CN203321650U

CN203321650U - Transverse flow perforated pipe silencer structure with choked flow barrier

Info

Publication number: CN203321650U
Application number: CN2013204037311U
Authority: CN
Inventors: 周以齐; 薛源; 王丽; 白儒
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 transverse flow perforated pipe silencer structure with a choked flow barrier. The transverse flow perforated pipe silencer structure comprises an expansion chamber barrel body, a transverse flow perforated pipe, a blocking plate and barrier rings. The transverse flow perforated pipe is axially arranged along the expansion chamber barrel body, and the interior of the transverse flow perforated pipe is divided into a front part and a back part through the blocking plate, wherein the front part is not communicated with the back part. The part between the transverse flow perforated pipe and the expansion chamber barrel body is divided into a plurality of cavity chambers through the barrier rings. Each barrier ring comprises a barrier inner ring and a barrier outer ring, wherein an annular gap is formed between the barrier inner ring and the barrier outer ring. The cavity chambers are mutually communicated through the annular gaps, and the transverse flow perforated pipe is communicated with all cavity chambers through perforated holes in the transverse flow perforated pipe. The transverse flow perforated pipe silencer structure is reasonable, exhaust back pressure is obviously reduced, the frequency characteristic of a silencer is improved, and a designing scheme through which the silencer is designed exquisitely is provided.

Description

A kind of crossing current perforated tube silencer structure with choked flow barrier

Technical field

The utility model relates to a kind of crossing current perforated tube silencer structure, especially a kind of crossing current perforated tube silencer structure with choked flow barrier.

Background technique

Reactive muffler is one of main path of existing Control Engineering mechanical noise, the raising of muffler desing level has important meaning for promoting China's overall engineering machine quality, and insertion loss and the pressure loss are to estimate two very important evaluation indexes of Sound Elimination Performance of Mufflers and aerodynamic quality.Design studies improves silencing apparatus, makes it when increasing transmission loss, guarantee the pressure loss in the scope of motor requirement with the interior important means that becomes noise reduction.The crossing current perforated tube silencer, because having wider noise elimination frequency band and good acoustic attenuation performance, is widely used in internal combustion engine exhaust noise and controls.

Chinese patent 200420038466.2 discloses a kind of perforated tube silencer that is applicable to internal-combustion engine, with dividing plate, the inner chamber of housing is divided into to two expansion chambers in left and right, be equipped with perforated pipe on enclosure interior two ends and dividing plate, outlet pipe and tail pipe are connected and communicate with perforated pipe on two ends respectively.Perforated pipe at least is comprised of two concentric metal tubes, staggers in metal tube upper vent hole position.Have advantages of that circulating resistance is little and do not produce regenerated noise, but complex structure, and effectively do not control exhaust back pressure.

The model utility content

The purpose of this utility model is for overcoming the deficiency of prior art structure, provide a kind of rational in infrastructure, acoustical behavior is good, improves frequency characteristic, to the soundproof effect of engine exhaust, especially exhaust back pressure has the novel reactive muffler structure for engineering machinery of positive effect.

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

A kind of crossing current perforated tube silencer structure with choked flow barrier, comprise the expansion chamber cylindrical shell, the crossing current perforated pipe, closure plate, retainer, described crossing current perforated pipe is axial arranged along the expansion chamber cylindrical shell, two-part of isolation before and after being divided into by closure plate in the crossing current perforated pipe, vertically be divided into a plurality of chambers by retainer between described crossing current perforated pipe and expansion chamber cylindrical shell, described retainer comprises ring and barrier outer shroud in barrier, and form the gap of ring-type in barrier between ring and barrier outer shroud, gap by ring-type between described each chamber is interconnected, described crossing current perforated pipe is communicated with each chamber by the perforation on it.

Described chamber at least comprises three.

