Novel noise reduction manifold

Abstract

The invention relates to a novel noise reduction manifold. The novel noise reduction manifold comprises an air inlet pipe and a connecting manifold, wherein an air inlet at the top end of the air inlet pipe is connected with a hose through an air inlet pipe flange; a closed buffering noise reduction pipe bottom is arranged on the bottom end of the air inlet pipe; the rear end of the connecting manifold communicates to the middle of the air inlet pipe; an air outlet at the front end of the connecting manifold communicates with an air inlet end of a supercharger through a manifold flange; the connecting manifold is arranged in the middle of the air inlet pipe, so that when the introduced gas enters the supercharger through the air inlet pipe, the introduced gas firstly reaches the bufferingnoise reduction pipe bottom and enters the supercharger after being turned through the buffering noise reduction pipe bottom, therefore, the gas flow pre-rotation in the air inlet pipe is weakened, the pressure fluctuation of inlet air is effectively reduced, the surge trend of the supercharger is weakened, the stability of the gas flow in the supercharger is improved, and the Hiss noise is effectively lowered.

Description

technical field [0001] The invention relates to the technical field of turbocharger equipment, in particular to a novel noise reduction manifold. Background technique [0002] The turbocharger uses the high-temperature exhaust gas discharged from the engine to drive the turbine in the turbine to rotate to do work. The turbine shaft drives the impeller in the coaxially connected compressor to rotate at high speed, compressing the air in a centrifugal manner, and providing high-pressure, high-density air to the engine. . In this way, we can inject more fuel to the engine to achieve the purpose of increasing engine power, torque and reducing emissions. [0003] With the increasingly stringent emission regulations, especially the proposal of carbon emission restrictions, supercharging technology has become an inevitable choice for the development of engine technology. The noise problem in the supercharger is particularly important. Although the invention of the supercharger ha...

AI Technical Summary

Problems solved by technology

Based on the generation mechanism of Hiss noise, there are two ways to reduce this noise: one is to control the noise from the source, keep the compressor running line away from the surge line or the marginal surge area, and effectively reduce the turbulence excitation, but this method is often It is very difficult, because it is difficult to find a compressor model that satisfies both high-speed power and low-speed torque, and reducing torque is something that engine design and development do not want to see; the second is control from the transmission path: including reducing the radiation of the pipeline , Strengthen the sealing of the whole vehicle, etc.; the cost of strengthening the sealing of the whole vehicle is relatively high, and it involves the manufacture of the whole vehicle, the process is complicated, and it is difficult to realize

The ideal way is to improve the air intake pipe; the existing air intake pipe is L-shaped and is a suspension long-arm type. One end is connected to the pressure end of the supercharger through a flange, and the other end is directly sleeved on the hose. ANSYS software is used for simulation analysis of the intake pipe. The modal calculation results show that the modal frequency range of the first few orders of the intake pipe of this structure is 600-3800 Hz, and the Hiss noise frequency range of the supercharger is between 1500-3800 Hz. The noise at 2500Hz is the most obvious, so it is in the natural frequency range of the first few orders of the intake pipe, which has a significant impact on Hiss noise

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