CN106545190A - Quiet room air outlet silencing system - Google Patents
Quiet room air outlet silencing system Download PDFInfo
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- CN106545190A CN106545190A CN201510610699.8A CN201510610699A CN106545190A CN 106545190 A CN106545190 A CN 106545190A CN 201510610699 A CN201510610699 A CN 201510610699A CN 106545190 A CN106545190 A CN 106545190A
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- quiet room
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Abstract
The invention discloses a kind of quiet room air outlet silencing system, including centrifugal blower, impedance muffler, silencing channel, perforated acoustic board composition, described impedance muffler is that the high density noise elimination inserted sheet that 10mm spacing is 15～25mm is constituted by suppressor case, centrifugal blower interface installation portion, mounting flange, interior sound-absorbing material and thickness, and impedance muffler is arranged on quiet room top side；Silencing channel is arranged on inside quiet room, is made up of sound insulationg board and perforated acoustic board, and sound insulationg board sets low-density sound-absorbing material with air outlet silencing passage of the side roof part Formation cross-section product as right angled triangle in quiet room with quiet room facade into 40 ° of angles in sound insulationg board.With small volume, low manufacture cost, easy for installation；Sound deadening capacity is big, reaches full range, the purpose of high sound deadening capacity；The sound deadening capacity of quiet room air outlet silencing system can be suitable with the oise insulation factor of dead room.
Description
Technical field
The present invention relates to a kind of noise control technique, more particularly to a kind of quiet room air outlet silencing system.
Background technology
Quiet room（Acoustic detection room）Be a kind of sound insulation measurement device for the product manufacturing design of workshop for having test request, carry out sound absorption process in quiet room so as to become one it is small-sized without sound chamber, can inside test some small-sized products, such as motor, sound equipment, transformator etc..
As operator need to carry out dependence test in quiet room, the testing staff worked in quiet room should ensure that their working condition.According to《Design of Industrial Enterprises sanitary standard》The fresh air of the 6.6.1 working spaces of the basic hygienic requirements in the 6th chapter working spaces of GBZ 1-2010 should be from outdoor, and fresh wind port should be arranged on air cleaner area, and resh air requirement should meet following requirements：Non- air-conditioning working space accounts for the workshop of volume ＜ 20m per capita, should ensure that the amount of fresh air per person >=30m/h；As shared by during volume ＞ 20m, the amount of fresh air per person >=20m/h is should ensure that；Using the workshop of air adjustment, the amount of fresh air per person >=30m/h is should ensure that, the amount of fresh air per person of toilet answers >=40m/h.For this purpose, the ventilation system that quiet room is equipped with should meet the requirement of the amount of fresh air per person.In order to ensure the working condition of testing staff, ventilation system and mechanical exhaust blower fan should be set, thus quiet room air inlet/outlet acoustic filter is set into the standard configuration in quiet room.
As quiet room specification is little, operator are typically with regard to 1～2 for detection, and ventiduct roadbed is little, and conventional arrangement of muffler volume is big, and setup cost is high, it is difficult to meet the actual demand in small silent room.Meanwhile, as long as ventilation system arranges exhaust fan and can just meet ventilation needs, so the air outlet silencing device for being provided with exhaust fan is particularly important.
The content of the invention
It is an object of the invention to provide the quiet room air outlet silencing system supporting with small silent room of a kind of inexpensive, low ventiduct roadbed, high sound deadening capacity.
For achieving the above object, technical solution of the invention is：A kind of quiet room air outlet silencing system, including centrifugal blower, impedance muffler, silencing channel, perforated acoustic board composition, described impedance muffler is that the high density noise elimination inserted sheet that 10mm spacing is 15～25mm is constituted by suppressor case, centrifugal blower interface installation portion, mounting flange, interior sound-absorbing material and thickness, and impedance muffler is arranged on quiet room top side；Silencing channel is arranged on inside quiet room, is made up of sound insulationg board and perforated acoustic board, and sound insulationg board sets low-density acoustic board with quiet room facade into 40 ° of angles in sound insulationg board, with the air outlet silencing passage that a side roof part Formation cross-section in quiet room is right angled triangle.Described impedance muffler bottom is arranged in quiet room preformed hole, is coupled with quiet roof portion by mounting flange, and elastic vibration isolation pad is arranged between mounting flange and quiet roof portion, filling sealing sound insulation glue between impedance muffler and quiet room preformed hole；Acoustic pad is laid at other positions outside suppressor case, can improve the oise insulation factor of acoustic filter, prevents low-frequency noise from entering inside acoustic filter from muffler shell.Described centrifugal blower interface is coupled by rubber flange plate with air inlet of centrifugal fan in the side on impedance muffler top.
