CN204175364U - A kind of circular automobile exhaust gas Sound Attenuator - Google Patents

Abstract

The utility model discloses a kind of circular automobile exhaust gas Sound Attenuator, it is characterized in that, front cover and rear end cover is occluding with respectively at the two ends of circular cylinder body, front dividing plate and rear bulkhead are by the internal layout of circular cylinder body, air inlet expanding duct is located at the top between front cover and front dividing plate, catalyst converter is located between front dividing plate and rear bulkhead, and the intermediate portion between rear end cover and rear bulkhead is provided with diffusing tube of giving vent to anger, between the outer wall and the inwall of circular cylinder body of diffusing tube of giving vent to anger, be filled with glass fibre.By above setting, the utility model maintains the effective advantage of centering, low frequency silencing noise, and air-flow is by repeatedly turning to the noise elimination to high frequency, engine supercharger whistle is well eliminated, low-frequency noise is well solved, and diffusing tube pipe of giving vent to anger adopts straight tube structure, also eliminate a part of exhaust sound while the exhaust back pressure of whole system is reduced, in actual entrucking uses, obtain good effect.

Description

A circular vehicle exhaust silencer

technical field

The utility model belongs to an engine exhaust muffler box, in particular to a circular vehicle exhaust muffler box used for reducing engine exhaust noise and lowering the exhaust back pressure of the whole system. the

Background technique

At present, the existing engine exhaust muffler mainly adopts the resistant exhaust muffler structure of pipe cross-section expansion and cross-section contraction, and uses the sound wave to reflect back to the sound source due to the change of the acoustic reactance at the sudden change in the cross-section, so as to achieve The purpose of silencer. This resistant exhaust muffler box has a certain effect on middle and low frequency noise silencing. Due to the small number of perforated pipe sections and perforated plates that have a good sound-absorbing effect on high-frequency noise, and there is no resistive sound-absorbing material that has a good sound-absorbing effect on high-frequency noise inside, its sound-absorbing effect on high-frequency noise It is not ideal, and the relatively unreasonable structural design leads to high exhaust back pressure. the

Utility model content

The purpose of the utility model is to provide an impedance compound type vehicle exhaust muffler box with good muffler effect in the whole frequency range, especially in the low frequency band. the

In order to achieve the above object, the utility model has a front end cover and a rear end cover respectively engaged at both ends of the circular cylinder, and the front partition and the rear partition separate the interior of the circular cylinder, and at the lower part of the front partition There are a plurality of circular ventilation holes, and an outlet diffuser installation hole is provided in the middle of the rear partition, a plurality of strip-shaped ventilation holes are arranged around the installation hole of the outlet diffuser, and an intake expansion pipe is arranged at the front end The upper part between the cover and the front bulkhead, the outer end of the air intake expansion pipe is open, the other end is closed by the front bulkhead, the catalytic converter is arranged between the front bulkhead and the rear bulkhead, and the rear end cover and the rear bulkhead The middle part between the plates is provided with an air outlet diffuser pipe, the outer end of which is open and the other end is closed, and glass fiber is filled between the outer wall of the air outlet diffuser pipe and the inner wall of the circular cylinder. the

Through the above settings, the utility model maintains the advantages of good noise reduction effect on medium and low frequency noise, and the airflow passes through multiple turns to eliminate high frequency noise, so that the whistle of the engine supercharger is well eliminated, and the low frequency The noise is well resolved, and the outlet diffuser pipe adopts a straight pipe structure, which reduces the exhaust back pressure of the entire system and eliminates part of the exhaust noise, which has achieved good results in actual loading and use. the

Description of drawings

Now in conjunction with accompanying drawing, the utility model is further described. the

Fig. 1 is the structural representation of the utility model. the

Fig. 2 is a sectional view along line A-A of Fig. 1 . the

Fig. 3 is a B-B sectional view of Fig. 1 . the

In the figure: 1. Circular cylinder body, 2. Front end cover, 3. Rear end cover, 4. Front partition, 5. Rear partition, 6. Circular ventilation hole, 7. Outlet diffuser pipe installation hole, 8. Strip air vent, 9, catalytic converter, 10, air-out diffuser pipe, 11, glass fiber, 12, air intake expansion pipe. the

Detailed ways

As shown in Figures 1, 2, and 3, the utility model has a front end cover 2 and a rear end cover 3 respectively engaged at both ends of the circular cylinder 1, and the front partition 4 and the rear partition 5 connect the circular cylinder 1. In the internal interval, a plurality of circular ventilation holes 6 are provided at the lower part of the front partition 4, an air outlet diffuser installation hole 7 is provided at the middle part of the rear partition 5, and a plurality of strip ventilation holes 8 are provided. Around the air outlet diffuser installation hole 7, the air intake expansion pipe 12 is arranged on the upper part between the front end cover 2 and the front bulkhead 4, the outer end of the air intake expansion pipe 12 is open, and the other end is closed by the front bulkhead 4 , the catalytic converter 9 is located between the front bulkhead 4 and the rear bulkhead 5, and the middle part between the rear end cover 3 and the rear bulkhead 5 is provided with an air outlet diffusion pipe 10, and the outer end of the outlet air diffusion pipe 10 is open. , the other end is closed, and glass fibers 11 are filled between the outer wall of the outlet diffuser pipe 10 and the inner wall of the circular cylinder 1 . Through the above arrangement, the noise discharged from the engine exhaust pipe enters the air intake expansion pipe 12 of the present utility model, and through the barrier effect of the air intake expansion pipe 12 and the front partition 4, passes through the air vent on the air intake expansion pipe 12, Realize one-level expansion, eliminate part of low, medium and high frequency noise, and at the same time change the direction of noise and vibration friction in the small air hole, eliminate part of high frequency noise. The noise then enters the catalytic converter 9 from the circular air hole 6 on the front bulkhead 4 to realize the second-stage expansion, and then eliminates part of the low-frequency and intermediate-frequency noise, and the noise passes from the catalytic converter 9 to the long strip air vent on the rear bulkhead 5 8 into the glass fiber 11 to achieve three-stage expansion, and then eliminate part of the low, medium and high frequency noise, and finally the noise enters the outlet diffuser pipe 10 through the small hole on the outlet diffuser pipe 10 to be discharged. the

Claims (1)

1. A circular vehicle exhaust silencer is characterized in that: a front end cover and a rear end cover are respectively engaged at the two ends of the circular cylinder, and the front partition and the rear partition separate the interior of the circular cylinder. , the lower part of the front partition is provided with a plurality of circular ventilation holes, the middle part of the rear partition is provided with an outlet diffuser installation hole, and a plurality of strip-shaped ventilation holes are arranged at the outlet diffuser installation hole Around, the air intake expansion pipe is arranged on the upper part between the front end cover and the front bulkhead, the outer end of the air intake expansion pipe is open, and the other end is closed by the front bulkhead, and the catalytic converter is arranged between the front bulkhead and the rear bulkhead Between the rear end cover and the rear partition, there is an outlet diffuser pipe, the outer end of the outlet diffuser pipe is open, and the other end is closed, between the outer wall of the outlet diffuser pipe and the inner wall of the circular cylinder Filled with fiberglass.