CN102364002A - Passive interference type ventilation sound insulation window - Google Patents

Abstract

The invention discloses a design method for a passive interference type ventilation sound insulation window. The window mainly comprises a Z-shaped ventilation pipeline and a U-shaped ventilation pipeline. Acoustic-path difference for propagation of noise in the two ventilation pipelines is an odd number times half wavelength of main noise; the two ventilation pipelines are converged in front of an air inlet in a building, and noise propagating in the pipelines is cancelled through interference at a convergence part, so that the aim of reducing low-frequency noise is fulfilled; and three working states, namely, a free ventilation state, a ventilation and noise reduction state and a strong noise reduction state, are preset for the window.

Description

A kind of passive interfere type ventilated and soundproof window

One, technical field

The present invention relates to a kind of passive interfere type The Dsign of Ventilation and Sound Insulation Window method.

Two, background technology

" IAQ standard " (GB/T 18883-2002) the regulation dwelling house and the indoor resh air requirement standard of office building of China's issue in 2002 are everyone 30m ³/ h.Be energy conservation; The life of realization low-carbon (LC) need open the window and carry out ventilation, yet meetings such as traffic noise and domestic noise is along with in the window inlet chamber of opening; Therefore develop a kind of can natural ventilation, can effectively reduce the window that gets into room noise again and have great importance.

For the natural ventilation sound proof window, correlative study has both at home and abroad obtained certain progress.Scholar [Kang J., Brocklesby M.W., Feasibility of applying micro-perforated absorbers in acoustic window systems, Applied Acoustics.66, pp.669-689,2005; Yu realizes week, Wang Zuomin, a kind of design of new and effective natural ventilation sound proof window and experiment; Environmental Engineering, 26, pp.96-99; 2008.] the inside and outside opening of double window is misplaced with isolated direct sound, reduce the noise in the inlet chamber at the transparent micropunch film of the inner placement of window.Utilize the outer opening of window, window inside and the gas channel of window inner opening formation and indoor and outdoor draught head, can realize indoor and outdoor air-flow exchange.When outdoor wind speed was 1.5～2.5m/s, ventilated and soundproof window air outlet mean wind speed was 0.7m/s, and ventilation is 28m ³/ h.Sound reduction index when ventilated and soundproof window is opened is 28dB.What this was misplaced the use of type natural ventilation sound proof window is passive sound absorption reduction, and its low frequency noise reduction is limited.Scholar [Nishimura Y.; Nishimura S.; Nishimura T., Yano T.Sound propagation in soundproofing casement windows.Applied Acoustics.70, pp.1160-1167; 2009.] optimized the air intake of casement formula natural ventilation sound proof window and the position of air outlet, realized certain noise reduction in medium-high frequency.Scholar [Huang H., Qiu X., Kang J.; Active noise attenuation in ventilation windows; Journal of the Acoustical Society of America, 130, pp.1-13; 2011] utilization Active noise control using technology has improved the low frequency sound insulation property that is misplaced type natural ventilation sound proof window.

CN101220726 discloses a kind of ventilated and soundproof window, comprises the inside and outside two-layer window frame that is installed in the window opening, and the cavity between the double-deck window frame is separated into a plurality of cavitys and imports into natural ventilation while attenuate acoustic noise; CN1482341 discloses a kind of full impregnated light ventilation noise elimination window, comprising: layer glass, microperforated panel, noise elimination air channel, ventilation blower fan, air inlet port, gas outlet are that the force ventilated noise elimination air channel attenuate acoustic noise of using simultaneously of employing machine power is imported into; The ventilated and soundproof window design of describing in the disclosed patent such as CN101220726 and CN1482341 all is when ventilating, and uses the mode of sound absorption to reduce noise, and its low frequency noise reduction capability is limited.CN101881119A disclose a kind of can effective attenuation in natural ventilation the noise active noise reduction sliding sash structure that imports into of broad band low frequency noise especially; And realize this system at actual soundproof room; This vent window adopts the active guidance system of coupling; The system architecture relative complex, strict to the control system hardware structure, on further expanding, there is certain limitation simultaneously; CN101852056A discloses a kind of active ventilated and soundproof window notion, only provides the basic principle of some Active noise control using, does not provide concrete technology and realizes approach.Described the active sound proof window of natural ventilation in the disclosed patent such as CN101881119A and CN101852056A,, realized that cost is higher, be difficult to accepted by common resident family though window low frequency sound insulation property is improved.

Utilize the sound wave interference effect of cancelling out each other, the present invention relates to a kind of passive interfere type The Dsign of Ventilation and Sound Insulation Window, be characterized in that construction cost is low, simplicity of design.

Three, summary of the invention

1. goal of the invention: the purpose of this invention is to provide a kind of passive interfere type The Dsign of Ventilation and Sound Insulation Window method, to improve its low frequency anti-acoustic capability.

