CN2062891U - High efficient silencer with multiple chambers - Google Patents
High efficient silencer with multiple chambers Download PDFInfo
- Publication number
- CN2062891U CN2062891U CN 90203145 CN90203145U CN2062891U CN 2062891 U CN2062891 U CN 2062891U CN 90203145 CN90203145 CN 90203145 CN 90203145 U CN90203145 U CN 90203145U CN 2062891 U CN2062891 U CN 2062891U
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- expansion chambers
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- low frequency
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to a high efficient silencer with multiple chambers, comprising more than two expansion chambers connected in series. The utility model is suitable for controlling air power noise of middle-low frequency generated from blowers and compressors. Because of the unequal length of the expansion chambers, the different frequency noise is targeted to be eliminated. The expansion chambers which are added with double layer of micro perforated plates has favorable sound deadening effect on high, middle and low frequency noise. The utility model which has the advantages of reasonable design, simple structure, strong practicability, and no damage is especially suitable for high powder dust, high-temperature and wet adverse working environment of metallurgy, chemical industry, and mine industry.
Description
The utility model belongs to the noise elimination device in a kind of environmental protection technical field, is specially adapted to control during fan blower, air compressor machine equipment produce, the low frequency air power noise.
The noise that fan blower, air compressor machine equipment send when operation about 100 decibels, mainly is the air power noise that the turbulence of air inlet air-flow is produced generally, and frequency range is at 31.5～500HZ, in, low-frequency noise, based on low frequency, ultra-low frequency noise.It has directly polluted environment, has a strong impact on people's physical and mental health, demands urgently administering.At present, the sound suppressor kind that is used to control air power noise is a lot, wherein dissipative muffler is applicable to height, mid-frequency noise, reactive muffler is applicable to low-frequency noise, and in administering, low-frequency noise generally adopts impedance complex formula sound suppressor, as F type or the K type fan blower of selling on the market, air compressor machine impedance complex formula is eliminated the noise serial, its structure is continuous sound absorber of superfine glass and lost resistance section, owing to adopt resistive material, cause sound suppressor manufacturing process inclement condition, be subjected to dust when putting into operation simultaneously, effects limit such as humidity, serviceable life is not long, the more important thing is that it is inoperative to the ultra-low frequency noise, thereby do not reach and give the phase effect.
For solving the above-mentioned deficiency of prior art, the utility model has designed a kind of efficient multicell reactive muffler, adopt more piece expansion chambers series connection form, targetedly control in, the low frequency air power noise, make simply thereby reach, be not subjected to dust, humidity and temperatures involved, but the noise elimination effect is obvious and the purpose of long-time running.
The efficient multicell reactive muffler that the utility model provides is composed in series by the above expansion chambers of two joints, considers that the sound suppressor profile is unsuitable long, preferably adopts four Room cascaded structures.The spectrum analysis of sending noise from fan blower, air compressor machine equipment, all have than a high sound pressure and peak value is arranged from 31.5～500HZ in a certain frequency range, for the frequency of noise elimination that makes each expansion chambers staggers mutually, avoid appearing near the phenomenon of not eliminating the noise some frequency, should make and save respectively that expansion chambers is uneven in length and the inner connecting tube of expansion chambers inserts with 1/2 and 1/4 respectively.In view of design philosophy of the present utility model is: the equal in length that is positioned at first, second joint expansion chambers of wind direction front portion, to control low frequency, ultra-low frequency noise and to scabble outstanding peak value, the length that is positioned at the afterbody expansion chambers that connects with the equipment air intake opening at wind direction rear portion is half of sound suppressor length, based on control remaining in, low-frequency noise and air-flow regenerated noise, inner connecting tube inserts with one heart with 1/2 and 1/4 long ratio of chamber respectively.Therefore, when the sound suppressor divergence ratio of selecting for use when the utility model was 16～20, each saved the concrete length of expansion chambers and will use general sound suppressor design specifications to determine according to the concrete condition of noise source.For reducing the noise elimination drag losses, insert the inner connecting tube usage aperture 8mm of expansion chambers, the perforated pipe of percentage of perforation 23% connects.
If the double-deck microperforated panel that the lining dress is made by sheet metal on the expansion chambers inwall of sound suppressor can increase control effect high, mid-frequency noise, then the utility model is applicable to the noise abatement of all air-driven machine equipment.When the expansion chambers inwall installs double-deck microperforated panel additional, its percentage of perforation is: 1 layer, 2～2.5%, 2 layers, 1～1.5% aperture are 1mm, expansion chambers inwall and nexine microperforated panel distance are 150mm, the cavity depth of microperforated panel is 100mm, and adopt interruption strong point mode to fix, to increase microperforated panel intensity.
Embodiment of the present utility model (one) is installed in Ye Shi 9NO blower inlet place, sound suppressor is that four joint expansion chambers serial connections form, long 2600mm, diameter is 1780mm, joint inserts a mouthful φ 420mm headed by the inner connecting tube diameter, periproct is inserted outlet φ 385mm, inner connecting tube aperture 8mm, the perforated pipe of percentage of perforation 23% connects, divergence ratio is 20, being positioned at first, second joint expansion chambers equal in length of wind direction front portion, respectively is 1/4 of sound suppressor length, the low frequency of major control 31.5～63HZ, ultra-low frequency noise and scabble the outstanding peak value of other frequency noise.The 3rd joint expansion chambers length is slightly larger than the first segment expansion chambers, major control in remaining, low-frequency noise, and the 4th joint expansion chambers length only is half of the 3rd joint, to handle mid-frequency noise and air-flow regenerated noise.Find out in 250HZ noise elimination value and reach 23dB that frequency is from the average 14.4dB that reduces between 31.5～K from table (), the A sound level reduces 21dB, and loudness reduces by 76.80%.
