CN203321631U

CN203321631U - Reactive muffler structure with perforated pipes combined with narrow-gap resistant cavity

Info

Publication number: CN203321631U
Application number: CN201320403478XU
Authority: CN
Inventors: 周以齐; 白儒; 王丽; 薛源
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2013-07-08
Filing date: 2013-07-08
Publication date: 2013-12-04
Anticipated expiration: 2023-07-08

Abstract

The utility model discloses a reactive muffler structure with perforated pipes combined with a narrow-gap resistant cavity. The reactive muffler structure comprises a barrel body, the air inflow perforated pipe and the transverse flow perforated pipe, wherein the barrel body is divided into a left cavity and a right cavity by a longitudinal partition plate II, the left cavity is further divided into an upper cavity and a lower cavity by a transverse partition plate, and the upper cavity and the lower cavity are communicated. The lower cavity is divided by a longitudinal partition plate I; the air inflow perforated pipe penetrates through the lower cavity and the longitudinal partition plate I, and the transverse flow perforated pipe penetrates through the upper cavity to reach the interior of the right cavity; the top of the right cavity is communicated with an air outflow pipe. The reactive muffler structure is simple and reasonable in structure, the soundproofing characteristics of the perforated pipes and the narrow-gap resistant cavity are comprehensively utilized, pressure loss is small, soundproofing amount is large, and the reactive muffler structure is particularly good in soundproofing effect in a corresponding low frequency band of the ignition frequency of a commonly-used engineering machinery engine.

Description

The reactive muffler structure of a kind of perforated pipe and the combination of narrow slit resonant cavity

Technical field

The utility model relates to a kind of model muffler structure, the reactive muffler structure of especially a kind of perforated pipe and the combination of narrow slit resonant cavity.

Background technique

Reactive muffler is current effective one of main path of control engine exhaust sound in engineering machinery field, the design level of silencing apparatus directly affects the location of China's engineering machinery in global engineering machinery field, effectively control noise pollution, to national production with live significant; The height of Muffler Performance is mainly reflected in acoustic attenuation performance and two aspects of aerodynamic quality, and its effectively evaluating index is respectively transmission loss and the pressure loss; When increasing the silencing apparatus transmission loss, guarantee that its pressure loss is in the scope of motor requirement, be the core requirement of muffler desing, be also the difficult point of muffler desing simultaneously.

The perforated pipe noise elimination structure is resonant noise elimination structure at present commonly used, wherein lead directly to the perforated pipe structure, owing to air-flow being had to very strong leading role, the pressure loss is less, but because most of air-flow directly passes through from straight tube, can not be in expansion cavity fully discharge, and high band there will be failure phenomenon, so soundproof effect is general; And for crossing current perforated pipe structure, wherein air-flow is wanted all by the aperture on perforated pipe, to flow out, strengthened acoustic impedance, and not there will be failure phenomenon at high band, the relatively straight-through perforated tube silencer of soundproof effect will be got well, but, because air-flow is wanted aperture on whole flowing pipes, caused the relatively high pressure loss.

The model utility content

The purpose of this utility model is to solve the prior art deficiency, noise elimination characteristics according to the perforated pipe structure, take full advantage of structure space, combination narrow slit resonant cavity noise elimination structure, proposed a kind of rational in infrastructure, technique is simple, the pressure loss is little, sound deadening capacity is large, the combination reactive muffling structure that is applicable to engineering machinery of long service life;

For achieving the above object, the utility model adopts following technical proposals:

The reactive muffler structure of a kind of perforated pipe and the combination of narrow slit resonant cavity, comprise cylindrical shell, air inlet perforated pipe and crossing current perforated pipe, described cylindrical shell is divided into two chambers in left and right by longitudinal baffle II, its left chamber is divided into upper and lower two chambers by lateral partitions again, and between upper and lower two chambers, communicate, described lower chambers is separated by longitudinal baffle I; Described air inlet perforated pipe is through lower chambers and longitudinal baffle I, and described crossing current perforated pipe arrives in right chamber through upper chamber; The top of right chamber communicates with steam outlet pipe.

