CN208380681U - A kind of Heavy duty gasoline engine exhaust system - Google Patents

Abstract

The utility model discloses a kind of heavy exhaust system of gasoline engine, including exhaust expansion bellows, ternary catalyzing unit, silencer, tailpipe and suspension system, the exhaust expansion bellows, ternary catalyzing unit, silencer and tailpipe are sequentially connected and are equipped with two groups, suspension system is separately positioned in above-mentioned various components, and said modules are fixed；The exhaust expansion bellows include internal layer exhaust elbow and the heat-insulated bend pipe of outer layer；The cavity being arranged successively there are four being set in the silencer, first hush pipe passes through the first cavity, and the second hush pipe passes through third cavity, and third hush pipe passes through third cavity and the 4th cavity, core pipe passes through the second cavity and third cavity, is enclosed with silencing cotton on the outside of the third hush pipe；The hush pipe is equipped with damping hole.The utility model can realize vent gas treatment, and provide higher insertion loss and lower low exhaust back pressure.

Description

A kind of Heavy duty gasoline engine exhaust system

Technical field

The utility model belongs to vehicular engine exhaust system technical field, more particularly to a kind of heavy petrol engine Exhaust system.

Background technique

Tail gas pollution and noise are industrial society's bring byproducts, are had an impact to the psychology and physiology of people, to vehicle The processing of exhaust pollutant and the control of exhaust noise are increasingly harsh, and the domestic research master for being directed to exhaust system of gasoline engine Light duty gas engine is concentrated on, since Heavy duty gasoline engine extraction flow is big, flow velocity is high, exhaust noise is larger, exhaust noise It being difficult to control, and since gasoline engine delivery temperature is higher, needs to be thermally shielded measure, heat shield investment is higher, and development difficulty is big, There are more technological difficulties for Heavy duty gasoline engine exhaust system.

Utility model content

Existing Heavy duty gasoline engine technology there are aiming at the problem that, the utility model can realize vent gas treatment, and provide higher Insertion loss and lower low exhaust back pressure.

The technical solution adopted in the utility model are as follows: a kind of heavy type exhaust system of gasoline engine, including exhaust expansion bellows, Ternary catalyzing unit, silencer, tailpipe and suspension system, the exhaust expansion bellows, ternary catalyzing unit, silencer and exhaust tail Pipe is sequentially connected and is equipped with two groups, and suspension system is separately positioned in above-mentioned various components, and said modules are fixed；It is described Exhaust expansion bellows include internal layer exhaust elbow and the heat-insulated bend pipe of outer layer；The chamber being arranged successively there are four being set in the silencer Body, the first hush pipe pass through the first cavity, and the second hush pipe passes through third cavity, and third hush pipe passes through third cavity and the 4th Cavity, core pipe pass through the second cavity and third cavity, are enclosed with silencing cotton on the outside of the third hush pipe；The hush pipe It is equipped with damping hole.

Further, second cavity is closed cavity.

The beneficial effect that the utility model generates is:

1, discharge meets " GB 14762-2008 " fourth stage discharge standard, and carbon monoxide (CO) test limit value is less than 9.7g/ (KW.h), total hydrocarbon quality (THC) test limit value is less than 0.29 g/ (KW.h), nitrogen oxide mass (NOx) test limit Value is less than 0.7 g/ (KW.h)；

2, dual exhaust system arranges that silencer insertion loss is more than 26dB (A), exhaust back pressure 38Kpa；

3, double-layer thermal-insulation pipe structure, simple and reliable process guarantee that ternary catalyzing unit can be rapidly achieved initiation temperature, change The purifying property of kind cold start-up；

4, ternary catalyzing unit flow field uniformity is more than or equal to 95%, it is ensured that catalyst unit has high service efficiency and makes Use the service life；

5, oxygen concentration in lambda sensor real-time monitoring tail gas, control engine are in chemically correct fuel state, and effectively real When monitor exhaust emissions；

6, there is reliability, meet vehicle 3 years or 180,000 kilometers of requirement.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is double thermal insulation pipe structural schematic diagram；

Fig. 3 is acoustic wave filter structure schematic diagram.

