CN114087059B

CN114087059B - Silencer suitable for high air speed

Info

Publication number: CN114087059B
Application number: CN202111486644.2A
Authority: CN
Inventors: 王家华; 董善燕; 刘永亮; 张中刚
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2021-12-07
Filing date: 2021-12-07
Publication date: 2023-03-07
Anticipated expiration: 2041-12-07
Also published as: CN114087059A

Abstract

The invention relates to a silencer suitable for high airflow speed, which comprises a shell with two closed ends, a first pipeline, a second pipeline and a partition board, wherein the two closed ends of the shell are connected with the first pipeline and the second pipeline respectively; the partition board is arranged in the shell and divides the shell into corresponding chambers; the first pipeline penetrates into the shell from the left end cover of the shell, and the port of the first pipeline is positioned in the cavity between the right end cover and the partition plate after penetrating through the partition plate; the second pipeline penetrates into the shell from the right end cover of the shell, and the port of the second pipeline is positioned in the cavity between the left end cover and the partition plate after penetrating through the partition plate; and a first flaring section is arranged at a port of the first pipeline, and a second flaring section is arranged at a port of the second pipeline. Compared with a common silencer, the scheme adopts the flaring pipe section, so that the air flow speed is reduced twice, the sudden change of the air flow speed is reduced, the air flow speed at the section sudden change position is reduced, the air friction noise can be effectively reduced, and the edge noise of the pipe orifice can be effectively prevented.

Description

Silencer suitable for high air velocity

Technical Field

The invention belongs to the technical field of silencers, and particularly relates to a silencer suitable for high air velocity.

Background

Vehicle mufflers often consider the ability to attenuate noise energy to evaluate muffler performance. However, in some cases, for example, in some compact vehicle models, the silencer has to be made very small, and in order to obtain good silencing performance, the diameter of the exhaust pipeline has to be made very small, and although the attenuation of sound energy is large, the thinner exhaust pipeline can bring about a larger air flow velocity at the same time, so that the friction between the exhaust gas and the pipeline edge can be caused to generate noise.

Fig. 1 is an automobile-used exhaust silencer that present common motorcycle type used, including outside barrel a, air inlet pipe way B, gas outlet pipe way D, first inside baffle C1 and second inside baffle C2, these conventional noise reduction structures can realize subduing to the exhaust noise. However, at high engine speeds, and at high airflow velocities, for example, above mach 0.25, significant airflow friction noise and nozzle edge noise are generated. Therefore, some mufflers adopt a bimodal structure, a valve structure is welded at the tail end of a pipeline, the pipeline is communicated with an internal cavity of the muffler, when the air flow speed is not high, the valve cannot be opened, and tail gas can only pass through the pipeline. When the air flow speed is high, the valve is opened under the action of pressure, the air flow passes through the air flow at the same time, so that the cross-sectional area of the air flow is increased, the air flow speed is reduced, and the generation of friction noise is restrained.

The silencer with the bimodal structure can only deal with noise in a low airflow state, and fluid friction noise is easily generated under high airflow. In order to reduce the friction noise, the diameters of the inlet and outlet pipelines and the internal pipeline of the silencer must be increased, the cross section area of the silencer must be increased in order to prevent the silencing performance from being lost, the volume of the silencer is increased, and the cost is increased. In addition, the bimodal muffler with the valve has the advantages that the cost is increased due to the addition of the valve structure, the requirement on the high-temperature resistance of the spring is high, and clamping stagnation and abnormal sound are generated even after the bimodal muffler is used for a long time.

Disclosure of Invention

The invention aims to provide a silencer suitable for high airflow speed so as to solve the problem that fluid friction noise is easy to generate under high airflow.