Described high density noise elimination inserted sheet is the sound absorbing plate of polyester fibre acoustic panel or hardening, two chamfers, high density noise elimination inserted sheet facade and centrifugal blower interface angle in 90 °.Space is left with quiet room in described two side of sound insulationg board, and acoustic board is installed on the outside of sound insulationg board, and the perforated acoustic board for being in parallel arranged to form slit-aperture type perforate is arranged in two side of acoustic board.Two chamfer of sound absorbing plate of polyester fibre acoustic panel or hardening, reduces the pressure loss, contributes to the improvement of aerodynamic quality.Described centrifugal blower is arranged on quiet room top by amortisseur, and centrifugal blower interface is arranged on acoustic filter interface installation portion, centrifugal blower system static pressure >=250Pa, air quantity≤400m/h, noise≤45dB（A）Low-noise centrifugal fan.Effective gas channel in the perforation field of described perforated acoustic board >=resistance noise reduction portion.Centrifugal blower is arranged on quiet room top by cushion, in order to prevent the solid transmission of centrifugal blower vibration.
The sound deadening capacity of strip-type silencer is closely related with the spacing of sound absorption inserted sheet, piece number, piece thickness.It is that 15～25mm can obtain larger sound deadening capacity in the effective length of very little that sound absorption inserted sheet is arranged to thickness for 10mm spacing.Sound deadening capacity calculating is done to the chip noise elimination portion of quiet room air outlet silencing system：
First, basic design parameters
Chip noise elimination portion specification is：203mm width × 300mm height × 250mm length, acoustic filter sectional area is：0.0609m,
Noise elimination inserted sheet 6, every specification is：9mm thickness × 300mm width × 250mm length,
Two side walls arrange deadener：Per side mark lattice it is：9mm thickness × 300mm width × 250mm length,
Gas channel：Width is 20mm × 7=140mm, and gas channel is：140mm × 300mm=0.042m, available ventilation area 69%；
Air quantity：400.00m³/h=0.11m³/s（Wind speed：2.62m/s）；
2nd, chip resistance noise reduction portion sound deadening capacity is calculated
Computing formula：∆L =（nƒ α0 ·P·L0）/S（dB）
In formula：The attenuation of L --- dissipative muffler（dB）；
N --- the constant term of the extinction coefficient K value different with frequency, K=n α 0, n values according to audio frequency 125,250,500,1000,2000Hz, respectively n=1.20,1.35,1.50,1.65,1.80；
α 0 --- the material acoustic absorptivity measured with standing wave tube；With reference to unit weight 220kg/m, thickness 9mm sound Te Er polyester fibre acoustic panel data 125Hz（0.09）、250Hz（0.35）、500Hz（0.74）、1000 Hz（0.96）、2000Hz（0.75）、4000Hz（0.94）；Gas channel is equal to rear cavity；
Effective length 0.25m of L0 --- acoustic filter；
P --- noise damping channel section girth 0.6m（The another two sides wall of acoustic filter is not provided with deadener）；
S --- noise damping channel cross-sectional area 0.006m；
The noise elimination attenuation of passage between 2.2 sound absorption inserted sheets
125Hz ∆L =（nƒ α0 ·P·L0）/S=1.20×0.09×0.6×0.25÷0.006=2.70dB
250Hz ∆L =（nƒ α0 ·P·L0）/S=1.35×0.35×0.6×0.25÷0.006=11.81dB
500Hz ∆L =（nƒ α0 ·P·L0）/S=1.50×0.74×0.6×0.25÷0.006=27.75dB
1000Hz ∆L =（nƒ α0 ·P·L0）/S=1.65×0.96×0.6×0.25÷0.006=39.60dB
2000Hz ∆L =（nƒ α0 ·P·L0）/S=1.80×0.75×0.6×0.25÷0.006=33.75dB
4000Hz ∆L =（nƒ α0 ·P·L0）/S=1.80×0.94×0.6×0.25÷0.006=42.30dB .
