CN202165148U - Silencing exhaust system of car - Google Patents

Abstract

The utility model proposes a car muffler exhaust system, which is composed of a front-stage muffler assembly and a rear-stage muffler assembly. The muffler assembly is composed of the rear intake pipe, the rear muffler and the tail pipe connected in sequence, and the exhaust pipe of the front muffler assembly is connected to the rear intake pipe of the rear muffler assembly; (1) The front muffler is a single chamber (2) The inner chamber of the rear muffler is divided into the first chamber, the second chamber and the third chamber by the radial partition, and each chamber passes through the porous combination on the partition and the middle chamber , The rear muffler pipes are connected to each other; a composite structure with resistance and resistance. The car's muffler exhaust system has large insertion loss and ideal low-frequency muffler effect.

Description

A car muffler exhaust system

technical field

The utility model relates to a muffler exhaust system for a car.

Background technique

The function of the automobile muffler exhaust system is to reduce the exhaust noise. At present, cars usually use a two-stage muffler exhaust system that combines the front-stage muffler assembly and the rear-stage muffler assembly. The front-stage muffler assembly is a resistive structure or a resistive structure, which mainly reduces high-frequency or low-frequency noise; The first-stage muffler is a multi-cavity structure, which is a combination of resistant structure and high-frequency tube structure, which can not only reduce low-frequency noise, but also reduce high-frequency noise. The application of catalytic converters is more conducive to environmental protection, and has been widely used in cars. Noise reduction is a technical public relations item for cars. The structure of this two-stage muffler exhaust system is a method that must be adopted in order to meet the GB1495-2002 automobile noise limit standard.

Contents of the invention

In order to improve the muffler effect of the car's muffler exhaust system and reduce the exhaust back pressure of the system, the invention proposes a car muffler exhaust system.

The technical scheme of the utility model is: a car muffler exhaust system, including a catalytic converter assembly, a front-stage muffler assembly and a rear-stage muffler assembly, and the front-stage muffler assembly includes a front flange, an intake pipe, and a front muffler assembly. , the rear flange of the exhaust pipe is connected in sequence, the rear muffler assembly includes the front flange, the rear intake pipe, the rear muffler, and the tail pipe are connected in sequence, the exhaust pipe of the front muffler assembly is connected to the rear muffler assembly The formed rear-stage air intake pipe is characterized in that: the inside of the front muffler is a single-chamber structure, and the end of the air intake pipe is inserted into the front muffler to form a muffler pipe, and the neck of the muffler pipe is distributed with multiple A small hole, the rear end of the muffler pipe is connected to the exhaust pipe, and the front muffler is formed as a resistant structure.

The improvement to the above scheme is that: the inner cavity of the rear muffler is divided into the first chamber, the second chamber and the third chamber by two partitions; holes to form an exhaust channel; in the rear stage muffler, the end of the front muffler pipe connected with the rear stage intake pipe extends to the end of the second chamber and is provided with a blocking cover. The front muffler pipe is located in the first There are many small holes distributed on the journals in the chamber and the second chamber; the middle muffler is equipped with a middle muffler pipe and runs through the first, second and third chambers, and the middle muffler pipe and the rear muffler pipe pass through A 180° elbow is connected and sealed, and the front end of the rear muffler pipe connected to the tail pipe extends to the first chamber, and is connected and sealed with the 180° elbow, and the rear muffler pipe is located in the second and third chambers. A number of small holes are distributed on the journal in the first chamber, and the outside of the small hole area is covered with a glass fiber sleeve and a high-frequency tube; the first chamber, the second chamber, and the third chamber form a resistant structure , the second chamber and the third chamber also have resistive structures, which together form a composite sound-absorbing structure.

Beneficial effect:

The muffler and exhaust system of the car is equipped with a composite muffler structure combining resistivity and resistance in the front muffler and the rear muffler. The insertion loss is large, and the insertion loss at each speed point under full load is greater than 29dB (A ), up to 38dB(A), it has the characteristics of good noise reduction effect, low exhaust back pressure, and small power loss, especially for low frequency processing.

Description of drawings

Fig. 1 is a front structural schematic view of the utility model.

Fig. 2 is a top view structural diagram of the utility model.

Fig. 3 is a schematic diagram of the assembly of the pre-muffler assembly B of the present invention.

Fig. 4 is a schematic diagram of the external structure of the rear muffler assembly C of the utility model.

Fig. 5 is a schematic diagram of the internal structure of the rear muffler assembly C of the utility model.

Detailed ways

The utility model is shown in Figure 1,2,3,4,5.

A car muffler exhaust system, comprising a catalytic converter assembly A, a front-stage muffler assembly B and a rear-stage muffler assembly C, the front-stage muffler assembly B consists of a front flange 1, an intake pipe 2, a front muffler 3, The exhaust pipe 4 and the rear flange 5 are sequentially connected to form.

