CN212027904U

CN212027904U - Combined type silencer

Info

Publication number: CN212027904U
Application number: CN202020887128.5U
Authority: CN
Inventors: 张士伟; 王菠
Original assignee: Jiujiang University
Current assignee: Jiujiang University
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-11-27
Anticipated expiration: 2030-05-25

Abstract

The utility model discloses a composite muffler, which comprises three cavities which are connected in sequence, namely a first cavity, a second cavity and a third cavity, wherein the adjacent cavities are separated by a support plate; the first chamber is provided with an air inlet pipe, the third chamber is provided with an exhaust pipe, the second chamber is internally provided with a perforated pipe, and two ends of the perforated pipe are respectively positioned in the first chamber and the third chamber; sound-absorbing cotton is arranged around the perforated pipe; the perforated pipe is provided with perforations. Compared with the prior art, the invention aims at the resistive silencer of a certain automobile, and can achieve the aim of silencing by adjusting the axial angles of the air inlet pipe and the exhaust pipe under the condition of not changing the design space of the resistive silencer, thereby reducing the cost and enriching the means for optimally designing the silencing performance of the silencer.

Description

Combined type silencer

Technical Field

The utility model relates to a silencer technical field, concretely relates to combined type silencer.

Background

With the development of economy and the improvement of the living standard of people, automobiles become necessities of every family gradually, and the problem of automobile noise is highlighted. According to statistics, the automobile noise accounts for up to 75% of the environmental noise energy. The automobile silencer is a main means for controlling exhaust noise, so that the research and design of the high-efficiency automobile silencer is particularly necessary, but the existing scheme is often limited by the cost and space of the vehicle, and in addition, along with the emergence of increasingly strict regulations on the noise of the vehicle, the requirement is met, and the design of the silencer with good silencing performance is particularly important in a limited space.

The existing silencer is mostly characterized in that the volume of the silencer is increased, the internal structure of the silencer is optimized, a sub-silencer is additionally arranged, sound absorption materials are widely used, an exhaust system is regulated and controlled, and exhaust radiation noise is reduced, but all the schemes are limited by the cost and the space of a vehicle. Based on the influence of the high-order mode on the transmission loss of the single-cavity expanding type silencer, Eriksson researches the influence of the inlet and outlet bias on the high-order mode propagation of the single-cavity expanding type silencer aiming at the single-cavity expanding type silencer of the four-stroke single-cylinder gasoline engine. For a single-cavity expanding silencer, an inlet pipe is generally a straight pipe, the straight pipe of the inlet pipe is adjusted by Wu and the like to form a proper angle, the silencing quantity reaches 10dB to 40dB at certain specific frequencies, and the silencing performance can be moved from high frequency to low frequency by increasing the pipe diameter of the inlet pipe and the outlet pipe. Aiming at an expansion type simple silencer, an inlet is arranged on the side wall of the silencer, Yi and the like adopt a quadrupole parameter method of a transmission matrix to predict the transmission loss of the silencer, the prediction result is consistent with the test result, and the defect is that the diameter of an inlet pipe arranged on the side wall is far smaller than the diameter of a silencer cavity.

The design schemes of the existing silencers are limited by the cost and the space of a vehicle, and some silencers consider the space limitation, but mostly aim at a single-cavity reactive silencer, and the research on the resistive silencer is very little, so that medium-high frequency noise cannot be effectively controlled.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of current equipment, the utility model provides a combined type silencer realizes the purpose of eliminating the noise through changing the silencer exit angle to design through to the silencer inner structure and make this silencer can eliminate medium and high frequency noise.

The utility model provides a technical scheme that its technical problem adopted is:

a combined muffler comprises three chambers which are sequentially connected, namely a first chamber, a second chamber and a third chamber, wherein adjacent chambers are separated by a support plate;

the first chamber is provided with an air inlet pipe, the third chamber is provided with an exhaust pipe, the second chamber is internally provided with a perforated pipe, and two ends of the perforated pipe are respectively positioned in the first chamber and the third chamber; sound-absorbing cotton is arranged around the perforated pipe; the perforated pipe is provided with perforations.

The air inlet pipe and the exhaust pipe are arranged on the side wall of the corresponding cavity, and an included angle is formed between the air inlet pipe and the exhaust pipe.

The utility model provides a pair of combined type silencer has following beneficial effect:

compared with the prior art, the invention aims at the resistive silencer of a certain automobile, and can achieve the aim of silencing by adjusting the axial angles of the air inlet pipe and the exhaust pipe under the condition of not changing the design space of the resistive silencer, thereby reducing the cost and enriching the means for optimally designing the silencing performance of the silencer.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

fig. 2 is a schematic cross-sectional structure of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, a composite muffler comprises three chambers connected in sequence, namely a first chamber 1, a second chamber 2 and a third chamber 3, wherein adjacent chambers are separated by a support plate 4;

the first chamber 1 is provided with an air inlet pipe 5, the third chamber 3 is provided with an exhaust pipe 6, the second chamber 2 is internally provided with a perforated pipe 7, and two ends of the perforated pipe 7 are respectively positioned in the first chamber 1 and the third chamber 3; sound absorption cotton is arranged around the perforated pipe 7; the perforated pipe 7 is provided with perforations.

As shown in fig. 2, the inlet pipe 5 and the outlet pipe 6 are arranged on the side wall of the corresponding chamber, and an included angle is formed between the inlet pipe 5 and the outlet pipe 6.

The second cavity 2 is provided with a perforated pipe 7, sound-absorbing cotton is arranged around the perforated pipe 7, the air inlet pipe 5 extends into the first cavity 1, air passes through the perforated pipe 7, a part of air enters the second cavity 2 through perforation, a part of air enters the third cavity 3 and then enters the exhaust pipe 6, the perforated pipe 7 of the second cavity 2 and the sound-absorbing cotton mainly reduce medium-high frequency exhaust noise, the air inlet pipe 5 and the exhaust pipe 6 are different from a common silencer and are not led out along the axial line of the cavity of the silencer, but the air inlet pipe 6 and the exhaust pipe 6 are arranged on the side wall of the cavity, and the air inlet pipe 5 and the exhaust pipe 6 which are arranged on the side wall of the.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A combined muffler is characterized by comprising three chambers which are sequentially connected, namely a first chamber (1), a second chamber (2) and a third chamber (3), wherein adjacent chambers are separated by a support plate (4);

the first chamber (1) is provided with an air inlet pipe (5), the third chamber (3) is provided with an exhaust pipe (6), the second chamber (2) is internally provided with a perforated pipe (7), and two ends of the perforated pipe (7) are respectively positioned in the first chamber (1) and the third chamber (3); sound-absorbing cotton is arranged around the perforated pipe (7); the perforated pipe (7) is provided with perforations.

2. A composite muffler according to claim 1, wherein the inlet pipe (5) and the outlet pipe (6) are disposed on the side walls of the respective chambers, and an included angle is formed between the inlet pipe (5) and the outlet pipe (6).