CN209744442U - Range hood with noise interference device - Google Patents
Range hood with noise interference device Download PDFInfo
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- CN209744442U CN209744442U CN201821969146.7U CN201821969146U CN209744442U CN 209744442 U CN209744442 U CN 209744442U CN 201821969146 U CN201821969146 U CN 201821969146U CN 209744442 U CN209744442 U CN 209744442U
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Abstract
a range hood with a noise interference device is provided with a range hood main body, a volute and an exhaust noise reduction part, wherein the exhaust noise reduction part is assembled on the range hood main body, and the volute is sleeved inside the exhaust noise reduction part; the exhaust noise reduction part is provided with a noise interference device and an exhaust nozzle, wherein the noise interference device is used for reducing multi-frequency noise, the noise interference device is assembled on the exhaust nozzle, and the exhaust nozzle is assembled on the cigarette machine main body. The utility model discloses an adjustment noise interferes the whole length or two open-ended shortest distances that the device's is interfered to two open-ended areas, noise reached 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 main air duct through the resonance amplitude and the phase of the specific noise frequency so as to reduce the amplitude of the noise frequency, thereby achieving the purpose of reducing the noise of the specific multi-frequency noise. 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 lampblack absorber with noise interference 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. The fan noise source of the range hood mainly comes from two parts, one is vortex noise caused by rotating stall of the blades, and the other is noise generated by rotating the blades on the volute tongues. And under the high air volume rotation, the main noise of the fan is the noise generated by the volute tongue.
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 range hood with the noise interference device is provided to solve the defects of the prior art and is necessary.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to avoid prior art's weak point and provide a lampblack absorber with noise interference device. 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 lampblack absorber with noise interference device is provided with cigarette machine main part, spiral case and exhaust noise reduction part, and exhaust noise reduction part assembles in the cigarette machine main part, and the spiral case suit is in the inside of exhaust noise reduction part.
The exhaust noise reduction part is provided with a noise interference device and an exhaust nozzle, wherein the noise interference device is used for reducing multi-frequency noise, the noise interference device is assembled on the exhaust nozzle, and the exhaust nozzle is assembled on the cigarette machine main body.
Preferably, the volute is provided with an air outlet part with a volute tongue and a shell main body, and the shell main body is integrally connected with the air outlet part.
The method comprises the following steps of defining the ground direction as the lower part after the range hood is assembled, defining the vertical height of an exhaust noise reduction part as HT, defining the vertical height from the bottom of an air outlet part to the top of the exhaust noise reduction part as HB, defining the vertical height from the center of a fan impeller assembled in a volute to the top of the exhaust noise reduction part as HC, and defining the HT being more than or equal to HB and less than or equal to HC.
Preferably, the air outlet part is sleeved inside the exhaust noise reduction part.
Preferably, the air outlet part and the shell main body are sleeved inside the exhaust noise reduction part.
Preferably, the exhaust noise reduction part is further provided with sound absorption cotton.
Preferably, the sound-absorbing cotton is fitted under the exhaust nozzle.
Preferably, the air outlet part is sleeved inside the exhaust noise reduction part through sound absorption cotton.
Preferably, the air outlet part and the shell main body are sleeved inside the exhaust noise reduction part through sound absorption cotton.
Preferably, the noise interference device is provided with a first opening, a second opening and a noise interference channel, the noise interference channel is respectively communicated with the air duct of the exhaust nozzle pipe main body through the first opening and the second opening, and the horizontal positions of the first opening and the second opening are different.
Preferably, the length of the noise interference channel is defined as La, and 0 < La.ltoreq.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 is provided with a first opening, a second opening and a noise interference channel, the noise interference channel is communicated with the air duct of the exhaust nozzle pipe main body through the first opening and the second opening respectively, the horizontal positions of the first opening and the second opening are different, the first opening is close to the air inlet of the air duct, and the second opening is close to the air outlet of the air duct.
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, the cross-sectional shape of the noise interference passage is a circle, an ellipse, a rectangle, a triangle, a diamond, or any shape other than the above.
Preferably, the overall shape of the noise interference channel is a C-type overall shape, a W-type overall shape, a V-type overall shape, an M-type overall shape, an N-type overall shape, a wave-type overall shape, a zigzag-type overall shape, or an arbitrary shape other than the above-mentioned shapes.
