CN205936764U - Three cavity impedance complex mufflers - Google Patents

Abstract

The utility model discloses a three cavity impedance complex mufflers belongs to silencer technical field. This silencer includes intake pipe and the outlet duct that sets up on casing and the casing, separate for first cavity, second cavity and third cavity by foraminiferous first baffle and second baffle along the orientation of admitting air in the casing, first baffle is passed in proper order to the intake pipe and the second baffle stretches into in the third cavity, the outlet duct passes the second baffle and stretches into in the second cavity, the parcel had the steel wool outside the intake pipe distributed on the pipe wall of first cavity and has a plurality of through -holes and its perforated pipe section, and it is equipped with structure of necking just to give vent to anger to hold, it has noise elimination sponge to fill between first cavity and the steel wool, the outlet duct distributes on the pipe wall of second cavity has a plurality of through -holes and its inlet end to be equipped with the closure plate. This silencer has higher low medium -high frequency noise elimination ability.

Description

A kind of three cavity impedance complex mufflers

Technical field

This utility model belongs to acoustic filter technical field, particularly to a kind of three cavity impedance complex mufflers.

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, this air inlet pipe and escape pipe both pass through front dividing plate and rear bulkhead in housing, air inlet pipe and going out Trachea can arrange through hole on the tube wall of second chamber.

Applicant finds that when realizing this patent existing acoustic filter can not be respectively provided with good noise elimination in senior middle school's low-frequency range Effect.

Content of the invention

In order to solve the above problems, this utility model embodiment provides a kind of three cavity impedance complex mufflers, and this disappears Sound utensil has higher low, middle and high frequency acoustical absorptivity.Described technical scheme is as follows：

This utility model embodiment provides a kind of three cavity impedance complex mufflers, arranges including on housing 1 and housing 1 Air inlet pipe 2 and escape pipe 3, be divided into the along airintake direction by the first dividing plate 4 with holes and second partition 5 in described housing 1 One chamber 6, second chamber 7 and the 3rd chamber 8；Described air inlet pipe 2 sequentially passes through the first dividing plate 4 and second partition 5 stretches into the 3rd In chamber 8, described escape pipe 3 stretches in second chamber 7 through second partition 5, and described air inlet pipe 2 is in the tube wall of first chamber 6 On multiple through holes 9 are distributed with and its perforated sections is wrapped with steel wool 10, fill between described first chamber 6 and steel wool 10 There is noise elimination cotton 11, multiple through holes 9 are distributed with the tube wall of second chamber 7 for described escape pipe 3 and its inlet end is provided with closure plate 12.

Wherein, the housing 1 in this utility model embodiment is special-shaped shell body, by upper shell 14 and lower casing 15 relative combinations Form.

Wherein, the outlet side of the air inlet pipe 2 in this utility model embodiment is throat structure 13.

Wherein, through hole 9 aperture in the air inlet pipe 2 in this utility model embodiment is more than through hole 9 hole on escape pipe 3 Footpath.

Wherein, the escape pipe 3 in this utility model embodiment stretches into second chamber 7 to the position near the first dividing plate 4.

The beneficial effect brought of technical scheme that this utility model embodiment provides is：This utility model embodiment provides A kind of three cavity impedance complex mufflers, acoustic filter is divided into three chambers using dividing plate by this acoustic filter；Second chamber and the 3rd Chamber is separated using Perforated clapboard, forms expansion noise elimination structure in parallel, and air-flow passes through perforation and enters the second chamber from the 3rd chamber Room, has aperture shift frequency soundproof effect, and entirely second and third chamber forms the resistance knot possessing good acoustical absorptivity to medium and low frequency Structure；First chamber utilizes air inlet pipe through-hole to form low-frequency resonance noise elimination structure with cavity, simultaneously the sound absorption of within the chamber filling glass silk Cotton, increases the acoustical absorptivity of high-frequency noise.Summary structure design, this acoustic filter is directed to electromotor basic, normal, high frequency noise to be had There is good acoustical absorptivity.

Brief description

Fig. 1 is the structural representation of the three cavity impedance complex mufflers that this utility model embodiment provides；

Fig. 2 is the structural representation of the housing of three cavity impedance complex mufflers 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 through holes, 10 steel wool, 11 noise elimination cotton, 12 closure plates, 13 throat structures, shell, 15 lower casings on 14.

