CN103383138A - Sound absorbing wedge muffler - Google Patents

Abstract

The invention provides a sound absorbing wedge muffler which comprises a muffler box body and a muffler vent pipe, wherein the muffler vent pipe is positioned in the muffler box body, the air inlet end and the air outlet end of the muffler box body extend out of the muffler box body, absorbing wedges are symmetrically arranged on the inner pipe wall of the muffler vent pipe, and the wedges of the symmetrically arranged absorbing wedges are arranged in a staggered manner. According to the sound absorbing wedge muffler provided by the invention, air flow rate is greatly slowed down on the basis of not increasing the size and length of equal effect muffler; as the sound absorbing wedge is triangular shaped, the sharp corner part of the triangular mounted on the muffler faces the air inlet direction, air resistance of the wedge is small and can not be increased, and extra pressure beyond the unit is not needed accordingly. The sound absorbing wedge muffler is a novel muffler which is good in noise attenuation effect and belongs to biological clean engineering, and the novel muffler increases the attenuation effect thereof.

Description

A kind of sound-absorbing wedging type muffler

Technical field

The present invention relates to the acoustic processing technical field, relate in particular to a kind of sound-absorbing wedging type muffler.

Background technology

The muffler of bio clean room of the prior art is double-deck micro-pore plate type muffler, and because not allowed the noise reduction filler in microwell plate, erasure effect is poor.As lengthen muffler and can increase resistance again, increase the outer overbottom pressure of machine of unit, from and can increase noise.In the bio clean room engineering, the noise reduction aspect is a larger difficult problem always.Mostly a lot of bio clean room engineerings, the particularly construction party of hospital's cleaning project are to adopt the way that does not meet the biologic cleanliness engine request to fill the noise reduction article in microwell plate and reach the noise reduction requirement.

Summary of the invention

The object of the invention is to design a kind of novel sound-absorbing wedging type muffler, address the above problem.

To achieve these goals, the technical solution used in the present invention is as follows:

A kind of sound-absorbing wedging type muffler, comprise muffler casing and muffler ventilation duct, air intake and described muffler ventilation duct outlet air end that described muffler ventilation duct is positioned at described muffler casing and described muffler ventilation duct stretch out described muffler casing, be arranged with the sound-absorbing wedge on the inner tubal wall of described muffler ventilation duct, the splitter of the described sound-absorbing wedge that is oppositely arranged shifts to install.

Described sound-absorbing wedge is isosceles acute triangle, and its drift angle forms described splitter, and its sharp edge is positioned on the windward side of described backwind tube.

Described sound-absorbing wedge is made by the corrosion resistant plate of thin plate micropore and/or the aluminium alloy plate of thin plate micropore.

Also comprise the airduct reverse interface, the air intake of described muffler ventilation duct is communicated to airduct by described airduct reverse interface.

The muffler of bio clean room of the prior art, during airduct air flow direction muffler because former microwell plate size is consistent with airduct, the air-flow great majority directly flow to air opening end from microwell plate air inlet end, and only some air-flow flaggy outside the microwell plate micropore flows to muffler microwell plate and muffler slows down flow velocity.

And adopt sound-absorbing wedging type muffler of the present invention, because each sound-absorbing wedge is arranged on the muffler outside plate, in whole muffler, the space is greater than the airduct caliber, air-flow whole space when entering muffler is open expansion, add each sound-absorbing wedging type arranged in dislocation air-flow and a wind will be arranged by each sound-absorbing wedge, a part detours between each sound-absorbing wedge, has greatly slowed down the flow velocity of air-flow.The sound-absorbing wedge is all again leg-of-mutton, leg-of-mutton wedge angle is partly to install towards the air inlet direction, and is little to the resistance of air-flow, can not increase too large resistance, thereby also not increasing necessity of the outer overbottom pressure of unit, is a kind of muffler of novel biologic cleanliness engineering of excellent noise reduction effect.

Beneficial effect of the present invention can be summarized as follows:

1, the present invention on the basis that does not increase equal effect muffler size, length, with a plurality of sound-absorbing wedge arranged in dislocation in muffler.Because each sound-absorbing wedge is arranged on the muffler outside plate, in whole muffler, the space is greater than the airduct caliber, air-flow whole space when entering muffler is open expansion, add each sound-absorbing wedging type arranged in dislocation air-flow and a wind will be arranged by each sound-absorbing wedge, a part detours between each sound-absorbing wedge, has greatly slowed down the flow velocity of air-flow.The sound-absorbing wedge is all again leg-of-mutton, leg-of-mutton wedge angle is partly to install towards the air inlet direction, and is little to the resistance of air-flow, can not increase too large resistance, thereby also not increasing necessity of the outer overbottom pressure of unit, is a kind of muffler of novel biologic cleanliness engineering of excellent noise reduction effect.

2, the present invention adopts the principle of sound-absorbing wedging type noise reduction best results in various noise reduction modes, is that double-deck micro-pore plate type muffler changes the erasure effect that many sound-absorbings of micro-pore plate type wedge Heterogeneous Permutation combined muffler increases muffler into the muffler in the clean engineering of protozoa.

3, sound-absorbing wedge of the present invention adopts trigone to make, and the sound-absorbing wedge adopts the corrosion resistant plate of thin plate micropore and aluminium alloy plate to make; Can adopt during installation to misplace up and down to dress or left and right dislocation to the dress formula, also can adopt to misplace up and down to the dress formula, when each group sound-absorbing wedge is installed and rear one group of dislocation, the leg-of-mutton sharp edge of sound-absorbing wedge is positioned at the windward side.

