CN202544980U

CN202544980U - Reactive muffler for engineering machine

Info

Publication number: CN202544980U
Application number: CN201220153815XU
Authority: CN
Inventors: 周以齐; 王丽; 方建华; 薛源; 窦青青; 徐新东
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2012-04-12
Filing date: 2012-04-12
Publication date: 2012-11-21
Anticipated expiration: 2022-04-12

Abstract

The utility model discloses a reactive muffler for an engineering machine. The reactive muffler comprises a flange plate, a connecting pipe, a barrel body and a smoke exhaust pipe, wherein the barrel body is divided into cavities I, II and III through a front baffle and a rear baffle from front to rear; two first muffling barrels in the cavities I and II are arranged on the front baffle; two second muffling barrels are arranged in the cavity II; a third muffling barrel is arranged in the cavity III; both the first muffling barrels and the second muffling barrels are axially arranged along the barrel body; the third muffling barrel is perpendicular to the first muffling barrels and the second muffling barrels; the connecting pipe and the smoke exhaust pipe are connected to the barrel body and perpendicularly and crossly arranged spatially; the connecting pipe is communicated with the cavity I; the smoke exhaust pipe is communicated with the cavity III; and the flange plate is connected with the cavity I through the connecting pipe. The reactive muffler is reasonable in structure, good in acoustic performance, long in service life and low in air stream regeneration noise, and has a remarkable noise elimination effect for low-, medium- and high-frequency noises in engine exhaust emission.

Description

The reactive muffler that is used for engineering machinery

Technical field

The utility model relates to a kind of silencing apparatus, especially a kind of reactive muffler that is used for engineering machinery.

Background technique

Engineering machinery is mainly used in industry as the major component of social development, agricultural, fields such as traffic.Yet the noise problem that it produced is a problem demanding prompt solution always.Reactive muffler has obtained extensive use as the silencer that the car combustion engine vent systems extensively adopts in fields such as engineering machinery, and the research and development of well behaved silencing apparatus have great importance.Because have that the operation operating mode of engineering machinery is abominable, the vibration of power and equipment (motor, fluid power system and power train etc.), can produce strong vibration and noise when pretending industry.Along with the modernization construction engineering development.Engineering machinery more and more develops towards complicated, maximization and speed up direction.Its vibration and noise problem seem more outstanding, and the noise of building construction has become one of the main noise source in city.Reactive muffler is one of main path of existing Control Engineering mechanical noise; The raising of muffler design level has important meaning for promoting China's engineering machinery complete machine quality, and inserting the loss and the pressure loss is to estimate two very important evaluation indexes of silencing apparatus acoustic attenuation performance and aerodynamic quality.The design studies silencing apparatus makes it when increasing transmission loss, guarantee the pressure loss in the scope of motor requirement with the interior important means that reduces noise that becomes.

Chinese patent ZL201020675590.5 discloses a kind of diesel engine silencer, and it comprises muffler body, is installed on suction tude and tailpipe on the muffler body; Said muffler body is divided into three noise elimination chambers by preceding dividing plate and rear bulkhead; Said suction tude links to each other with interpolation pipe; Dividing plate is provided with four gas diversion tubes that are communicated with first chamber and second chamber before said; Said rear bulkhead is provided with the perforated pipe that is communicated with second chamber and the 3rd chamber.But this patent is the straight-through type silencing apparatus, and air flow direction is single, does not make full use of offseting each other of air-flow.

Chinese patent ZL201110201160.9 discloses a kind of diesel engine exhaust muffler of composite structure; It comprises flange, muffler body, suction tude, tailpipe; Comprise the preceding perforated pipe that places muffler body inner, preceding interpolation pipe, back interpolation pipe and back perforated pipe, be provided with the preceding dividing plate and the rear bulkhead that muffler body are divided into three chambers in the said muffler body, said flange links to each other with preceding perforated pipe one end through suction tude; The center of dividing plate is provided with preceding interpolation pipe before said; N back interpolation pipe is set on the said rear bulkhead, and each back interpolation pipe is equal to the centre distance of rear bulkhead, total cross-section area of N back interpolation pipe is less than the cross-section area of preceding interpolation pipe; Wherein N >=2 and N are positive integer, and the front end of said tailpipe links to each other with back poling one end.But this patent is pure reactive muffler, does not use sound-absorbing material, and is not obvious at the acoustically effective of medium-high frequency section.

The model utility content

The purpose of the utility model is for overcoming the deficiency of above-mentioned existing technology; Provide a kind of rational in infrastructure, acoustical behavior is good, long service life; The air-flow regenerated noise is little, the noise elimination outstanding effect of the basic, normal, high audio-frequency noise of engine exhaust is used for the reactive muffler of engineering machinery.

