CN109931297A - Metope exhaust fan composite muffler - Google Patents
Metope exhaust fan composite muffler Download PDFInfo
- Publication number
- CN109931297A CN109931297A CN201711364076.2A CN201711364076A CN109931297A CN 109931297 A CN109931297 A CN 109931297A CN 201711364076 A CN201711364076 A CN 201711364076A CN 109931297 A CN109931297 A CN 109931297A
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- China
- Prior art keywords
- inserted sheet
- noise elimination
- metope
- elimination inserted
- low frequency
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- 239000002131 composite material Substances 0.000 title claims abstract description 13
- 230000008030 elimination Effects 0.000 claims abstract description 41
- 238000003379 elimination reaction Methods 0.000 claims abstract description 41
- 230000003584 silencer Effects 0.000 claims abstract description 34
- 239000011491 glass wool Substances 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 238000004080 punching Methods 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 230000030279 gene silencing Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000008034 disappearance Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011234 economic evaluation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Duct Arrangements (AREA)
- Exhaust Silencers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
It includes bend muffler, low frequency strip-type silencer, installation heavy frame, protective net that the present invention, which discloses a kind of metope exhaust fan composite muffler, and bend muffler is mounted on outside metope exhaust outlet, and low frequency strip-type silencer is vertically mounted under bend muffler.Low frequency strip-type silencer includes total plate flange straight tube, noise elimination inserted sheet, noise elimination inserted sheet by 60~100kg/m3 of bulk density super glass wool plate, the weather-proof film of overcoating 0.02mm thickness, protection slab is the perforated metal panel that aperture 6mm punching rate is 25%, noise elimination inserted sheet with a thickness of 50~70mm, setting is arc-shaped at the top of noise elimination inserted sheet, and the piece spacing of noise elimination inserted sheet is two times of noise elimination inserted sheet thickness, and the distance of noise elimination inserted sheet plate flange straight pipe wall together is the half of the piece spacing of noise elimination inserted sheet.The whole sound deadening capacity of silencer can be improved under the premise of meeting and improving Middle and low frequency noise attenuation.It is small with flow resistance, sound deadening capacity is big, deadening frequency band is wide, the advantage of mounting process simplicity.
Description
Technical field
The present invention relates to a kind of silencers, are in particular arranged at metope exhaust fan composite muffler.
Background technique
Exhaust fan drives fan blade to rotate certain driving air-flow by motor, a kind of air conditioning electricity for exchanging indoor and outdoor air
Device.Also known as draft fan, ventilation fan etc..The purpose of air draft seeks to remove indoor foul atmosphere, adjusts temperature, humidity and feeling
Effect.Exhaust fan is widely used in family, public place and industrial premises.
Wideband noise of the exhaust fan noise based on Middle and low frequency noise, middle low frequency noise is different from high frequency noise, high frequency
Noise can decay rapidly, such as the point sound source of high frequency noise, every 10 meters of distances can decline as distance is remoter or meets with barrier
6dB(A).And middle low frequency noise successively decreases very slow, sound wave is again longer, can pass through barrier easily, long range long-range raid and through walls
Transmural directly enters human ear.
Blower strikes opposing stationary air by blade shape and inclination angle to form air flowing.The air force of blower
Property noise can be divided into two parts, i.e. rotational noise and eddy current crack, full range noise of the noise frequency based on middle low frequency, with wind
The revolving speed and the piece number of machine blade are related, and the noise of air outlet is greater than about 5~10 dB(A of air inlet noise).Due to exhaust fan system
Air draft outward, so exhaust fan noise directly affects the acoustic environment of surrounding.Especially adjacent residential block, to people's life, rest band
Carry out very big interference, causes complaint event repeatedly.
And exhaust fan total pressure is generally 100Pa~200Pa or so, it is more sensitive to the air loss of setting silencer.Institute
With the crushing using existing exhaust duct silencer is larger, and it is impacted to will lead to discharge amount.
Summary of the invention
In order to eliminate the influence that exhaust fan noise on human live, rest.It is compound that the present invention provides a kind of metope exhaust fan
Silencer, which, which has, effectively cuts down exhaust fan Middle and low frequency noise, meanwhile, air loss is small, and mounting process is easy.
