Herschel-Quincke tube) achieves a sound reduction effect according to interference between sound waves. The noise interference device 1 achieves the effect of reducing sound according to resonance and interference between sound waves. Because the noise interference device 1 has a plurality of resonance frequencies: f0,1, f0,2, fs1 and fs 2. Wide-frequency noise waves generated by the range hood are transmitted in the main air duct 2, and when encountering a noise interference device, the wide-frequency noise waves are divided into a first wide-frequency noise wave and a second wide-frequency noise wave, and the first wide-frequency noise wave is continuously transmitted in the main air duct 2; the second path of wide-frequency noise wave enters the noise interference device 1, resonates with the noise interference device 1, and exits from one of the openings of the noise interference device and enters the main air duct 2. When the second wide frequency noise wave has the same or similar frequency as f0,1, f0,2, fs1, and fs2, the second wide frequency noise wave enters the noise interference device 1 and resonates with the noise interference device 1, and exits one of the openings of the noise interference device 1 to merge into the main duct. After being converged into the main air duct 2, a first path of wide-frequency noise wave transmitted from the noise interference device 1 has a phase difference with a second path of wide-frequency noise wave transmitted by the main air duct 2, the first path of wide-frequency noise wave and the second path of wide-frequency noise wave interfere to form an interference wide-frequency noise wave, and the amplitude of the interference wide-frequency noise wave relative to the wide-frequency noise wave is weakened and the noise is reduced.
The main frequency of the noise reduction of the target of the noise interference device 1 is related to a function of the sound velocity c, the length La of the noise interference device 1 and the inverse of the shortest distance Δ L of K1 and K2 of the noise interference device 1, as follows:
where F is the main frequency of the noise interference device 1 for target noise reduction, and F is the function expression symbol. The specific expression in the above formula is: and N ═ 2p +1)/2, where N is a sub-harmonic frequency multiple and p is any integer.
therefore, the main frequencies of the target noise reduction frequencies are denoted as f0,1 and f0,2, and the sub-harmonic frequencies fs1 and fs2 can be denoted as:
f＝[3f,5f,...........,xf]，
f＝[2f,3f,...........,yf]，
Wherein infinity is more than or equal to x and is more than or equal to 2m +1, m1, 2, 3., ∞, wherein infinity is more than or equal to y and is more than or equal to 2, because, the utility model discloses thereby noise interference device 1 can form two dominant frequencies and a plurality of harmonic frequency and can be related to with multifrequency noise, reaches the purpose that the wide band was fallen and is made an uproar.
The range hood exhaust nozzle pipe with the noise interference device 1 is provided with an exhaust nozzle pipe main body 2 and the noise interference device 1 for reducing multi-frequency noise, wherein the noise interference device 1 is assembled on the exhaust nozzle pipe main body 2; the noise interference device 1 is provided with a first opening and a second opening, the first opening and the second opening are respectively communicated with the air duct of the exhaust nozzle pipe main body 2, and the horizontal positions of the first opening and the second opening are different. The utility model discloses noise interference device 1 interferes the area of device 1 through the first trompil of adjustment and second trompil, noise interference device 1's whole length or the shortest distance of first trompil and second trompil reach the making an uproar of falling of specific multifrequency noise. The range hood can keep a good noise reduction effect for a long time, and the noise interference device 1 has the advantages of low cost and high reliability. The noise interference device 1 is to reduce the amplitude of the noise frequency by interfering with the noise transmitted in the air duct through the resonance amplitude and phase of the specific noise frequency, so as to reduce the noise reduction of the specific multi-frequency noise. The material of the noise interference device 1 is corrosion resistant, chemical resistant and not easily damaged.
Example 2.
As shown in fig. 5, the other features of the exhaust nozzle pipe of a range hood with a noise interference device 1 are the same as those of embodiment 1, except that M1 is M2 and M3 is M4. The position where the air duct communicates with the noise interference device is provided with a first through hole 21. The first through hole 21 is provided in plurality. The shape of the first through hole 21 of the present invention is at least one of a circular shape, an oval shape, a triangular shape, a square shape, a rectangular shape, a pentagonal shape, a hexagonal shape, a rhombic shape, or an irregular shape. The shape of the first through hole 21 of the specific embodiment is circular and elliptical. The circular and elliptical first through holes 21 of the present embodiment are relatively easy in process fabrication, and have no interference of edges and corners.
The shape of the first through-hole 21 may be a triangle, a rectangle, a square, a pentagon, a hexagon, a rhombus, or an irregular shape, or may be a combination of the shapes of the plurality of first through-holes 21, and a specific embodiment is determined in actual circumstances.