In order to achieve the purpose, the application is realized through the following technical scheme:

a muffler suitable for high airflow speed comprises a shell with two closed ends, a first pipeline, a second pipeline and a partition board;

the partition plate is arranged in the shell and divides the shell into at least corresponding chambers;

the first pipeline penetrates into the shell from the left end cover of the shell, and the port of the first pipeline is positioned in a cavity between the right end cover of the shell and the partition plate after penetrating through the partition plate;

the second pipeline penetrates into the shell from the right end cover of the shell, and the port of the second pipeline is positioned in the cavity between the left end cover of the shell and the partition plate after penetrating through the partition plate;

and a first flaring section is arranged at a port of the first pipeline, and a second flaring section is arranged at a port of the second pipeline.

Further, the baffle is two, is first baffle and second baffle respectively, and first baffle is the trompil board that is provided with a plurality of trompils with the second baffle, first flaring section is located between the right-hand member lid of second baffle and casing, the second flaring section is located between the left end lid of first baffle and casing.

Furthermore, a plurality of openings are formed in the first pipeline between the first partition plate and the second partition plate.

Furthermore, a diameter expanding part is arranged on the second pipeline between the first partition plate and the second partition plate, and the inner diameter of the diameter expanding part is smaller than that of the second flaring section.

Furthermore, the connection part of the port of the first pipeline and the first flaring section is not provided with a gradually-changed pipe diameter, and the connection part of the port of the second pipeline and the second flaring section is not provided with a gradually-changed pipe diameter, so that the sudden change of the section is realized.

Furthermore, a third flaring section is additionally arranged at the other end of the second pipeline, the third flaring section comprises a second flange, a transition pipe section and an expansion pipe section, and the second pipeline is connected with the second flange of the third flaring section through the first flange on the second pipeline.

Further, the axial centerline of the expanded tubular section is curvilinear.

The invention has the beneficial effects that:

1) Compared with a common silencer, the scheme adopts the flaring pipe section, so that the air flow speed is reduced twice, the sudden change of the air flow speed is reduced, the air flow speed at the section sudden change position is reduced, the air friction noise can be effectively reduced, and the edge noise of the pipe orifice can be effectively prevented.

2) The silencer adopts the flaring pipe section to replace a valve, has simple and reliable structure and low cost, and can also achieve the effect of reducing the friction noise of high-speed airflow.

3) The scheme can also select to additionally install a flared pipe section at the tail part of the silencer, and flexible noise reduction measures can be implemented.

Drawings

FIG. 1 is a schematic view of an existing exhaust muffler;

FIG. 2 is a schematic view of a muffler assembly according to the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 with the housing removed;

fig. 4 is a front view of fig. 3.

Description of the reference numerals

A-an outer cylinder, B-an air inlet pipeline, C1-a first inner partition, C2-a second inner partition, D-an air outlet pipeline, 1-a shell, 2-a first pipeline, 3-a second pipeline, 4-a first partition, 5-a second partition, 6-a first chamber, 7-a second chamber, 8-a third chamber, 9-a first flaring section, 10-a second flaring section, 11-a left end cover of the shell, 12-a right end cover of the shell, 13-an opening, 14-a flaring part and 15-a first flange.

Detailed Description

The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.

As shown in fig. 2 to 4, the present application provides a muffler suitable for high airflow velocity, which includes a housing 1 with two closed ends, a first pipeline 2, a second pipeline 3, a first partition plate 4, and a second partition plate 5. The whole of the casing of this application is oval venturi tube, and the left end of oval venturi tube is the left end lid 11 of casing, and the right-hand member is the right-hand member lid 12 of casing. In the technical scheme of this application, there is not clear and definite requirement to the concrete shape of casing, in-service use to can be with the spatial structure phase-match of the reservation position of vehicle as the standard.

The first partition plate and the second partition plate are arranged in the shell, in the embodiment, the first partition plate and the second partition plate are the same in structure and are perforated plates provided with a plurality of holes. Thus, the two partitions separate the housing into a first chamber 6, a second chamber 7 and a third chamber 8.

