CN113606193A - Low-frequency silencer in centrifugal fan - Google Patents
Low-frequency silencer in centrifugal fan Download PDFInfo
- Publication number
- CN113606193A CN113606193A CN202111101140.4A CN202111101140A CN113606193A CN 113606193 A CN113606193 A CN 113606193A CN 202111101140 A CN202111101140 A CN 202111101140A CN 113606193 A CN113606193 A CN 113606193A
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- perforated plates
- fixedly connected
- shell
- low
- silencer
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- 230000003584 silencer Effects 0.000 title claims abstract description 35
- 230000030279 gene silencing Effects 0.000 claims abstract description 16
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 8
- 239000008397 galvanized steel Substances 0.000 claims description 8
- 230000001743 silencing effect Effects 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008030 elimination Effects 0.000 description 9
- 238000003379 elimination reaction Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of silencers, in particular to a low-frequency silencer in a centrifugal fan, which aims at the problems that the silencing effect of most of the conventional silencers in the prior art is limited by using a single silencing principle, namely resistance silencing or reactive silencing, and the low-frequency silencing effect of most of the silencers is poor, the silencer comprises a shell, five first perforated plates are fixedly connected on the inner wall of the shell, four second perforated plates are fixedly connected on the inner wall of the shell, the second perforated plates and the first perforated plates are alternately arranged, the second perforated plates and the first perforated plates are fixedly connected, the silencer simultaneously eliminates high-frequency noise and medium-low frequency noise in the centrifugal fan through a simple structure, and also achieves an ideal low-frequency silencing effect through repeated sudden area change, the noise reduction effect is better, and the noise reduction is more thorough.
Description
Technical Field
The invention relates to the technical field of silencers, in particular to a low-frequency silencer in a centrifugal fan.
Background
The silencer is used for the airflow pipeline with noise transmission, and the noise in the pipeline is attenuated or reflected by using noise reduction devices such as a pipeline and an elbow with sound absorption linings or a pipeline with suddenly changed sectional area and other discontinuous acoustic impedances.
At present, the noise elimination principle of a conventional silencer is mostly designed to utilize a single noise elimination principle, namely, resistive noise elimination or reactive noise elimination, so that the noise elimination effect is relatively limited, and most silencers have poor low-frequency noise elimination effect. Therefore, a low-frequency silencer in a centrifugal fan is provided.
Disclosure of Invention
The invention aims to solve the problems that the silencing effect is limited and the low-frequency silencing effect of most silencers is poor due to the fact that the silencing principle of a conventional silencer in the prior art is mostly designed to be a single silencing principle, either resistive silencing or reactive silencing, and the traditional silencer is provided with a low-frequency silencer in a centrifugal fan.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a low frequency muffler in centrifugal fan, includes the shell, five first perforated plates of fixedly connected with on the inner wall of shell, four second perforated plates of fixedly connected with on the inner wall of shell, be setting in turn between second perforated plate and the first perforated plate, fixed connection between second perforated plate and the first perforated plate, a plurality of round holes have been seted up on the first perforated plate, the hole of eliminating noise has been seted up on the second perforated plate, the round hole is linked together with the hole of eliminating noise, the bottom fixedly connected with flange of shell, the top fixedly connected with lamina tecti of shell, the top fixedly connected with conical top apron of lamina tecti, the short tuber pipe of top fixedly connected with of conical top apron, the top fixedly connected with tuber pipe flange of short tuber pipe.
Preferably, the shell, the connecting flange, the top cover plate, the conical top cover plate, the short air pipe, the air pipe flange, the five first perforated plates and the four second perforated plates are all welded, and the parts can be conveniently connected in a welding mode, and the stability among the parts can be improved.
Preferably, the connecting flange, the top cover plate, the conical top cover plate, the short air pipe and the air pipe flange are all made of galvanized steel plates with the thickness of 5mm, and the corrosion resistance and the processability of each part can be improved by using the galvanized steel plates.
Preferably, first perforated plate and second perforated plate all with for 1.2mm thick galvanized steel sheet, the punchhole diameter of second perforated plate is 4mm, and the percent opening is 35%, through setting up the punchhole diameter to 4mm, and the percent opening is 35%, can change the inside air current area of passing through of entering muffler.
Preferably, a plurality of rib plates are welded to the top of the connecting flange, the rib plates are welded to the shell, and the connecting flange and the shell can be connected more stably by the rib plates.
Has the advantages that: by arranging four sections of resistance channels and five sections of resistance channels, the purpose is to achieve an ideal full-band silencing effect through multiple times of impedance transformation;
the silencer is specially used for the radiated noise of an air inlet and an air outlet of a high-pressure centrifuge, a pipeline, an air inlet of a machine room and the like, and can also be used for reducing the noise of a boiler blower;
the silencer simultaneously realizes the elimination of high-frequency noise and medium-low frequency noise in the centrifugal machine through a simple structure, and also achieves ideal low-frequency noise elimination effect through multiple sudden area changes, so that the noise reduction effect is better, and the noise reduction is more thorough.