For realizing above-mentioned purpose, the utility model adopts following technical proposals:

A kind of reactive muffler that is used for engineering machinery comprises flange plate, connecting tube, cylindrical shell, smoke-ejecting pipe, and interior the complying with by preceding through preceding dividing plate and rear bulkhead of said cylindrical shell is divided into chamber I, chamber II, chamber III to back time with cylindrical shell; Said preceding dividing plate is provided with two and is arranged in chamber I and two first hush pipes of chamber II, is provided with two second hush pipes in the chamber II, is provided with the 3rd hush pipe in the chamber III; Said first hush pipe and second hush pipe are all axial arranged along cylindrical shell; The 3rd hush pipe is arranged with second hush pipe is vertical with first hush pipe; Said connecting tube and smoke-ejecting pipe are vertically connected on the cylindrical shell; And the square crossing spatially of connecting tube and smoke-ejecting pipe arranges that connecting tube is communicated with chamber I, and smoke-ejecting pipe chamber III is communicated with; Said flange plate links to each other with chamber I through connecting tube.

Said first, second is the direct current perforated pipe with the 3rd hush pipe, and wherein, the length of first hush pipe in chamber I is 90% ± 5% of chamber I length, and the length in chamber II is 40% ± 5% of chamber II length; Second hush pipe runs through chamber II; The length of the 3rd hush pipe in chamber III is 90% ± 5% of chamber III length.

Said first, second be 25% ± 5% with the punching rate of the 3rd hush pipe, said first, second be 5mm with hole diameter on the 3rd hush pipe.

Said cylindrical shell is divided into inner barrel and outer cylinder body, and two ends are through end plate closes, and quieter material is equipped with in the centre of inner barrel and outer cylinder body.

The ingress of said first hush pipe, second hush pipe and the 3rd hush pipe is all sealed through closure plate.

The utility model has the advantages that: (1) three chamber composite structure, the link position of connecting tube and smoke-ejecting pipe and each perforated pipe makes the flow direction of air-flow reasonable, makes air-flow make full use of the flowing space of cavity; (2) use of a plurality of chambeies and a plurality of direct current perforated pipes is flowed air-flow in each chamber with in the aperture, increased sound deadening capacity, can also effectively reduce the air-flow regenerated noise, makes silencing apparatus that good noise elimination effect arranged in full frequency band; (3) rational perforated pipe punching rate and size design and distribution scheme have increased air communication effectively and have crossed area, thereby reduced the air-flow regenerated noise.(4) first chambers can receive the impact of exhaust, but the noise elimination effect in order to obtain can not increase the volume of first chamber arbitrarily, so increased the interpolation pipe shunting, makes it more reasonable.

Description of drawings

Fig. 1 is the utility model plan view;

Fig. 2 is the left sectional view at the utility model connecting tube axis place;

1 smoke-ejecting pipe wherein, 2 smoke evacuation bases, 3 the 3rd hush pipes, dividing plates before 4,5 second hush pipes; 6 cylindrical shells, 7 flange plate, 8 first hush pipes, 9 fixed plates, 10 second closure plates; 11. first closure plate, 12 the 3rd closure plates, 13 rear bulkheads, 14 end plates, 15 connecting tubes; 16 pipes that leak, 17 chamber I, 18 chamber II, 19 chamber III.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

As Fig. 1, Fig. 2, shown in, be used for the reactive muffler of engineering machinery, comprise flange plate 7, connecting tube 15, cylindrical shell 6, smoke-ejecting pipe 1, dividing plate 4 and rear bulkhead 13 are divided into chamber I 17, chamber II18, chamber III19 with cylindrical shell 6 successively before being provided with in the said cylindrical shell 6; Connecting tube 15 and smoke-ejecting pipe 1 all with 6 vertical linking to each other of cylindrical shell, smoke-ejecting pipe 1 is arranged on the cylindrical shell on 6 through smoke evacuation base 2; Connecting tube 15 arranges that with smoke-ejecting pipe 1 square crossing spatially connecting tube 15 is communicated with chamber I17, chamber III19 respectively with smoke-ejecting pipe 1; Flange plate 7 links to each other with chamber I17 through connecting tube 15; Be provided with two first hush pipes 8 in the chamber I17, be provided with two second hush pipes 5 in the chamber II18, be provided with the 3rd hush pipe 3 in the chamber III19.First hush pipe 8 and second hush pipe 5 are all axial arranged along cylindrical shell 6, the 3rd hush pipe 3 and first hush pipe 8 and second hush pipe, 5 vertical layouts.The 3rd hush pipe 3 peripheries are provided with fixed plate 9.The cylindrical shell bottom that is positioned at chamber III19 is provided with the pipe 16 that leaks.