Preferably, the diameter of the noise interference channel is D, and D is more than 0 and less than or equal to 100 mm.
Preferably, the D has a plurality of values.
Preferably, the noise interference path is provided in a plurality.
Preferably, the noise interference device is an in-cell noise interference device.
The noise interference device is a wall surface of the exhaust nozzle; or
The noise interference device is mounted on a wall surface of the exhaust nozzle.
the utility model discloses a range hood with a noise interference device, which is provided with a range hood main body, a volute and an exhaust noise reduction part, wherein the exhaust noise reduction part is assembled on the range hood main body, and the volute is sleeved inside the exhaust noise reduction part; the exhaust noise reduction part is provided with a noise interference device and an exhaust nozzle, wherein the noise interference device is used for reducing multi-frequency noise, the noise interference device is assembled on the exhaust nozzle, and the exhaust nozzle is assembled on the cigarette machine main body. The utility model discloses an adjustment noise interferes the whole length or two open-ended shortest distances that the device's is interfered to two open-ended areas, noise reached 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 main air duct through the resonance amplitude and the phase of the specific noise frequency so as to reduce the amplitude of the noise frequency, thereby achieving the purpose of reducing the noise of the specific multi-frequency noise. 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 perspective view of a range hood with a noise interference device in embodiment 1.
Fig. 2 is a right side view of fig. 1.
Fig. 3 is a schematic cross-sectional view in the AA direction in fig. 2.
Fig. 4 is a schematic structural view of a volute.
FIG. 5 is a schematic diagram of the relationship of HB, HT and HC of FIG. 4.
FIG. 6 is a schematic cross-sectional view of a noise interference device and a length indicator of a noise interference channel.
FIG. 7 is a schematic cross-sectional view of the noise interference device and the shortest distance Δ L between K1 and K2.
Fig. 8 is a schematic diagram of the shape of the cross section of the noise interference channel, where (1) in fig. 8 is a circle, (2) in fig. 8 is an ellipse, (3) in fig. 8 is a rectangle, (4) in fig. 8 is a triangle, (5) in fig. 8 is a diamond, (6) in fig. 8 is an arbitrary shape, (7) in fig. 8 is an arbitrary shape, and (8) in fig. 8 is an arbitrary shape.
FIG. 9 is a schematic view of the overall shape of the noise interference channel, where (1) in FIG. 9 is a C-type overall shape, (2) in FIG. 9 is a Benzonum-type overall shape, (3) in FIG. 9 is a W-type overall shape, (4) in FIG. 9 is a V-type overall shape, (5) in FIG. 9 is an M-type overall shape, (6) in FIG. 9 is an M-type overall shape, (7) in FIG. 9 is an N-type overall shape, (8) in FIG. 9 is an N-type overall shape, (9) in FIG. 9 is a wave-type overall shape, (10) in FIG. 9 is a wave-type overall shape, (11) in FIG. 9 is a wave-type overall shape, (12) in FIG. 9 is an arbitrary shape, (13) in FIG. 9 is an arbitrary shape, (14) in FIG. 9 is an arbitrary shape, (15) in FIG. 9 is an arbitrary shape, and (16) in FIG. 9 is an arbitrary shape, fig. 9 (17) shows a broken-line type overall shape, and fig. 9 (18) shows a broken-line type overall shape.
FIG. 10 is a schematic representation of the diameter D of the noise interference channel.
Fig. 11 is a schematic sectional view of a range hood having a noise interference device according to embodiment 2.
Fig. 12 is a perspective view of a range hood with a noise interference device according to embodiment 3.
Fig. 13 is a right side view of fig. 12.
Fig. 14 is a schematic cross-sectional view in the AA direction of fig. 12.
fig. 15 is a schematic sectional view of a range hood having a noise interference device according to embodiment 4.
FIG. 16 is a schematic view of a noise interference device according to embodiment 5.
Fig. 17 is a schematic cross-sectional view in the direction of the arrows in fig. 16.
Fig. 18 is a perspective view of an exhaust nozzle of embodiment 6.
in fig. 1 to 18, the following are included:
A noise interference device 1, a noise interference channel 11,
An exhaust noise reduction part 2, an exhaust nozzle 21, a sound absorption cotton 22,
A volute 3, an air outlet part 31, a volute tongue 32, a shell main body 33,
An exhaust duct 4.
