CN212563384U

CN212563384U - Noise silencer

Info

Publication number: CN212563384U
Application number: CN201920543070.XU
Authority: CN
Inventors: 严才宝; 刘健; 周帅利; 印仁军
Original assignee: Shanghai Tenneco Exhaust System Co Ltd
Current assignee: Shanghai Tenneco Exhaust System Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2021-02-19
Anticipated expiration: 2029-04-19

Abstract

A muffler comprising a housing, a first end cap, a second end cap, first and second perforated plates spaced apart between the first and second end caps, an inlet pipe passing through the first and second perforated plates and exposed on the first end cap, and an outlet pipe passing through the first and second perforated plates and exposed on the second end cap; the first and second perforated plates divide the muffler into a first cavity between the first end cap and the first perforated plate, a second cavity between the first and second perforated plates, and a third cavity between the second perforated plate and the second end cap; the muffler further includes a porous material covering one or both sides of the second perforated plate. So set up for simple structure just can realize reducing the noise.

Description

Noise silencer

Technical Field

The utility model relates to a silencer belongs to engine exhaust system technical field.

Background

In a conventional muffler, in order to solve the problem of high frequency noise such as airflow, a sound-deadening cotton is usually added in a cavity of the muffler. The main mechanism of the silencing cotton for reducing high-frequency noise is as follows: when the sound waves are transmitted to the gaps, the sound waves continuously rub with air in the gaps so as to be attenuated continuously, and therefore the purpose of reducing the noise, particularly the medium-high frequency noise is achieved. The higher the frequency is, the more violent the particle vibration is, and the more severe the sound wave attenuation is, so the silencing cotton generally has relatively better silencing effect on middle and high frequency noise. However, the following problems may occur in the arrangement of the noise damping cotton:

(1) the silencing cotton is coated with a large amount of wetting agents, so that harmful substances are easily volatilized, and the requirement of higher emission regulations is difficult to meet.

(2) The fixing of the silencing cotton is a difficult problem, and the silencing cotton is easily blown out by airflow after a long time.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure just can realize the silencer of noise reduction.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a muffler comprising a housing, a first end cap, a second end cap, first and second perforated plates spaced apart between the first and second end caps, an inlet pipe passing through the first and second perforated plates and exposed on the first end cap, and an outlet pipe passing through the first and second perforated plates and exposed on the second end cap; the first and second perforated plates divide the muffler into a first cavity between the first end cap and the first perforated plate, a second cavity between the first and second perforated plates, and a third cavity between the second perforated plate and the second end cap; the muffler further includes a porous material covering one or both sides of the second perforated plate.

As a further improved technical proposal of the utility model, the porous material is steel wool or a porous metal plate.

As the utility model discloses further modified technical scheme, porous material welded fastening is in one side or both sides of second perforated plate.

As a further improved technical solution of the present invention, the muffler does not have a sound-deadening cotton located in the first cavity, the second cavity or the third cavity.

As a further improved technical scheme of the utility model, the entry pipe erects on the first perforated plate and extend into in the second cavity.

As a further improved technical scheme of the utility model, the export pipe erects first perforated plate and on the second perforated plate, the one end of outlet pipe extends into in the first cavity.

Compared with the prior art, the utility model discloses a set up the cover and be in the porous material of one side or both sides of second perforated plate for simple structure just can realize reducing the noise.

Drawings

Fig. 1 is a schematic view of the muffler of the present invention.

Fig. 2 is a schematic sectional view taken along line a-a of fig. 1, and shows the airflow and the sound wave as they pass through.

Detailed Description

Referring to fig. 1 and 2, the present invention discloses a muffler, which includes a housing 10, a first end cap 11, a second end cap 12, a first perforated plate 13 and a second perforated plate 14 spaced apart from each other between the first end cap 11 and the second end cap 12, an inlet pipe 15 passing through the first perforated plate 13 and the second perforated plate 14 and exposed on the first end cap 11, and an outlet pipe 16 passing through the first perforated plate 13 and the second perforated plate 14 and exposed on the second end cap 12. The first perforated plate 13 and the second perforated plate 14 divide the muffler into a first cavity 21 between the first end cap 11 and the first perforated plate 13, a second cavity 22 between the first perforated plate 13 and the second perforated plate 14, and a third cavity 23 between the second perforated plate 14 and the second end cap 12.

The inlet pipe 15 is spanned over the first perforated plate 13 and extends into the second chamber 22.

The outlet pipe 16 is spanned over the first perforated plate 13 and the second perforated plate 14. One end of the outlet tube 16 extends into the first chamber 21.

The muffler further comprises a porous material 17 covering one or both sides of the second perforated plate 14. Preferably, said porous material 17 is welded and fixed to said second perforated plate 14. So set up, simplified the structure. The porous material 17 is steel wool, a porous metal plate or other materials with multiple holes and integrally formed.

The muffler does not have sound-deadening cotton in the first cavity 21, the second cavity 22, or the third cavity 33. In particular, the inlet pipe 15 and the outlet pipe 16 of the muffler do not have sound-deadening cotton located in the first cavity 21, the second cavity 22, or the third cavity 33.

The utility model discloses the noise elimination function of silencer is as follows: when the gas flow (indicated with the solid arrows in fig. 2) enters the second chamber 22 from the inlet duct 15, the majority of the gas flow, blocked by the second perforated plate 14 and by the porous material 17, passes in reverse through the first perforated plate 13 into the first chamber 21; the gas flow then enters the outlet pipe 16 and finally exits the muffler. When sound waves (see dashed arrows in fig. 2) are transmitted through the inlet pipe 15 into the second chamber 22, part of the sound waves are transmitted through the second perforated plate 14 into the porous material 17. Since the pore gaps of the porous material 17 can be made very small, an infinite number of porous gaps can be formed, and when sound waves are transmitted into the gaps, the sound waves are continuously attenuated by continuously rubbing with air in the gaps, so that the purpose of reducing noise, particularly medium-high frequency noise, is achieved. The higher the frequency, the more intense the particle vibration and the more strongly the sound wave is attenuated.

Compared with the prior art, the utility model discloses a silencer is through removing the noise elimination cotton, with the cover the porous material 17 of one side or both sides of second perforated plate 14 replaces, has further simplified the structure, has improved the durability of product.

The above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the understanding of the present specification should be based on the technical personnel in the technical field, and although the present specification has described the present invention in detail with reference to the above embodiments, the skilled personnel in the art should understand that the technical personnel in the technical field can still modify or substitute the present invention, and all the technical solutions and modifications thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A muffler comprising a housing, a first end cap, a second end cap, first and second perforated plates spaced apart between the first and second end caps, an inlet pipe passing through the first and second perforated plates and exposed on the first end cap, and an outlet pipe passing through the first and second perforated plates and exposed on the second end cap; the first and second perforated plates divide the muffler into a first cavity between the first end cap and the first perforated plate, a second cavity between the first and second perforated plates, and a third cavity between the second perforated plate and the second end cap; the silencer is characterized by further comprising a porous material covering one side or two sides of the second perforated plate, and the porous material is fixed on the second perforated plate in a welded mode.

2. The muffler of claim 1, wherein: the porous material is steel wool or a porous metal plate.

3. The muffler of claim 1, wherein: the muffler does not have sound-deadening cotton located in the first cavity, the second cavity, or the third cavity.

4. The muffler of claim 1, wherein: the inlet pipe is erected on the first perforated plate and extends into the second cavity.

5. The muffler of claim 1, wherein: the outlet pipe support is established first perforated plate and on the second perforated plate, the one end of outlet pipe extends into in the first cavity.