Apparatus for removing exhaust gas pressure and preventing backflow of exhaust gas

Abstract

An apparatus for removing exhaust gas pressure and preventing backflow of exhaust gas is disclosed. The apparatus includes a mounting pipe, which is fitted over the end of an exhaust gas pipe of an internal combustion engine and has therein backflow gas guide holes at positions adjacent to the exhaust gas pipe, and a secondary exhaust gas pipe, which surrounds the mounting pipe. In the apparatus, a backflow passage is defined between the mounting pipe and the secondary exhaust gas pipe, so that a backflowing portion of exhaust gas, which is discharged from the mounting pipe, is drawn into the backflow passage and is guided into the mounting pipe through the backflow gas guide holes, and the guided backflow gas is discharged outside again.

Description

CROSS REFERENCE TO PRIOR APPLICATIONS[0001]This application is a Continuation Application of the U.S. Application having Ser. No. 12 / 664,423 filed on Dec. 14, 2009, which is a National Stage Patent Application of PCT International Patent Application No. PCT / KR2007 / 004977 filed on Oct. 11, 2007, which claims priority to Korean Patent Application Nos. 10-2007-0059152 filed on Jun. 15, 2007 and 10-2007-0100532 filed on Oct. 5, 2007, which are all hereby incorporated by reference in their entirety.BACKGROUND[0002]Generally, in the case of internal combustion engines, because exhaust gas, which is a pollutant occurring as a result of the combustion in an internal combustion engine, is discharged at a relatively high pressure of approximately 3 to 5 kg / cm2 and at a relatively high temperature of approximately 600° C., a catalytic device and a silencer are essential.[0003]In the internal combustion engine, when exhaust gas is discharged from the engine, a vacuum is created in an exhaust ma...

AI Technical Summary

Benefits of technology

The present invention aims to provide an apparatus that can remove exhaust gas pressure and prevent the backflow of exhaust gas. The apparatus includes a gas guide blade unit that minimizes collisions between backflow gas and exhaust gas, and increases the speed at which exhaust gas is discharged, resulting in a smooth and rapid exhaust gas discharge. Additionally, the gas guide blade unit includes a longitudinally curved cross-section that reduces the cross-sectional area of the space defined by the gas guide blade unit in the direction in which exhaust gas is discharged, further increasing the flow speed of exhaust gas.

Problems solved by technology

In this gas discharge process, the silencer is typically designed to have a capacity that is fifteen to twenty times larger than the engine displacement, so that exhaust resistance is unavoidably created.

In the case of boilers, when opposite airflow is applied to a gas flue, outside air flows backwards, and it may enter a combustion chamber, with the result that incomplete combustion is induced and that steam and suspended nitrogenous compound matter, created during the combustion process, become adsorbed on the surface of a heat exchanger.

In the case where such events are repeated, the performance of a heat exchanger of the boiler is deteriorated, and a problem of a reduction in thermal energy is induced.

However, this technique is disadvantageous in that the streamlined body has a relatively large and complex structure, which affects the installation thereof, so that it is very difficult to use this technique in practice.

However, there is a problem in that the blade serves as a source of some resistance that interferes with the flow of exhaust gas, and the construction thereof may be deformed by high heat, thus it cannot be used in practice.

However, in this technique, because a sub duct, through which outside air passes, is provided on the front end of the silencer, which serves to generate vortexes in the exhaust gas discharge path and reduce exhaust noise, exhaust noise is transferred outside through the sub duct, thus increasing noise.

Furthermore, due to the installation of the outside air regulating damper, which is operated in conjunction with the throttle valve of the engine, there is a disadvantage in that the structure and the configuration of the device are complicated.

However, this device is constructed such that vortexes are created by the steel plates and the screw plates in a flared tube, so that exhaust gas must pass through a relatively narrow path.

Therefore, the device is problematic in that it is structurally unstable, exhaust resistance and backflow of air are generated, and aerodynamic noise is generated around the rear end of a silencer.

However, there are disadvantages in that, when the vehicle is stopped or travels at a low speed, the effect thereof is markedly reduced, and, when the vehicle travels at a high speed, aerodynamic noise is generated around the rear end of the silencer.

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