CN2094620U - Wide frequency sheet type sound damper - Google Patents
Wide frequency sheet type sound damper Download PDFInfo
- Publication number
- CN2094620U CN2094620U CN 91200562 CN91200562U CN2094620U CN 2094620 U CN2094620 U CN 2094620U CN 91200562 CN91200562 CN 91200562 CN 91200562 U CN91200562 U CN 91200562U CN 2094620 U CN2094620 U CN 2094620U
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- sound absorption
- absorption plate
- plate
- resistive
- silencing apparatus
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Abstract
AThe utility model relates to a wide frequency sheet type silencer, which solves the problem of the lower silencing amount of the existing silencer, characterized in that the vertical plane and the top antiplane of both sides of an airflow channel are respectively provided with resistive sound-absorbing flaps which comprise surface layers and inner layers. The silencer has the advantages of small wind resistance, large silencing amount, cleaning surface, etc., being suitable for the technical field of ventilated air condition.
Description
The utility model relates to a kind of broad-band strip-type silencer that is used for air conditioner ventilation system stream control noise of air.
Existing chip and tubular type underwater sound device, bend muffler, impedance complex formula silencing apparatus and tiny hole noise silencer all are widely used in air conditioner ventilation system stream.If by single silencing apparatus gage length be 1 meter average sound deadening capacity size of each frequency band of weighing them, the sound deadening capacity maximum of GB impedance complex formula silencing apparatus reaches 20(db so) about.Many engineers and technicians are often the preferred unit of GB impedance complex formula silencing apparatus as the elimination noise of air.GB impedance complex formula silencing apparatus mainly is made up of four parts: 1) shell steel plate; 2) expansion chamber; 3) resistive sound absorption plate; 4) inlets and putlets of ventilation.The thick 50mm of resistive sound absorption plate sheet, a pitch of fins 90～120mm, be mainly used in and absorb high intermediate frequency noise, expansion chamber is used to absorb low frequency noise, because the sheet thickness of the GB impedance complex formula sound device of this structure, a pitch of fins is bigger, the sectional area of the sectional area of expansion chamber and effective air passageways smaller, the low-frequency range sound deadening capacity is little, has only 8～15(db), can not satisfy requirement of engineering.For this reason, people usually use the series connection of GB impedance complex formula silencing apparatus, to increase its low frequency sound deadening capacity.In addition, the surface of the resistive sound absorption plate of resistance complex muffler has 40% to be positioned at horizontal plane approximately, and horizontal surface is subjected to the influence that the sedimentation of bacterium dirt particulate is polluted easily than vertical and antiplane surface.And the surface of resistive sound absorption plate is the glass fiber cloth of one deck porous, becomes storage, breeding spot and the diffuse source of adsorbent particles easily.
The purpose of this utility model is that a kind of broad-band strip-type silencer will be provided, its boundary dimension is not more than the GB impedance complex formula silencing apparatus with air quantity, but the average sound deadening capacity of each frequency band, especially low frequency sound deadening capacity, be significantly improved than GB impedance complex formula silencing apparatus, and do not have internal surface bacterium dust pollution.
The purpose of this utility model is achieved in that the sheet of resistive sound absorption plate is thick by changing the surface structure of resistive sound absorption plate, and a pitch of fins and assembly direction improve the average sound deadening capacity of each frequency band of strip-type silencer and avoid internal surface to pollute.It is existing that details are as follows:
The big chief of a tribe teaches the strip-type silencer sound deadening capacity empirical correlation of giving in " noise control " book of showing by horse:
ΔL＝φ（α
0） (P)/(S) L （1）
The sound deadening capacity Δ L of strip-type silencer is inversely proportional to effective channel cross-sectional area S as can be known, with the surface area PL and the acoustic absorptivity α of effective passage
0Be directly proportional.
By this principle, for increasing sound deadening capacity, the utility model reduces to 50～80mm to the pitch of fins of resistive sound absorption plate (clear distance of sheet and sheet) by 90 common～120mm, and effectively the surface area PL of passage also significantly increases thereupon.
Acoustic absorptivity α
0Relevant with the thickness of sound-absorbing material, in general, the thickness that increases sound absorption plate can increase acoustic absorptivity, improves the medium and low frequency acoustically effective.The GB impedance sound-absorbing material of full formula silencing apparatus effect again is the super glass wool of 18 kilograms of unit weights, the thick 50mm of sheet, the multiple one deck glass cloth in sound absorption plate surface.The utility model increases to 100～200mm to the thickness of sound absorption plate (sheet is thick).The surface structure of sound absorption plate is influential to the Low Medium Frequency acoustically effective, through screening, the present invention has selected for use has the surface layer of the plastic pellicle of better acoustically effective as sound absorption plate to medium and low frequency, the surface of the topped sound absorption plate at the glass cloth facing of plastic pellicle, and the thickness of plastic pellicle is 10～100um.
