CN213395380U - Impedance combined type amortization inserted sheet and applied silencer of this amortization inserted sheet - Google Patents

Abstract

The utility model belongs to the technical field of industrial noise pollution administers, especially, silencer of impedance combined type amortization inserted sheet and applied this amortization inserted sheet. The utility model comprises an impedance composite silencing insertion piece, which consists of a hollow shell, a first partition plate arranged in the shell and a second partition plate arranged in the first partition plate; the sound absorption material is filled between the shell and the first partition plate, a first resonant cavity is formed by a gap between the first partition plate and the first partition plate, and a second resonant cavity is arranged between the second partition plate. The utility model discloses set up resistance noise elimination unit in hindering nature noise elimination unit, not only can be used for the noise treatment of the equal outstanding wide band gas vent of low frequency, medium-high frequency noise simultaneously, and the resonant cavity unit hides in hindering nature noise elimination unit, has reduced the volume of amortization inserted sheet and silencer, has reduced the air resistance.

Description

Impedance combined type amortization inserted sheet and applied silencer of this amortization inserted sheet

Technical Field

The utility model belongs to industrial noise pollution administers the field, especially relates to a silencer of impedance combined type amortization inserted sheet and applied this amortization inserted sheet.

Background

In each industrial production field, a large amount of tail gas is discharged through a chimney, the exhaust outlet of the chimney is subjected to aerodynamic noise generated by high-flow-rate airflow and medium-low frequency mechanical noise radiated by mechanisms such as various fan impellers (common centrifugal fans) and the like, the generated high noise brings adverse effects on the surrounding environment, and the exhaust outlet is generally higher in position, so that the noise pollution is further influenced, and the existing solution is generally to additionally install a silencer.

The common design of the smoke exhaust silencer generally adopts a structure that a shell is added with a silencing insertion sheet (composed of a perforated plate, waterproof cloth, sound absorption cotton and the like), the structure is mostly based on a resistive silencing principle, is influenced by the characteristics of the aperture of the perforated plate, the sound absorption coefficient of a sound absorption material and the like, and has better silencing effect on medium-frequency and high-frequency noises, but has poorer silencing effect on low-frequency noises (longer wavelength); through noise source spectrum analysis, aiming at the occasions with prominent low-frequency noise, the existing impedance compound type noise elimination can be designed according to impedance compound type (resistive noise elimination mainly aims at medium-high frequency noise and resistive noise elimination mainly aims at low-frequency noise), the existing impedance compound type noise elimination mostly adopts a design of separating a resistive noise elimination unit and a resistive noise elimination unit (for example, smoke firstly passes through the resistive noise elimination unit and then passes through the resistive noise elimination unit), the resistive unit generally adopts a ultramicropore plate or a resonant cavity structure form, the above form often brings adverse effects on two aspects, on one hand, the height of the whole noise eliminator or the length of the noise elimination unit is overlarge, and in addition, if the resonant cavity unit structure is directly exposed in air flow, the resistance influence is larger, the fan is; on the other hand, fine dust in the flue gas can be accumulated in resistant units such as the ultramicropore plate and the resonant cavity, and the blockage is caused by long-time operation, so that the noise elimination and reduction effects are gradually reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect among the above-mentioned prior art, for this reason, the utility model provides an impedance combined type amortization inserted sheet and applied this amortization inserted sheet's silencer. The utility model discloses can handle to low frequency, well high frequency noise simultaneously.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an impedance composite type silencing insertion piece comprises an impedance composite type silencing insertion piece, wherein the impedance composite type silencing insertion piece consists of a hollow shell, a first partition plate arranged in the shell and a second partition plate arranged in the first partition plate; the sound absorption material is filled between the shell and the first partition plate, a first resonant cavity is formed by a gap between the first partition plate and the first partition plate, and a second resonant cavity is arranged between the second partition plate.

Preferably, the housing is made of a resistive porous plate.

Preferably, the first partition board and the second partition board are both made of ultra-microporous sound-absorbing boards.

Preferably, the sound absorbing material is glass wool.

Preferably, the middle section of the shell and the silencer shell are both hollow cuboid structures.

Preferably, both ends of the housing are formed in a dome shape protruding outward.

In order to achieve the above object, the utility model also provides a silencer, including setting up in the silencer casing of chimney air exhaust department, still include impedance combined type amortization inserted sheet, the equal vertical array distribution of a plurality of impedance combined type amortization inserted sheets is in the silencer casing.