2. technical scheme: as attach shown in Fig. 1 and 2, for reaching the foregoing invention purpose, passive interfere type ventilation noise reduction window of the present invention comprises that mainly the ventilating duct, one of a Z type fall ventilating duct and the ordinary window 4a and the 4b of ".Wherein the air intake vent 1 of Z type and the ventilating duct of falling the " and 2 area are equal; Each limit yardstick in Z type and the ventilating duct of falling " cross section should not surpass 1/2 of main noise wavelength; The acoustic propagation path length difference of sound wave in Z type and the ventilating duct of falling the " is the odd of main noise 1/2 wavelength; The Z type converges before Z type ventilating duct inner opening 3 with the ventilating duct of falling the "; Lower wall surface is laid sound absorption material 8 on Z type ventilating duct, makes the noise of in Z type and the ventilating duct of falling the ", propagating close in the concourse amplitude.Extraneous fresh air can satisfy the room ventilation demand through these two ventilating ducts by in air intake 3 inlet chambers.

Principle of the present invention is: the present invention utilizes the interior sound wave of Z type and the ventilating duct of falling the " in inlet chamber, to carry out interfere type before and offsets, to reduce room noise.

The invention has the beneficial effects as follows: ventilated and soundproof window of the present invention has than the better noise reduction of tradition ventilation sound proof window (only comprising Z type ventilating duct) at low frequency.Ventilated and soundproof window construction cost of the present invention is far below the realization cost of active ventilated and soundproof window.

Four, description of drawings

Fig. 1 is the 3-D solid structure figure of passive interfere type ventilated and soundproof window.

Fig. 2 is the elevation of passive interfere type ventilated and soundproof window.

Fig. 3 is the A-A generalized section of Fig. 2.

Fig. 4 is all kinds of sound isolation of windows discharge curves of Numerical Simulation Analysis gained.

Five, the specific embodiment

Through instance the present invention is elaborated below.

As shown in Figure 1, the inlet of Z type and the ventilating duct of falling the " is respectively 1 and 2, and each inlet all has corresponding indoor and outdoors window, is respectively 1a, 1b, 2a and 2b.Towards indoor air intake is 3, and corresponding indoor and outdoors window is 3a and 3b.As shown in Figure 2,4a is the ordinary window between Z type and the ventilating duct of falling the ".4b is the ordinary window that is positioned at room ventilation mouth bottom.4a and 4b are the ordinary double-layer glass window.For making composition clear, window 4a and 4b do not draw among Fig. 1.The Z type converges at 5 places with the ventilating duct of falling the ".6 is external noise and the propagation path of air-flow in Z type ventilating duct.7 is external noise and the propagation path of air-flow in the ventilating duct of falling the ".8 for going up the sound absorption material that lower wall surface is laid in the Z type ventilating duct, in following instance, is the thick common rock wool of 3cm.

This window is preset three kinds of duties: freely ventilate, ventilation noise reduction and strong noise reduction state.Freely ventilating is meant that window 1a, 1b, 2a, 2b, 3a, 3b, 4a and 4b open, and realizes the duty of freely ventilating to greatest extent.The ventilation noise reduction is meant opens window 1a, 2a and 3b, and window 1b, 2b, 3a, 4a and 4b close, and realize limited ventilation, reduce the duty of room noise simultaneously.Strong noise reduction is meant that window 1a, 1b, 2a, 2b, 3a, 3b, 4a and 4b close, and realizes the duty of noise reduction to greatest extent.

Next will be given under the ventilation noise reduction state all-bottom sound attenuation that increases by introducing the ventilating duct of falling the ".With length L ₁To L ₇Be respectively 0.2m, 0.8m, 0.2m, 0.4m, 0.4m, 0.4m and 0.2m, all ventilating duct internal diameter thickness are that 0.2m is an example.The propagation distance 6 of noise in Z type ventilating duct can be approximately

${\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="HSA00000566284800011.png"\; state="\{\{state\}\}">d</figure-callout>}}_1=\frac{{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HSA00000566284800011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1}{2}+L_2-\frac{{\mathrm{<figure-callout\; id="7"\; label="L"\; filenames="HSA00000566284800021.png"\; state="\{\{state\}\}">L</figure-callout>}}_7}{2},---\left(1\right)$

The propagation distance 7 of noise in the ventilating duct of falling the " can be approximately

${\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HSA00000566284800011.png,HSA00000566284800021.png"\; state="\{\{state\}\}">d</figure-callout>}}_2=\frac{{\mathrm{<figure-callout\; id="5"\; label="L"\; filenames="HSA00000566284800011.png,HSA00000566284800031.png"\; state="\{\{state\}\}">L</figure-callout>}}_5}{2}+\frac{{\mathrm{<figure-callout\; id="6"\; label="L"\; filenames="HSA00000566284800021.png"\; state="\{\{state\}\}">L</figure-callout>}}_6}{2}+{\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="HSA00000566284800011.png"\; state="\{\{state\}\}">d</figure-callout>}}_1+\frac{{\mathrm{<figure-callout\; id="6"\; label="L"\; filenames="HSA00000566284800021.png"\; state="\{\{state\}\}">L</figure-callout>}}_6}{2}+{\mathrm{<figure-callout\; id="5"\; label="L"\; filenames="HSA00000566284800011.png,HSA00000566284800031.png"\; state="\{\{state\}\}">L</figure-callout>}}_5,---\left(2\right)$