Detailed Description
The technical solution of the present invention will be further explained by the following examples.
Example 1.
A range hood with a noise interference device is provided with a range hood main body, a volute 3 and an exhaust noise reduction part 2 as shown in figures 1 to 10, wherein the exhaust noise reduction part 2 is assembled on the range hood main body, and the volute 3 is sleeved inside the exhaust noise reduction part 2.
The exhaust noise reduction part 2 is provided with a noise interference device 1 for reducing multi-frequency noise and an exhaust nozzle 21, the noise interference device 1 is assembled on the exhaust nozzle 21, and the exhaust nozzle 21 is assembled on the cigarette machine body.
The utility model discloses an air outlet and the exhaust pipe 4 of cigarette machine main part of the portion of making an uproar 2 of falling exhaust are connected.
The volute 3 is provided with an air outlet part 31 with a volute tongue 32 and a shell main body 33, and the shell main body 33 is integrally connected with the air outlet part 31.
the direction of the ground after the range hood is assembled is defined as the lower part, the vertical height of the exhaust noise reduction part 2 is defined as HT, the vertical height from the bottom of the air outlet part 31 to the top of the exhaust noise reduction part 2 is defined as HB, the vertical height from the center of a fan impeller (not shown in the drawing) assembled in the volute 3 to the top of the exhaust noise reduction part 2 is defined as HC, and HB is less than or equal to HT and HC is less than or equal to HC.
It should be noted that the connection relationship between the volute tongue 32 and the air outlet 31 and the assembly manner between the fan impeller and the volute 3 are common knowledge, and those skilled in the art should understand that they are not described herein again.
The air outlet part 31 is sleeved inside the exhaust noise reduction part 2.
The noise interference device 1 is provided with a first opening, a second opening and a noise interference channel 11, the noise interference channel 11 is communicated with an air duct of the exhaust nozzle 21 pipe body through the first opening and the second opening respectively, the horizontal positions of the first opening and the second opening are different, the first opening is close to an air inlet of the air duct, and the second opening is close to an air outlet of the air duct. .
The utility model discloses a length definition that passageway 11 is interfered to noise is La, and 0 < La is less than or equal to 1000mm, and the La of this embodiment specifically is 300 mm.
It should be noted that the length of the noise interference channel 11 of the present invention may be 300mm, or may be any length greater than 0 and smaller than 1000mm, and the specific length is determined by the actual situation.
The utility model discloses a delta L is defined to K1 and K2's shortest distance, and La > delta L > 5mm, and the delta L of this embodiment specifically is 100 mm.
It should be noted that the shortest distance between K1 and K2 of the present invention may be 100mm, or may be any distance greater than 5mm and smaller than La, and the specific distance is determined by actual conditions.
The utility model discloses a noise interference device 1 interferes whole length or the shortest distance of first trompil and second trompil of passageway 11 through the area of the first trompil of adjustment and second trompil, noise and reaches the making an uproar of falling of specific multifrequency noise.
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 noise reduction effect of the noise interference device 1 has a great relationship with the diameters of the air duct and the noise interference channel 11. 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.
The utility model discloses a noise interference passageway 11's whole appearance is preferred to be the whole appearance of N type, also can be for the whole appearance of C type, the whole appearance of the enabling small level type, the whole appearance of W type, the whole appearance of V type, the whole appearance of M type, the whole appearance of M type, the whole appearance of N type, the whole appearance of wavy type, the whole appearance of broken line type or the arbitrary shape except above-mentioned shape, specific whole appearance is decided according to actual conditions.
The overall shape of the C-shaped structure of the present invention is shown in (1) of fig. 9.
the overall shape of the utility model is as shown in (2) of fig. 9.
The W-shaped overall shape of the present invention is shown in (3) of fig. 9.
The overall shape of the V-shape of the present invention is shown in (4) of fig. 9.
The overall shape of the M-shaped structure of the present invention is shown as (5) in fig. 9.
The m-shaped overall shape of the utility model is shown as (6) in fig. 9.
The overall shape of the N-shaped structure of the present invention is shown as (7) in fig. 9.
The n-type overall shape of the present invention is shown as (8) in fig. 9.