Be set with a straight-through perforated pipe in described air inlet perforated pipe, described straight-through perforated pipe has been communicated with right chamber and left chamber.

Be equipped with some apertures on described air inlet perforated pipe, crossing current perforated pipe and straight-through perforated pipe.

The offset or dish of described air inlet perforated pipe and tubular axis is barrel diameter 1/4, and its punching rate is controlled at 18% ± 2%, and the bore dia of perforation is 5mm, is positioned at all evenly perforation of pipeline section of silencer cylinder.

Described straight-through perforated pipe and air inlet perforated pipe are coaxially arranged, and its punching rate is controlled at 12% ± 2%, and the bore dia of perforation is 4mm, and integral body is evenly bored a hole, the pipe range of dividing plate left and right side be respectively the lower chambers on the left side and right chamber chamber long 1/2.

The offset or dish of described crossing current perforated pipe and silencer cylinder axis is barrel diameter 1/4, its punching rate is controlled at 12% ± 2%, the bore dia of perforation is 4mm, the middle position of perforated section in upper chamber, perforation length be the epicoele chamber long 1/2, the extension of right chamber be right chamber chamber long 1/4.

Described lateral partitions is tightly connected with the barrel of silencing apparatus diametrically, with chamber, two ends wall, the narrow slit that width is 4mm is arranged diametrically.

The beneficial effects of the utility model are, (1) silencing apparatus is selected the central core of circulation of direct current perforated pipe as air-flow, therefore have aerodynamic characteristics preferably, flow resistance, the pressure loss that has reduced structure generation is little, reproduced air-flow noise is little, and manufacturing process is simple; (2) be used in combination crossing current perforated pipe structure, and take full advantage of the silencing apparatus inner space, use dividing plate that chamber is separated, be equivalent to the narrow slit resonant cavity of having connected, strengthened the acoustic impedance of structure, increased the loss to acoustic energy, thereby improved sound deadening capacity.(3) selection of each perforated pipe punching rate, through too much taking turns test simulation, in conjunction with the investigation index of flow dynamics and acoustic attenuation performance, obtains comparatively reasonably scope; Thereby realize that sound deadening capacity has also had and significantly improved when effectively controlling the silencing apparatus exhaust back pressure.

The accompanying drawing explanation

Fig. 1 is the utility model plan view;

Fig. 2 be in Fig. 1 A-A to cross-sectional view;

Wherein: 1 silencer cylinder, 2 air inlet perforated pipes, 3 chamber I, 4 longitudinal baffle I, 5 chamber II, 6 straight-through perforated pipes, 7 chamber IV, 8 steam outlet pipes, 9 longitudinal baffle II, 10 crossing current perforated pipes, 11 chamber III, 12 lateral partitions.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Shown in Fig. 1, the reactive muffler structure of a kind of perforated pipe of description and the combination of narrow slit resonant cavity, comprise that cylindrical shell 1, suction tude 2, steam outlet pipe 8, straight-through perforated pipe 6, crossing current perforated pipe 10, lateral partitions 12 and longitudinal baffle I 4, longitudinal baffle II 9 form; By lateral partitions 12 and longitudinal baffle I 4, longitudinal baffle II 9, cylindrical shell 1 is divided into to four separate chambers in described cylindrical shell: chamber I 3, chamber II 5, chamber III 11 and chamber IV 7; Described air inlet perforated pipe 2 and the coaxial offset placement of straight-through perforated pipe 6, chamber IV 7 directly is communicated with suction tude 2 by straight-through perforated pipe 6; Described air inlet perforated pipe 2 is divided into left and right two-part by longitudinal baffle 4, and with chamber I 3 and chamber II 5, is connected respectively; Described lateral partitions 12 is tightly connected with circumferential barrel, with chamber, both sides wall, leaves interval of slit, and chamber I 3 and chamber II 5 are connected with chamber III 11 by the narrow slit of both sides simultaneously; Chamber III 11 is communicated with chamber IV 7 by crossing current perforated pipe 10 again; Chamber IV 7 directly is connected with steam outlet pipe 8.

