CN215495992U - Environment-friendly double-layer micro-perforated pipe sound absorption device - Google Patents
Environment-friendly double-layer micro-perforated pipe sound absorption device Download PDFInfo
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- CN215495992U CN215495992U CN202120044377.2U CN202120044377U CN215495992U CN 215495992 U CN215495992 U CN 215495992U CN 202120044377 U CN202120044377 U CN 202120044377U CN 215495992 U CN215495992 U CN 215495992U
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Abstract
The utility model discloses an environment-friendly double-layer micro-perforated pipe sound absorption device. The double-layer micro-perforated pipe noise elimination device comprises a noise elimination pipeline and a plurality of double-layer micro-perforated pipes fixedly installed in the noise elimination pipeline, wherein one open end of the noise elimination pipeline is used as an air inlet, the other open end of the noise elimination pipeline is used as an air outlet, noise elimination holes are distributed in two layers of pipe bodies of the double-layer micro-perforated pipes, and air flow entering the noise elimination pipeline from the air inlet can be exhausted from an air outlet through the sound absorption of the double-layer micro-perforated pipes. The advantages are that: simple structure, the size is unified, its microporous structure quality is light, can easily install the change in the noise elimination pipeline, it is convenient to maintain, the double-deck micro-perforated pipe of whole metal construction has been used, pollution source-free environmental protection safety more, long service life, the price is more economical than stainless steel wool simultaneously, the problem that traditional sound absorbing device pollutes and resistive section quality is too big has been solved, more importantly still does benefit to the noise elimination performance of guaranteeing resistive section for a long time, replace resistive sound absorption section with it, make its sound absorption performance good.
Description
Technical Field
The utility model relates to a sound absorption device for a ventilation system of a nuclear power air-conditioning plant, a ventilation and discharge system of a diesel plant, a fan ventilation system and a steam supply and steam driven pump steam discharge system, in particular to an environment-friendly double-layer micro perforated pipe sound absorption device.
Background
With the improvement of the localization and environmental awareness of nuclear power system equipment in recent years, a great number of resistive sound absorption sections containing glass silk floss are used in a ventilation system of a plurality of air-conditioning plants of a nuclear power plant, a ventilation and discharge system of a diesel plant, a fan ventilation system and a steam supply and steam pump steam discharge system, although the sound absorption sections in the form are good in sound absorption performance, glass fibers in the glass silk floss have huge potential safety hazards, specifically, the glass fibers contain a great amount of alkaline ions, condensate water in the steam discharge system can be polluted, and cooling condensate water of the water supply system cannot be recycled, so that the safety of the system is influenced; the glass fiber is easy to leak from the wrapped glass cloth and scatters in the air conditioning system, thus threatening the safety of office staff; the service life of the glass floss silk is short, the glass floss silk can age in several years and needs to be continuously replaced.
In order to solve the pollution problem in two years, the resistive sound absorption section tries to replace glass wool with stainless steel wool, but the mass density of the stainless steel wool is high, the sound absorption performance is poor, and the resistive sound absorption section is overlarge in mass and overlarge in price.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an environment-friendly double-layer micro perforated pipe sound absorption device which is light in structural weight, good in sound absorption performance, beneficial to installation and maintenance of a resistive section and environment-friendly.
In order to solve the technical problem, the environment-friendly double-layer micro-perforated pipe sound absorption device comprises a noise elimination pipeline and a plurality of double-layer micro-perforated pipes fixedly arranged in the noise elimination pipeline, wherein one open end of the noise elimination pipeline is used as an air inlet, the other open end of the noise elimination pipeline is used as an air outlet, noise elimination holes are distributed in two layers of pipe bodies of each double-layer micro-perforated pipe, and air flow entering the noise elimination pipeline from the air inlet can be exhausted from an air outlet through the sound absorption of each double-layer micro-perforated pipe.
The air inlet and the air outlet both ends of noise elimination pipeline all are provided with the support frame, each the double-deck microperforated pipe all passes through support frame fixed mounting in noise elimination pipeline.
The diameter and the distribution density of the silencing holes on the inner layer of the pipe body are larger than those on the outer layer of the pipe body
The double-layer micro-perforated pipe is made of stainless steel materials.
The diameter of inlayer the body is 40 ~ 100mm, and is outer the diameter of body is 100 ~ 200 mm.
The thickness of the two layers of pipe bodies of the double-layer micro-perforated pipe is 0.4-1.0 mm, and the aperture of the two layers of pipe bodies is 0.6-1.0 mm.
The perforation rate of the silencing holes of the two layers of pipe bodies is between 1 and 5 percent.
