CN205936765U - Impedance composite muffler - Google Patents

Abstract

The utility model discloses an impedance composite muffler belongs to silencer technical field. This silencer includes intake pipe and the outlet duct that sets up on casing and the casing, separated for first cavity, second cavity and third cavity by foraminiferous first baffle and second baffle along the orientation of admitting air in the casing, it has noise elimination sponge to pack in the second cavity, and the intake pipe is passed during first baffle and second baffle stretch into the third cavity in proper order, and the outlet duct passes the second baffle in proper order and first baffle stretches into in the first cavity, the silencer still includes the intervalve in the casing, and the intervalve runs through the second cavity and stretches into first cavity and third cavity intercommunication, intervalve one section interior appointed length of third cavity and form resonance sound -attenuating structure with the third cavity, and cloth is equallyd divide to outlet duct and intervalve on the pipe wall of second cavity have a plurality of through -holes. Above -mentioned structure makes this silencer possess better medium -high frequency noise elimination ability.

Description

A kind of impedance composite muffler

Technical field

This utility model belongs to acoustic filter technical field, particularly to a kind of impedance composite muffler.

Background technology

At present, with social fast development, engineering machinery in society using more and more extensive, the making an uproar of engineering machinery Sound, essentially from electromotor, can substantially reduce sound pollution using acoustic filter rational in infrastructure.Existing acoustic filter is pressed at present Noise elimination mechanism can be divided into six types, and that is, dissipative muffler, reactive muffler, impedance composite muffler, microperforated panel disappear Sound device, micropole diffusor and active silencer.

As a critical component reducing automobile engine to exhaust noise, it is by reducing, decaying aerofluxuss to acoustic filter Fluctuation pressure is eliminating noise.The technical scheme of existing three chamber acoustic filters is：Include a housing, dress is on the housing Air inlet pipe and escape pipe, inner space is divided into the first chamber along airintake direction by front dividing plate with holes and rear bulkhead by this housing Room, second chamber and the 3rd chamber, second chamber is filled with noise elimination cotton, this air inlet pipe and escape pipe both pass through in housing front every Plate and rear bulkhead, air inlet pipe and escape pipe arrange through hole on the tube wall of second chamber.

Applicant finds that when realizing this patent existing acoustic filter can not have good soundproof effect in medium-high frequency section.

Content of the invention

In order to solve the above problems, this utility model embodiment provides a kind of impedance composite muffler, this acoustic filter There is higher medium-high frequency acoustical absorptivity.Described technical scheme is as follows：

This utility model embodiment provides a kind of impedance composite muffler, including entering of arranging on housing 1 and housing 1 Trachea 2 and escape pipe 3, are divided into the first chamber along airintake direction by the first dividing plate 4 with holes and second partition 5 in described housing 1 Room 6, second chamber 7 and the 3rd chamber 8；It is filled with noise elimination cotton 9, described air inlet pipe 2 sequentially passes through first in described second chamber 7 Dividing plate 4 and second partition 5 extend in the 3rd chamber 8, and described escape pipe 3 sequentially passes through second partition 5 and the first dividing plate 4 stretches into To in first chamber 6；Described acoustic filter also includes the intervalve 10 in housing 1, and described intervalve 10 runs through second chamber 7 by One chamber 6 is connected with the 3rd chamber 8, and described intervalve 10 is stretched into the interior one section of designated length of the 3rd chamber 8 and formed with the 3rd chamber 8 Resonant silencing structure, described escape pipe 3 and intervalve 10 are distributed with multiple through holes 11 on the tube wall of second chamber 5.

Wherein, the housing 1 in this utility model embodiment is special-shaped shell body, by upper shell 12 and lower casing 13 relative combinations Form.

Specifically, the length of pipe section that the intervalve 10 in this utility model embodiment stretches into the 3rd chamber 8 is the 3rd chamber 8 The 3/10-1/2 of length.

Wherein, the aperture of through hole 11 on escape pipe 3 tube wall in this utility model embodiment and quantity is all and intervalve The aperture of through hole 11 on 10 tube walls and quantity are equal, and the position of through hole 11 distribution corresponds to.

Wherein, the intervalve 10 in this utility model embodiment and air inlet pipe 2 are respectively arranged on the both sides of escape pipe 3.

The beneficial effect brought of technical scheme that this utility model embodiment provides is：This utility model embodiment provides A kind of impedance composite muffler, acoustic filter is divided into three cavitys by two dividing plate, using changeover portion, forms threeway three chamber and disappears Acoustic form；Add glass fiber sound absorption cotton in second chamber, form resistive sound absorption structure；Perforated clapboard is by first chamber and the second chamber Room UNICOM, forms and interferes soundproof effect；Form resonant silencing structure in the 3rd within the chamber changeover portion insertion portion with cavity.Above-mentioned Structure makes this acoustic filter possess preferable medium-high frequency acoustical absorptivity.

Brief description

Fig. 1 is the structural representation of the impedance composite muffler that this utility model embodiment provides；

Fig. 2 is the structural representation of the housing of impedance composite muffler that this utility model embodiment provides；

Fig. 3 is the A of Fig. 1 to sectional view；

Fig. 4 is the B of Fig. 1 to sectional view.

In figure：1 housing, 2 air inlet pipe, 3 escape pipes, 4 first dividing plates, 5 second partitions, 6 first chambers, 7 second chambers, 8 3rd chamber, 9 noise elimination cotton, 10 intervalves, 11 through holes, shell, 13 lower casings on 12.

Specific embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, new to this practicality below in conjunction with accompanying drawing Type is described in further detail.