Described air inlet perforated pipe 2 and straight-through perforated pipe 6, crossing current perforated pipe 10 are 1/4 of barrel diameter with the offset or dish of silencer cylinder 1 axis;

Described air inlet perforated pipe 2, the offset or dish of itself and silencer cylinder 1 axis is barrel diameter 1/4, and its punching rate is controlled at 18% ± 2%, and the perforation bore dia is 5mm, is positioned at all evenly perforation of pipeline section of silencer cylinder;

Described straight-through perforated pipe 6, itself and air inlet perforated pipe 2 are coaxially arranged, its punching rate is controlled at 12% ± 2%, the perforation bore dia is 4mm, integral body is evenly bored a hole, the pipe range of dividing plate left and right side be respectively the chamber II and chamber IV chamber long 1/2;

Described crossing current perforated pipe 11, the offset or dish of itself and silencer cylinder 1 axis is barrel diameter 1/4, its punching rate is controlled at 12% ± 2%, the perforation bore dia is 4mm, the middle position of perforated section in the chamber III, perforation length is 1/2 of chamber III chamber length, and the extension in the IV chamber is 1/4 of chamber IV chamber length;

Described lateral partitions 12, be tightly connected with the barrel of silencing apparatus diametrically, with chamber, two ends wall, the narrow slit that width is 4mm arranged diametrically.

During use, the gas flowed into by suction tude 2, a part, through the aperture on perforated pipe 2, enters respectively chamber I 3 and chamber II 5, and a part of gas flow is crossed perforated section, and advances people's chamber IV 7 by straight-through perforated pipe 6; Flow into chamber I 3 and chamber II 5 gases by and enter chamber III 11 to the narrow slit between dividing plate 7 and cylinder chamber wall, then enter chamber IV 7 by the perforated pipe 10 that flows over; Finally, the air-flow that imports chamber IV 7 is all discharged by steam outlet pipe 8.

The above; although by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims

1. the reactive muffler structure of a perforated pipe and the combination of narrow slit resonant cavity, it is characterized in that: comprise cylindrical shell, air inlet perforated pipe and crossing current perforated pipe, described cylindrical shell is divided into two chambers in left and right by longitudinal baffle II, its left chamber is divided into upper and lower two chambers by lateral partitions again, and between upper and lower two chambers, communicate, described lower chambers is separated by longitudinal baffle I; Described air inlet perforated pipe is through lower chambers and longitudinal baffle I, and described crossing current perforated pipe arrives in right chamber through upper chamber; The top of right chamber communicates with steam outlet pipe.

2. acoustic wave filter structure as claimed in claim 1, it is characterized in that: be set with a straight-through perforated pipe in described air inlet perforated pipe, described straight-through perforated pipe has been communicated with right chamber and left chamber.

3. acoustic wave filter structure as claimed in claim 2, is characterized in that: on described air inlet perforated pipe, crossing current perforated pipe and straight-through perforated pipe, be equipped with some apertures.

4. acoustic wave filter structure as claimed in claim 1, it is characterized in that: the offset or dish of described air inlet perforated pipe and tubular axis is barrel diameter 1/4, its punching rate is controlled at 18% ± 2%, and the bore dia of perforation is 5mm, is positioned at all evenly perforation of pipeline section of silencer cylinder.

5. acoustic wave filter structure as claimed in claim 2, it is characterized in that: described straight-through perforated pipe and air inlet perforated pipe are coaxially arranged, its punching rate is controlled at 12% ± 2%, the bore dia of perforation is 4mm, whole evenly perforation, the pipe range of dividing plate left and right side be respectively the lower chambers on the left side and right chamber chamber long 1/2.

6. acoustic wave filter structure as claimed in claim 1, it is characterized in that: the offset or dish of described crossing current perforated pipe and silencer cylinder axis is barrel diameter 1/4, its punching rate is controlled at 12% ± 2%, the bore dia of perforation is 4mm, the middle position of perforated section in upper chamber, perforation length be the epicoele chamber long 1/2, the extension of right chamber be right chamber chamber long 1/4.

7. acoustic wave filter structure as claimed in claim 1, it is characterized in that: described lateral partitions is tightly connected with the barrel of silencing apparatus diametrically, with chamber, two ends wall, the narrow slit that width is 4mm is arranged diametrically.