Silencer for exhaust system of gasoline engine

Abstract

The invention provides a silencer for an exhaust system of a gasoline engine. A silencing assembly of the silencer comprises a one-hole tray, a two-hole tray, a three-hole tray, a connecting pipe, a first-stage porous pipe, a first-stage silencing pipe, a second-stage silencing pipe and a guide pipe, wherein the one-hole tray, the two-hole tray and the three-hole tray divide a silencer cylinder into a first cavity, a second cavity and a third cavity; the first-stage silencing pipe is arranged in the two-hole tray in a penetration manner, one end of the first-stage silencing pipe is opened and is arranged in the first cavity to be opposite to an exhaust end of the first-stage porous pipe, and the other end of the first-stage silencing pipe is arranged in the second cavity and is provided with a blanking cap II to form a blind end; the second-stage silencing pipe is arranged on the two-hole tray and the three-hole tray in a penetration manner to communicate the first cavity and the second cavity; and the guide pipe and a tail pipe are both arranged on the three-hole tray, one ends of the guide pipe and the tail pipe are opened and are both arranged in the second cavity, the other end of the guide pipe is arranged in the third cavity, and the other end of the tail pipe is an exhaust end which is arranged outside the silencer cylinder. The silencer disclosed by the invention can be used for depleting kinetic energy and damping vibration of airflow stage by stage so as to effectively reduce the noise during exhaust.

Description

technical field [0001] The present invention relates to a mechanical muffler, and more particularly to a muffler for a gasoline engine exhaust system. Background technique [0002] During the exhaust gas exhausting process of a gasoline engine, the pressure of the exhaust gas will generate a continuous pulsed air flow at the outlet of the exhaust pipe. The pulsed gas rushes out of the exhaust port at high speed. Exhaust noise. Therefore, a motor vehicle generally needs to install a muffler on the engine exhaust pipe. The muffler is used to consume airflow energy, reduce the pressure of the airflow, and reduce noise. [0003] According to the principle of interference, the muffler has two basic muffler methods: absorption and reflection. The absorption muffler converts mechanical energy into heat energy through the friction of exhaust gas on sound-absorbing materials such as glass fiber, steel fiber and asbestos; the reflection muffler There are multiple harmonic chambers c...

AI Technical Summary

Problems solved by technology

Although the muffler has a certain noise reduction effect, the exhaust gas running path formed by the muffler of this structure is not reasonable, resulting in insufficient noise reduction, and cannot effectively reduce the kinetic energy of the airflow, so that the noise reduction effect is not obvious; and the airflow directly Impacting the metal makes the metal vibrate greatly, resulting in greater noise caused by the metal vibration

At the same time, the structure of the muffler is relatively complicated, and the muffler used to achieve the same noise reduction effect is relatively large in size and high in cost

With the increase of motor vehicle speed, the existing mufflers cannot effectively improve the noise pollution caused by the operation of gasoline engines, and need to be continuously improved.

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