The noise reduction effect of the noise interference device 1 has a great relationship with the air duct and the pipe diameter of the noise interference device 1. The present invention is preferably M1 ═ M2, M3 ═ M4, M1 ≠ M2, and M3 ≠ M4. This is effective in reducing the broadband noise frequency under the condition that a good noise reduction effect can be achieved even if the resonance phase and amplitude formed in the noise interference device 1 are somewhat deviated in the region below M2 at the same cross-sectional area, i.e., M3 — M4.
When M3> M4, the noise reduction effect of the region below M2 is limited to a specific narrow-band noise, and the noise reduction effect may be somewhat inferior. This is because the phase and amplitude of the acoustic wave at which the noise interference device 1 resonates significantly change the transmission loss of the acoustic wave with a slight deviation. The transmission loss of the noise interference device 1 is a function of Δ L/La at equal cross-sectional areas M3-M4.
example 3.
As shown in fig. 6, other features of a range hood exhaust nozzle pipe with a noise interference device 1 are the same as those of embodiment 1, except that the noise interference device 1 of the present embodiment is provided in plural. The present embodiment is specifically provided with 4 noise interference devices 1.
It should be noted that, the noise interference device 1 of the present invention can be set to 4, and also can be set to any positive integer greater than 1, and the specific number is determined according to the actual situation.
The parameters of the plurality of noise interference devices 1 of the present embodiment may be the same or different from those of embodiment 1. Different noise interference devices 1 with different parameters have different main frequencies f0,1 and f0,2 of different noise interference devices 1, so that noise with wider frequency can be reduced. With the noise interference device 1 having the same parameters, the noise reduction effect at the same frequency can be improved. The plurality of noise interference devices 1 can improve the noise reduction effect.
Example 4.
The utility model provides a take noise to interfere lampblack absorber exhaust nozzle pipe of device 1, as shown in 7 to 10, other characteristics are the same with embodiment 1, the difference lies in, the utility model discloses an exhaust nozzle pipe main part 2 is provided with noise filter equipment 3, and noise filter equipment 3 assembles in the internal surface in wind channel.
The noise filtering means 3 is provided as a panel having a plurality of second through holes 31 for removing multi-frequency noise distributed therein.
the aperture of the second through hole 31 is defined as d, and d is less than or equal to 30 mm. The value of d is plural.
The minimum distance between the edge of the second through hole 31 and the edge of the adjacent second through hole 31 is b, and b is an arbitrary value greater than 0. b has a plurality of values.
In the case where the aperture d is constant, the smaller the value of the minimum distance b between the edge of the second through hole 31 and the edge of the adjacent second through hole 31, the larger the frequency of the target noise to be eliminated. In the case where the minimum distance b between the edge of the second through hole 31 and the edge of the adjacent second through hole 31 is constant, the smaller the value of the aperture d, the smaller the frequency of the target noise to be eliminated.
It should be noted that, when the values of b and d are unique, noise reduction can be performed on specific single-frequency noise. However, when b and d are different values, a specific single-frequency noise or a multi-frequency noise reduction may be formed according to the combination of the two values. The number and size of the values of b and d are determined according to actual conditions.
The utility model discloses an adjust the marginal minimum distance or the noise filter equipment 3 of the marginal and adjacent second through-hole 31 of the aperture of different second through-hole 31 or second through-hole 31 and the distance of exhaust nozzle pipe main part 2 and reach the making an uproar of falling of specific single frequency noise or multifrequency noise.
The utility model discloses a there is the space between the internal surface in noise filter equipment 3 and wind channel, defines the distance in clearance as H1. The exhaust nozzle pipe main body 2 is further provided with a sound absorbing portion 4, and the sound absorbing portion 4 is fixedly fitted in the gap. The thickness of the sound absorbing member 4 is defined as H2, and H2. ltoreq.0.6H 1. The sound absorption part 4 is made of fiber, PP cotton, polyester fiber, carbon fiber or porous foam.
The utility model discloses a fall the device principle of making an uproar: the noise filter device 3 can reduce noise when a noise source propagates to the noise filter device 3 in a limited closed space. The acoustic wave generally travels in the opposite direction upon contact with the noise filter 3, so most of the incident wave and the reflected wave interfere with each other. At the distance department that the distance is about the quarter of noise source wavelength that the characteristic is decided H1, the speed of particle reaches the highest, because of the utility model discloses a noise filter equipment 3 and the distance of the internal face of exhaust nozzle pipe main part 2 just can effectively eliminate the noise of this wavelength in the quarter of noise source wavelength's distance department.
The density and material of the sound absorption part 4 also have an important influence, and sound waves can directly pass through the sound absorption part 4 with the ultralow density without increasing the friction loss of sound energy; at high density, the noise sound waves are reflected directly out and cannot enter the second through hole 31 of the noise filter device 3. Therefore, the sound absorption part 4 of the present invention is preferably made of fiber, PP cotton, polyester fiber, carbon fiber, or porous foam.
