CN202732063U - A two-stage muffler exhaust system for a car - Google Patents

Abstract

The utility model provides a car two-stage noise elimination exhaust system, by preceding stage silencer assembly and back stage silencer assembly constitution, preceding stage silencer assembly is linked gradually by intake pipe, preceding stage silencer, blast pipe and constitutes, back stage silencer assembly is linked gradually by back and is formed by back upgrade trachea, back stage silencer, tail pipe, the blast pipe of preceding stage silencer assembly connects the back upgrade trachea of back stage silencer assembly; the pre-stage silencer is of a three-chamber reactive structure; the inner cavity of the rear-stage silencer is divided into a first cavity, a second cavity and a third cavity by a radial partition plate, and the cavities are communicated with each other through a porous combination on the partition plate and a middle silencing pipe and a rear silencing pipe; a composite structure with resistance and resistance. The two-stage silencing exhaust system of the car has large insertion loss and ideal low-frequency silencing effect.

Description

A two-stage muffler exhaust system for a car

technical field

The utility model relates to auto parts, in particular to a two-stage 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 combining the front muffler assembly and the rear muffler assembly, and the front muffler assembly is a resistive structure or an anti Resistant structure, mainly to reduce high-frequency or low-frequency noise; the rear 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 structure of the level muffler exhaust system is a method that must be adopted in order to meet the GB1495-2002 automobile noise limit standard.

Each manufacturer adopts different design schemes for automotive noise limit standards, and the effects of noise reduction and noise reduction are also different due to differences in cost and process schemes.

Contents of the invention

In order to improve the muffler effect of the car's muffler exhaust system and reduce the system's exhaust back pressure, a two-stage muffler exhaust system for cars is proposed.

For this reason, the technical solution of the utility model is: a two-stage muffler exhaust system for a car, which includes a combination of a front-stage muffler and a rear-stage muffler. The rear muffler is composed of a front flange, a rear air intake pipe, a rear muffler, and a tailpipe, and the exhaust pipe of the front muffler is connected to the rear air intake pipe of the rear muffler. It is characterized in that: the front muffler The muffler is a resistant structure, and the inner cavity is three chambers, which are divided into a front muffler pipe, a middle muffler pipe and a rear muffler pipe. The muffler pipe, the rear muffler pipe is connected with the exhaust pipe, and the exhaust pipe runs through to the middle muffler pipe; A plurality of small holes are evenly distributed on the journal in the muffler pipe.

The improvement to the above scheme is that: the inner chamber of the rear-stage muffler is divided into the first chamber, the second chamber and the third chamber by two partitions; there are many combined small holes on the front partition, Form an exhaust passage; in the rear-stage muffler, the end of the muffler pipe connected to the rear-stage intake pipe extends to the end of the second chamber and is sealed with a plug. The muffler pipe is located between the first chamber and the second chamber. There are many small holes distributed on the journal in the two chambers; the middle muffler pipe of the rear stage muffler runs through the first, second and third chambers, and the middle muffler pipe has small holes distributed on the part of the second chamber. Together with the muffler pipe and the rear muffler pipe, it forms a three-tube maze muffler structure; the rear muffler pipe runs through the first, second and third chambers, and there are many small holes distributed on the muffler pipe, and the outer part of the small hole area is covered with Fiberglass sleeve and high-frequency tube; the first chamber, the second chamber, and the third chamber form a resistive structure, and the second chamber and the third chamber are resistive structures, which together form a composite disappearance acoustic structure.

Beneficial effect:

The car's two-stage muffler exhaust system 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 32dB. (A), up to 41dB (A), has the characteristics of good noise reduction effect, low exhaust back pressure, and small power loss, especially for low frequency processing.

In addition to flowing in the three pipes, the airflow in the rear muffler assembly also flows out from these small holes. The air flow is constantly exchanged on the small holes of the three pipes, and part of the sound energy is suppressed, thereby achieving the effect of noise reduction.

Description of drawings

Fig. 1 Schematic diagram of the two-stage muffler exhaust system assembly of the utility model car.

Fig. 2 is an enlarged schematic view of the front muffler of the present invention.

Fig. 3 is a left view of the rear muffler assembly of the utility model.

Fig. 4 is an enlarged schematic diagram of the rear-stage muffler in the rear-stage muffler assembly of the present invention.

Fig. 5 is a cross-sectional view along line A-A of 10 in Fig. 4 .

