CN211202430U - Broadband silencer for centrifugal fan - Google Patents
Broadband silencer for centrifugal fan Download PDFInfo
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- CN211202430U CN211202430U CN201921813976.5U CN201921813976U CN211202430U CN 211202430 U CN211202430 U CN 211202430U CN 201921813976 U CN201921813976 U CN 201921813976U CN 211202430 U CN211202430 U CN 211202430U
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Abstract
The utility model relates to the technical field of silencers, in particular to a broadband silencer for a centrifugal fan, which comprises a silencer body, wherein two ends of the silencer body are connected with a reducer pipe, the other side of the reducer pipe is connected with a flange, the outer side of an inner wall pore plate of the silencer body is provided with a shell steel plate, the inner wall of the shell steel plate is coated with a damping layer, the side of the inner wall pore plate, which is close to the shell steel plate, is provided with alkali-free glass silk cloth, a cavity between the inner wall pore plate and the shell steel plate is filled with a first centrifugal glass cotton layer and a second centrifugal glass cotton layer, the first centrifugal glass cotton layer is tightly attached to the damping layer, the second centrifugal glass cotton layer is tightly attached to the inner wall pore plate, a sound absorption sheet is arranged inside the silencer body, and the, and middle-layer sound-absorbing glass wool is filled between the first layer of sound-absorbing glass wool and the second layer of sound-absorbing glass wool. The utility model has the advantages that: the silencing effect is good, the silencing quantity can reach 35-45dB (A), and the resistance is less than 100 Pa.
Description
Technical Field
The utility model relates to a silencer technical field, in particular to wide band silencer for centrifugal fan.
Background
Along with the improvement of environmental protection requirements, the requirements on environmental noise are more and more strict, the labor environment of workers and the quiet life environment of residents are improved, the existing silencer has unsatisfactory effect due to high airflow noise of the centrifugal fan, and the silencer with large silencing quantity is urgently needed to eliminate the airflow noise of the centrifugal fan.
Disclosure of Invention
In order to solve the problems of the prior art, the utility model provides a simple structure, noise cancelling effect is good wide band silencer for centrifugal fan.
The technical scheme of the utility model as follows:
a wide-band silencer for a centrifugal fan comprises a silencer body, wherein two ends of the silencer body are connected with a reducer pipe, the other side of the reducer pipe is connected with a flange, a shell steel plate is arranged on the outer side of an inner wall pore plate of the silencer body, a damping layer is coated on the inner wall of the shell steel plate, alkali-free glass fiber cloth is arranged on the inner wall pore plate close to the side of the shell steel plate, a cavity between the inner wall pore plate and the shell steel plate is filled with a first centrifugal glass cotton layer and a second centrifugal glass cotton layer, the first centrifugal glass cotton layer is tightly attached to the damping layer, the second centrifugal glass cotton layer is tightly attached to the inner wall pore plate, a sound absorption sheet is arranged inside the silencer body, a first layer of sound absorption glass cotton and a second layer of sound absorption glass cotton are filled inside the sound absorption sheet, and an intermediate layer of sound absorption glass cotton is filled between the first layer of sound absorption glass cotton and the second layer of sound absorption, the volume weight of the middle layer sound absorption glass wool is larger than that of the first layer sound absorption glass wool and that of the second layer sound absorption glass wool, so that the best noise elimination effect of low frequency, medium frequency and high frequency is realized, and the inner wall of the sound absorption sheet is provided with alkali-free glass silk cloth.
The two ends of the sound absorption sheet are at 60-degree angles, so that a good backflow effect can be formed, and resistance loss is reduced.
The total thickness of the first centrifugal glass wool layer and the second centrifugal glass wool layer is 100-200mm, and the optimal sound absorption and sound insulation effect of the inner wall layer of the silencer shell is ensured.
The thickness of the sound absorption sheet is 80-300 mm.
The volume weight of the first centrifugal glass wool layer is larger than that of the second centrifugal glass wool layer.
The sound absorption sheet is in one of a cross shape, a well shape and a river shape.
The thickness of the damping layer is 3-6 mm.
The inner wall pore plate is a steel plate with the thickness of 1-1.5mm, and the perforation rate of the inner wall pore plate is 25%.
The silencer body is rectangular or circular.
The utility model provides a beneficial effect that technical scheme brought is:
through the arrangement of the first centrifugal glass wool layer and the second centrifugal glass wool layer with different volume weights in the silencer body, the arrangement of the first layer of sound absorption glass wool, the middle layer of sound absorption glass wool and the second layer of sound absorption glass wool in the sound absorption sheet, the sound attenuation effect is good, the sound attenuation amount can reach 35-45dB (A), and the resistance is less than 100 Pa.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a broadband muffler for a centrifugal fan comprises a muffler body, wherein two ends of the muffler body are connected with a reducer pipe 1, the other side of the reducer pipe 1 is connected with a flange 2, a shell steel plate 4 is arranged on the outer side of an inner wall pore plate 3 of the muffler body, a damping layer is coated on the inner wall of the shell steel plate 4, an alkali-free glass fiber cloth is arranged on the inner wall pore plate 3 close to the shell steel plate 4, a cavity between the inner wall pore plate 3 and the shell steel plate 4 is filled with a first centrifugal glass wool layer 6 and a second centrifugal glass wool layer 7, the first centrifugal glass wool layer 6 is tightly attached to the damping layer, the second centrifugal glass wool layer 7 is tightly attached to the inner wall pore plate 3, a sound absorption sheet 8 is arranged in the muffler body, and a first layer of sound absorption glass wool 9 and a second layer of sound absorption glass wool 10 are filled in the sound absorption sheet 8, the sound absorption piece is characterized in that middle layer sound absorption glass wool 11 is filled between the first layer sound absorption glass wool 9 and the second layer sound absorption glass wool 10, the volume weight of the middle layer sound absorption glass wool 11 is larger than the volume weight of the first layer sound absorption glass wool 9 and the volume weight of the second layer sound absorption glass wool 10, the best noise elimination effect of low frequency, medium frequency and high frequency is achieved, and alkali-free glass silk cloth is arranged on the inner wall of the sound absorption piece 8.
The two ends of the sound absorption sheet 8 are at 60-degree angles, so that a good backflow effect can be formed, and resistance loss is reduced.
The total thickness of the first centrifugal glass wool layer 6 and the second centrifugal glass wool layer 7 is 100-200mm, and the optimal sound absorption and sound insulation effect of the inner wall layer of the silencer shell is ensured.
The thickness of the sound absorption sheet 8 is 80-300 mm.
The volume weight of the first centrifugal glass wool layer 6 is larger than that of the second centrifugal glass wool layer 7.
The sound absorption sheet 8 is in one of a cross shape, a well shape and a river shape.
The thickness of the damping layer is 3-6 mm.
The inner wall pore plate 3 is a steel plate with the thickness of 1-1.5mm, and the perforation rate of the inner wall pore plate 3 is 25%.
The silencer body is rectangular or circular.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. A wide band silencer for a centrifugal fan comprises a silencer body, wherein two ends of the silencer body are connected with a reducer pipe, the other side of the reducer pipe is connected with a flange, a shell steel plate is arranged on the outer side of an inner wall pore plate of the silencer body, and the wide band silencer is characterized in that a damping layer is coated on the inner wall of the shell steel plate, alkali-free glass fiber cloth is arranged on the inner wall pore plate close to the side of the shell steel plate, a cavity between the inner wall pore plate and the shell steel plate is filled with a first centrifugal glass wool layer and a second centrifugal glass wool layer, the first centrifugal glass wool layer is tightly attached to the damping layer, the second centrifugal glass wool layer is tightly attached to the inner wall pore plate, a sound absorption sheet is arranged inside the silencer body, the first layer of sound absorption glass wool and the second layer of sound absorption glass wool are filled inside the sound absorption sheet, and an intermediate layer of sound absorption glass wool is filled between the first layer of sound absorption glass wool and the second, the volume weight of the middle layer sound absorption glass wool is larger than that of the first layer sound absorption glass wool and that of the second layer sound absorption glass wool, and the inner wall of the sound absorption sheet is provided with alkali-free glass fiber cloth.
2. The broadband muffler for a centrifugal fan according to claim 1, wherein both ends of the sound absorbing sheet are at an angle of 60 °.
3. The broadband muffler for the centrifugal fan as claimed in claim 1, wherein the total thickness of the first centrifugal glass wool layer and the second centrifugal glass wool layer is 100-200 mm.
4. The broadband muffler for the centrifugal fan as claimed in claim 1 or 2, wherein the thickness of the sound absorbing sheet is 80-300 mm.
5. The broadband muffler for the centrifugal fan according to claim 1 or 3, wherein the volume weight of the first centrifugal glass wool layer is larger than that of the second centrifugal glass wool layer.
6. The broadband silencer for the centrifugal fan according to claim 1 or 2, wherein the sound absorption sheet is one of a cross shape, a well shape and a Sichuan shape.
7. The broadband muffler for the centrifugal fan according to claim 1, wherein the thickness of the damping layer is 3-6 mm.
8. The broadband muffler for the centrifugal fan according to claim 1, wherein the inner wall orifice plate is a steel plate with a thickness of 1-1.5mm, and the perforation rate of the inner wall orifice plate is 25%.
9. The broadband muffler for a centrifugal fan as claimed in claim 1, wherein the muffler body is rectangular or circular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921813976.5U CN211202430U (en) | 2019-10-22 | 2019-10-22 | Broadband silencer for centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921813976.5U CN211202430U (en) | 2019-10-22 | 2019-10-22 | Broadband silencer for centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211202430U true CN211202430U (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921813976.5U Active CN211202430U (en) | 2019-10-22 | 2019-10-22 | Broadband silencer for centrifugal fan |
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| CN (1) | CN211202430U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927831A (en) * | 2020-07-17 | 2020-11-13 | 北方华锦化学工业股份有限公司 | Silencer for treating noise of centrifugal fan |
| CN114412841A (en) * | 2022-01-17 | 2022-04-29 | 山东洁静环保设备有限公司 | Blowback deashing formula dust exhausting fan composite muffler |
-
2019
- 2019-10-22 CN CN201921813976.5U patent/CN211202430U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927831A (en) * | 2020-07-17 | 2020-11-13 | 北方华锦化学工业股份有限公司 | Silencer for treating noise of centrifugal fan |
| CN114412841A (en) * | 2022-01-17 | 2022-04-29 | 山东洁静环保设备有限公司 | Blowback deashing formula dust exhausting fan composite muffler |
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