Described chamber has four, and retainer has 3, is respectively retainer I, retainer II, and retainer III, described retainer I comprises ring I, barrier outer shroud I in barrier; Described retainer II comprises ring II, barrier outer shroud II in barrier; Described retainer III comprises ring III, barrier outer shroud III in barrier.

In described barrier, ring I, barrier outer shroud I form the gap I of ring-type; In barrier, ring II, barrier outer shroud II form the gap II of ring-type; In described barrier, ring I II, barrier outer shroud I II form the gap III of ring-type; The gap III of the gap I of described ring-type, the gap II of ring-type and ring-type is with respect to the setting straggly of the longitudinal direction of expansion chamber cylindrical shell.

In described barrier, ring I internal diameter is 50mm, and external diameter is 90mm; Described barrier outer shroud I internal diameter is 120mm, and external diameter is 150mm; In barrier, ring II internal diameter is 50mm, and external diameter is 105mm; Described barrier outer shroud II internal diameter is 130mm, and external diameter is 150mm; In barrier, ring III internal diameter is 50mm, and external diameter is 105mm; Described barrier outer shroud III internal diameter is 130mm, and external diameter is 150mm.

It is 15% ± 2% that the punching rate of described crossing current perforated pipe is controlled, and hush pipe is provided with the aperture that some diameters are 5mm.

The beneficial effects of the utility model are that (1) takes classical crossing current perforated pipe expansion chamber structure, has aerodynamic performance preferably, has reduced the flow resistance of structure generation, reduces reproduced air-flow noise simultaneously; (2) selection of punching rate and choked flow barrier, through too much taking turns test simulation, in conjunction with the investigation index of flow dynamics and acoustic attenuation performance, obtains comparatively reasonably scope.When having improved the full frequency band sound deadening capacity, greatly reduced exhaust back pressure, obtained good soundproof effect.(3) by a large amount of acoustics emulation, draw, being provided with of choked flow barrier structure be beneficial to regulate silencing apparatus pass through frequency and crest frequency, improve the frequency characteristic of silencing apparatus, for the Fine design of silencing apparatus provides a kind of design means.

The accompanying drawing explanation

Fig. 1 is the utility model plan view;

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

Fig. 3 be in Fig. 1 B-B to cross-sectional view.

1 expansion chamber cylindrical shell wherein, 2 chamber I, 3 closure plates, ring I in 4 barriers, 5 barrier outer shroud I, 6 chamber III, 7 crossing current perforated pipes, ring II in 8 barriers, 9 barrier outer shroud II, 10 chamber II, 11 chamber IV, ring III in 12 barriers, 13 barrier outer shroud III.

Embodiment

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

As shown in Figure 1, Figure 2 and Figure 3, crossing current perforated tube silencer structure with choked flow barrier, comprise in expansion chamber cylindrical shell 1, crossing current perforated pipe 7, closure plate 3, barrier and encircle II 8 in ring I 4, barrier outer shroud I 5, barrier, barrier outer shroud II 9, ring III12 in barrier, barrier outer shroud III13, in described expansion chamber cylindrical shell 1 by ring II 8 in ring I 4 in closure plate 3, barrier, barrier outer shroud I 5, two barriers, two barrier outer shroud II 9, be divided into cylindrical shell chamber I 2, chamber II 10, chamber III 6, the chamber IV 11 be interconnected by gap between the barrier structure; Described crossing current perforated pipe 7 is axial arranged along cylindrical shell, and disconnected two-part before and after being divided into by closure plate 3 in crossing current perforated pipe 7, be communicated with each chamber by the perforation on it respectively.

In described barrier, ring I 4 internal diameters are 50mm, and external diameter is 90mm; Described barrier outer shroud I 5 internal diameters are 120mm, and external diameter is 150mm; In barrier, ring II 8 internal diameters are 50mm, and external diameter is 105mm; Described barrier outer shroud II 9 internal diameters are 130mm, and external diameter is 150mm; In barrier, ring III12 internal diameter is 50mm, and external diameter is 105mm; Described barrier outer shroud III13 internal diameter is 130mm, and external diameter is 150mm.