Therefore, the path difference of noise in Z type and the ventilating duct of falling the " does

$d=d_2-{\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="HSA00000566284800011.png"\; state="\{\{state\}\}">d</figure-callout>}}_1=\frac{{\mathrm{<figure-callout\; id="5"\; label="L"\; filenames="HSA00000566284800011.png,HSA00000566284800031.png"\; state="\{\{state\}\}">L</figure-callout>}}_5}{2}+\frac{{\mathrm{<figure-callout\; id="6"\; label="L"\; filenames="HSA00000566284800021.png"\; state="\{\{state\}\}">L</figure-callout>}}_6}{2}+\frac{{\mathrm{<figure-callout\; id="6"\; label="L"\; filenames="HSA00000566284800021.png"\; state="\{\{state\}\}">L</figure-callout>}}_6}{2}+{\mathrm{<figure-callout\; id="5"\; label="L"\; filenames="HSA00000566284800011.png,HSA00000566284800031.png"\; state="\{\{state\}\}">L</figure-callout>}}_5={\mathrm{<figure-callout\; id="6"\; label="L"\; filenames="HSA00000566284800021.png"\; state="\{\{state\}\}">L</figure-callout>}}_6+\frac{{3\mathrm{<figure-callout\; id="5"\; label="L"\; filenames="HSA00000566284800011.png,HSA00000566284800031.png"\; state="\{\{state\}\}">L</figure-callout>}}_5}{2},---\left(3\right)$

It is 1m that calculating can get this path difference.When this sound field difference is 1/2 wavelength, can get by f=c/ λ (c is the velocity of sound, is taken as 344m/s, and λ is a wavelength), main noise reduction frequency should be 172Hz.

The double-layer glass window is that the poly (methyl methacrylate) plate of 1cm is formed by thickness, is spaced apart 0.2m, and its sound insulation factor curve can be calculated and got [David A. by the engineering experience formula; Colin H.; Engineering noise control, London and New York:Spon Press, 2003].Z type ventilating duct and Z type can get through the Finite Element Numerical Simulation analysis with the sound insulation factor of the ventilating duct of falling " combination.The sound insulation factor of common ventilated and soundproof window is the combination sound insulation factor of double-layer glass window and Z type ventilating duct.The sound insulation factor of interfere type ventilated and soundproof window is the combination sound insulation factor of double-layer glass window and Z type and the ventilating duct of falling the ".

Wherein, the design formulas of combination sound insulation factor does

$\mathrm{TL}={10\log }_{10}\left(\frac{\underset{i}{\mathrm{\&Sigma;}}{S}_i}{\underset{i}{\mathrm{\&Sigma;}}{S}_i\&times;{10}^{-R_i/10}}\right),---\left(4\right)$

S in the formula _iBe i area of members, R _iIt is the sound insulation factor of i member.

Fig. 4 has provided 100 to 1000Hz, and the double-layer glass window is closed fully, the third-octave sound insulation factor curve of common noise reduction window (only comprising Z type ventilating duct) and the said interfere type noise reduction of this patent window.Can see that centre frequency is that the newly-increased noise reduction of the third-octave frequency range of 200Hz is maximum, has small deviation with above-mentioned 172Hz owing to introduced the ventilating duct of falling the ", this is because above-mentioned path difference is an approximation, is not exact value.Can see in addition, in other third-octave frequency ranges, also have certain newly-increased noise reduction.The low frequency sound insulation property of this this passive interfere type ventilated and soundproof window of explanation is superior to having only the common ventilated and soundproof window of Z type ventilating duct.

Claims (5)

1. passive interfere type ventilated and soundproof window: form by a Z type ventilating duct, a ventilating duct of falling the " and some ordinary window.

2. Z type ventilating duct as claimed in claim 1 is characterized in that: the opening towards outside is an air intake vent, is the interior of building air intake towards the inner opening of outside; When inside and outside opening staggers, just formed one and can stop that noise directly gets into the Z type ventilating duct of interior of building; Lower wall surface is laid sound absorption material to reduce acoustic pressure on pipeline.

3. like the claim 1 described ventilating duct of falling the ", it is characterized in that: pipe shape " several " word for standing upside down, the adjacent and area of the air intake vent of its outside air intake vent and Z type ventilating duct equates; It and Z type ventilating duct converged before Z type pipeline inner opening.

4. like power 1 described some ordinary window, it is characterized in that: be distributed between Z type, the pipeline of falling the " and the building masonry wall, be generally the double-layer glass sound proof window.

5. like right 1 described passive interfere type ventilated and soundproof window, it is characterized in that: preset three kinds of duties: free ventilation state, promptly all windows are all opened; Ventilation noise reduction state is promptly opened the part window, makes the interior noise of propagating of Z type and the ventilating duct of falling the " interfere counteracting at concourse; Strong noise reduction state, promptly all windows are all closed.

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