Specific embodiment

In order to which the purpose of this utility model, technical solution and beneficial effect is more clearly understood, below in conjunction with attached drawing and Embodiment is described in further detail the utility model.It should be understood as that specific embodiment described herein is only used to It explains the utility model, is not restricted to the protection scope of the utility model.

As shown in Figure 1, the utility model is a kind of heavy exhaust system of gasoline engine, which includes exhaust expansion bellows 1, ternary catalyzing unit 2, silencer 3, tailpipe 4 and suspension system 5, exhaust expansion bellows 1, ternary catalyzing unit 2,3 and of silencer Tailpipe 4 is sequentially connected and is equipped with two groups.Wherein exhaust expansion bellows 1 guide exhaust airstream, and are thermally shielded heat preservation to air-flow, Air-flow carries out pollutant process by ternary catalyzing unit 2, and then air-flow enters silencer 3 and handles noise, finally by Tailpipe 4 outside discharge tail gas Guide vehicle in atmosphere.The above various components are fixed in suspension system 5.

As shown in Fig. 2, exhaust expansion bellows 1 include internal layer exhaust elbow 11 and the heat-insulated bend pipe 12 of outer layer, air-flow passes through internal layer When exhaust elbow 1, the heat-insulated bend pipe 2 of outer layer can prevent air-flow heat from distributing, it can be achieved that heat-insulation and heat-preservation to air-flow, and two Component is all made of bent tube technique production, and the heat-insulated bend pipe 2 of outer layer cuts open into two parts with laser cutting machine after carrying out bend pipe, then closes It is welded on internal layer exhaust elbow 1.

As shown in figure 3, the silencer 3 in the utility model includes four cavitys being arranged successively, four are equipped in cavity It is each passed through the hush pipe of different cavitys, wherein the first hush pipe 306 is connected with air inlet 301 and passes through the first cavity 302, the Two cavitys 302 are closed cavity, and the second hush pipe 308 passes through third cavity 304, and third hush pipe 309 passes through third cavity 304 With the 4th cavity 305, core pipe 307 passes through the second cavity 303 and third cavity 304, and the end of third hush pipe 309 connects exhaust Mouth 311.Silencing cotton 310 is enclosed on the outside of the intracorporal third hush pipe of the 4th chamber.It is all provided on four above-mentioned hush pipes There is damping hole.Air-flow enters silencer by silencer air inlet 301, passes through the damping hole and outlet on the first hush pipe 306 With the first cavity 302 and the second cavity 303 is entered, closed second cavity 30 is by resonance resolution flowed energy and reduces spy at end Determine band noise, the air-flow in the first cavity 302 by core pipe 307 enter the 4th cavity 05, then by the second hush pipe 308 into Enter third cavity 304, the air-flow in third cavity 304 guides air-flow by there is silencing cotton 310 by third hush pipe 309 Silencer is discharged by exhaust outlet 311 in part processing high band noise, last air-flow.

Claims (2)

1. it is a kind of heavy type exhaust system of gasoline engine, it is characterised in that: including exhaust expansion bellows, ternary catalyzing unit, silencer, Tailpipe and suspension system, the exhaust expansion bellows, ternary catalyzing unit, silencer and tailpipe are sequentially connected and are equipped with two Group, suspension system are separately positioned in above-mentioned various components, said modules are fixed；The exhaust expansion bellows include interior Layer exhaust elbow and the heat-insulated bend pipe of outer layer；It is set in the silencer there are four the cavity being arranged successively, the first hush pipe passes through First cavity, the second hush pipe pass through third cavity, and third hush pipe passes through third cavity and the 4th cavity, and core pipe passes through second Cavity and third cavity, the third hush pipe outside are enclosed with silencing cotton；The hush pipe is equipped with damping hole.

2. a kind of heavy exhaust system of gasoline engine according to claim 1, it is characterised in that: second cavity For closed cavity.