Second embodiment of the present utility model is installed in 40m
3The air compressor machine air inlet of/min, sound suppressor are that four joint expansion chambers serial connections form long 2100mm, diameter 1900mm, divergence ratio is 18, and joint inserts a mouthful φ 450mm headed by the inner connecting tube diameter, and periproct is inserted outlet 410mm, inner connecting tube inserts with 1/2 and 1/4 respectively, and acoustic wave filter structure is identical with embodiment one.Finding out that from table (two) this sound source belongs to the low frequency intense noise, is 27dB in 31.5HZ noise elimination value, and frequency on average reduces 19.2dB from 31.5～500HZ.
Accompanying drawing 1 is adorned the structural representation of the efficient multicell reactive muffler of double-deck microperforated panel for wall liner in the expansion chambers.
Accompanying drawing 2 is that the A of accompanying drawing 1 is to view.
Number in the figure is: (1), microperforated panel; (2), inner connecting tube; (3), expansion chambers central dividing plate; (4), expansion chambers cavity; (5), perforation is taken over.
Its noise-cancelling theory of brief description in conjunction with the accompanying drawings now:
The expansion chamber sound suppressor is to utilize the expansion of pipeline transversal section and contraction to cause acoustic reflection and interfere and eliminate the noise.When the noise that includes multiple frequency content enters sound suppressor, because the sudden expansion and the sudden contraction of pipeline transversal section, and the predetermined length of expansion chambers, factors such as the insertion length of inner connecting tube, make the sound wave that transmits along pipeline produce reflection, interfere mutually, produce phasic difference, the acoustic wave energy of incident is weakened gradually.Enter the sound wave of some frequency in the noise of first segment, the second joint expansion chambers and can only in the chamber, come back reflective and can not pass through, remaining in, low-frequency noise also will be controlled in the third and fourth joint expansion chambers, thereby play the effect of noise elimination noise abatement.
The utility model compared with prior art, have reasonable in design, simple in structure, acoustic attenuation performance is good, practical, the characteristics such as not fragile, especially be suitable under the abominable working environment of high dust, humidity, high temperature of metallurgy, chemical industry, mine industry to use.
Table one:
| Sound level (dB) | Octave sound pressure level (dB) | |||||||||
| A | C | 31.5HZ | 63HZ | 125HZ | 250HZ | 500HZ | KHZ | 2KHZ | 4KHZ | |
| Before the noise elimination | 105 | 117 | 109 | 114 | 110 | 108 | 103.5 | 95 | 84 | 73 |
| After the noise elimination | 84 | 100 | 106 | 95 | 88 | 85 | 84 | 85 | 72 | 64 |
| Insertion loss | 2 | 17 | 3 | 14 | 22 | 23 | 19.5 | 10 | 12 | 9 |
Claims (4)
1, a kind ofly be used for controlling, the efficient multicell reactive muffler of low frequency air power noise, adopted expansion chambers reactive muffling structure, it is characterized in that being composed in series by the above expansion chambers of two joints, wherein with control low frequency, ultra-low frequency noise with scabble outstanding peak value, be positioned at first, second joint expansion chambers equal in length of wind direction front portion, with control in remaining, low-frequency noise and air-flow regenerated noise, the length that is positioned at the afterbody expansion chambers at wind direction rear portion is half of sound suppressor length, and inner connecting tube inserts with one heart with 1/2 and 1/4 long ratio of chamber respectively.
2, according to the said sound suppressor of claim 1, it is characterized in that being composed in series by four joint expansion chambers, wherein the length of the 4th joint expansion chambers is half of the 3rd joint expansion chambers length.
3,, it is characterized in that the inner connecting tube that inserts is connected by the perforated pipe of percentage of perforation 23% according to the said sound suppressor of claim 2.
4, according to claim 1---3 said sound suppressors is characterized in that lining is equipped with the double-deck microperforated panel that sheet metal is made on the inwall of expansion chambers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90203145 CN2062891U (en) | 1990-03-17 | 1990-03-17 | High efficient silencer with multiple chambers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90203145 CN2062891U (en) | 1990-03-17 | 1990-03-17 | High efficient silencer with multiple chambers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2062891U true CN2062891U (en) | 1990-09-26 |
Family
ID=4884399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90203145 Withdrawn CN2062891U (en) | 1990-03-17 | 1990-03-17 | High efficient silencer with multiple chambers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2062891U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10352210B2 (en) | 2014-09-09 | 2019-07-16 | 3M Innovative Properties Company | Acoustic device |
| CN111503874A (en) * | 2020-04-26 | 2020-08-07 | 青岛海尔空调电子有限公司 | Silencer and fresh air system with same |
| CN114215669A (en) * | 2021-12-24 | 2022-03-22 | 安徽江淮汽车集团股份有限公司 | Method for eliminating air inlet broadband noise and expansion cavity structure |
-
1990
- 1990-03-17 CN CN 90203145 patent/CN2062891U/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10352210B2 (en) | 2014-09-09 | 2019-07-16 | 3M Innovative Properties Company | Acoustic device |
| CN111503874A (en) * | 2020-04-26 | 2020-08-07 | 青岛海尔空调电子有限公司 | Silencer and fresh air system with same |
| CN111503874B (en) * | 2020-04-26 | 2023-03-28 | 青岛海尔空调电子有限公司 | Silencer and fresh air system with same |
| CN114215669A (en) * | 2021-12-24 | 2022-03-22 | 安徽江淮汽车集团股份有限公司 | Method for eliminating air inlet broadband noise and expansion cavity structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |