CN110657129A - Centrifugal fan volute with noise reduction function by adopting perforated plate - Google Patents
Centrifugal fan volute with noise reduction function by adopting perforated plate Download PDFInfo
- Publication number
- CN110657129A CN110657129A CN201911052193.4A CN201911052193A CN110657129A CN 110657129 A CN110657129 A CN 110657129A CN 201911052193 A CN201911052193 A CN 201911052193A CN 110657129 A CN110657129 A CN 110657129A
- Authority
- CN
- China
- Prior art keywords
- perforated plate
- volute
- centrifugal fan
- noise reduction
- damping layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- 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
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- 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
- F04D29/664—Sound attenuation by means of sound absorbing material
Abstract
The invention discloses a centrifugal fan volute capable of reducing noise by adopting a perforated plate, which comprises a volute body, wherein a fan impeller is installed in the volute body and driven by a motor, the volute body is composed of an outer volute and the perforated plate arranged in the outer volute, a damping layer is bonded on the inner surface of the outer volute through glue, a cavity is formed between the damping layer and the perforated plate, a sound absorption material is filled in the cavity, the sound absorption material is acupuncture cotton or sound absorption cotton, and the sound absorption coefficient of the sound absorption material at medium and high frequencies is greater than 0.6. The outer volute of the invention fills the sound absorption material in the cavity between the perforated plate and the damping layer, and the outer volute, the perforated plate and the sound absorption material jointly act, thus achieving the purpose of reducing the noise of the centrifugal fan; meanwhile, the invention can be widely applied to the industrial fields of energy power and the like.
Description
Technical Field
The invention relates to the technical field of noise reduction, in particular to a volute of a centrifugal fan for reducing noise by adopting a perforated plate.
Background
As a power device widely applied to daily life in the twenty-first century, the noise brought by the centrifugal fan can not only reduce the reliability of equipment, but also influence the comfort of people in the using process, and even harm the health of people when the noise is too large. Therefore, after the high-rotation-speed era is taken, the noise gradually becomes an important index of the performance of the centrifugal fan.
The traditional noise reduction measures of the centrifugal fan are various, for example, the method comprises the steps of changing blade wing profiles, arranging impellers with unequal intervals, changing the radius of a volute tongue and the like. On one hand, the noise reduction measures are difficult to implement and have high process requirements; on the other hand, the original flow field characteristic of the centrifugal fan can be changed, so that the efficiency of the fan is reduced. The research and exploration of a new technology suitable for noise reduction of the centrifugal fan have important practical significance for improving the environmental comfort.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a volute of a centrifugal fan for reducing noise by adopting a perforated plate, which solves the problems of high implementation difficulty and high process requirement of the existing noise reduction measures. The perforated plate and the sound absorption material are combined, the damping layer is used at the same time, and the three are applied to the fan volute, so that on one hand, the volute is low in manufacturing cost and low in process requirement, and the original fan structure is not changed; on the other hand, the original flow field characteristic of the fan is not changed, and the noise reduction performance is better.
The technical scheme is as follows: the invention relates to a centrifugal fan volute capable of reducing noise by adopting a perforated plate, which comprises a volute body, wherein a fan impeller is installed in the volute body and driven by a motor, the volute body is composed of an outer volute and the perforated plate arranged in the outer volute, a damping layer is bonded on the inner surface of the outer volute through glue, a cavity is formed between the damping layer and the perforated plate, a sound absorption material is filled in the cavity, the sound absorption material is acupuncture cotton or sound absorption cotton, and the sound absorption coefficient of the sound absorption material at medium and high frequencies is greater than 0.6.
Further, the perforation rate of the perforated plate is 30% -40%. Therefore, the structural strength of the fan volute can be maintained, and the smoothness of the air flow inside the air flow can be maintained.
Further, the motor is fixedly connected with the volute body through a flange.
Further, the thickness of a cavity formed between the damping layer and the perforated plate is 30-50 mm.
Furthermore, the thickness of the damping layer is 10-20 mm.