In the figure, 1 is the front flange, 2 is the front air intake pipe, 3 is the front hook, 4 is the front muffler, 5 is the exhaust pipe, 6 is the rear flange, 7 is the connecting bolt, 8 is the rear front flange, and 9 is the Rear intake pipe, 10 is rear muffler, 11 tailpipe, 12 is rear tail pipe hook, 13 is upper hook of rear stage, 14 is lower hook of rear stage, 14 and 15 are clapboard, 16 is muffler pipe, 17 is the middle muffler tube, 18 is the rear muffler tube, 19 is the high frequency tube, 20 is the glass fiber sleeve, 21 is the blocking cover, 22 is the bell mouth

Detailed ways

As shown in Figure 1, a two-stage muffler exhaust system for a car consists of a front muffler and a rear muffler. The front-stage muffler is composed of front flange 1, front-stage intake pipe 2, front hook 3, front-stage muffler 4, exhaust pipe 5, rear flange 6 and connecting bolt 7; the rear-stage muffler is composed of rear-stage front flange 8. Rear intake pipe 9, rear muffler 10, tail pipe 11, rear tail pipe hook 12, rear upper hook 13 and rear lower hook 14 are sequentially connected; the exhaust pipe 5 of the front muffler assembly and The intake pipe 9 of the rear stage muffler assembly is connected by the rear flange 6 and the front stage 8 of the rear stage.

As shown in Figure 2, the front muffler 4 is a resistant structure, and the inner cavity is three chambers, which are divided into a front muffler pipe, a middle muffler pipe and a rear muffler pipe, wherein the rear of the front stage air intake pipe 2 The end is inserted into the front muffler pipe 4 and penetrates to the middle muffler pipe, the rear muffler pipe is connected to the exhaust pipe 5, and the exhaust pipe 5 runs through to the middle muffler pipe; the front stage intake pipe 2 is muffled at the front A plurality of small holes are evenly distributed on the journal in the pipe, and a plurality of small holes are evenly distributed on the journal in the muffler pipe behind the exhaust pipe 5 .

As shown in Figure 3, the inner cavity of the rear muffler 10 is divided into the first chamber, the second chamber and the third chamber by two partitions 14 and 15; The small holes form the exhaust channels.

In the rear-stage muffler 10, the end of the muffler pipe 16 connected with the rear-stage inlet pipe 9 extends to the end of the second chamber and is sealed with a plug 21. The muffler pipe 16 is located between the first chamber and the second chamber. There are many small holes distributed on the journals in the two chambers; the middle muffler pipe 17 of the rear stage muffler runs through the first, second and third chambers, and forms three pipes together with the muffler pipe 16 and the rear muffler pipe 18 Lost muffler structure; the front end of the rear muffler pipe 18 connected with the tailpipe extends into the first chamber, and a bell mouth 22 is welded at the front end. A plurality of small holes are distributed on the journals of the rear muffler pipe 18 located in the second and third chambers, and the outside of the small hole area is covered with a glass fiber sleeve 20 and a high frequency tube 19 .

The first chamber, the second chamber, and the third chamber form a resistant structure, and the second chamber and the third chamber are resistive structures, which together 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: ≤220mbar@5600rpm, 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 ≤200mbar@5600rpm, and the measuring point is at the front end of the front muffler.

③. Insertion loss: greater than 32dB(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 two-stage exhaust silencer system, comprise that prime silencing apparatus and rear class silencing apparatus are combined into one, the prime silencing apparatus is by the pre-stage air inlet pipe, premuffler, outlet pipe connects formation successively, the rear class silencing apparatus is by forward flange, the rear class suction tude, the rear class silencing apparatus, tail pipe connects formation successively, the outlet pipe of prime silencing apparatus connects the rear class suction tude of rear class muffler assembly, it is characterized in that: described premuffler is resistance structure, inner chamber is three chambers, be divided into front hush tube, middle hush tube and rear hush tube, wherein the rearward end of pre-stage air inlet pipe is inserted in the front hush tube and connects to middle hush tube, rear hush tube is connected outlet pipe, and outlet pipe connects to middle hush tube; Be laid with a plurality of apertures on the axle journal in the pre-stage air inlet Guan Zaiqian hush tube, be laid with a plurality of apertures on the axle journal behind the outlet pipe in the hush tube.

2. a kind of car two-stage exhaust silencer system according to claim 1, it is characterized in that: the inner chamber of rear class silencing apparatus is divided into first chamber, second chamber, the 3rd chamber by the twice dividing plate; Have a plurality of combination apertures on the front dividing plate, form the exhaust passage; In the rear class silencing apparatus, and the hush tube end that the rear class suction tude is joined extends to second chamber end always, and is provided with and shuts blanking cover, and hush tube is positioned on the axle journal of first chamber and second chamber and is distributed with a plurality of apertures; The middle hush tube of rear class silencing apparatus connects first, second and third chamber, and middle hush tube is distributed with aperture in the part of the second chamber, and hush tube, rear hush tube have formed three pipe labyrinth silencer structures together; Rear hush tube connects first, second and third chamber, and the outer cover that is distributed with a plurality of apertures, orifice region on the hush tube has fiber glass coating and high-frequency tube; First chamber, second chamber, the 3rd chamber form resistance structure, are resistive structures in second chamber, the 3rd chamber, jointly form the composite sound damping structure.

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