Quiet room air outlet silencing system forms MULTIPLE COMPOSITE noise elimination structure, overcomes impact of the noise of quiet room ventilation system and environment to background noise value in quiet room.The right angle reactive muffling structure of the noise of ventilation system and environment → acoustic filter interface（Low-frequency noise is absorbed effectively）→ chip resistance noise reduction portion（High-frequency noise is absorbed effectively）→ silencing channel（Sound absorption, steady air flow, reduction reproduced air-flow noise）→ perforated acoustic board（Sound absorption, shunting, reduction air-flow velocity）In → quiet room（Reach full range, the purpose of high sound deadening capacity）.
The invention has the beneficial effects as follows；It is small volume, low manufacture cost, easy for installation；Sound deadening capacity is big, reaches full range, the purpose of high sound deadening capacity；The sound deadening capacity of quiet room air outlet silencing system can be suitable with the oise insulation factor of dead room.Can continue, normally carry out detection work, overcome the impact of background noise value in the noise cancellation sound chamber of quiet room air outlet silencing system in quiet room air outlet silencing system boot.
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is the side view of quiet room air outlet silencing system of the invention.
Fig. 2 is the front view of Fig. 1.
Fig. 3 is the top view of Fig. 1.
Fig. 4 is the partial enlarged drawing of Fig. 1.
1. centrifugal blower in figure, 2. silencing channel, 3. perforated acoustic board, 4. housing, 5. centrifugal blower interface, 6. mounting flange, 7. sound-absorbing material, 8. noise elimination inserted sheet, 9. sound insulationg board, 10. low-density acoustic board, 11. preformed holes, 12. elastic vibration isolation pads, 13. sealing sound insulation glue, 14. acoustic pads, 15. rubber flange plates, 16. chamferings, 17. slit-aperture type perforates, 18. amortisseurs.
Specific embodiment
As shown in Figure 1, 2, 3, a kind of quiet room air outlet silencing system, including centrifugal blower（1）, impedance muffler, silencing channel（2）, perforated acoustic board（3）Composition, described impedance muffler is by suppressor case（4）, centrifugal blower interface（5）Installation portion, mounting flange（6）, interior sound-absorbing material（7）And thickness is the high density noise elimination inserted sheet that 10mm spacing is 15～25mm（8）Composition, impedance muffler are arranged on quiet room top side；Silencing channel（2）It is arranged on inside quiet room, by sound insulationg board（9）And perforated acoustic board（3）Composition, sound insulationg board（9）With quiet room facade into 40 ° of angles, sound insulationg board（9）Low-density acoustic board is set inside（10）With air outlet silencing passage of the side roof part Formation cross-section product for right angled triangle in quiet room（2）.Described impedance muffler bottom is arranged on quiet room preformed hole（11）In, by mounting flange（6）It is coupled with quiet roof portion, mounting flange（6）Elastic vibration isolation pad is set between quiet roof portion（12）, impedance muffler and quiet room preformed hole（11）Between filling sealing sound insulation glue（13）；Lay acoustic pad in other positions outside suppressor case（14）.Described centrifugal blower interface（5）In the side on impedance muffler top, pass through rubber flange plate with air inlet of centrifugal fan（15）It is coupled.
