CN202532679U - Sound-absorbing wedge type silencer - Google Patents

Abstract

The utility model discloses a sound-absorbing wedge type silencer. The sound-absorbing wedge type silencer comprises a silencer box and a silencer ventilation pipe, wherein the silencer ventilation pipe is positioned in the silencer box; an air inlet end and an air outlet end of the silencer ventilation pipe stretch out of the silencer box; sound-absorbing wedges are symmetrically arranged on an inner pipe wall of the silencer ventilation pipe; and wedge tips of the sound-absorbing wedges which are oppositely arranged are arranged in a staggered mode. On the basis of not increasing the dimension and the length of the silencer with the same effect, the flow rate of gas flow is greatly reduced; all the sound-absorbing wedges are triangular, sharp angle parts of the triangles are opposite to the direction of an air inlet and have low resistance to the gas flow, and too high resistance cannot be increased, so that excess pressure outside a unit is not required to be increased; and the silencer is good in noise reducing effect and novel and belongs to the field of biological cleaning, and the silencing effect of the silencer is improved.

Description

A kind of sound-absorbing wedging type muffler

Technical field

The utility model relates to the acoustic processing technical field, relates 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 of not allowing the noise reduction filler in the microwell plate, erasure effect is poor.As the muffler that extends can increase resistance again, increases 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 bigger 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 in microwell plate, to fill the noise reduction article and reach the noise reduction requirement.

The utility model content

The purpose of the utility model is to design a kind of novel sound-absorbing wedging type muffler, addresses the above problem.

To achieve these goals, the technical scheme of the utility model employing is following:

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

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

Said 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 said muffler ventilation duct is communicated to airduct through said airduct reverse interface.

The muffler of bio clean room of the prior art; Consistent with airduct during airduct air flow direction muffler owing to former microwell plate size; 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 the sound-absorbing wedging type muffler of employing the utility model; Because of each sound-absorbing wedge is installed on the muffler outside plate; The space is greater than the airduct caliber in the whole muffler, and air-flow whole space when getting into muffler is open expansion, and adding each sound-absorbing wedging type arranged in dislocation air-flow will have a wind through each sound-absorbing wedge; A part detours between each sound-absorbing wedge, has slowed down the flow velocity of air-flow greatly.The sound-absorbing wedge all is again leg-of-mutton; Leg-of-mutton wedge angle partly is to install towards the air inlet direction, and is little to the resistance of air-flow, can not increase too big 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.

The beneficial effect of the utility model can be summed up as follows:

1, the utility model 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 of each sound-absorbing wedge is installed on the muffler outside plate; The space is greater than the airduct caliber in the whole muffler; Air-flow whole space when getting into muffler is open expansion; Adding each sound-absorbing wedging type arranged in dislocation air-flow will have a wind through each sound-absorbing wedge, and a part detours between each sound-absorbing wedge, has slowed down the flow velocity of air-flow greatly.The sound-absorbing wedge all is again leg-of-mutton; Leg-of-mutton wedge angle partly is to install towards the air inlet direction, and is little to the resistance of air-flow, can not increase too big 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 utility model 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 dislocation permutation and combination type muffler increases muffler into the muffler in the clean engineering of protozoa.

3, the sound-absorbing wedge of the utility model 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 misplace up and down to dress or about dislocation to the dress formula, also can adopt to misplace up and down to the dress formula, with the one group of dislocation in back, the leg-of-mutton sharp edge of sound-absorbing wedge was positioned at the windward side when each group sound-absorbing wedge was installed.

Description of drawings

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

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

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

The specific embodiment

Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

A kind of silencing means return air inlet system that has the sound-absorbing wedge shown in Fig. 2 (and with reference to figure 1); Comprise muffler casing 1 and muffler ventilation duct 2; Air intake and said muffler ventilation duct 2 outlet air ends that said muffler ventilation duct 2 is positioned at said muffler casing 1 and said muffler ventilation duct 2 stretch out said muffler casing 1; Be arranged with sound-absorbing wedge 4 on the inner tubal wall of said muffler ventilation duct 2, the splitter of the said sound-absorbing wedge 4 that is oppositely arranged shifts to install; Said sound-absorbing wedge 4 is an isosceles acute triangle, and its drift angle forms said splitter, and its sharp edge is positioned on the windward side of said backwind tube; Said 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, the said silencing means return air inlet system that has sound-absorbing wedge 4 also comprises airduct reverse interface 3, and the air intake of said muffler ventilation duct 2 is communicated to airduct through said airduct reverse interface 3.In a preferred embodiment, the double-level-metal microwell plate 5 shown in Fig. 1 no longer is set.

Effective density and the effective pressure of the sound-absorbing structure of sound-absorbing wedge 4 on a certain cross section modulus that contracts depends on certain weighted mean value of sound-absorbing material and acoustic density of medium and modulus.The inverse of effective density ρ can carry out arithmetic average by the area weighted with the inverse of effective modulus of compressibility K.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:

$\frac{1}{P}=\frac{n_o}{p_o}+\frac{n_1}{{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA00001602596800011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1};$ $\frac{1}{k}=\frac{n_o}{k_o}+\frac{n_1}{{\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA00001602596800011.png"\; state="\{\{state\}\}">k</figure-callout>}}_1}$

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

$\sqrt{\frac{1}{\mathrm{pk}}}=\frac{n_o}{p_o{c}_o}{\{1+\left(\frac{n_1}{n_o}\right)[\frac{\frac{p_1}{p_o}(1+\frac{{{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA00001602596800011.png"\; state="\{\{state\}\}">c</figure-callout>}}_1}^2}{{c_o}^2})+\frac{n_1}{n_o}}{({{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA00001602596800011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1}^2{{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA00001602596800011.png"\; state="\{\{state\}\}">c</figure-callout>}}_1}^2/{p_o}^2{c_o}^2)}\left]\right\}}^{1/2}$

Can get 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;

$\frac{1}{p_1{c}_1},$ When x=1, n _o=0, n ₁=1;

By on can know that sound-absorbing wedge 4 structures are from the characteristic impedance ρ of X=0 _oC _oProgressively carry out the transition to the ρ at X=1 place ₁C ₁, the sound wave of incident can be through the progressively transition of its characteristic impedance, and highly effective entering material, 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 diagram.

More than through the detailed description of concrete and preferred embodiment the utility model; But those skilled in the art should be understood that; The utility model is not limited to the above embodiment; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement etc., all should be included within the protection domain of the utility model.

Claims (4)

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

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

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

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