In described barrier, ring I 4, barrier outer shroud I 5 form the gap I of ring-type; In barrier, ring II8, barrier outer shroud II9 form the gap II of ring-type; In described barrier, ring III12, barrier outer shroud III13 form the gap III of ring-type; The setting straggly of the longitudinal direction with respect to the expansion chamber cylindrical shell of the gap III of the gap I of described ring-type, the gap II of ring-type, ring-type.

During use, gas is entered by the inlet end of crossing current perforated pipe 7, the perforation of a part crossing current perforated pipe 7 forward part enters chamber I 2, gap I by 9 of ring II 8 and first barrier outer shroud II in first barrier after being expanded in chamber I 2 enters chamber II 10, and the perforation of another part crossing current perforated pipe 7 forward part directly enters in chamber II 10 is expanded.Gas enters chamber III 6 by the gap II of 5 of ring I 4 and barrier outer shroud I in barrier subsequently, a part is directly got back in crossing current perforated pipe 7 by the perforation on crossing current perforated pipe 7 rear sections, another part enters chamber IV 11 by the gap III of 9 of ring II 8 and second barrier outer shroud II in second barrier, by the perforation on crossing current perforated pipe 7 rear sections, get back in crossing current perforated pipe 7, last air-flow is discharged by the outlet side of crossing current perforated pipe 7 again.

Although above-mentioned, 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 crossing current perforated tube silencer structure with choked flow barrier, it is characterized in that: comprise the expansion chamber cylindrical shell, the crossing current perforated pipe, closure plate and retainer, described crossing current perforated pipe is axial arranged along the expansion chamber cylindrical shell, two-part of isolation before and after being divided into by closure plate in the crossing current perforated pipe, vertically be divided into a plurality of chambers by retainer between described crossing current perforated pipe and expansion chamber cylindrical shell, described retainer comprises ring and barrier outer shroud in barrier, and form the gap of ring-type in barrier between ring and barrier outer shroud, gap by ring-type between described each chamber is interconnected, described crossing current perforated pipe is communicated with each chamber by the perforation on it.

2. acoustic wave filter structure as claimed in claim 1, it is characterized in that: described chamber at least comprises three.

3. acoustic wave filter structure as claimed in claim 1, it is characterized in that: described chamber has four, and retainer has 3, is respectively retainer I, retainer II, retainer III, described retainer I comprises ring I, barrier outer shroud I in barrier; Described retainer II comprises ring II, barrier outer shroud II in barrier; Described retainer III comprises ring I II, barrier outer shroud I II in barrier.

4. acoustic wave filter structure as claimed in claim 3, is characterized in that: the gap I of ring I, barrier outer shroud I formation ring-type in described barrier; In barrier, ring II, barrier outer shroud II form the gap II of ring-type; In described barrier, ring I II, barrier outer shroud I II form the gap III of ring-type; The gap III of the gap I of described ring-type, the gap II of ring-type and ring-type is with respect to the setting straggly of the longitudinal direction of expansion chamber cylindrical shell.

5. acoustic wave filter structure as claimed in claim 4, is characterized in that, in described barrier, ring I internal diameter is 50mm, and external diameter is 90mm; Described barrier outer shroud I internal diameter is 120mm, and external diameter is 150mm; In barrier, ring II internal diameter is 50mm, and external diameter is 105mm; Described barrier outer shroud II internal diameter is 130mm, and external diameter is 150mm; In barrier, ring III internal diameter is 50mm, and external diameter is 105mm; Described barrier outer shroud III internal diameter is 130mm, and external diameter is 150mm.

6. acoustic wave filter structure as claimed in claim 1, is characterized in that, it is 15% ± 2% that the punching rate of described crossing current perforated pipe is controlled, and hush pipe is provided with the aperture that some diameters are 5mm.