Described high density noise elimination inserted sheet（8）For polyester fibre acoustic panel or the sound absorbing plate of hardening, two chamfers（16）, high density noise elimination inserted sheet（8）Facade and centrifugal blower interface angle in 90 °.Described sound insulationg board（9）Space, sound insulationg board are left with quiet room in two sides（9）Acoustic board is installed in outside, is arranged in two side of acoustic board and is in parallel arranged to form slit-aperture type perforate（17）Perforated acoustic board（3）Part is in sound insulationg board（9）Outside the space that two sides are left with quiet room.Described centrifugal blower（1）By amortisseur（18）Installed in quiet room top, centrifugal blower interface（5）On acoustic filter interface installation portion, centrifugal blower（1）It is static pressure >=250Pa, air quantity≤400m/h, noise≤45dB（A）Low-noise centrifugal fan.Described perforated acoustic board（3）Perforation field >=resistance noise reduction portion effective gas channel.
It should be appreciated that without departing from the scope of the present invention, multiple combination and change can be made to above-described embodiment.All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of quiet room air outlet silencing system, including centrifugal blower, impedance muffler, silencing channel, perforated acoustic board composition, it is characterised in that：Described impedance muffler is that the high density noise elimination inserted sheet that 10mm spacing is 15～25mm is constituted by suppressor case, centrifugal blower interface installation portion, mounting flange, interior sound-absorbing material and thickness, and impedance muffler is arranged on quiet room top side；Silencing channel is arranged on inside quiet room, is made up of sound insulationg board and perforated acoustic board, and sound insulationg board sets low-density acoustic board with quiet room facade into 40 ° of angles in sound insulationg board, with air outlet silencing passage of the side roof part Formation cross-section product for right angled triangle in quiet room.
2. quiet room air outlet silencing system according to claim 1, is characterized in that：Described impedance muffler bottom is arranged in quiet room preformed hole, is coupled with quiet roof portion by mounting flange, and elastic vibration isolation pad is arranged between mounting flange and quiet roof portion, filling sealing sound insulation glue between impedance muffler and quiet room preformed hole；Lay acoustic pad in other positions outside suppressor case.
3. quiet room air outlet silencing system according to claim 1, is characterized in that：Described centrifugal blower interface is coupled by rubber flange plate with air inlet of centrifugal fan in the side on impedance muffler top.
4. quiet room air outlet silencing system according to claim 1, is characterized in that：Described high density noise elimination inserted sheet is the sound absorbing plate of polyester fibre acoustic panel or hardening, two chamfers, high density noise elimination inserted sheet facade and centrifugal blower interface angle in 90 °.
5. quiet room air outlet silencing system according to claim 1, is characterized in that：Space is left with quiet room in described two side of sound insulationg board, and acoustic board is installed on the outside of sound insulationg board, and the perforated acoustic board part that setting is in parallel arranged to form slit-aperture type perforate in two side of acoustic board is outside the space that two side of sound insulationg board is left with quiet room.
6. quiet room air outlet silencing system according to claim 1, is characterized in that：Described centrifugal blower is arranged on quiet room top by amortisseur, and centrifugal blower interface is arranged on acoustic filter interface installation portion, centrifugal blower system static pressure >=250Pa, air quantity≤400m/h, noise≤45dB（A）Low-noise centrifugal fan.
7. quiet room air outlet silencing system according to claim 1, is characterized in that：Effective gas channel in the perforation field of described perforated acoustic board >=resistance noise reduction portion.
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| CN201510610699.8A CN106545190B (en) | 2015-09-23 | 2015-09-23 | Silent room air outlet silencing system |
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| CN201510610699.8A CN106545190B (en) | 2015-09-23 | 2015-09-23 | Silent room air outlet silencing system |
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| CN106545190B CN106545190B (en) | 2019-02-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931581A (en) * | 2017-04-12 | 2017-07-07 | 江苏菲特滤料有限公司 | A kind of non-maintaining ventilation noise reducing apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931581A (en) * | 2017-04-12 | 2017-07-07 | 江苏菲特滤料有限公司 | A kind of non-maintaining ventilation noise reducing apparatus |
| CN106931581B (en) * | 2017-04-12 | 2022-04-12 | 江苏菲特滤料有限公司 | Maintenance-free ventilation noise reduction equipment |
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| CN106545190B (en) | 2019-02-12 |
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