The utility model discloses a whole appearance of wave type, as shown in (9) in fig. 9, (10) in fig. 9 and (11) in fig. 9, it is to be explained, the whole appearance of wave type in the utility model is not restricted to (9) in fig. 9, (10) as in fig. 9 and the whole appearance of these three kinds of wave types of (11) in fig. 9, and the whole appearance of other arbitrary wave types also accords with the requirement of the whole appearance of wave type, also is in the protection scope of the utility model.
The arbitrary shape of the present invention, as shown in fig. 9 (12), (13), (14), (15) and (16) in fig. 9, (13), (14), (15) and 9) of fig. 9, it should be noted that the arbitrary shape of the present invention is not limited to these 5 arbitrary shapes of fig. 9 (12), (13), (14), (15) and (16) of fig. 9, (13), (15) and 9, and other arbitrary shapes also meet the requirements of the arbitrary shape of the present invention, and are within the protection scope of the present invention.
The utility model discloses a whole appearance of broken line type, as shown in (17) in fig. 9 and (18) in fig. 9, it is to be explained, the whole appearance of broken line type in the utility model is not restricted to the whole appearance of these 2 kinds of broken line types of (17) in fig. 9 and (18) in fig. 9, and the whole appearance of other broken line types also accords with the utility model discloses the whole requirement of appearance of broken line type is also in the protection scope of the utility model.
The shapes of the C-type overall shape, the n-type overall shape, the m-type overall shape or the wave-type overall shape and the like do not have the corner shapes, so that the energy loss of sound waves in the noise interference channel 11 can be reduced, the effect of sound wave interference with a noise source is improved, and the noise reduction effect is further improved.
The cross section of the noise interference channel 11 of the present invention is preferably circular, and may be oval, rectangular, triangular, rhombic, or any shape other than the above shapes, and the shape of the specific cross section is determined according to the actual situation.
The cross section of the noise interference channel 11 of the present invention is circular, as shown in (1) in fig. 8.
The cross section of the noise interference channel 11 of the present invention is elliptical, as shown in (2) in fig. 8.
The cross section of the noise interference channel 11 of the present invention is rectangular, as shown in (3) in fig. 8. It should be noted that the rectangle in the present invention is not limited to the rectangle shown in (3) in fig. 8, 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 channel 11 of the present invention is triangular, as shown in (4) in fig. 8.
The cross section of the noise interference channel 11 of the present invention is a diamond shape, as shown in (5) in fig. 8.
The cross section of the noise interference passage 11 of the present invention is an arbitrary shape, as shown in (6) in fig. 8, (7) in fig. 8, and (8) in fig. 8. It should be noted that the arbitrary shape in the present invention is not limited to the 3 rectangles of fig. 8 (6), fig. 8 (7) and fig. 8 (8), and other arbitrary shapes also meet the requirements of the arbitrary shape in the present invention, and are also within the scope of the present invention.
The cross section of the noise interference channel 11 is in a shape without an edge angle, such as a circle or an ellipse, which can reduce the energy loss of the sound wave in the noise interference device 1, thereby improving the effect of sound wave interference with a noise source and further improving the noise reduction effect.
The utility model discloses a diameter that passageway 11 was interfered to noise is D, and 0 < D is less than or equal to 100mm, and wherein D's value is a plurality of. Taking this embodiment as an example, the overall shape of the noise interference channel 11 is an n-type overall shape, the cross section is circular, and the value of D is plural, that is, the noise interference device 1 of this embodiment is a C-type overall shape in which the cross section of the noise interference channel 11 is circular with plural different inner diameters.
The noise interference channel 11 of the present embodiment is provided in plural, specifically, 6. It should be noted that the number of the noise interference channels 11 of the present invention may be 6, or may be any number greater than 2, and the specific implementation is determined according to the actual situation.
The parameters of the plurality of noise interference channels 11 of the present embodiment may be the same or different. Different from the parametric noise interference channel 11, the main frequencies of different noise interference channels 11 are different from f0,1 and f0,2, so that the noise of wider frequency can be reduced. For the noise interference channels 11 having the same parameters, the noise reduction effect of the same frequency can be 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 bright 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 fallen noise.