Drawings
FIG. 1 is a longitudinal sectional view of a low frequency silencer in a centrifugal fan according to the present invention;
FIG. 2 is an enlarged view of the impedance structure of the low frequency silencer in the centrifugal fan according to the present invention;
FIG. 3 is a top view of a low frequency silencer in a centrifugal fan according to the present invention;
FIG. 4 is a cross sectional view of a low frequency silencer in a centrifugal fan according to the present invention;
fig. 5 is a structural three-dimensional view of a low-frequency silencer in a centrifugal fan according to the present invention.
In the figure: the structure comprises a shell 1, a connecting flange 2, a top cover plate 3, a conical top cover plate 4, a short air pipe 5, an air pipe flange 6, a first perforated plate 7, a second perforated plate 8, a round hole 9, a silencing hole 10 and a rib plate 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a low frequency silencer in a centrifugal fan, includes a housing 1, five first perforated plates 7 are fixedly connected to the inner wall of the housing 1, four second perforated plates 8 are fixedly connected to the inner wall of the housing 1, the second perforated plates 8 and the first perforated plates 7 are alternately arranged and alternately arranged between the second perforated plates 8 and the first perforated plates 7, so that low frequency noise and high frequency noise can be eliminated in sections, the second perforated plates 8 are fixedly connected to the first perforated plates 7, a plurality of round holes 9 are formed on the first perforated plates 7, silencing holes 10 are formed on the second perforated plates 8, the round holes 9 are communicated with the silencing holes 10, the flow area of air flow can be changed by forming the round holes 9 and the silencing holes 10, so as to achieve the effect of eliminating noise, a connecting flange 2 is fixedly connected to the bottom of the housing 1, and the connecting flange 2 can play a role in sealing between the silencer and the interior, the silencer is convenient to install, the top of the shell 1 is fixedly connected with a top cover plate 3, the top of the top cover plate 3 is fixedly connected with a conical top cover plate 4, the conical top cover plate 4 can change the flow area of airflow, the top of the conical top cover plate 4 is fixedly connected with a short air pipe 5, and the top of the short air pipe 5 is fixedly connected with an air pipe flange 6;
the shell 1, the connecting flange 2, the top cover plate 3, the conical top cover plate 4, the short air pipe 5, the air pipe flange 6, the five first perforated plates 7 and the four second perforated plates 8 are all welded, and the parts can be conveniently connected and the stability of the parts can be improved in a mode of welding the parts; the connecting flange 2, the top cover plate 3, the conical top cover plate 4, the short air pipe 5 and the air pipe flange 6 are all made of galvanized steel plates with the thickness of 5mm, and the corrosion resistance and the processability of each part can be improved by using the galvanized steel plates; the first perforated plate 7 and the second perforated plate 8 are made of galvanized steel plates with the thickness of 1.2mm, the diameter of holes of the second perforated plate 7 is 4mm, the opening rate is 35%, the diameter of the holes is 4mm, and the opening rate is 35%, so that the passing area of airflow entering the interior of the silencer can be changed; a plurality of rib plates 11 are welded at the top of the connecting flange 2, the rib plates 11 are welded with the shell 1, and the connecting flange 2 and the shell 1 can be connected more stably by arranging the rib plates 11.
The working principle is as follows: the reactive muffler is mainly suitable for reducing the noise of low frequency and medium and low frequency bands; the resistance silencer is mainly suitable for reducing the noise of high frequency band, the silencing principle of the two silencers is single, either resistance silencing or resistance silencing, the silencing effect is limited, most silencers have poor silencing effect on low frequency, the silencer is an impedance composite silencer, the silencer is formed by combining five resistance channels and four resistance channels, the resistance silencer part is used for reducing the low frequency noise below 500Hz, the resistance part is used for reducing the middle-high frequency noise below 500Hz, the silencer is circular, the silencer can be directly connected in series in a ventilation pipeline or connected to the inlet and outlet flange of a high-pressure centrifugal fan, the silencing effect is achieved through multiple impedance transformation, meanwhile, the silencing effect achieved by multiple impedance changes can be enhanced through multiple sudden changes of the air flow circulation area, and the silencing effect is better, the noise reduction is more thorough.