The left end of first pipeline 2 passes through the flange and is connected with engine exhaust pipe, the right-hand member of first pipeline passes left end lid 11, first baffle 4 and second baffle 5 of casing, the right-hand member opening stretches into third chamber 8, the casing is by the space between the right-hand member lid of second baffle and casing promptly, set up first flaring section 9 in the port department of first pipeline, in this embodiment, the port department joint part of first flaring section and first pipeline is not provided with the variable pipe diameter structure, in order to realize the cross-section sudden change, improve the noise reduction effect of air current friction noise. A plurality of apertures 13 are provided in the portion of the first conduit within the second chamber.

The right end of the second pipeline 3 is provided with a first flange 15, the left end of the second pipeline penetrates into the shell from a right end cover 12 of the shell and respectively penetrates through the second partition plate 5 and the first partition plate 4, the port of the second pipeline is positioned in the first cavity 6, a second flaring section 10 is arranged at the port of the second pipeline, in the embodiment, the connecting part of the second flaring section and the port of the second pipeline is not provided with a pipe diameter changing structure so as to realize section mutation and improve the noise reduction effect of airflow friction noise, a diameter expanding part 14 is arranged at the part of the second pipeline positioned in the second cavity, and the inner diameter of the diameter expanding part is smaller than that of the second flaring section.

This application has welded the flaring section through the port department at first pipeline and second pipeline, can effectively increase the cross-sectional area that the gas flow entered or exited the cavity, has effectively reduced the velocity of flow that gaseous is close to the pipeline section at the cavity to pipeline friction noise has been reduced. The original first pipeline and the original second pipeline have primary section change at the flaring section to generate primary noise elimination effect, the section of the outlet of the flaring section is changed again to generate secondary noise elimination effect, and the noise energy loss is related to the section ratio of the section mutation position, so that the total noise elimination effect related to the section ratio of the section mutation position is unchanged from the original state, and the airflow friction noise is effectively reduced.

Meanwhile, the first flaring section and the second flaring section respectively reduce the air flow speed mutation degree at the section mutation position twice at the first pipeline port, the second pipeline port, the first flaring section outlet and the second flaring section outlet, and effectively prevent the edge noise.

And a third flaring section is additionally arranged at the other end of the second pipeline, the third flaring section comprises a second flange, a transition pipe section and an expansion pipe section, the second pipeline is connected with the second flange of the third flaring section through the first flange on the second pipeline, and the axial center line of the expansion pipe section is a curve so as to further eliminate the friction noise generated by the high-speed airflow.

Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A muffler suitable for high airflow speed comprises a shell with two closed ends, a first pipeline, a second pipeline and a partition board;

the first pipeline penetrates into the shell from the left end cover of the shell, and a port of the first pipeline is positioned in a cavity between the partition board and the right end cover of the shell after penetrating through the partition board;

the second pipeline penetrates into the shell from the right end cover of the shell, and the port of the second pipeline is positioned in the cavity between the partition board and the left end cover after penetrating through the partition board; it is characterized in that the preparation method is characterized in that,

a first flaring section is arranged at a port of the first pipeline, and a second flaring section is arranged at a port of the second pipeline;

the two partition plates are respectively a first partition plate and a second partition plate, and the first partition plate and the second partition plate are perforated plates provided with a plurality of holes;

an expanding part is arranged on the second pipeline between the first partition plate and the second partition plate, and the inner diameter of the expanding part is smaller than that of the second flaring section;

the connection part of the port of the first pipeline and the first flaring section is not provided with a gradual change pipe diameter, and the connection part of the port of the second pipeline and the second flaring section is not provided with a gradual change pipe diameter, so that the sudden change of the section is realized;

the first flaring section is positioned between the second partition plate and the right end cover of the shell, and the second flaring section is positioned between the first partition plate and the left end cover of the shell;

a plurality of openings are formed in the first pipeline between the first partition plate and the second partition plate;

and a third flaring section is additionally arranged at the other end of the second pipeline, the third flaring section comprises a second flange, a transition pipe section and an expansion pipe section, and the second pipeline is connected with the second flange of the third flaring section through the first flange on the second pipeline.

2. A muffler adapted for high gas flow rates as claimed in claim 1, wherein the axial centerline of the diverging pipe section is curvilinear.