This lampblack absorber with noise interference device is provided with cigarette machine main part, spiral case 3 and exhaust noise reduction part 2, and exhaust noise reduction part 2 assembles in the cigarette machine main part, and spiral case 3 suit is in the inside of exhaust noise reduction part 2. The exhaust noise reduction part 2 is provided with a noise interference device 1 for reducing multi-frequency noise and an exhaust nozzle 21, the noise interference device 1 is assembled on the exhaust nozzle 21, and the exhaust nozzle 21 is assembled on the cigarette machine body. The utility model discloses an adjustment noise interferes device 1's two open-ended areas, noise interference passageway 11's whole length or two open-ended shortest distances reach the making an uproar of falling of specific multifrequency noise. The volute 3 of 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 main 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.
The utility model provides a lampblack absorber with noise interference device, as shown in FIG. 11, other characteristics are the same with embodiment 1, the difference lies in, the utility model discloses an air-out portion 31 and shell main part 33 all suit in the inside of the portion of making an uproar 2 falls in the exhaust.
compared with embodiment 1, the present embodiment has the scroll casing 3 in which more part is fitted into the exhaust noise reduction part 2, so that more noise generated in the scroll tongue 32 enters the exhaust noise reduction part 2 and is reduced inside the exhaust noise reduction part 2, thereby improving noise reduction effect.
Example 3.
A lampblack absorber with noise interference device, as shown in fig. 12 to 14, other characteristics are the same as embodiment 1, except that the exhaust noise reduction part 2 is also provided with sound absorption cotton 22; the sound absorbing cotton 22 is sleeved on the lower part of the exhaust nozzle 21. The air outlet part 31 is sleeved inside the exhaust noise reduction part 2 through the sound absorption cotton 22.
The utility model discloses inhale cotton 22's of sound density and material and have important influence, the sound wave can directly pass the cotton 22 of inhaling of ultra-low density of sound, and the friction consume that has no way to increase the acoustic energy. Therefore, the sound-absorbing cotton 22 of the present invention is preferably made of fiber, PP cotton, polyester fiber, carbon fiber or porous foam.
Compared with the embodiment 1, the sound absorption cotton 22 is added in the embodiment to firstly absorb the noise generated by the volute tongue 32, and then the absorbed noise interferes, so that the high noise reduction effect is improved.
Example 4.
A range hood with a noise interference device, as shown in figure 15, has the same other characteristics as embodiment 3, except that an air outlet part 31 and a shell main body 33 are sleeved inside an exhaust noise reduction part 2 through sound absorption cotton 22.
Compared with embodiment 3, the present embodiment has the scroll casing 3 in which more part is fitted into the exhaust noise reduction part 2, so that more noise generated in the scroll tongue 32 enters the exhaust noise reduction part 2 and is reduced inside the exhaust noise reduction part 2, thereby improving the noise reduction effect.
Example 5.
As shown in fig. 16 and 17, a range hood having a noise interference device has the same other features as those of embodiment 1 except that the noise interference device 1 of the present embodiment is an inline noise interference device 1, and the noise interference device 1 is mounted on a wall surface of an exhaust nozzle 21.
The non-naked appearance of the noise interference device 1 is more concise than that of example 1. The in-line noise interference device 1 is simpler and more time-saving in process assembly, production assembly, and at the same time, reliability is improved, and leakage prevention is easier to achieve because of the reduction of connecting parts.
Example 6.
As shown in fig. 18, the other features of the range hood having the noise interference device are the same as those of embodiment 1, except that the noise interference device 1 of the present embodiment is an inline noise interference device 1, and the noise interference device 1 is a wall surface of an exhaust nozzle 21. The noise interference channels 11 of the present embodiment are provided in 2 pieces.
Compared with the embodiment 5, the noise interference device 1 is directly processed into the exhaust nozzle 21 pipe, the exhaust nozzle 21 pipe and the noise interference device 1 can be combined into a whole, the exposed volume is reduced, the appearance of the whole product is simpler, and the noise interference device with an integrated structure is simpler in process assembly and production assembly and saves more time.