The utility model has the advantages that:
the double-layer micro perforated pipe is adopted as a main sound absorption unit, so that the structure is simple, the size is uniform, the micropore structure is light in weight, the double-layer micro perforated pipe with an integral metal structure can be easily installed and replaced in a noise elimination pipeline, the maintenance is convenient, the double-layer micro perforated pipe with the integral metal structure is used, not only is the double-layer micro perforated pipe free of pollution sources and more environment-friendly and safe, but also the service life is long, the price is more economical than that of stainless steel wool, the problems of pollution and overlarge quality of a resistance section of a traditional sound absorption device are solved, more importantly, the noise elimination performance of the resistance section is guaranteed for a long time, particularly, the sound absorption device forms a required resonant cavity by utilizing the double-layer micro perforated pipe and controlling the diameter difference of the double-layer micro perforated pipe, then controls the sound absorption frequency band of the sound absorption device by controlling the aperture and the wall thickness of the micro perforated pipe, and replaces the resistance sound absorption section, and the sound absorption performance is good.
Drawings
FIG. 1 is a front view of an environment-friendly type double-layered micro perforated pipe sound absorption device according to the present invention
FIG. 2 is a top view of the environmentally friendly double-layered micro-perforated pipe sound absorption apparatus according to the present invention;
FIG. 3 is a perspective view of a double-layered microperforated tube of the present invention.
Detailed Description
The environment-friendly double-layer micro-perforated pipe sound absorption device according to the present invention will be described in detail with reference to the accompanying drawings and embodiments.
As shown in the figure, the environment-friendly double-layer micro-perforated pipe sound absorption device comprises a sound absorption pipeline 1 and a plurality of double-layer micro-perforated pipes 2 fixedly arranged in the sound absorption pipeline, wherein one open end of the sound absorption pipeline 1 is used as a gas inlet, the other open end of the sound absorption pipeline is used as a gas outlet, as can be seen from the figure, two ends of the gas inlet and the gas outlet of the sound absorption pipeline 1 are respectively provided with a support frame 3, each double-layer micro-perforated pipe 2 is fixedly arranged in the sound absorption pipeline 1 through the support frames, the double-layer micro-perforated pipes 2 are integrally arranged in the sound absorption pipeline according to the mode shown in the figure 1, the sectional area S and the channel perimeter P of a whole resistance section sound absorption channel are determined through the arrangement mode, the structure of the double-layer micro-perforated pipes 2 is shown in the figure 2, each double-layer micro-perforated pipe 2 is of a double-layer sound absorption structure formed by an outer pipe body and an inner pipe body, and the sound absorption holes are respectively arranged on the two layer pipe bodies of each double-layer micro-perforated pipe 2, the length of each double-layer micro perforated pipe 2 determines the length L of the silencing channel of the resistive section, and airflow entering the silencing pipeline from the air inlet can absorb sound through each double-layer micro perforated pipe and then is discharged from the air outlet.
And calculating the noise elimination quantity of the resistive section according to a Belov formula:
under the condition that the overall structure of the environment-friendly double-layer micro-perforated pipe sound absorption device is determined, the sectional area S of a resistive section noise elimination channel, the channel perimeter P and the channel length L are determined, and at the moment, the sound absorption coefficient alpha of the double-layer micro-perforated pipe under each frequency spectrum needs to be controlled by controlling the detailed structure of the double-layer micro-perforated pipe so as to work out
The relative acoustic impedance ratio z of the two-layer sound absorbing structure can be expressed by the following equation:
in the formula r1The relative sound resistance of the 1 st layer of micro-perforated plate (the pipe body with the muffling holes arranged); omega is angular frequency; m is1Relative acoustic mass for the layer 1 microperforated panel; c is the speed of sound; r is2The relative acoustic resistance of the 2 nd layer of microperforated panel; m is2Relative acoustic mass for the layer 2 microperforated panel; d1Is the anterior chamber depth; d2Is the posterior chamber depth.
The relative acoustic resistance r and the relative acoustic resistance x of the double-layer sound absorption structure are respectively as follows:
when the light is in normal incidence, the sound absorption coefficient alpha of the sound absorption structure of the double-layer micro-perforated plate is
The structure of the double-layer micro-perforated pipe is shown in figure 3, and the radius difference of the two layers of micro-perforated pipes forms the depth D of the front cavity1The diameter of the inner microperforated tube defines the depth D of the posterior chamber2When the structure of the double-layer micro-perforated pipe is designed, the depth of the front cavity and the rear cavity can be controlled by changing the diameter of the two layers of micro-perforated pipes, so that the sound absorption coefficient of the double-layer micro-perforated pipe meets the requirement; according to the restriction that practical application demand and noise-eliminating structure are unknown, the diameter of inlayer body is 40 ~ 100mm in the double-deck micro perforation tubular structure, and the diameter of outer body is 100 ~ 200 mm.