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 three cavity impedance complex mufflers, including housing 1 He The air inlet pipe 2 of housing 1 about two ends setting and escape pipe 3 etc..Wherein, in housing 1 along airintake direction by the first dividing plate 4 with holes It is divided into first chamber 6, second chamber 7 and the 3rd chamber 8 with second partition 5；Wherein, air inlet pipe 2 and escape pipe 3 transversely set Put, 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.Wherein, on State structure essentially identical with existing three chamber acoustic filters, difference is：This utility model embodiment provide air inlet pipe 2 by Sequentially pass through the first dividing plate 4 outside housing 1 and second partition 5 stretch in the 3rd chamber 8, escape pipe 3 by housing 1 outer pass through second every Plate 5 stretches in second chamber 7.Wherein, air inlet pipe 2 is distributed with multiple through holes 9 and its perforated sections on the tube wall of first chamber 6 It is wrapped with steel wool 10 for covering the through hole 9 on this pipeline section, between first chamber 6 and steel wool 10, be filled with noise elimination cotton 11, that is, first chamber 6 be filled with noise elimination cotton 11.Wherein, escape pipe 3 be distributed with the tube wall of second chamber 7 multiple through holes 9 and Its inlet end（Right-hand member）It is provided with closure plate 12 for closing the inlet end of escape pipe 3.

Wherein, referring to Fig. 1, escape pipe in this utility model embodiment 3 and air inlet pipe 2 parallel and adjacent to, air inlet pipe 2 with The caliber of escape pipe 3 equal and be 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 14 and lower casing 15 relative combinations, be provided with inside housing 1 for support air inlet pipe 2 with The support of escape pipe 3.

Wherein, referring to Fig. 1, the outlet side of the air inlet pipe 2 in this utility model embodiment is used for, for throat structure 13, the frequency that disappears. Specifically, the caliber of throat structure 13 is 1-3mm less than the caliber of air inlet pipe 2, and its length is 17-22mm.

Wherein, through hole 9 aperture (being specifically as follows 6-10mm) in the air inlet pipe 2 in this utility model embodiment is more than Through hole 9 aperture (being specifically as follows 3-4mm) on trachea 3, its number of openings is the 1/4-1/ of through hole 9 quantity on escape pipe 3 3.

Wherein, referring to Fig. 1, the escape pipe 3 in this utility model embodiment stretches into second chamber 7 near the first dividing plate 4 Position.

Wherein, the noise elimination cotton 11 in this utility model embodiment is glass fiber sound absorption cotton.

This utility model embodiment provides a kind of three cavity impedance complex mufflers, and this acoustic filter will be eliminated the noise using dividing plate Device is divided into three chambers；Second chamber is separated using Perforated clapboard with the 3rd chamber, forms expansion noise elimination structure in parallel, air-flow Second chamber is entered from the 3rd chamber by perforation, there is aperture shift frequency soundproof effect, entirely second and third chamber formation centering is low Frequency possesses the resistance structure of good acoustical absorptivity；First chamber utilizes air inlet pipe through-hole and cavity to form low-frequency resonance noise elimination knot Structure, the cotton of within the chamber filling glass silk sound absorption simultaneously, increase the acoustical absorptivity of high-frequency noise.Summary structure design, this noise elimination Device has good acoustical absorptivity for electromotor basic, normal, high frequency noise.

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 three cavity impedance complex mufflers, 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, described air inlet pipe (2) sequentially pass through the first dividing plate (4) and second every Plate (5) stretches in the 3rd chamber (8), and described escape pipe (3) is stretched in second chamber (7) through second partition (5), described air inlet Multiple through holes (9) are distributed with the tube wall of first chamber (6) for pipe (2) and its perforated sections is wrapped with steel wool (10), institute State and between first chamber (6) and steel wool (10), be filled with noise elimination cotton (11), described escape pipe (3) is in the pipe of second chamber (7) Multiple through holes (9) are distributed with wall and its inlet end is provided with closure plate (12).

2. three cavity impedance complex mufflers according to claim 1 are it is characterised in that the giving vent to anger of described air inlet pipe (2) Hold as throat structure (13).

3. three cavity impedance complex mufflers according to claim 1 are it is characterised in that logical in described air inlet pipe (2) Hole (9) aperture is more than through hole (9) aperture on escape pipe (3).

4. three cavity impedance complex mufflers according to claim 1 are it is characterised in that described escape pipe (3) stretches into Two chambers (7) are to the position near the first dividing plate (4).