The technical solution adopted by the present invention to solve the technical problems is: a kind of metope exhaust fan composite muffler includes disappearing
Sound elbow, low frequency strip-type silencer, installation heavy frame, protective net, bend muffler are mounted on outside metope exhaust outlet, and low frequency chip disappears
Sound device is vertically mounted under bend muffler.Low frequency strip-type silencer includes total plate flange straight tube, noise elimination inserted sheet, and noise elimination inserted sheet is by holding
The super glass wool plate of 60~110kg/m3 is weighed, is cladded with the weather-proof film of 0.02mm thickness, protection slab is that aperture 6mm punching rate is
20% perforated metal panel, setting is arc-shaped at the top of noise elimination inserted sheet, noise elimination inserted sheet with a thickness of 50~70mm, the piece of noise elimination inserted sheet
Spacing is two times of noise elimination inserted sheet thickness, and the distance of noise elimination inserted sheet plate flange straight pipe wall together is the two of the piece spacing of noise elimination inserted sheet
/ mono-.
According to the spectral characteristic of exhaust fan noise, super glass wool plate bulk density is selected, when low-frequency component ratio is higher, choosing
The super glass wool plate for being 110kg/m3 with bulk density, when low-frequency component ratio is lower, selecting bulk density is the ultra-fine glass of 60kg/m3
Glass cotton plate.The bulk density that super glass wool in anechoic sheet is improved in the case where keeping noise elimination inserted sheet thickness can be improved low cut
Amount.The bulk density that super glass wool is improved in the case where reducing noise elimination inserted sheet thickness, is able to maintain low cut amount.Disappearance inserted sheet
Top setting is in the arc-shaped, to reduce the resistance coefficient of disappearance inserted sheet, reduces air loss.
The ratio of the sectional area of the silencing channel effective area and silencer of low frequency strip-type silencer is greater than 60%, eliminates the noise logical
Road effective area is greater than exhaust fan outlet air open area 60%.Silencing channel wind speed is effectively reduced, reduces the silencer pressure loss, out
Wind wind speed is low, effectively reduces outlet air dynamic pressure.
Reach optimal " review number".It is referred to as " review number according to efficiency and Economic Evaluation silencer", it eliminates the noise
Amount is big, and review number is just high, and silencer sectional area and airflow line sectional area ratio are bigger, and review number is with regard to low.=/ (/),
Wherein:- silencer sound deadening capacity (dB)；- silencer sectional area (m2)；- airflow line sectional area (m2).
Bend muffler includes total plate flange blast pipe elbow and the sound absorption structure for being mounted on inner side of elbow and two sides, sound absorption structure
By the extra-fine glass-wool felt of bulk density 48kg/m3, it is cladded with the weather-proof film of 0.02mm thickness, protection slab is that aperture 6mm punching rate is 20%
Perforated metal panel.
Using the weather-proof film of 0.02mm thickness, compared to the absorption that Middle and low frequency noise can be improved in overcoating glass cloth, meanwhile, it is right
The influence that high-frequency noise absorbs is smaller.But when using more than the weather-proof film of 0.02mm thickness, generation will be absorbed to high-frequency noise
Detrimental effect.
The air inlet of bend muffler is rectangle, and the height of air inlet is greater than metope exhaust outlet diameter, the width of air inlet
Greater than the height of air inlet.
Noise elimination inserted sheet length is 500~1000mm, and noise elimination inserted sheet is vertically mounted in total plate flange straight tube, flat with metope
Row.According to the requirement of sound deadening capacity, allows air loss and at a distance from sensitive spot, determine noise elimination inserted sheet length.
Installation heavy frame is mounted on metope, and protective net is mounted on low frequency strip-type silencer bottom, low frequency strip-type silencer bottom
Bolt fastening is used between portion and installation heavy frame plane.
Metope exhaust fan composite muffler forms series specification, the T35-11 system produced with Guangdong Zhaoqing Deton Co., Ltd.
For column low-noise axial flow fan: it is corresponding according to exhaust fan series specification, meet blower model by 2.8A~11.2A, air quantity
By 826~68000 m3/h, total pressure is by 39~480Pa, and blower outer diameter is by 0.33~1.21m.
The beneficial effects of the present invention are:
1, it can effectively cut down exhaust fan and go out wind noise greater than 20dB(A), silencer attenuation characteristic and blower outlet air noise spectrum
It matches；
2, silencer protruding wall identity distance improves safety and reduces the influence to landscape from smaller, reduction fitful wind load；
3, have that flow resistance is small, available ventilation amount is big, deadening frequency band is wide；
4, small in size, mounting process is easy.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is that the embodiment of the present invention faces structural map.