The aperture and the distribution density of the muffling holes on the inner layer pipe body are larger than those on the outer layer pipe body, specifically as shown in FIG. 3, the perforation rate p of the perforated plate (the pipe body in which the muffling holes are distributed), the plate thickness t and the perforation aperture d of the perforated plate affect the relative sound quality m of the micro-perforated plate,
constant of perforated plate
Where t is the sheet thickness, d is the perforation diameter in mm, p is the perforation percentage, and f is the sound frequency.
When the double-layer micro-perforated pipe structure is designed, the perforation rates of the two layers of perforated pipes are different, so that the sound absorption frequency band is widened, meanwhile, the ratio of the perforation rates is controlled, the interference region of the sound absorption frequency band is removed, the sound absorption coefficient in the frequency band with the specific width can meet the requirement, and the perforation rate of the perforations of the double-layer micro-perforated pipe is between 1% and 5%.
The thickness of the two layers of pipe bodies of the double-layer micro-perforated pipe is 0.4-1.0 mm, the aperture of the two layers of pipe bodies is 0.6-1.0 mm, the sound absorption frequency bandwidth and the sound absorption coefficient of the double-layer micro-perforated pipe can be effectively improved, the absorption of the noise along the layer can be realized through the sound absorption performance of the self double-layer micro-perforated sound absorption structure, the material of the double-layer micro-perforated pipe 2 is mainly a stainless steel sheet, fiber sound absorption materials such as glass wool or stainless steel wool are not used as sound absorption media, the weight of the resistive sound absorption section is reduced, and the processing and the maintenance are facilitated.
Claims (7)
1. The utility model provides a double-deck microperforated pipe sound absorbing device of environment-friendly which characterized in that: including many double-deck micro-perforated pipes (2) of noise elimination pipeline (1) and fixed mounting in noise elimination pipeline, an open end of noise elimination pipeline (1) is as the air inlet, and another open end is as the gas outlet, each all has arranged the hole of muffling on the two-layer body of double-deck micro-perforated pipe (2), and the air current that gets into in the noise elimination pipeline from the air inlet can pass through each double-deck micro-perforated pipe sound absorption is discharged from the gas outlet.
2. The environment-friendly double-layered micro-perforated pipe sound absorbing device according to claim 1, wherein: support frames (3) are arranged at two ends of an air inlet and an air outlet of the silencing pipeline (1), and the double-layer micro-perforated pipe (2) is fixedly installed in the silencing pipeline (1) through the support frames.
3. The sound-absorbing device of an environmentally friendly double-layered micro perforated pipe according to claim 1 or 2, wherein: the aperture and the distribution density of the silencing holes on the inner layer of the pipe body are larger than those on the outer layer of the pipe body.
4. The sound-absorbing device of an environmentally friendly double-layered micro perforated pipe according to claim 3, wherein: the double-layer micro-perforated pipe (2) is made of stainless steel materials.
5. The sound-absorbing device of an environmentally friendly double-layered micro perforated pipe according to claim 1, 2 or 4, wherein: the diameter of inlayer the body is 40 ~ 100mm, and is outer the diameter of body is 100 ~ 200 mm.
6. The sound-absorbing device of an environmentally friendly double-layered micro perforated pipe according to claim 5, wherein: the thickness of the two layers of pipe bodies of the double-layer micro-perforated pipe is 0.4-1.0 mm, and the aperture of the two layers of pipe bodies is 0.6-1.0 mm.
7. The sound-absorbing device of an environmentally friendly double-layered micro perforated pipe according to claim 1, 2, 4 or 6, wherein: the perforation rate of the silencing holes of the two layers of pipe bodies is between 1 and 5 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120044377.2U CN215495992U (en) | 2021-01-08 | 2021-01-08 | Environment-friendly double-layer micro-perforated pipe sound absorption device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120044377.2U CN215495992U (en) | 2021-01-08 | 2021-01-08 | Environment-friendly double-layer micro-perforated pipe sound absorption device |
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| CN215495992U true CN215495992U (en) | 2022-01-11 |
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| CN202120044377.2U Active CN215495992U (en) | 2021-01-08 | 2021-01-08 | Environment-friendly double-layer micro-perforated pipe sound absorption device |
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2021
- 2021-01-08 CN CN202120044377.2U patent/CN215495992U/en active Active
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