Rear-stage muffler assembly C is composed of connecting bolts 6, rear-stage front flange 7, rear-stage intake pipe 8, rear-stage front hook 9, rear-stage muffler 10, rear-stage rear hook 11 and tailpipe 12; The exhaust pipe 4 of the muffler assembly and the intake pipe 8 of the rear-stage muffler assembly are connected through plane flanges 5, 7, and the rear muffler assembly is provided with front and rear hooks 9, 11 connected with the chassis.

The inner cavity of the pre-muffler assembly B is a chamber, and the end of the intake pipe 2 is inserted into the front muffler 3 to form a muffler pipe, and a plurality of small holes are distributed on the journal of the muffler pipe to reduce noise. The rear end of the pipe is connected to the exhaust pipe 4, and the front muffler 3 is formed as a resistant structure.

The inside of the front muffler is a single-chamber structure, the muffler pipe runs through the inside of the front muffler, and the middle surface of the muffler pipe is provided with a plurality of ф8 holes, and the shell and the end cover form an expansion muffler.

As shown in Figure 5, the inner cavity of the rear-stage muffler is divided into the first chamber, the second chamber, and the third chamber by two partitions; there are multiple combined small holes on the partitions to form Exhaust channel.

The inner cavity of the rear-stage muffler is divided into the first chamber, the second chamber and the third chamber by two partitions 13 and 15; multiple combined small holes are opened on the partitions 13 and 15 to form Exhaust channel.

In the rear-stage muffler, the end of the front muffler pipe 12 connected to the rear-stage air intake pipe 8 extends to the end of the second chamber and is sealed with a plug 16. The front muffler pipe 12 is located between the first chamber and the second chamber. There are many small holes distributed on the journal in the second chamber;

The middle muffler pipe 17 of the rear stage muffler runs through the first, second and third chambers, and the muffler pipe 17 and the 180° elbow 22 in the first chamber are connected and sealed; the rear muffler pipe connected with the tail pipe The front end of 21 extends all the way into the first chamber, and is connected and sealed with the 180° elbow 22. The rear muffler pipe 21 is located on the journal of the second and third chambers, and there are many small holes and small hole areas. The outer cover of glass fiber sleeve 20 and high-frequency tube 19; the first chamber, the second chamber, the third chamber form a resistive structure, and the second chamber and the third chamber also have resistive structure together to form a composite sound-absorbing structure.

The performance index of the present utility model is as follows:

①. Air leakage: under the condition of 30kPa, the front muffler assembly is ≤5L/min, and the rear muffler assembly is ≤10L/min.

②. Back pressure: ≤350mbar6000rpm, the measuring point is at the front of the catalytic converter, that is, the back pressure of the exhaust system. The back pressure of the cold end (excluding the catalytic converter) is ≤200mbar6000rpm, and the measuring point is at the front end of the front muffler.

③. Insertion loss: greater than 29dB(A) at all speeds under full load.

④, Acceleration driving noise outside the vehicle: (test method according to GB1495-2002) ≤ 74dB (A).

Claims (2)

1. car exhaust silencer system; Comprise catalytic converter assembly, prime muffler assembly and back level muffler assembly; The prime muffler assembly comprises that forward flange, suction tude, premuffler, outlet pipe rear flange connect formation successively, and back level muffler assembly comprises that forward flange, back level suction tude, back level silencing apparatus, tail pipe connect formation successively, and the outlet pipe of prime muffler assembly connects the back level suction tude of back level muffler assembly; It is characterized in that: described premuffler is inner to be single cavity configuration; The end of suction tude is inserted in the premuffler, forms hush tube, and on the axle journal of hush tube, is distributed with a plurality of apertures; The rear end of the hush tube tracheae that runs in, premuffler forms the resistance structure body.

2. a kind of car exhaust silencer system according to claim 1 is characterized in that: the inner chamber of back level silencing apparatus is divided into first chamber, second chamber, the 3rd chamber by the twice dividing plate; All be provided with a plurality of combination apertures on the twice dividing plate, form the exhaust passage; The preceding hush tube end that in the back level silencing apparatus and back level suction tude is joined extends to second chamber end always, and is provided with blanking cover, and preceding hush tube is positioned on the axle journal of first chamber and second chamber and is distributed with a plurality of apertures; Be provided with middle hush tube and connect first, second and third chamber in the level silencing apparatus of back; Middle hush tube passes through one 180 ° bend pipe connection with the back hush tube and seals; The back hush tube front end that joins with tail pipe extends in first chamber always; Connect and sealing with 180 ° bend pipe, back hush tube is positioned at the outside that is distributed with a plurality of apertures, orifice region on the axle journal of second and third chamber and is with fiber glass coating and high-frequency tube; First chamber, second chamber, the 3rd chamber form resistance structure, in second chamber, the 3rd chamber resistive structure are arranged also, form compound noise elimination structure jointly.

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