CN207879717U - Metope exhaust fan composite muffler - Google Patents
Metope exhaust fan composite muffler Download PDFInfo
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- CN207879717U CN207879717U CN201721769824.0U CN201721769824U CN207879717U CN 207879717 U CN207879717 U CN 207879717U CN 201721769824 U CN201721769824 U CN 201721769824U CN 207879717 U CN207879717 U CN 207879717U
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- inserted sheet
- noise elimination
- metope
- elimination inserted
- low frequency
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Abstract
The utility model discloses a kind of metope exhaust fan composite muffler, including bend muffler, low frequency strip-type silencer, installation heavy frame, protection network, bend muffler are 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 unit weight super glass wool plate, the weather-proof film of overcoating 0.02mm thickness, protection slab is the perforated metal panel that aperture 6mm punching rates are 25%, the thickness of noise elimination inserted sheet is 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 raising 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 technology
Exhaust fan drives fan blade to rotate certain driving air-flow by motor, a kind of air conditioning electricity for making indoor and outdoor air exchange
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.
Wind turbine strikes opposing stationary air by blade shape and inclination angle to form air flowing.The air force of wind turbine
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 rotating speed and the piece number of machine blade are related, and the noise of air outlet is more than about 5~10 dB of air inlet noise（A）.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 head is generally 100Pa~200Pa or so, it is more sensitive to the air loss that silencer is arranged.Institute
With the crushing using existing exhaust duct silencer is larger, and discharge capacity will be caused impacted.
Invention content
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, protection network, 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 rates are
20% perforated metal panel, the top setting of noise elimination inserted sheet is arc-shaped, and the thickness of noise elimination inserted sheet is 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 unit weight is selected, when low-frequency component ratio is higher, choosing
The super glass wool plate for being 110kg/m3 with unit weight, when low-frequency component ratio is relatively low, it is the ultra-fine glass of 60kg/m3 to select unit weight
Glass cotton plate.The unit weight of super glass wool in anechoic sheet is improved in the case where keeping noise elimination inserted sheet thickness can improve low cut
Amount.The unit weight that super glass wool is improved in the case where reducing noise elimination inserted sheet thickness, can keep 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 silencing channel effective area of low frequency strip-type silencer and the sectional area of silencer is more than 60%, eliminates the noise logical
Road effective area is more than exhaust fan outlet air open area 60%.Silencing channel wind speed is effectively reduced, the silencer pressure loss is reduced, goes out
Wind wind speed is low, effectively reduces outlet air dynamic pressure.
Reach best " 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 mounted on inner side of elbow and two sides, sound absorption structure
By the extra-fine glass-wool felt of unit weight 48kg/m3, it is cladded with the weather-proof film of 0.02mm thickness, protection slab is that aperture 6mm punching rates are 20%
Perforated metal panel.
Using the weather-proof film of 0.02mm thickness, compared to the absorption that overcoating glass cloth can improve Middle and low frequency noise, 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 more than metope exhaust outlet diameter, the width of air inlet
More 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.
Heavy frame is installed and is mounted on metope, protection network is mounted on low frequency strip-type silencer bottom, low frequency strip-type silencer bottom
It is fastened using bolt between portion and installation heavy frame plane.
Metope exhaust fan composite muffler forms series specification, the T35-11 systems produced with Guangdong Zhaoqing Deton Co., Ltd.
For row low-noise axial flow fan：It is corresponded to according to exhaust fan series specification, meets wind turbine model by 2.8A~11.2A, air quantity
By 826~68000 m3/h, total head is by 39~480Pa, and wind turbine outer diameter is by 0.33~1.21m.
The beneficial effects of the invention are as follows：
1, it can effectively cut down exhaust fan and go out wind noise more than 20dB（A）, silencer attenuation characteristic and wind turbine go out wind noise
Frequency spectrum 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, mounting process is easy.
Description of the drawings
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 implementation mode
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, protection network 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 unit weight 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%, disappearance inserted sheet top setting arc-shaped 24, the thickness of noise elimination inserted sheet 22 is 50~70mm, is disappeared
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 26 effective area of silencing channel of low frequency strip-type silencer 2 and the sectional area of silencer is more than 60%, eliminates the noise
26 effective area of channel is more 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 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 unit weight 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 the height of air inlet 12 is more than exhaust outlet 42 directly
Diameter, the width of air inlet 12 are more 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 protection network is mounted on 2 bottom of low frequency strip-type silencer, low frequency
It is fastened using bolt 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
All any modification, equivalent and improvement etc., should be included in protection scope of the present invention made by within bright spirit and principle
Within.
Claims (6)
1. a kind of metope exhaust fan composite muffler, including bend muffler, low frequency strip-type silencer, installation heavy frame, protection network,
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 includes plate flange straight tube, noise elimination inserted sheet altogether, noise elimination inserted sheet by 60~110kg/m3 of unit weight super glass wool plate, outside
The weather-proof film of 0.02mm thickness is covered, protection slab is the perforated metal panel that aperture 6mm punching rates are 20%, and the thickness of noise elimination inserted sheet is
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 more than 60%, and silencing channel effective area is more 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 sound absorption structure mounted on inner side of elbow and two sides, sound absorption structure by unit weight 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 rates are 20%.
4. metope exhaust fan composite muffler according to claim 1, it is characterized in that：The air inlet of bend muffler is rectangular
The height of shape, air inlet is more than metope exhaust outlet diameter, and the width of air inlet is more 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：Heavy frame is installed and is mounted on metope,
Protection network is mounted on low frequency strip-type silencer bottom, and bolt is used between low frequency strip-type silencer bottom and installation heavy frame plane
Fastening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721769824.0U CN207879717U (en) | 2017-12-18 | 2017-12-18 | Metope exhaust fan composite muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721769824.0U CN207879717U (en) | 2017-12-18 | 2017-12-18 | Metope exhaust fan composite muffler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207879717U true CN207879717U (en) | 2018-09-18 |
Family
ID=63502812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721769824.0U Active CN207879717U (en) | 2017-12-18 | 2017-12-18 | Metope exhaust fan composite muffler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207879717U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931297A (en) * | 2017-12-18 | 2019-06-25 | 厦门嘉达环保科技有限公司 | Metope exhaust fan composite muffler |
-
2017
- 2017-12-18 CN CN201721769824.0U patent/CN207879717U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931297A (en) * | 2017-12-18 | 2019-06-25 | 厦门嘉达环保科技有限公司 | Metope exhaust fan composite muffler |
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