Preferably, both ends of the plurality of impedance combined type silencing insertion pieces are fixedly connected with the silencer shell through reinforcing steel bars.

Preferably, the air inlet of the silencer shell is connected with the air outlet of the chimney through the reducing air pipe, and the caliber of the air inlet of the reducing air pipe is smaller than that of the air outlet.

Preferably, the air outlet of the silencer shell is provided with a rain-proof cap.

The utility model has the advantages that:

(1) the utility model discloses a amortization inserted sheet sets up resistance noise elimination unit in hindering nature noise elimination unit, not only can be used for the low frequency simultaneously, the noise treatment of the equal outstanding wide band gas vent of medium-high frequency noise, and the resonant cavity unit hides in hindering nature noise elimination unit, the volume of amortization inserted sheet has been reduced, the air current resistance has been reduced, fine dust in the flue gas also can not pile up in resistance noise elimination units such as ultramicropore board and resonant cavity, can effectively avoid the dust to block up the condition of resistance noise elimination unit, be favorable to the widelys popularization in industrial noise pollution control field.

(2) The utility model discloses a both ends of amortization inserted sheet are outside bellied dome form, but the resistance of greatly reduced air current, and the middle section of amortization inserted sheet is cuboid structure and the corresponding setting of silencer casing, and the amortization inserted sheet evenly distributed of being convenient for in the silencer casing, and be convenient for make the interval between the adjacent amortization inserted sheet the same, and then the air current of being convenient for evenly passes through the amortization inserted sheet, and whole processing preparation is convenient, the processing cost is low, the assembly line processing of being convenient for.

(3) The silencer of the utility model is provided with a plurality of impedance composite silencing insertion pieces, which not only reduces the volume of the silencer, but also improves the noise reduction effect of the silencer; and all parts in the silencer are connected by flanges or bolts, so that the silencer is convenient to mount, dismount and replace parts such as silencing insertion pieces and the like, and has long service life.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the structure of the utility model A-A.

Fig. 3 is a schematic view of a partial sectional structure of the impedance combined type silencing insert of the present invention.

Fig. 4 is a schematic structural view of the present invention B-B.

The notations in the figures have the following meanings:

1-silencer shell, 2-impedance composite silencing insertion sheet, 21-shell, 22-first partition board, 23-second partition board, 24-sound-absorbing material, 25-first resonant cavity, 26-second resonant cavity, 3-chimney exhaust outlet, 4-variable diameter air pipe, 5-rain-proof cap and 6-reinforcing steel bar.

Detailed Description

As shown in fig. 1 to 4, an impedance composite noise elimination insert 2 includes a resistive noise elimination unit and a resistive noise elimination unit, the resistive noise elimination unit is disposed inside the resistive noise elimination unit, the resistive noise elimination unit includes a housing 21, a sound absorption material 24 and a first partition board 22, the sound absorption material 24 is filled in a gap between the housing 21 and the first partition board 22, and specifically, the sound absorption material 24 is glass wool; the reactive noise elimination unit comprises a first partition board space 22 and a second partition board space 23, the second partition board space 23 is covered in the first partition board space 22, a gap between the first partition board space 22 and the second partition board space 23 forms a first resonant cavity 25, a cavity in the second partition board space 23 is a second resonant cavity 26, and the first resonant cavity 25 and the second resonant cavity 26 can absorb wavelengths in low-frequency noise, so that the noise elimination and reduction effects are achieved. The volumes of the first resonant cavity 25 and the second resonant cavity 26 can be designed according to the requirements of the specific implementation.

Specifically, the housing 21 is made of a resistive porous plate, and the aperture of the resistive porous plate is 3-5mm, and the optimal value is 3 mm; the first partition plate room 22 and the second partition plate room 23 are both made of ultra-microporous sound-absorbing plates, and the pore diameter of the ultra-microporous sound-absorbing plate is 1-1.5mm, and the optimal value is 1 mm. The thickness of the resistive porous plate and the thickness of the ultramicropore noise reduction plate can also be designed according to the requirements in the concrete implementation

Furthermore, the middle section of the outer shell 21 and the muffler shell 1 are both hollow cuboid structures, and two ends of the outer shell 21 are in a dome shape protruding outwards, so that airflow discharged from the chimney uniformly passes through the interior of the muffler shell 1, and the purpose of uniform noise elimination can be achieved.

