CN102865125B

CN102865125B - Automobile muffler

Info

Publication number: CN102865125B
Application number: CN201210160996.3A
Authority: CN
Inventors: 廖平魁; 郑杰
Original assignee: LIUZHOU LIHE EXHAUST CONTROL SYSTEM CO Ltd
Current assignee: LIUZHOU HENGZHUO AUTO PARTS CO., LTD.
Priority date: 2012-05-23
Filing date: 2012-05-23
Publication date: 2015-05-20
Anticipated expiration: 2032-05-23
Also published as: CN102865125A

Abstract

The invention discloses an automobile muffler, which comprises a shell, an air inlet pipe and an air outlet pipe, wherein the internal space of the shell is partitioned into a first cavity, a second cavity and a third cavity along an air inlet direction through a front perforated separation disc and a back perforated separation disc; the air inlet pipe and the air outlet pipe are arranged on the shell; the back separation disc is used for enclosing the inner end of the air inlet pipe; the pipe walls of the air inlet pipe in the first cavity and the second cavity are respectively distributed with a plurality of through holes; a part of the air outlet pipe in the shell is formed by connecting an air outlet section part which passes through the third cavity and the second cavity in sequence from the air outlet, a U-shaped pipe section part in the first cavity, and an air inlet section part passing through the second cavity; a plurality of muffling through holes are distributed in the pipe wall of the air outlet section of the air outlet pipe in the second cavity, and a jacket for enclosing the muffling through holes is arranged outside the pipe wall; and muffling cotton is arranged between the air outlet pipe and the jacket. Compared with the prior art, the automobile muffler has the advantages that the high and low-frequency noise is better attenuated, and the total noise is lowered by 2 decibels, from 73 decibels to 71 decibels.

Description

Automotive muffler

Technical field

The present invention relates to field of automobile, especially a kind of silencing apparatus polluted for reducing engine exhaust noise.

Background technique

This silencing apparatus is as the critical component reducing automobile engine to exhaust noise, and it carrys out stress release treatment by reducing, decaying exhaust gas pulses pressure; A kind of technological scheme of mini van silencing apparatus is had to be: to include a housing, fill suction tude on the housing and steam outlet pipe, described housing by before with holes every dish and after every dish inner space to be divided along airintake direction and is separated with first and second and the 3rd chamber, described suction tude and described steam outlet pipe all through before described in housing every dish and described after every dish, described suction tude and described steam outlet pipe are equipped with through hole on the tube wall of described second chamber.

This technological scheme automotive muffler in use finds that there is following deficiency: the soundproof effect of soundproof effect particularly high frequency noise is good still not.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of automotive muffler of engine exhaust noise of decaying well.

The technological scheme that technical solution problem of the present invention adopts is: this automotive muffler, include by before with holes every dish and after divide inner space the housing being separated with the first chamber and the second chamber and the 3rd chamber every dish along airintake direction, fill suction tude on the housing and steam outlet pipe, close the inner of described suction tude after described every disk seal, the tube wall of described suction tude in described first chamber and described second chamber is distributed with multiple through hole; The part of described steam outlet pipe in described housing by the air outlet section part from air outlet successively through described 3rd chamber and described second chamber, " U-shaped " pipeline section part in described first chamber, the air inlet section part through described second chamber connects and composes; The air outlet section of the described steam outlet pipe tube wall in described second chamber is distributed with multiple noise reduction through hole, is provided with the overcoat of these noise reduction through holes closed outside this tube wall, between described steam outlet pipe and described overcoat, silencing cotton is housed.

In above-mentioned automotive muffler technological scheme, technological scheme can also be more specifically: described housing is connected and composed by cylindrical shell and front cover and rear end cover; The multilayer steel plates that described cylindrical shell is connected by head and the tail limit is formed, and is preferably surrounded by two-layered steel plates overlap, and the connection on its head and the tail limit is the connection that one of them side is nipped in another groove of being formed of bending side; The connection of described cylindrical shell and described front cover and described rear end cover is all connections of curling bending; Described silencing cotton is glass fibre.

Owing to have employed technique scheme, the present invention compared with prior art, the beneficial effect had is: the suction tude of subsection-inlet and the combination of " U-shaped " steam outlet pipe, and impel waste gas reflection repeatedly and collision in each chamber, in constantly expanding, cooling reduces its fluctuation pressure gradually; The silencing cotton being contained in pipeline section of giving vent to anger can absorb the high-frequency sound energy of waste gas, and the structure of double-layer barrel can reduce radiated noise effectively; It can be decayed engine exhaust noise well, and global noise reduces 2 decibels, reduces to 71 decibels by original 73 decibels.