Referring to Fig. 1-4, this utility model embodiment provides a kind of impedance composite muffler, and this acoustic filter includes housing 1 and air inlet pipe 2 and the escape pipe 3 etc. of the setting of housing 1 about two ends.Wherein, in housing 1 along airintake direction by with holes first every Plate 4 and second partition 5 are divided into first chamber 6, second chamber 7 and the 3rd chamber 8；Wherein, air inlet pipe 2 and escape pipe 3 are along horizontal stroke To setting, housing 1 is divided into three cavitys being arranged side by side by the first dividing plate 4 and the longitudinally parallel setting of second partition 5.Its In, said structure is essentially identical with existing three chamber acoustic filters, and difference is：The second of this utility model embodiment offer It is filled with noise elimination cotton 9, air inlet pipe 2 sequentially passes through the first dividing plate 4 outward by housing 1 and second partition 5 extend into the 3rd chamber in chamber 7 In room 8, escape pipe 3 sequentially passes through second partition 5 outward by housing 1 and the first dividing plate 4 extend in first chamber 6.Wherein, this reality Apply the intervalve 10 that the acoustic filter in example also includes in housing 1, this intervalve 10 is transversely arranged and it runs through second chamber 7 general First chamber 6 is connected with the 3rd chamber 8, and the outlet side of intervalve 10 is stretched into the interior one section of designated length of the 3rd chamber 8 and formed transition Duan Yu tri- chamber 8 forms resonant silencing structure, and the other end only slightly stretches into first chamber 6.Wherein, escape pipe 3 and in Between pipe 10 multiple through holes 11 are distributed with the tube wall of second chamber 5.

Wherein, referring to Fig. 1, the air inlet pipe 2 in this utility model embodiment, escape pipe 3 are transversely mutual with intervalve 10 It is arranged in parallel and caliber is equal is 45-55mm.

Wherein, referring to Fig. 2, the housing 1 in this utility model embodiment is special-shaped shell body, its second chamber 7 and the 3rd chamber Similar to rectangular chamber, its first chamber 6 is shaped chamber as depicted for room 8, and escape pipe 3 inlet end changes towards its camber line Side.Wherein, housing 1 is formed by upper shell 12 and lower casing 13 relative combinations, be provided with inside housing 1 for support air inlet pipe 2, Escape pipe 3 and the support of intervalve 10.

Specifically, the pipeline section lateral length that the intervalve 10 in this utility model embodiment stretches into the 3rd chamber 8 is the 3rd The 3/10-1/2 of chamber 8 lateral length.

Wherein, the aperture of through hole 11 on escape pipe 3 tube wall in this utility model embodiment and quantity is all and intervalve The aperture of through hole 11 on 10 tube walls and quantity are equal, and the position of through hole 11 distribution corresponds to.Wherein, the aperture of through hole 9 is permissible For 3-4mm.

Wherein, referring to Fig. 1, the intervalve 10 in this utility model embodiment and air inlet pipe 2 are respectively arranged on the two of escape pipe 3 Side.Further, the inlet end of escape pipe 3 stretch into first chamber 6 length be more than intervalve 10 inlet end stretch into the first chamber The length of room 6.

Wherein, the noise elimination cotton 9 in this utility model embodiment is glass fiber sound absorption cotton.

This utility model embodiment provides a kind of impedance composite muffler, and acoustic filter is divided into three by two dividing plate Cavity, using changeover portion, forms threeway three chamber noise elimination structure；Add glass fiber sound absorption cotton in second chamber, form resistive sound absorption Structure；Perforated clapboard, by first chamber and second chamber UNICOM, forms and interferes soundproof effect；Insert in the 3rd within the chamber changeover portion Part forms resonant silencing structure with cavity.Said structure makes this acoustic filter possess preferable medium-high frequency acoustical absorptivity.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all in this practicality Within new spirit and principle, any modification, equivalent substitution and improvement made etc., should be included in guarantor of the present utility model Within the scope of shield.

Claims (4)

1. a kind of impedance composite muffler, the air inlet pipe (2) including housing (1) and the upper setting of housing (1) and escape pipe (3), In described housing (1) along airintake direction by the first dividing plate (4) with holes and second partition (5) be divided into first chamber (6), second Chamber (7) and the 3rd chamber (8)；It is characterized in that, it is filled with noise elimination cotton (9), described air inlet pipe in described second chamber (7) (2) sequentially pass through the first dividing plate (4) and second partition (5) extend in the 3rd chamber (8), described escape pipe (3) sequentially passes through Second partition (5) and the first dividing plate (4) extend in first chamber (6)；

Described acoustic filter also includes the intervalve (10) in housing (1), and described intervalve (10) runs through second chamber (7) by first Chamber (6) is connected with the 3rd chamber (8), and described intervalve (10) stretches into the interior one section of designated length of the 3rd chamber (8) and the 3rd chamber Room (8) forms resonant silencing structure, and described escape pipe (3) and intervalve (10) are distributed with the tube wall of second chamber (7) Multiple through holes (11).

2. impedance composite muffler according to claim 1 is it is characterised in that described intervalve (10) stretches into the 3rd chamber The length of pipe section of room (8) is the 3/10-1/2 of the 3rd chamber (8) length.

3. impedance composite muffler according to claim 1 is it is characterised in that logical on described escape pipe (3) tube wall The aperture in hole (11) and quantity are all equal with the aperture of the through hole (11) on intervalve (10) tube wall and quantity, and through hole (11) point The position of cloth corresponds to.

4. impedance composite muffler according to claim 1 is it is characterised in that described intervalve (10) and air inlet pipe (2) it is respectively arranged on the both sides of escape pipe (3).