Description of drawings

Fig. 1 is used for the structural representation of the muffler (plate muffler) of bio clean room in prior art.

Fig. 2 is the structural representation of sound-absorbing wedge set-up mode in the present invention.

Fig. 3 is the curve comparison diagram of plate muffler and sound-absorbing wedging type muffler structure.

The specific embodiment

In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.

A kind of silencing means return air inlet system with the sound-absorbing wedge as shown in Fig. 2 (and with reference to figure 1), comprise muffler casing 1 and muffler ventilation duct 2, air intake and described muffler ventilation duct 2 outlet air ends that described muffler ventilation duct 2 is positioned at described muffler casing 1 and described muffler ventilation duct 2 stretch out described muffler casing 1, be arranged with sound-absorbing wedge 4 on the inner tubal wall of described muffler ventilation duct 2, the splitter of the described sound-absorbing wedge 4 that is oppositely arranged shifts to install; Described sound-absorbing wedge 4 is isosceles acute triangle, and its drift angle forms described splitter, and its sharp edge is positioned on the windward side of described backwind tube; Described sound-absorbing wedge 4 is made by the corrosion resistant plate of thin plate micropore and/or the aluminium alloy plate of thin plate micropore.In a preferred embodiment, described silencing means return air inlet system with sound-absorbing wedge 4 also comprises airduct reverse interface 3, and the air intake of described muffler ventilation duct 2 is communicated to airduct by described airduct reverse interface 3.In a preferred embodiment, the double-level-metal microwell plate 5 shown in Fig. 1 no longer is set.

The sound-absorbing structure of sound-absorbing wedge 4 effective density and the effective pressure contracting modulus density that depends on sound-absorbing material and acoustic medium and certain weighted mean value of modulus on a certain cross section.The inverse of the inverse of effective density ρ and effective modulus of compressibility K can carry out arithmetic average by the area weighted.Be located at a section sound bearing medium and the shared area percentage of sound-absorbing material is respectively no and n1, get final product:

$\frac{1}{P}=\frac{n_o}{p_o}+\frac{n_1}{p_1};$ $\frac{1}{k}=\frac{n_o}{k_o}+\frac{n_1}{k_1}$

ρ in formula _o, K _oWith ρ ₁, K ₁Represent respectively the effective density and effective modulus of compressibility of sound bearing medium and material, and K=PC ², C is the Acoustic Wave Propagation effective sound velocity in the wedge sound-absorbing structure, it and effective density ρ are similar, relevant with the position of structure sheaf.N+n in formula _o=1 with upper two formulas in can obtain

$\sqrt{\frac{1}{\mathrm{pk}}}=\frac{n_o}{p_o{c}_o}{\{1+\left(\frac{n_1}{n_o}\right)[\frac{\frac{p_1}{p_o}(1+\frac{{c_1}^2}{{c_o}^2})+\frac{n_1}{n_o}}{({p_1}^2{c_1}^2/{p_o}^2{c_o}^2)}\left]\right\}}^{1/2}$

Can be got by following formula

$\sqrt{\frac{1}{\mathrm{pk}}}=\frac{1}{\mathrm{pc}}=\frac{1}{p_o{c}_o},$ When x=0, n _o=1, n ₁=0;

When x=1, n _o=0, n ₁=1;

As from the foregoing, sound-absorbing wedge 4 structures are from the characteristic impedance ρ of X=0 _oC _oProgressively be transitioned into the ρ at X=1 place ₁C ₁, the sound wave of incident can be by the progressively transition of its characteristic impedance, and the highly effective material that enters, sound wave can obtain effectively to wrap up in and subtract.

During the noise that the clean operating room wind speed forms is mainly, the low-frequency sound wave scope, and being far superior to flat structure, the erasure effect of sound-absorbing wedge 4 has good sound absorption qualities at high-frequency range, and in the relatively poor mode of low-frequency range sound-absorbing effect, the sound-absorbing effect of sound-absorbing wedge 4 in each frequency of sound wave all than more excellent and stable.

Be illustrated in figure 3 as plate muffler and sound-absorbing wedging type muffler curve comparison figure.

More than by the detailed description of concrete and preferred embodiment the present invention; but those skilled in the art should be understood that; the present invention is not limited to the above embodiment; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement etc., within protection scope of the present invention all should be included in.

Claims (4)

1. sound-absorbing wedging type muffler, it is characterized in that: comprise muffler casing and muffler ventilation duct, air intake and described muffler ventilation duct outlet air end that described muffler ventilation duct is positioned at described muffler casing and described muffler ventilation duct stretch out described muffler casing, be arranged with the sound-absorbing wedge on the inner tubal wall of described muffler ventilation duct, the splitter of the described sound-absorbing wedge that is oppositely arranged shifts to install.

2. sound-absorbing wedging type muffler according to claim 1, it is characterized in that: described sound-absorbing wedge is isosceles acute triangle, and its drift angle forms described splitter, and its sharp edge is positioned on the windward side of described backwind tube.

3. sound-absorbing wedging type muffler according to claim 1, it is characterized in that: described sound-absorbing wedge is made by the corrosion resistant plate of thin plate micropore and/or the aluminium alloy plate of thin plate micropore.

4. sound-absorbing wedging type muffler according to claim 1, it is characterized in that: also comprise the airduct reverse interface, the air intake of described muffler ventilation duct is communicated to airduct by described airduct reverse interface.

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