First, second is the direct current perforated pipe with the 3rd hush pipe 8,5,3, and wherein, the length of first hush pipe 8 in chamber I17 is 90% ± 5% of chamber I17 length, and the length in chamber II18 is 40% ± 5% of chamber II18 length; Second hush pipe 5 runs through chamber II18; The length of the 3rd hush pipe 3 in chamber III19 is 90% ± 5% of chamber III19 length.

First, second is 25% ± 5% with the punching rate of the 3rd hush pipe 8,5,3, and the hole diameter of first, second and the 3rd hush pipe 8,5,3 is 5mm.

Cylindrical shell 6 is divided into inner barrel and outer cylinder body, and two ends are through end plate 14 sealing, and quieter material is equipped with in the centre of inner barrel and outer cylinder body.

The ingress of first hush pipe, second hush pipe and the 3rd hush pipe 8,5,3 is respectively through first closure plate 11,

second closure plate

10,12 sealings of the 3rd closure plate.

During use; Flange plate 7 is connected outlet pipe; Make the gas of discharge get into chamber I17 through connecting tube 15, gas is got in first hush pipe 8 by the aperture on the perforated pipe, gets into chamber II18 subsequently; Gas among the chamber II18 is got in second hush pipe 5 by the aperture on the perforated pipe, gets into chamber III14 subsequently; Gas among the chamber III14 gets into the 3rd hush pipe 3 by the aperture on the perforated pipe, and last air-flow is discharged by smoke-ejecting pipe 1.Gas is constantly expanded contraction in this a series of action, this structural design has not only improved the air-flow divergence ratio of gas, thereby has increased sound deadening capacity, and has effectively reduced the air-flow regenerated noise.

Each silencer of barrel be combined as the impedance composite noise elimination structure, can lower the basic, normal, high audio-frequency noise of engine exhaust.

Though the above-mentioned accompanying drawing that combines is described the embodiment of the utility model; But be not restriction to the utility model protection domain; One of ordinary skill in the art should be understood that; On the basis of the technological scheme of the utility model, those skilled in the art need not pay various modifications that creative work can make or distortion still in the protection domain of the utility model.

Claims

1. a reactive muffler that is used for engineering machinery comprises flange plate, connecting tube, cylindrical shell, smoke-ejecting pipe, and interior the complying with by preceding through preceding dividing plate and rear bulkhead of said cylindrical shell is divided into chamber I, chamber II, chamber III to back time with cylindrical shell; Said preceding dividing plate is provided with two and is arranged in chamber I and two first hush pipes of chamber II, is provided with two second hush pipes in the chamber II, is provided with the 3rd hush pipe in the chamber III; It is characterized in that; Said first hush pipe and second hush pipe are all axial arranged along cylindrical shell; The 3rd hush pipe arranges with second hush pipe is vertical that with first hush pipe said connecting tube and smoke-ejecting pipe are vertically connected on the cylindrical shell, and connecting tube and smoke-ejecting pipe square crossing spatially layout; Connecting tube is communicated with chamber I, and smoke-ejecting pipe chamber III is communicated with; Said flange plate links to each other with chamber I through connecting tube.

2. the reactive muffler that is used for engineering machinery as claimed in claim 1; It is characterized in that; Said first, second is the direct current perforated pipe with the 3rd hush pipe; Wherein, the length of first hush pipe in chamber I is 90% ± 5% of chamber I length, and the length in chamber II is 40% ± 5% of chamber II length; Second hush pipe runs through chamber II; The length of the 3rd hush pipe in chamber III is 90% ± 5% of chamber III length.

3. the reactive muffler that is used for engineering machinery as claimed in claim 2 is characterized in that, said first, second be 25% ± 5% with the punching rate of the 3rd hush pipe, said first, second be 5mm with hole diameter on the 3rd hush pipe.

4. the reactive muffler that is used for engineering machinery as claimed in claim 1 is characterized in that said cylindrical shell is divided into inner barrel and outer cylinder body, and two ends are through end plate closes, and quieter material is equipped with in the centre of inner barrel and outer cylinder body.

5. the reactive muffler that is used for engineering machinery as claimed in claim 1 is characterized in that, the ingress of said first hush pipe, second hush pipe and the 3rd hush pipe is all sealed through closure plate.