Fig. 2 is the side view structural map of the embodiment of the present invention.
Fig. 3 is the vertical view structural map of the embodiment of the present invention.
Fig. 4 is scheme of installation of the embodiment of the present invention.
1. bend muffler in figure, 11. air hose elbows, 12. air inlets, 13. sound absorption structures, 2. low frequency strip-type silencers,
21. plate flange straight tube altogether, 22. noise elimination inserted sheets, 23. super glass wool plates, 24. is arc-shaped, 25. spacing, 26. silencing channels, 3.
Heavy frame, 4. exhaust fans, 41. metopes, 42. exhaust outlets are installed.
Specific embodiment
In the embodiment shown in Fig. 1,2,3, a kind of metope exhaust fan composite muffler includes bend muffler 1, low frequency piece
Formula silencer 2, installation heavy frame 3, protective net 31, bend muffler 1 are mounted on outside 41 exhaust outlet 42 of metope, low frequency strip-type silencer
2 are vertically mounted under bend muffler 1.Low frequency strip-type silencer 2 includes total plate flange straight tube 21, noise elimination inserted sheet 22, noise elimination inserted sheet
22 by 60~100kg/m3 of bulk density super glass wool plate 23, be cladded with the weather-proof film of 0.02mm thickness, protection slab is worn for aperture 6mm
The perforated metal panel that porosity is 20%, setting arc-shaped 24 at the top of disappearance inserted sheet, noise elimination inserted sheet 22 with a thickness of 50~70mm, disappear
Spacing 25 between sound inserted sheet 22 is two times of 22 thickness of noise elimination inserted sheet, the distance of 21 wall of plate flange straight tube together of noise elimination inserted sheet 22
For the half of the piece spacing 25 of noise elimination inserted sheet.
The ratio of the sectional area of 26 effective area of silencing channel and silencer of low frequency strip-type silencer 2 is greater than 60%, eliminates the noise
26 effective area of channel is greater than 4 area 60% of exhaust fan air outlet.
Bend muffler 1 includes total plate flange blast pipe elbow 11 and the sound absorption structure 13 for being mounted on inner side of elbow and two sides, is inhaled
Acoustic form 13 is cladded with the weather-proof film of 0.02mm thickness by the extra-fine glass-wool felt of bulk density 48kg/m3, and protection slab is that aperture 6mm is worn
The perforated metal panel that porosity is 25%.The air inlet 12 of bend muffler is rectangle, and it is straight that the height of air inlet 12 is greater than exhaust outlet 42
Diameter, the width of air inlet 12 are greater than the height of air inlet 12.
22 length of noise elimination inserted sheet is 500~1000mm, and noise elimination inserted sheet 22 is vertically mounted in total plate flange straight tube 21, with wall
Face 41 is parallel.
In Fig. 4, installation heavy frame 3 is mounted on metope 41, and protective net is mounted on 2 bottom of low frequency strip-type silencer, low frequency
Bolt fastening is used between 2 bottom of strip-type silencer and installation 3 plane of heavy frame.
It should be appreciated that without departing from the scope of the present invention, a variety of changes can be made to above-described embodiment.It is all in this hair
Made any modifications, equivalent replacements, and improvements etc., should be included in protection scope of the present invention within bright spirit and principle
Within.
Claims (6)
1. a kind of metope exhaust fan composite muffler includes bend muffler, low frequency strip-type silencer, installs heavy frame, protective net,
Bend muffler is mounted on outside metope exhaust outlet, and low frequency strip-type silencer is vertically mounted under bend muffler, it is characterized in that: low frequency piece
Formula silencer include altogether plate flange straight tube, noise elimination inserted sheet, noise elimination inserted sheet by 60~110kg/m3 of bulk density super glass wool plate, outside
Cover the weather-proof film of 0.02mm thickness, protection slab is the perforated metal panel that aperture 6mm punching rate is 20%, noise elimination inserted sheet with a thickness of
50~70mm, the top setting of noise elimination inserted sheet is arc-shaped, and the piece spacing of noise elimination inserted sheet is two times of noise elimination inserted sheet thickness, noise elimination inserted sheet
The distance of plate flange straight pipe wall is the half of the piece spacing of noise elimination inserted sheet together.
