A kind of double loop exhaust silencer for internal-combustion engine
The utility model belongs to vehicular engine exhaust system technical field, arranges more particularly to a kind of double loop internal combustion engine
For engine in idling or the slow-speed of revolution, for exhaust components based on low frequency, it is similar that exhaust sound has " rub-a-dub rub-a-dub "
The sound beaten a drum, subjective feeling is poor, influences vehicle riding comfort.The silencer of general structure is for exhaust high-frequency noises
Effect is preferable, and low-frequency range erasure effect is poor, designs a broadband, particularly reduces the good silencer change of low-frequency noise effect
It is more more and more urgent.
Utility model content
For existing demand, the utility model possesses preferable low frequency noise elimination energy by design air-flow double back line structure
Power can solve engine under idling or low speed state, and exhaust components low frequency height causes " rub-a-dub rub-a-dub " sound of beating a drum, it is possible to provide
Higher insertion loss, and lower exhaust back pressure can be kept.
The technical solution adopted in the utility model are as follows: a kind of double loop exhaust silencer for internal-combustion engine, in the silencer
If the first hush pipe passes through the first cavity there are four the cavity being arranged successively, the second hush pipe passes through the second cavity, third noise reduction
For pipe across the second cavity and third cavity, the 4th hush pipe passes through third cavity, and the 5th hush pipe passes through the third and fourth cavity,
Silencing cotton is enclosed on the outside of 5th hush pipe；The hush pipe is equipped with damping hole.
Further, separated between the neighboring chambers by partition, be provided with damping hole on the partition.
The beneficial effect that the utility model generates is:
1, gasoline engine and diesel engine exhaust system, silencer insertion loss >=26dB (A) be can be applied to；
2, there is wider noise reduction frequency spectrum, it is preferable particular for 200Hz low-frequency noise erasure effect below.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
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 silencer in the utility model includes four cavitys being arranged successively, five pieces points are equipped in cavity
Not Chuan Guo different cavitys hush pipe, wherein the first hush pipe 106 is connected with air inlet 101 and passes through the first cavity 102, second
Hush pipe 108 passes through the second cavity 103, and third hush pipe 107 passes through the second cavity 103 and third cavity 104, the 4th hush pipe
109 pass through third cavity 104, and the 5th hush pipe 110 passes through third cavity 104 and the 4th cavity 105, the 5th hush pipe 110
End connects exhaust outlet 114.Silencing cotton 113 is enclosed on the outside of the 5th hush pipe in the 4th cavity 105.Above-mentioned four
Damping hole is equipped on a hush pipe.Meanwhile it can be increased according to gas actual flow on the partition between neighboring chambers corresponding
Damping hole, to reduce exhaust back pressure.
Air-flow enters silencer by silencer air inlet 101, passes through damping hole on the first hush pipe 106 and outlet side
With the first cavity 102 and the second cavity 103 is entered, the air-flow in the second cavity 103 enters the first chamber by the second hush pipe 108
Body 102, then air-flow is guided to by third hush pipe 107 by the 4th cavity 105, realize one 360 ° of circuit, the 4th cavity 105
In air-flow third cavity 104 is entered by the 4th hush pipe 109, then guide air-flow by having by the 5th hush pipe 110
The part of silencing cotton 113 handles high band noise, realizes one 360 ° of circuit again, and last air-flow passes through 114 row of exhaust outlet
Silencer out.In the present invention, air-flow realizes two 360 ° of circuit altogether inside silencer, and air-flow stroke is longer, real
The noise elimination pipeline that border is worked is longer, so as to clear up exhaust energy, reduces low-frequency noise.