CS255712B1 - Exhaust silencer - Google Patents

Abstract

The solution is to create a structure silencer with higher efficiency, durable against elevated exhaust gas temperatures behind a catalyst cleaner placed in its immediate proximity. The goal is achieved by taking the inlet chamber in the front the damper is connected by a transfer tube to the rear chamber, the rear chamber being tube with a perforated reflective chamber through the pipe, entering the buffer chamber with calming chamber.

Description

MIHALIK ZDENEK, MLADA BOLESLAV

Exhaust silencer

The purpose of the solution is to provide a more efficient muffler structure resistant to elevated exhaust gas temperatures downstream of the catalytic converter located in its immediate vicinity. The object is achieved by the inlet chamber at the front of the damper being connected by a transfer tube to the rear chamber, the rear chamber being connected by a pipe to a reflective chamber with a perforated pipe leading to a buffer chamber with a calming chamber.

(52) Int. Cl *

F 01 N 3/28, F 01 N 1/03

-ι255 712

The present invention relates to an exhaust silencer with a modification for connecting a catalytic cleaner or an expansion chamber, particularly suitable for passenger cars with an engine located in the rear of the car, engine units and the like.

In the exhaust traces of internal combustion engines supplemented with a catalytic cleaner, the combustion of the unburnt fuel components on the surface of the catalytic converter results in an increase in the temperature of the exhaust gases, which may cause a reduction in the service life of the downstream members. This danger is negligible in motor vehicle exhaust systems with the engine located in the bow of the vehicle, where the exhaust gases are effectively cooled by a long exhaust pipe before entering the exhaust silencer located at the rear.

Exhaust gas temperature problems arise in motor vehicles with the engine located in the rear of the vehicle, or in the case of engine units, where, due to the small clearance of the catalytic converter, the muffler is excessively thermally stressed ·

The design of the exhaust silencer according to the present invention eliminates these disadvantages by having an inlet chamber at the front of the silencer connected by a transfer tube to the rear chamber, wherein the rear chamber communicates with the reflective chamber and the perforated tube opening into the buffer chamber with the calming chamber. the pipe is connected to the equalization chamber by openings having a total area of 4 to 8% of its cross-sectional area and that the tubes projecting into the space of the reflective chamber are coaxial and the distance between their ends is 0.6 to 0.9 times their diameter.

Such an arrangement of the muffler will be particularly beneficial in terms of location most thermally stressed chambers con "3" ^255,712-UP cylindrical housing with a hemispherical end and the large area where the inlet flue gas prior to coming to the chambers own damper partially cooled, thus reducing both the demands attenuation, but especially its lifetime ·

An exemplary embodiment of an exhaust silencer according to the present invention is shown in the appendix and represents a cross-section in an oblique view.

In the cylindrical casing 1 of the damper, terminated by the inlet chamber 2 and the rear chamber 1 of the hemispherical shape, the equalizing chamber 6, the calming chamber 6 ^{and the} reflecting chamber 6 are located and separated by baffles. provided with openings 8 in the part passing through the compensating chamber 8, the rear chamber χ is connected to the reflecting chamber 6 by a tube 2. The perforated tube 10 located in the axis of the tube 2 ^and connecting the reflecting chamber 6 to the calming chamber The exhaust pipe 11 connecting the muffler to the ambient air and bridging the rear chamber J and the reflective chamber 6 opens into the calming chamber 2 _; where it is perforated.

Exhaust gases flowing into the muffler via the catalytic cleaner 12 located in its immediate vicinity enter the inlet chamber. 2, heavily air-cooled, and the transfer tube 2 are discharged to the rear chamber 2, which is also well cooled, thereby partially expanding and lowering the temperature so that the damping system to which they pass from the rear chamber is not excessively thermally stressed and the environment works more efficiently, resulting in more efficient attenuation.

Claims (3)

SUBJECT OF THE INVENTION 25S 712 Exhaust silencer with modification for connection of catalytic cleaner or expansion chamber, suitable especially for passenger cars with engine located in the rear of the car, engine aggregates from below, characterized in that the inlet chamber (2) in front of the silencer is connected by transfer tube ( 7) with a rear chamber (3), wherein the rear chamber (3) is a tube (9) in communication with a reflective chamber (6) and a perforated tube (10) leading to a buffer chamber (4) with a calming chamber (5). Exhaust damper according to claim 1, characterized in that the transfer tube (7) is connected to the compensating chamber (4) by holes (8) whose total area is 4 to 8% of the cross-sectional area thereof. Exhaust silencer according to claim 1 or 2, characterized in that the pipe (9) and the perforated pipe (10) are coaxial and the distance between their ends in the space of the reflecting chamber (6) is 0.6 to 0.9 times their diameter. .