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 (16)
1. A lampblack absorber with noise interference device which characterized in that: the smoke exhaust ventilator is provided with a smoke exhaust ventilator main body, a volute and an exhaust noise reduction part, wherein the exhaust noise reduction part is assembled on the smoke exhaust ventilator main body, and the volute is sleeved inside the exhaust noise reduction part;
The exhaust noise reduction part is provided with a noise interference device and an exhaust nozzle, wherein the noise interference device is used for reducing multi-frequency noise, the noise interference device is assembled on the exhaust nozzle, and the exhaust nozzle is assembled on the cigarette machine main body.
2. The range hood having a noise interference device according to claim 1, wherein: the volute is provided with an air outlet part with a volute tongue and a shell main body, and the shell main body is integrally connected with the air outlet part;
The method comprises the following steps of defining the ground direction as the lower part after the range hood is assembled, defining the vertical height of an exhaust noise reduction part as HT, defining the vertical height from the bottom of an air outlet part to the top of the exhaust noise reduction part as HB, defining the vertical height from the center of a fan impeller assembled in a volute to the top of the exhaust noise reduction part as HC, and defining the HT being more than or equal to HB and less than or equal to HC.
3. The range hood having a noise interference device according to claim 2, wherein: the air outlet part is sleeved inside the exhaust noise reduction part.
4. A range hood having a noise interference device according to claim 3, characterized in that: the air outlet part and the shell main body are sleeved inside the exhaust noise reduction part.
5. The range hood having a noise interference device according to claim 2, wherein: the exhaust noise reduction part is also provided with sound absorption cotton;
The sound-absorbing cotton is sleeved below the exhaust nozzle.
6. The range hood having a noise interference device according to claim 5, wherein: the air outlet part penetrates through the sound-absorbing cotton and is sleeved inside the exhaust noise reduction part.
7. The range hood having a noise interference device according to claim 5, wherein: the air outlet part and the shell main body penetrate through the sound-absorbing cotton and are sleeved inside the exhaust noise reduction part.
8. The range hood having a noise interference device according to any one of claims 4 to 7, wherein: the noise interference device is provided with a first opening, a second opening and a noise interference channel, the noise interference channel is communicated with the air channel of the exhaust nozzle pipe main body through the first opening and the second opening respectively, the horizontal positions of the first opening and the second opening are different, the first opening is close to the air inlet of the air channel, and the second opening is close to the air outlet of the air channel.
9. The range hood having a noise interference device according to claim 8, wherein: the length of the noise interference channel is defined as La, and La is more than 0 and less than or equal to 1000 mm;
The shortest distance between the first opening and the second opening is defined as DeltaL, and La & gt DeltaL & gt 5 mm.
10. The range hood having a noise interference device according to claim 9, wherein: the noise interference device achieves the noise reduction of specific multi-frequency noise by adjusting the areas of the first opening and the second opening, the whole length of the noise interference channel or the 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.
11. The range hood having a noise interference device according to claim 10, wherein: the cross section of the noise interference channel is in a shape of a circle, an ellipse, a rectangle, a triangle or a rhombus.
12. The range hood having a noise interference device according to claim 11, wherein: the overall appearance of the noise interference channel is C-shaped overall appearance, Benzonum-shaped overall appearance, W-shaped overall appearance, V-shaped overall appearance, M-shaped overall appearance, M-shaped overall appearance, N-shaped overall appearance, N-shaped overall appearance, wave-shaped overall appearance or broken line-type overall appearance.
13. The range hood having a noise interference device according to claim 12, wherein: the diameter of the noise interference channel is D, and D is more than 0 and less than or equal to 100 mm;
the value of D is multiple.
14. The range hood having a noise interference device according to claim 13, wherein: the noise interference channel is provided with a plurality of channels.
15. The range hood having a noise interference device according to claim 14, wherein: the noise interference device is an embedded noise interference device.
16. The range hood having a noise interference device according to claim 15, wherein: the noise interference device is a wall surface of the exhaust nozzle; or
The noise interference device is mounted on a wall surface of the exhaust nozzle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821969146.7U CN209744442U (en) | 2018-11-27 | 2018-11-27 | Range hood with noise interference device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821969146.7U CN209744442U (en) | 2018-11-27 | 2018-11-27 | Range hood with noise interference device |
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| CN209744442U true CN209744442U (en) | 2019-12-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373396A (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 with noise interference device |
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2018
- 2018-11-27 CN CN201821969146.7U patent/CN209744442U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373396A (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 with noise interference device |
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