The design is suitable for the air volume of 2000-50000m3/h, the working pressure of 3000-20000Pa and the flow speed of 12-18 m/s; the noise elimination amount is 15-40dB (A);
the local pressure loss is given by the following equation: Δ P ═ ξ (ρ v)2/2g)
The drag coefficient xi is 1.5,
Δ P — local pressure loss Pa,
rho- -gas density, kg/M3In the standard state, the dry air is generally taken as rho 1.29kg/s3；
N- - -gas flow rate, m/S;
g- -acceleration of gravity, typically 9.8m/s2。
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The low-frequency silencer in the centrifugal fan comprises a shell (1) and is characterized in that five first perforated plates (7) are fixedly connected to the inner wall of the shell (1), four second perforated plates (8) are fixedly connected to the inner wall of the shell (1), the second perforated plates (8) and the first perforated plates (7) are alternately arranged, the second perforated plates (8) are fixedly connected with the first perforated plates (7), a plurality of round holes (9) are formed in the first perforated plates (7), silencing holes (10) are formed in the second perforated plates (8), the round holes (9) are communicated with the silencing holes (10), a connecting flange (2) is fixedly connected to the bottom of the shell (1), a top cover plate (3) is fixedly connected to the top of the shell (1), and a conical top cover plate (4) is fixedly connected to the top of the top cover plate (3), the top fixedly connected with short tuber pipe (5) of awl top apron (4), the top fixedly connected with tuber pipe flange (6) of short tuber pipe (5).
2. The low-frequency silencer in the centrifugal fan according to claim 1, wherein the shell (1), the connecting flange (2), the top cover plate (3), the conical top cover plate (4), the short air pipe (5), the air pipe flange (6), the five first perforated plates (7) and the four second perforated plates (8) are all welded.
3. The medium-low frequency silencer of the centrifugal fan according to claim 1, wherein the connecting flange (2), the top cover plate (3), the conical top cover plate (4), the short air pipe (5) and the air pipe flange (6) are all made of galvanized steel plates with a thickness of 5 mm.
4. The low frequency silencer in centrifugal fan according to claim 1, wherein the first perforated plate (7) and the second perforated plate (8) are made of galvanized steel with thickness of 1.2mm, the second perforated plate (7) has hole diameter of 4mm and hole opening rate of 35%.
5. The low-frequency silencer in the centrifugal fan according to claim 1, wherein a plurality of rib plates (11) are welded to the top of the connecting flange (2), and the plurality of rib plates (11) are welded to the casing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111101140.4A CN113606193A (en) | 2021-09-18 | 2021-09-18 | Low-frequency silencer in centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111101140.4A CN113606193A (en) | 2021-09-18 | 2021-09-18 | Low-frequency silencer in centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113606193A true CN113606193A (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111101140.4A Pending CN113606193A (en) | 2021-09-18 | 2021-09-18 | Low-frequency silencer in centrifugal fan |
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| CN (1) | CN113606193A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101668676B1 (en) * | 2015-09-14 | 2016-10-24 | 주식회사 에스코알티에스 | Soundproof panel for decreasing wind load and soundproof wall using the same |
| CN106989069A (en) * | 2017-05-25 | 2017-07-28 | 江苏永益环保科技有限公司 | Blower fan silencer |
| CN108019379A (en) * | 2016-11-02 | 2018-05-11 | 天津瑞祥千弘科技发展有限公司 | A kind of silencing means |
| CN208057376U (en) * | 2018-02-07 | 2018-11-06 | 安徽乐昌气动流体设备科技有限公司 | A kind of pneumatic diaphragm pump silencer |
| CN111102248A (en) * | 2018-10-27 | 2020-05-05 | 四川唯美空间环保科技有限公司 | Silencing and noise-reducing device for workshop of factory building |
| CN111218995A (en) * | 2020-03-05 | 2020-06-02 | 河南科技大学 | Sound insulation board with micro ventilation |
| CN216278679U (en) * | 2021-09-18 | 2022-04-12 | 南京静宝声学科技有限公司 | Low-frequency silencer in centrifugal fan |
-
2021
- 2021-09-18 CN CN202111101140.4A patent/CN113606193A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101668676B1 (en) * | 2015-09-14 | 2016-10-24 | 주식회사 에스코알티에스 | Soundproof panel for decreasing wind load and soundproof wall using the same |
| CN108019379A (en) * | 2016-11-02 | 2018-05-11 | 天津瑞祥千弘科技发展有限公司 | A kind of silencing means |
| CN106989069A (en) * | 2017-05-25 | 2017-07-28 | 江苏永益环保科技有限公司 | Blower fan silencer |
| CN208057376U (en) * | 2018-02-07 | 2018-11-06 | 安徽乐昌气动流体设备科技有限公司 | A kind of pneumatic diaphragm pump silencer |
| CN111102248A (en) * | 2018-10-27 | 2020-05-05 | 四川唯美空间环保科技有限公司 | Silencing and noise-reducing device for workshop of factory building |
| CN111218995A (en) * | 2020-03-05 | 2020-06-02 | 河南科技大学 | Sound insulation board with micro ventilation |
| CN216278679U (en) * | 2021-09-18 | 2022-04-12 | 南京静宝声学科技有限公司 | Low-frequency silencer in centrifugal fan |
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