The utility model discloses a noise filter 3's resonant frequency's determinant factor: the aperture of the second through hole 31, the minimum distance between the edge of the second through hole 31 and the edge of the adjacent second through hole 31, or the distance between the noise filter device 3 and the exhaust nozzle pipe main body 2, and whether the second through hole 31 is an independent space inside the noise filter device 3, the resonance frequency of the noise filter device 3 can be determined, and the purpose of reducing the specific frequency can be achieved.
In this embodiment, the noise filter 3 and the sound absorbing part 4 are added, so that the energy of the target noise frequency can be filtered or absorbed by the noise filter 3 and the sound absorbing part 4 before entering the noise interference device 1, and the rest noise is eliminated by the noise interference device 1, thereby achieving the maximum noise reduction effect.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. the utility model provides a take noise interference device's lampblack absorber exhaust nozzle pipe which characterized in that: the noise interference device is assembled on the exhaust nozzle pipe body;
The noise interference device is provided with a first opening and a second opening, the first opening and the second opening are respectively communicated with the air duct of the exhaust nozzle pipe main body, and the horizontal positions of the first opening and the second opening are different.
2. a range hood exhaust nozzle pipe with noise interference device according to claim 1, characterized in that: the length of the noise interference device is defined as La, and La is more than 0 and less than or equal to 1000 mm.
3. a range hood exhaust nozzle pipe with noise interference device according to claim 2, characterized in that: the shortest distance between the first opening and the second opening is defined as DeltaL, and La & gt DeltaL & gt 5 mm.
4. A range hood exhaust nozzle pipe with noise interference device according to claim 3, characterized in that: the noise interference device achieves noise reduction of specific multi-frequency noise by adjusting the areas of the first opening and the second opening, the overall length of the noise interference device or the shortest distance between the first opening and the second opening.
5. The range hood exhaust nozzle pipe with noise interference device of claim 4, wherein: defining the first opening as K1, the area of K1 as M1, the second opening as K2, the area of K2 as M2, the area of the air inlet of the air duct as K3, the area of K3 as M3, the area of the air outlet of the air duct as K4, the area of K4 as M4, and M1 ═ M2, M3 ═ M4;
A first through hole is formed in the communication position of the air duct and the noise interference device;
The number of the first through holes is multiple;
The shape of the first through hole is at least one of a circle, an ellipse, a triangle, a square, a rectangle, a pentagon, a hexagon or a rhombus.
6. a hood exhaust nozzle pipe with noise interference device according to claim 4 or 5, characterized in that: the cross section of the noise interference device is in a shape of a circle, an ellipse, a rectangle, a triangle, a diamond or any shape except the above shapes.
7. A hood exhaust nozzle pipe with noise interference device according to any of claims 2 to 5, characterized in that: the noise interference device is provided in plurality.
8. The range hood exhaust nozzle pipe with noise interference device of claim 7, wherein: the main body of the exhaust nozzle pipe is provided with a noise filtering device which is assembled on the inner surface of the air channel;
The noise filtering device is arranged into a panel distributed with a plurality of second through holes for eliminating multi-frequency noise.
9. The range hood exhaust nozzle pipe with noise interference device of claim 8, wherein: the aperture of the second through hole is defined as d, and d is less than or equal to 30 mm;
The minimum distance between the edge of the second through hole and the edge of the adjacent second through hole is b, and b is an arbitrary value larger than 0;
The value of d is multiple;
The value of b is multiple;
The noise filtering device achieves the noise reduction of specific single-frequency noise or multi-frequency noise by adjusting the aperture of different second through holes or the minimum distance between the edge of the second through hole and the edge of the adjacent second through hole or the distance between the noise filtering device and the main body of the exhaust nozzle pipe.
10. A range hood exhaust nozzle pipe with noise interference device according to claim 9, characterized in that: a gap exists between the noise filtering device and the inner surface of the air duct, and the distance of the gap is defined as H1;
The exhaust nozzle pipe main body is also provided with a sound absorption part which is fixedly assembled in the gap;
The thickness of the sound absorption part is defined as H2, and H2 is less than or equal to 0.6H 1;
The sound absorption part is made of PP cotton, polyester fiber, carbon fiber or porous foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821969150.3U CN209744446U (en) | 2018-11-27 | 2018-11-27 | Range hood exhaust nozzle pipe with noise interference device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821969150.3U CN209744446U (en) | 2018-11-27 | 2018-11-27 | Range hood exhaust nozzle pipe with noise interference device |
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| CN209744446U true CN209744446U (en) | 2019-12-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373398A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator exhaust nozzle pipe with noise interference device |
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2018
- 2018-11-27 CN CN201821969150.3U patent/CN209744446U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373398A (en) * | 2018-11-27 | 2019-02-22 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator exhaust nozzle pipe with noise interference device |
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