As shown in fig. 1, a muffler comprises a muffler shell 1 arranged at an air outlet 3 of a chimney and further comprises impedance composite muffling insertion pieces 2, wherein the impedance composite muffling insertion pieces 2 are distributed in the muffler shell 1 in a vertical array manner; the air inlet of the silencer shell 1 is connected with the chimney air outlet 3 through the reducing air pipe 4, the caliber of the air inlet of the reducing air pipe 4 is smaller than that of the air outlet, and a large amount of chimney gas can enter the silencer shell 1 through the reducing air pipe 4, so that the silencing area is increased.

As shown in fig. 1, the top of the air outlet of the silencer shell 1 is provided with a flange, connecting rods are vertically arranged at the top of the flange at intervals, and rain-proof caps 5 are fixedly connected to the tops of the connecting rods and can shield rain for the silencer shell 1 and a chimney.

During the actual engineering design, firstly, according to the parameters of the source intensity of the noise source at the exhaust outlet of the chimney, the frequency spectrum characteristics (each octave or 1/3 frequency range and the like), the flow rate and the flow velocity of smoke, the diameter of the original exhaust outlet, the target noise elimination amount and the like, the number, the length and the interval arrangement of the noise elimination inserting pieces are determined by calculation according to various theoretical and empirical formulas such as the Sabin formula, the Perofoff formula and the like, the opening ratio and the pore size of the resistive porous plate, the material volume weight and the sound absorption coefficient of the sound absorption material 24, the opening ratio and the pore size of the inner layer and the outer layer of the super-microporous plate and the thicknesses of the first resonant cavity 25. According to the calculation result of the internal impedance combined type noise elimination unit, the overall impedance combined type noise elimination insert and the overall dimension (including the cross section dimension, the length or height of the noise eliminator, the design of reducing diameter and the like) of the noise eliminator using the noise elimination insert are determined, and when the total height of the noise eliminator is too long, the noise eliminator can be designed and manufactured in a sectional mode, and flanges and bolts are adopted for connection, so that the noise eliminator is convenient to install and disassemble. In practical engineering application, can be according to on-spot installation environment or requirement, the silencer that discharges fume can erect the dress, also can transversely place.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides an impedance combined type amortization inserted sheet which characterized in that: the noise-reducing insert comprises an impedance composite noise-reducing insert (2), wherein the impedance composite noise-reducing insert (2) consists of a hollow shell (21), a first partition plate (22) arranged in the shell (21) and a second partition plate (23) arranged in the first partition plate (22); a sound absorbing material (24) is filled between the outer shell (21) and the first partition plate (22), a first resonant cavity (25) is formed by a gap between the first partition plate (22) and the first partition plate (22), and a second resonant cavity (26) is arranged in the second partition plate (23).

2. The impedance composite muffling insert of claim 1, wherein: the housing (21) is made of a resistive porous plate.

3. The impedance composite muffling insert of claim 1, wherein: the first partition plate (22) and the second partition plate (23) are both made of ultra-microporous sound-absorbing plates.

4. The impedance composite muffling insert of claim 1, wherein: the sound absorbing material (24) is glass wool.

5. The impedance composite muffling insert of claim 1, wherein: the middle section of the shell (21) and the silencer shell (1) are both of hollow cuboid structures.

6. The impedance composite muffling insert of claim 1, wherein: the two ends of the shell (21) are in a dome shape protruding outwards.

7. The utility model provides a silencer, is including setting up silencer casing (1) in chimney air exit (3) department, its characterized in that: the silencer shell also comprises the impedance composite silencing insertion sheet as claimed in any one of claims 1 to 6, wherein a plurality of the impedance composite silencing insertion sheets (2) are distributed in the silencer shell (1) in a vertical array mode.

8. The muffler of claim 7, wherein: and a plurality of two ends of the impedance composite type silencing insertion piece (2) are fixedly connected with the silencer shell (1) through reinforcing steel bars (6).

9. The muffler of claim 7, wherein: the air inlet of the silencer shell (1) is connected with the chimney air outlet (3) through the reducing air pipe (4), and the caliber of the air inlet of the reducing air pipe (4) is smaller than that of the air outlet.

10. The muffler of claim 7, wherein: an air outlet of the silencer shell (1) is provided with a rain-proof cap (5).

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