Accompanying drawing explanation

Fig. 1 is the plan view of the embodiment of the present invention.

Fig. 2 is the sectional view at A-A place in Fig. 1.

Fig. 3 is the sectional view at B-B place in Fig. 1.

Fig. 4 is the partial enlarged drawing at I place in Fig. 1.

Fig. 5 is the cylindrical shell longitudinal joint connection diagram of the embodiment of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described:

Automotive muffler as shown in Figure 1, Figure 2, Figure 3 shows has a housing all using crimping to connect by cylindrical shell 8 and the connection between front cover 1 and rear end cover 5; Cylindrical shell 8 is surrounded by two-layer steel plate overlap, and as shown in Figure 4, the connection longitudinal joint of cylindrical shell 8 adopts undercut to surround, and namely the first limit of steel plate sheet material and trailing edge are the connections that one of them side is nipped in groove that another bending side formed, as shown in Figure 5.In housing by before with holes every dish 2 and after to weld with cylindrical shell 8 inner space to divide successively along airintake direction every dish 7 and be separated with first and second and the 3rd chamber; Weld the suction tude 9 that is stretched into enclosure interior in the front end of housing, after close the inner of suction tude 9 every dish 7 and weld with it, the tube wall of suction tude 9 in first, second chamber is distributed with multiple through hole; The steam outlet pipe 5 that one is stretched into enclosure interior is welded in the rear end of housing, the part of steam outlet pipe 5 in housing, by the air outlet section part from air outlet successively through the 3rd chamber and the second chamber, " U-shaped " pipeline section part in described first chamber, to connect and compose through the air inlet section part of the second chamber; Steam outlet pipe 5 is distributed with multiple noise reduction through hole on the tube wall of the second chamber, is provided with the overcoat 3 of these noise reduction through holes closed outside this tube wall, and glass fibre continuous yarn is housed between steam outlet pipe 5 and overcoat 3.

Due to the subsection-inlet of suction tude at first, second chamber and the steam outlet pipe of " U-shaped ", impel waste gas reflection repeatedly and collision in each chamber, in constantly expanding, cooling reduces its fluctuation pressure gradually; Cylindrical shell 8 is consisted of optimum choice double-layer plate, and more effectively can reduce radiated noise, silencing cotton 4 sponges part high-frequency sound energy; Global noise reduces 2 decibels, reduces to 71 decibels by original 73 decibels.

Claims

1. an automotive muffler, include by before with holes every dish (2) and after inner space is divided every coiling (7) housing being separated with the first chamber and the second chamber and the 3rd chamber along airintake direction, fill suction tude (9) on the housing and steam outlet pipe (5), it is characterized in that: the inner closing described suction tude (9) after described every dish (7), the tube wall of described suction tude (9) in described first chamber and described second chamber is distributed with multiple through hole; The part of described steam outlet pipe (5) in described housing is by the air outlet section part of passing described 3rd chamber and described second chamber from air outlet successively, " U-shaped " pipeline section part in described first chamber, the air inlet section part through described second chamber connects and composes; The air outlet section of described steam outlet pipe (5) tube wall in described second chamber is distributed with multiple noise reduction through hole, is provided with the overcoat (3) of these noise reduction through holes closed outside this tube wall, silencing cotton (4) is housed between described steam outlet pipe (5) and described overcoat (3).

2. automotive muffler according to claim 1, is characterized in that: described housing is connected and composed by cylindrical shell (8) and front cover (1) and rear end cover (6); The multilayer steel plates that described cylindrical shell (8) is connected by head and the tail limit is formed, and the connection on its head and the tail limit is connection, described cylindrical shell (8) and described front cover that one of them side is nipped in another groove of being formed of bending side

(1) and the connection of described rear end cover (6) are all connections of curling bending.

3. automotive muffler according to claim 2, is characterized in that: described cylindrical shell (8) is surrounded by two-layered steel plates overlap.

4. automotive muffler according to claim 1 and 2, is characterized in that: described silencing cotton (4) is glass fibre.

5. automotive muffler according to claim 3, is characterized in that: described silencing cotton (4) is glass fibre.