CN109931297A - Metope exhaust fan composite muffler - Google Patents

Metope exhaust fan composite muffler Download PDF

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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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CN
China
Prior art keywords
inserted sheet
noise elimination
metope
elimination inserted
low frequency
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
Application number
CN201711364076.2A
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Chinese (zh)
Inventor
林洁
林嘉祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Jiada Environmental Protection Technology Co Ltd
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Xiamen Jiada Environmental Protection Technology Co Ltd
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Publication date
Application filed by Xiamen Jiada Environmental Protection Technology Co Ltd filed Critical Xiamen Jiada Environmental Protection Technology Co Ltd
Priority to CN201711364076.2A priority Critical patent/CN109931297A/en
Publication of CN109931297A publication Critical patent/CN109931297A/en
Pending legal-status Critical Current

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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

Metope exhaust fan composite muffler
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.
CN201711364076.2A 2017-12-18 2017-12-18 Metope exhaust fan composite muffler Pending CN109931297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711364076.2A CN109931297A (en) 2017-12-18 2017-12-18 Metope exhaust fan composite muffler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711364076.2A CN109931297A (en) 2017-12-18 2017-12-18 Metope exhaust fan composite muffler

Publications (1)

Publication Number Publication Date
CN109931297A true CN109931297A (en) 2019-06-25

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CN201711364076.2A Pending CN109931297A (en) 2017-12-18 2017-12-18 Metope exhaust fan composite muffler

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CN (1) CN109931297A (en)

Citations (7)

* Cited by examiner, † Cited by third party
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
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

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