By the experiment as can be known, take the thickening and the blooming measure after, acoustic absorptivity is significantly improved, wherein the low frequency absorption coefficient ratio had originally had the variation of " matter ".
For keeping the sound absorption plate surface cleaning, gain in strength, reduce flow resistance, the utility model adds at resistive sound absorption plate plastic pellicle surface layer and has answered the smooth corrosion protection metal perforated plate of one deck, as armour layer.It is generally acknowledged that punching rate is greater than 20% armour layer, and is little to the sound absorbing capabilities influence.The punching rate that the present invention adopts is not less than 30%, thereby can not influence acoustically effective.
The utility model sound absorption plate two ends, promptly air intake and outlet air end are provided with the metal water guiding strip, and smooth garden curved metal water guiding strip and orifice plate can reduce the flow resistance about 50%, and the bending radius of garden arc water guiding strip is 50～100mm.
According to general knowledge and barodynamics principle as can be known: compare with the dust fall of the horizontal surface fungi pollution that falls, vertical and antiplane surface is difficult for contaminated.
The utility model is assemblied in the vertical surface of silencing apparatus air-flow path both sides and the antiplane direction at top to resistive sound absorption plate.
Since the outer surface of sound absorption plate topped smooth plastic pellicle and corrosion protection metal perforated plate, resistive sound absorption plate is assemblied in vertical surface and antiplane, the flow velocity of air is generally greater than 5 meter per seconds in addition, can think, in actual motion, the possibility that airborne bacterium dirt particulate is trapped in the sound absorption plate surface is minimum.Because pollution has appearred in smooth surface exactly, also cleaning and sterilization easily.Compare GB impedance complex formula silencing apparatus, in fact the sound absorption plate of glass cloth facing can't clean.
Broad-band strip-type silencer of the present utility model, its resistive sound absorption plate are primary elements, can be by requirement of engineering with the different boundary dimension combination in any of different pitch of fins, to satisfy different sound deadening capacities and different air quantity requirements.It can " standard film " formation dispatch from the factory, assemble fast at the scene, thereby help industrialized production, transportation and installation, and can reduce investment outlay.
The surface structure and the assembly direction of the resistive sound absorption plate that the utility model adopts also are applicable to the resistive and reactive muffler that improves other pattern.
In sum, the utlity model has following advantage:
1, sound deadening capacity obviously increases;
2, the low frequency sound deadening capacity is big;
3, windage is little, and nominal air delivery can increase;
4, internal surface cleaning, pollution-free and nothing corrosion;
5, can clean and sterilize;
6, be convenient to industrialized production and installation;
7, can be with primary element sound absorption plate combination in any one by one, applicability is strong;
8, boundary dimension does not increase.
Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof.
Fig. 1 and Fig. 2 are that Fig. 3 is the A-A sectional arrangement drawing according to the outline drawing of the broad-band strip-type silencer that the utility model proposes, and Fig. 4 is the B-B drawing in side sectional elevation, and Fig. 5 is the big detail drawing of C-C part section.
Describe the details and the working condition of the concrete device that the utility model proposes in detail below in conjunction with accompanying drawing.
This device comprises shell steel plate (1), garden arc water guiding strip (3), vertically arranged resistive sound absorption plate (2) and be positioned at resistive sound absorption plate (6) and several parts such as turnover wind adpting flange (5), (5 ') on the antiplane of air-flow path (4) top.
By the big detail drawing of Fig. 5 C-C part section as seen, resistive sound absorption plate (2), (6) are made up of surface layer and internal layer.Surface layer divides three layers: corrosion protection metal perforated plate (9); Plastic pellicle (10); Glass cloth (11).Internal layer be super glass wool or other acoustic absorptivity quite or be higher than the sound-absorbing material (12) of super glass wool.The outside of super glass wool sound-absorbing material (12) all encases with glass cloth (11) and plastic pellicle (10), is seated in then in the zinc-plated Lightgage Steel Joist frame (8), and zinc-plated Lightgage Steel Joist frame (8) is connected with rivet with corrosion protection metal perforated plate (9).Resistive sound absorption plate (2), (6) are fixed on the shell steel plate (1) with zinc-plated Lightgage Steel Joist frame (8), rivet (7).Air passes through silencing apparatus along direction shown in figure (3) arrow, airborne sound wave imports on the resistive sound absorption plate (2) that is arranged on air-flow path (4) both sides and the top office antiplane, (6), sound wave causes sound absorption plate (2), (6) interior air and fiber vibration, under frictional force and viscous force effect, part acoustic energy is converted into thermal energy consumption and falls.By Fig. 3 and Fig. 4 as seen, broad-band strip-type silencer of the present utility model does not have horizontal sound absorption plate, and under the effect of gravity and air-flow power, bacterium dirt particulate is difficult to be trapped in the resistive sound absorption plate (2) that is positioned at vertical and antiplane, on the surface of (6).The end face of air-flow path (4) is resistive sound absorption plate (6), and the bottom surface is smooth metal surface, shell steel plate (1) bottom surface just, and when airspeed during greater than 5 meter per seconds, the thrust of air-flow has stoped particulate sedimentation on the bottom plane of air-flow path (4).Under working condition, broad-band strip-type silencer of the present utility model has kept the internal surface cleaning automatically.