2. metope exhaust fan composite muffler according to claim 1, it is characterized in that: the noise elimination of low frequency strip-type silencer is logical
The ratio of the sectional area of road effective area and silencer is greater than 60%, and silencing channel effective area is greater than exhaust fan outlet air open area
60%。
3. metope exhaust fan composite muffler according to claim 1, it is characterized in that: bend muffler includes total plate flange wind
Pipe bend and the sound absorption structure for being mounted on inner side of elbow and two sides, sound absorption structure by bulk density 48kg/m3 extra-fine glass-wool felt, outside
The weather-proof film of 0.02mm thickness is covered, protection slab is the perforated metal panel that aperture 6mm punching rate is 20%.
4. metope exhaust fan composite muffler according to claim 1, it is characterized in that: the air inlet of bend muffler is rectangular
Shape, the height of air inlet are greater than metope exhaust outlet diameter, and the width of air inlet is greater than the height of air inlet.
5. metope exhaust fan composite muffler according to claim 1, it is characterized in that: noise elimination inserted sheet length be 500~
1000mm, noise elimination inserted sheet is vertically mounted in total plate flange straight tube, parallel with metope.
6. metope exhaust fan composite muffler according to claim 1, it is characterized in that: installation heavy frame is mounted on metope,
Protective net is mounted on low frequency strip-type silencer bottom, uses bolt between low frequency strip-type silencer bottom and installation heavy frame plane
Fastening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711364076.2A CN109931297B (en) | 2017-12-18 | 2017-12-18 | Wall exhaust fan composite muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711364076.2A CN109931297B (en) | 2017-12-18 | 2017-12-18 | Wall exhaust fan composite muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109931297A true CN109931297A (en) | 2019-06-25 |
| CN109931297B CN109931297B (en) | 2024-06-04 |
Family
ID=66982406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711364076.2A Active CN109931297B (en) | 2017-12-18 | 2017-12-18 | Wall exhaust fan composite muffler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109931297B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87211863U (en) * | 1987-08-12 | 1988-09-28 | 沈世莹 | Low-resistance and corrosion resistant damper bend |
| JPH07305974A (en) * | 1994-05-12 | 1995-11-21 | Kuken Kogyo Kk | Silencer |
| CN102522079A (en) * | 2012-01-10 | 2012-06-27 | 厦门嘉达环保建造工程有限公司 | Impedance compound right-angled muffler |
| CN203654206U (en) * | 2013-12-19 | 2014-06-18 | 森特士兴集团股份有限公司 | Full-closed sound barrier ventilating system |
| CN204164042U (en) * | 2014-09-30 | 2015-02-18 | 国网上海市电力公司 | A kind of air exhausting soundproofing elbow for 35kV transformer chamber |
| CN104870827A (en) * | 2012-12-25 | 2015-08-26 | 松下知识产权经营株式会社 | Centrifugal fan, and fan equipped with sound-muffling box and using centrifugal fan |
| CN207879717U (en) * | 2017-12-18 | 2018-09-18 | 厦门嘉达环保建造工程有限公司 | Metope exhaust fan composite muffler |
-
2017
- 2017-12-18 CN CN201711364076.2A patent/CN109931297B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87211863U (en) * | 1987-08-12 | 1988-09-28 | 沈世莹 | Low-resistance and corrosion resistant damper bend |
| JPH07305974A (en) * | 1994-05-12 | 1995-11-21 | Kuken Kogyo Kk | Silencer |
| CN102522079A (en) * | 2012-01-10 | 2012-06-27 | 厦门嘉达环保建造工程有限公司 | Impedance compound right-angled muffler |
| CN104870827A (en) * | 2012-12-25 | 2015-08-26 | 松下知识产权经营株式会社 | Centrifugal fan, and fan equipped with sound-muffling box and using centrifugal fan |
| CN203654206U (en) * | 2013-12-19 | 2014-06-18 | 森特士兴集团股份有限公司 | Full-closed sound barrier ventilating system |
| CN204164042U (en) * | 2014-09-30 | 2015-02-18 | 国网上海市电力公司 | A kind of air exhausting soundproofing elbow for 35kV transformer chamber |
| CN207879717U (en) * | 2017-12-18 | 2018-09-18 | 厦门嘉达环保建造工程有限公司 | Metope exhaust fan composite muffler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109931297B (en) | 2024-06-04 |
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