Furthermore, the perforated plate is made of carbon steel, and the outer volute and the perforated plate are connected through welding. The perforated plate enables most of the noise to enter the chamber through the perforated plate and to be dissipated in the chamber or absorbed by the needle punched cotton or the sound absorption cotton, and then the size of the propagation noise of the volute is reduced.
Furthermore, the outer volute and the damping layer are bonded by HY-308 glue, and the damping layer is a rubber layer.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention combines the perforated plate with the sound absorption material, enlarges the noise elimination frequency band, and forms a noise elimination chamber in the volute structure, so that the fan volute has the noise reduction function; the perforated plate can effectively reduce the noise of a resonance frequency band, the sound absorption material can reduce the noise frequency band to be wider, and the noise reduction effect of the fan volute is better after the perforated plate and the sound absorption material are combined;
2. the invention can change the perforation rate of the perforated plate and the thickness of the sound absorption material, thereby achieving the purpose of changing the noise reduction amount, and simultaneously adding the damping layer on the wall surface of the outer volute, thereby improving the vibration reduction and noise reduction effects;
3. the invention can be widely applied to the industrial fields of energy power and the like, particularly can be used in a ventilation air-conditioning system of a ship, and has an important effect on improving the sound environment comfort.
Drawings
FIG. 1 is a schematic structural diagram of a conventional centrifugal fan;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of the radial structure of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention is further described below with reference to the following figures and examples:
as shown in fig. 1, the existing centrifugal fan includes a volute body 1, a fan impeller 2 is installed in the volute body 1, the fan impeller 2 is driven by a motor 3, the fan impeller 2 is installed at a shaft end of the motor 3, and the volute body 1 and the motor 3 are fixedly connected by a flange.
As shown in fig. 2 and 3, the volute body of the volute of the centrifugal fan of the invention is composed of an outer volute 4 and a perforated plate 5 arranged inside the outer volute 4, the perforated plate 5 is made of carbon steel, the outer volute 4 and the perforated plate 5 are connected by welding, the perforations on the perforated plate 5 are silencing vents, and the perforation rate of the perforated plate 5 is between 30% and 40%, so that the structural strength of the volute of the centrifugal fan can be maintained and the smoothness of the airflow inside the airflow can be maintained;
the inner surface of the outer volute 4 is bonded with a damping layer 6 through HY-308 glue, the damping layer 6 is a rubber layer, the thickness of the damping layer 6 is 10-20 mm, the damping layer 6 can consume energy to achieve the purpose of vibration reduction, a cavity is formed between the damping layer 6 and the perforated plate 5, the thickness of the cavity is 30-50 mm, the cavity is filled with a sound absorbing material 7, the sound absorbing material is acupuncture cotton or sound absorbing cotton, the sound absorbing coefficient of the sound absorbing material 7 at medium and high frequency is greater than 0.6, most of noise enters the cavity through the perforated plate 5 and is dissipated in the cavity or absorbed by the acupuncture cotton or the sound absorbing cotton, and the magnitude of the propagation noise of the volute is reduced.
According to the invention, the perforated plate 5 and the sound absorption material 7 are combined, and the damping layer 6 is used at the same time, so that the perforated plate, the sound absorption material and the damping layer are applied to the volute of the fan, and on one hand, the volute is low in manufacturing cost and low in process requirement, and the original fan structure is not changed; on the other hand, the original flow field characteristic of the fan is not changed, and the noise reduction performance is better.
Claims (7)
1. The utility model provides an adopt perforated plate to fall centrifugal fan spiral case of making an uproar, includes the spiral case body, this internal fan wheel of installing of spiral case, fan wheel passes through motor drive, its characterized in that: the spiral case body comprises outer spiral case and the perforated plate that sets up in outer spiral case inside, the internal surface of outer spiral case bonds through glue has one deck damping layer, form a cavity between damping layer and the perforated plate, the cavity intussuseption is filled with sound absorbing material, sound absorbing material is acupuncture cotton or sound absorbing cotton, and sound absorption coefficient when sound absorbing material is at the medium-high frequency is greater than 0.6.
2. The volute of a centrifugal fan with perforated plate noise reduction according to claim 1, wherein: the perforation rate of the perforated plate is 30-40%.
3. The volute of a centrifugal fan with perforated plate noise reduction according to claim 1, wherein: the motor is fixedly connected with the volute body through a flange.
4. The volute of a centrifugal fan with perforated plate noise reduction according to claim 1, wherein: the thickness of a cavity formed between the damping layer and the perforated plate is 30-50 mm.
5. The volute of a centrifugal fan with perforated plate noise reduction according to claim 1, wherein: the thickness of damping layer is 10 ~ 20 mm.
6. The volute of a centrifugal fan with perforated plate noise reduction according to claim 1, wherein: the perforated plate material is carbon steel, and the outer volute and the perforated plate are connected through welding.
7. The volute of a centrifugal fan with perforated plate noise reduction according to claim 1, wherein: the outer volute and the damping layer are bonded by HY-308 glue, and the damping layer is a rubber layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911052193.4A CN110657129A (en) | 2019-10-31 | 2019-10-31 | Centrifugal fan volute with noise reduction function by adopting perforated plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911052193.4A CN110657129A (en) | 2019-10-31 | 2019-10-31 | Centrifugal fan volute with noise reduction function by adopting perforated plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110657129A true CN110657129A (en) | 2020-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911052193.4A Pending CN110657129A (en) | 2019-10-31 | 2019-10-31 | Centrifugal fan volute with noise reduction function by adopting perforated plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110657129A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220228600A1 (en) * | 2021-01-15 | 2022-07-21 | Broan-Nutone Llc | Sound dampening scroll for a fan |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB967100A (en) * | 1961-07-01 | 1964-08-19 | Daimler Benz Ag | Improvements relating to fans |
| CN2073503U (en) * | 1990-09-15 | 1991-03-20 | 烟台环保噪声治理厂 | Noise-eliminating device for air-blower |
| CN201277205Y (en) * | 2008-10-24 | 2009-07-22 | 昆明理工大学 | Denoising centrifugal ventilation machine |
| CN201671853U (en) * | 2010-04-29 | 2010-12-15 | 中国船舶重工集团公司第七一二研究所 | Low-noise ventilator |
| CN203051227U (en) * | 2013-01-05 | 2013-07-10 | 华北电力大学（保定） | Low-noise centrifugal ventilating fan enclosure |
| CN104314874A (en) * | 2014-10-16 | 2015-01-28 | 珠海格力电器股份有限公司 | Volute and fan comprising volute |
| CN108119410A (en) * | 2017-12-28 | 2018-06-05 | 南京磁谷科技有限公司 | A kind of combined type muffler plate for high-speed centrifugal fan cabinet |
-
2019
- 2019-10-31 CN CN201911052193.4A patent/CN110657129A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB967100A (en) * | 1961-07-01 | 1964-08-19 | Daimler Benz Ag | Improvements relating to fans |
| CN2073503U (en) * | 1990-09-15 | 1991-03-20 | 烟台环保噪声治理厂 | Noise-eliminating device for air-blower |
| CN201277205Y (en) * | 2008-10-24 | 2009-07-22 | 昆明理工大学 | Denoising centrifugal ventilation machine |
| CN201671853U (en) * | 2010-04-29 | 2010-12-15 | 中国船舶重工集团公司第七一二研究所 | Low-noise ventilator |
| CN203051227U (en) * | 2013-01-05 | 2013-07-10 | 华北电力大学（保定） | Low-noise centrifugal ventilating fan enclosure |
| CN104314874A (en) * | 2014-10-16 | 2015-01-28 | 珠海格力电器股份有限公司 | Volute and fan comprising volute |
| CN108119410A (en) * | 2017-12-28 | 2018-06-05 | 南京磁谷科技有限公司 | A kind of combined type muffler plate for high-speed centrifugal fan cabinet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220228600A1 (en) * | 2021-01-15 | 2022-07-21 | Broan-Nutone Llc | Sound dampening scroll for a fan |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200107 |
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| RJ01 | Rejection of invention patent application after publication |