CN2475836Y

CN2475836Y - Natural gas exhaust silencer for engine

Info

Publication number: CN2475836Y
Application number: CN 01206363
Authority: CN
Inventors: 李朝阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-29
Filing date: 2001-05-29
Publication date: 2002-02-06
Anticipated expiration: 2011-05-29

Abstract

The utility model discloses an exhaust muffler device which is specially used in natural gas engine, which has a muffler arranged at the export end of exhaust pipe, an plate with ordered small pores is fixed in the muffler, and sound absorption material is arranged between the plate and the muffler casing, utilizing the helmholtz resonator principle can decrease acoustic energy, greatly decrease the noise pollution of engine exhaust port, and the detected noise by the environmental protection department of the place in the distance of 1.5 meters from the exhaust port is 72 db, and the noise is decreased to 60 db in the distance of 10 meters from the exhaust port, both of which reach national related standards, therefore noise decreasing effect is very obvious.

Description

The natural gas engine air exhaust muffler device

The utility model relates to a kind of natural gas engine, is also referred to as the CNG motor, relates in particular to a kind of denoising device of CNG motor.

Common natural gas engine does not all have denoising device, what have only is provided with Sound insulating layer and carries out noise reduction around its outlet pipe, but because its noise mainly comes from relief opening, so noise reduction is also not obvious, detect through environmental administration, noise at 1.5 meters of distance relief opening is 102 decibels, noise apart from its 10 meters is 90 decibels, all surpassed relative national standards, formed comparatively severe noise pollution, the noise reduction problem of engine exhaust port is that people thirst for solving and unsolved technical barrier always.

The purpose of this utility model be to provide a kind of be positioned at the natural gas engine relief opening the throat device falls, it can not only reduce the harm of noise to environment effectively, has characteristic of simple structure simultaneously.

The purpose of this utility model is achieved in that

A kind of natural gas engine air exhaust muffler device, it comprises that one is positioned at the silencing apparatus of the outlet end of outlet pipe, wherein, the silencing apparatus internal fixation has the steel plate that has orderly aperture, is provided with sound-absorbing material between steel plate and muffler shell;

Wherein, the utility model preferably scheme be: sound-absorbing material is made up of two-layer different sound-absorbing material;

Wherein, the arrangement of aperture of the present utility model on steel plate can be any one in triangle, rectangle and the square.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is a structural representation of the present utility model.

A kind of natural gas engine air exhaust muffler device, it comprises that one is positioned at the silencing apparatus 8 of the outlet end of outlet pipe 3, wherein, silencing apparatus 8 internal fixation have the steel plate 5 that has orderly aperture 6, are provided with sound-absorbing material 7 between the shell 9 of steel plate 5 and silencing apparatus 8; This sound-absorbing material 7 is made up of two-layer different sound-absorbing material, and they are respectively the tender rotary glass silk flosses of rock that is provided by Chengdu special refractories factory, and aperture 6 is square arrangement.

The utility model is provided with denoising device because of the relief opening at natural gas engine 1, utilize conspicuous female Huo Zi resonator principle to reduce acoustic energy, thereby can reduce noise pollution greatly, detect through environmental administration, at 1.5 meters noises of distance relief opening is 72 decibels, apart from its 10 meters noises is 60 decibels, and it is fairly obvious to fall the throat effect, has also reached NBS simultaneously; In addition, can find out obviously that the utility model shows the foolproof advantage of structure.

Claims

1, a kind of natural gas engine air exhaust muffler device, comprise that one is positioned at the silencing apparatus (8) of the outlet end of outlet pipe (3), it is characterized in that the steel plate (5) that has orderly aperture (6) being arranged, between steel plate (5) and muffler shell (9), be provided with sound-absorbing material (7) at silencing apparatus (8) internal fixation.

2, natural gas engine air exhaust muffler device according to claim 1 is characterized in that sound-absorbing material (7) is made up of two-layer different sound-absorbing material.

3, natural gas engine air exhaust muffler device according to claim 1 is characterized in that the arrangement of aperture (6) on steel plate (5) can be any one in triangle, rectangle and the square.