Resistive sound absorption plate shown in the drawings (2), the sheet of (6) is thick to be 100～200mm, a pitch of fins 50～80mm, during actual selecting for use, can be by above-mentioned sheet thick and pitch of fins dimensional range, and design air flow and sound deadening capacity are specifically determined a sheet pitch of fins and combining form.
Garden arc water guiding strip (3) is positioned at inlets and putlets of ventilation (5), and (5 ') are located, and makes of sheet metal, and bending radius is thick half of sheet, i.e. 50～100mm, and garden arc water guiding strip (3) is fixed on the zinc-plated Lightgage Steel Joist frame (8) with aluminum rivet.
Zinc-plated Lightgage Steel Joist frame (8) by zinc-plated Lightgage Steel Joist through welding or the framework formed of riveted joint, it is resistive sound absorption plate (2), (6) skeleton, for guaranteeing rigidity, the spacing of the Lightgage Steel Joist of zinc-plated Lightgage Steel Joist frame (8) is not more than 500mm, the cross-sectional width of Lightgage Steel Joist and sound absorption plate (2), the sheet of (6) is thick identical.Zinc-plated Lightgage Steel Joist need not specially be processed, and it is a kind of structural material that the multiple standards scale is arranged commonly used.
Claims (6)
1, a kind of broad-band strip-type silencer comprises shell steel plate (1), garden arc water guiding strip (3), and vertically arranged resistive sound absorption plate (2) is positioned at resistive sound absorption plate (6) and turnover wind adpting flange (5) on the antiplane of air-flow path (4) top, (5 '); It is characterized in that: resistive sound absorption plate (2), (6) are assemblied in the vertical surface and the top antiplane of silencing apparatus air-flow path (4) both sides; Vertical sound absorption plate (2) and antiplane sound absorption plate (6) comprise surface layer and internal layer, and surface layer divides (11) three layers of corrosion protection metal perforated plate (9), plastic pellicle (10) and glass fiber cloths, and internal layer is super glass wool sound-absorbing material (12); Resistive sound absorption plate (2), (6) with zinc-plated Lightgage Steel Joist frame (8), rivet (7) is fixed on the shell steel plate (1), corrosion protection metal perforated plate (9) is connected with zinc-plated Lightgage Steel Joist frame with rivet with garden arc water guiding strip (3), resistive sound absorption plate (2), (6) super glass wool sound-absorbing material (12) outside on all encases with glass fiber cloth (11) and plastic pellicle (10), is seated in then in the zinc-plated Lightgage Steel Joist frame (8).
2, silencing apparatus according to claim 1, the punching rate that it is characterized in that corrosion protection metal perforated plate (9) is for being equal to or greater than 30%.
3, silencing apparatus according to claim 1, the thickness that it is characterized in that plastic pellicle (10) is 10～100um.
4, silencing apparatus according to claim 1 is characterized in that resistive sound absorption plate (2), and the sheet of (6) is thick to be 100～200mm.
5, silencing apparatus according to claim 1, a pitch of fins that it is characterized in that resistive sound absorption plate (2) is 50～80mm.
6, silencing apparatus according to claim 1 is characterized in that garden arc water guiding strip (3) is assemblied in turnover wind two ends of resistive sound absorption plate (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91200562 CN2094620U (en) | 1991-01-16 | 1991-01-16 | Wide frequency sheet type sound damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91200562 CN2094620U (en) | 1991-01-16 | 1991-01-16 | Wide frequency sheet type sound damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2094620U true CN2094620U (en) | 1992-01-29 |
Family
ID=4911493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91200562 Withdrawn CN2094620U (en) | 1991-01-16 | 1991-01-16 | Wide frequency sheet type sound damper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2094620U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011500A (en) * | 2010-12-20 | 2011-04-13 | 无锡杰尔压缩机有限公司 | Wall surface sound absorption structure of high-speed centrifugal fan testing room |
-
1991
- 1991-01-16 CN CN 91200562 patent/CN2094620U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011500A (en) * | 2010-12-20 | 2011-04-13 | 无锡杰尔压缩机有限公司 | Wall surface sound absorption structure of high-speed centrifugal fan testing room |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |