RU2386822C1 - Method of gas flow distribution in noise killer system - Google Patents

Abstract

FIELD: engines and pumps. ^ SUBSTANCE: method of gas flow distribution in noise killer system wherein gas flow gets in through inlet hole (8) to be divided into two flows distributed between separate chambers (2, 3). Said separated chambers (2, 3) move in parallel to get mixed together in mixing chamber (7). ^ EFFECT: reduced noise at smaller power losses and reduced noise killer drag. ^ 1 dwg

Description

The invention relates to a method for distributing a gas stream in gas-producing high-pressure plants when they are released into the atmosphere in compressors, furnaces, etc., in particular silencers of internal combustion engines (ICE).

The gas distribution in the silencing systems of an internal combustion engine is most relevant for a significant distribution of cars and their impact on the environment.

Known gas distribution device (European application EP 1022048, publ. 07.26.2000), designed for uniform and homogeneous distribution when mixing the reducing reagent with exhaust gases using fixed blades for swirling gas movement.

In US patent US 5723041, publ. 03.03.1998, a method for creating flow uniformity by moving the incident liquid into a device with stationary vanes and rotating impeller vanes is described.

In patent RU 2322593, publ. 04/20/2008, “A method of distributing gas in a silencer-catalyst system of an internal combustion engine and a gas distribution device intended for use in it” proposes the distribution of a gas stream, in particular through a series located at the same distances from the gas stream other curved blades, with some of the blades located in the plane perpendicular, and part parallel to the axis of the vortex chamber.

In the Russian patent RU 2113600, publ. 06/20/1998 and A.S. SU 1719671, publ. 03/15/1992, included various types of blades to reduce noise, create a rotational movement of gas.

In international application WO 9701387, publ. 01/16/1997, the reaction of the reducing reagent with exhaust gases in successive longitudinal channels with flows in opposite directions is described.

The closest way to distribute the gas flow in a noise suppressor system is patent RU 2322593, publ. 04/20/2008, “A method for distributing gas in a silencer-catalyst system of an internal combustion engine and a gas distribution device for use in it”, where the gas flow is distributed through oriented curved blades fixedly mounted in the housing, thereby restricting the oscillatory movement of the gas flow the walls of the blades and the body.

The disadvantage of this method is the loss of energy due to a change in gas movement and friction against the oriented curved surfaces of the blades, which together represent spaces enclosed on four sides. Loss of friction in the muffler - catalyst reduces engine power and the quality of cleaning cylinders from combustion products. A continuous gas stream is a constant causative agent of vibration and preservation of the noise source.

The technical result of the proposed method is to intensify mixing and damping the noise and is achieved by the fact that the gas stream entering through the inlet is divided into two streams that are distributed into the volumes of individual chambers moving parallel and counter-connecting in the mixing cavity.

The specified technical result is ensured by the distribution of the gas flow over two sets of individual chambers moving in parallel and entering the common mixing cavity towards each other with the possibility of repeating the movement in a similar way. The total volume of the moving chambers corresponds to the volume, in particular, of the exhaust gases of the internal combustion engine. Two moving sets of individual chambers create active oncoming streams, contributing to the mixing and suppression of noise.

The scheme of action is shown in the drawing on the example of a silencer of an internal combustion engine having a housing 1, upper 2 and lower 3 individual chambers bounded by side walls 4, the housing 1 and the bottom 5, rotation pulleys 6 of the guide chambers, mixing cavity 7, input 8 and output 9 holes.

When the gas stream moves through the inlet 8, it is divided into two streams and distributed into the upper 2 and lower 3 individual chambers, which move towards the mixing cavity 7. The restrictions by the side walls 4 eliminate the disturbing forces of the oscillatory movement of the gas stream and contribute to the damping of oscillations in each taken camera. When gas escapes from the volumes of individual chambers into the mixing cavity, their oncoming movement reduces the noise effect.

The side walls 4 and the bottom 5 are stationary relative to each other and the volume of gas in the individual chambers. The friction of the gas in the chambers occurs along the housing 1, which reduces the energy consumption for the movement of the gas stream in comparison with existing methods of distribution of the gas stream.

The claimed method is characterized in that the gas flow distribution occurs in the volume of individual chambers without a significant change in the direction of gas flow movement, reduction of friction losses against fixed oriented curved blades inherent in the prototype, intensification of damping of vibrations in unit volumes and with the oncoming movement of two flows in the mixing cavity . In this case, the dimensions of the mixing cavity and the free exit of the gas stream from the mixing cavity reduce the energy loss due to damping of vibrations.

Oscillatory movement of oncoming flows in antiphase oscillations can completely eliminate the noise effect of the gas flow.

The distribution of the gas flow over the volumes of individual chambers eliminates disturbance from the previous section. The side walls 4 are fixed relative to the volume of gas distributed in the individual chamber, and provide protection from disturbance energy and contributes to the damping of oscillations.

The movement of the chambers occurs, in particular, due to the energy of the exhaust gases of the internal combustion engine.

The effectiveness of the method of distributing a gas stream in a silencer system is achieved:

- replacing the quenching of exhaust energy by mechanical influences on the gas stream by dividing it into elementary volumes;

- organization of sequential moving small volumes of gas flow;

- the exception of the curvature of the gas flow;

- reduction of sliding friction of the gas flow on fixed guides;

- protection of the volume of gas distributed in the individual chamber with a relatively motionless wall from the action of the disturbing force of the oscillation of the previous main gas stream;

- the organization of the oncoming gas flows of the sets of individual chambers with the ability to adjust the phase distribution parameters.

Using the proposed method allows to reduce the noise level with minimal energy loss to significant values and to increase the real power, in particular, the internal combustion engine by reducing the resistance at the exhaust and improving the cleaning of the cylinders of the combustion products.

In existing methods, the sound attenuation function occurs due to the dissipation of sound energy during frictional energy loss of sound vibrations when passing through holes.

Dissipation of sound energy in the proposed method occurs by isolating small volumes of gas in individual chambers from a disturbance source when moving them, which reduces the aerodynamic drag of the muffler and, therefore, increases the filling and cleaning of the cylinders.

Claims (1)

A method of distributing a gas stream in a noise suppressor system, which consists in the fact that the gas stream entering through the inlet is divided into two streams that are distributed into the volumes of individual chambers moving in parallel and counter-connecting in the mixing cavity.