UA76284C2 - Silencer of exhaust noise of combustion engine - Google Patents

Abstract

A silencer of combustion engine discharge noise has a body 1 with flat walls, this forms expansion chamber 2, an inlet nipple 3 and discharge nipple 4 adjoining the wall 5 of the body 1 opposite to the inlet nipple 3. On the wall 6 of the outlet nipple 4 turned to the inlet nipple 3 waves cowl 7 is installed, its middle section is made convex, and the end sections - concave. This invention makes it possible to increase operation reliability of silencer of noise of combustion engine discharge at simultaneous increase of effectiveness of its noise suppression.

Description

Description of the invention

The invention relates to transport engineering and can be used in the exhaust systems of 2 internal combustion engines, for example, diesel locomotives.

A well-known muffler for the exhaust of an internal combustion engine, which contains a housing, an inlet pipe and an exhaust pipe, is made in the form of a block of baffle-diffuser tubes, articulated with each other to form closed cavities, and the baffle-diffuser tubes have bypass holes made at the point of transition of the baffle in diffuser and in the outlet edge of the diffuser (As. USSR Mo 1180542, РО1М1/08, 7/04, 70. 20.04.84.

The disadvantage of this device is the high voltages in the metal structures of the outlet nozzle at variable loads and high temperature of the gas flow, which leads to a decrease in operational reliability. This design does not ensure the superimposition of asymmetric sound waves, which does not ensure high efficiency of noise reduction. 19 The closest in terms of technical essence and the result achieved to the proposed one is an internal combustion engine exhaust muffler containing a housing with flat walls that forms an expansion chamber, an inlet nozzle and an outlet nozzle adjacent to the wall of the housing opposite to the inlet nozzle, and is made in the form of a block of compartments, the inlet edges of which holes are shifted in height and are located in the expansion chamber of the housing on the same line at an angle to the walls of the housing, and the inlet openings of the compartments of the outlet nozzle are turned to the wall of the housing opposite to the inlet nozzle. (Ass. of the USSR

Mo1199963, RO1M1/08, 1/02, 7/04, 01.06.84).

The disadvantage of this device is that the flat wall of the outlet nozzle faces the inlet nozzle along its entire height, therefore, when the gas flow flows out, it perceives the force from the high-speed head, which falls, which leads to an increase in the stresses in the metal structure of the exhaust nozzle at variable loads and high temperature of the gas flow, and therefore to a decrease in operational reliability. Gee)

The equidistance of the flat wall of the exhaust pipe from the noise source does not ensure the imposition of asymmetric sound waves, which does not contribute to their effective attenuation in a wide range of the frequency spectrum, and therefore reduces the effectiveness of noise suppression.

The invention is based on the task of creating an M internal combustion engine exhaust noise muffler with increased operational reliability while simultaneously increasing the effectiveness of noise reduction by reducing the forces from the gas flow on the metal structure of the exhaust nozzle.

The task is achieved by the fact that in the muffler of the exhaust noise of the internal combustion engine, which contains a housing with flat walls, which forms an expansion chamber, an inlet nozzle and an exhaust nozzle. that "o adjoins the wall of the body, opposite to the inlet nozzle, on the wall of the outlet nozzle facing

From the intake pipe, a wave-shaped fairing is installed, the middle part of which is convex, and the outer parts are concave.

Due to the fact that a wavy fairing is installed on the wall of the outlet nozzle facing the inlet nozzle, the gas flow, gently washing the convex part and then the concave part, is thrown into the expansion chamber, with a high-speed pressure that interacts with the wavy surface of the fairing, C partially extinguishes its energy and contributes to the blurring of the jet core, which allows to reduce the force of the gas flow on the c wall of the exhaust nozzle and thus contributes to the reduction of stresses in the metal structure of the exhaust nozzle, and, as

From" investigation, leads to an increase in the operational reliability of the exhaust silencer. The different distance of the surface of the wave-shaped fairing from the noise source leads to the superimposition of asymmetric sound waves, which achieves multiple interaction of reflected sound waves, improves the intensification of the heat exchange of the flow of gases in front of this surface, which contributes to their effective attenuation in a wide spectrum of frequencies and the smoothing of their pressure fluctuations, which contributes increasing the efficiency of my suffocation.

Ge") The search carried out on the sources of scientific and technical and patent information showed that the set of essential features of the claimed technical solution is unknown. o Thus, the technical solution meets the requirements of novelty, because it is unknown in other fields of technology. o 20 According to the results of the search in known solutions, no set of significant features was found that increase the operational reliability of the muffler of the exhaust noise of the internal combustion engine at the same time

T" increasing the effectiveness of its noise reduction.

Thus, the declared technical solution meets the requirements of the inventive step.

The essence of the proposed solution is explained by the drawings, where: 25 - Fig. 1 shows the general view of the muffler of the exhaust noise;

GF) - in Fig. 2 - section A-A in Fig. 1; - on Fig. 3 - per ipp B-B on Fig. 1. o The muffler of the exhaust of the internal combustion engine contains a housing 1 with flat walls, which forms an expansion chamber 2, an inlet nozzle C and an outlet nozzle 4 adjacent to the wall 5 of the housing 1, 60 opposite to the inlet nozzle 3. On the wall 6 of the exhaust nozzle 4, facing to the intake pipe 3, a wavy fairing 7 is installed, the middle part of which is convex, and the outer parts are concave.

An internal combustion engine exhaust silencer works like this.

The flow of exhaust gases of the internal combustion engine enters the expansion chamber 2 through the inlet pipe C, which is made in the form of an injector, and then smoothly washes the wavy fairing 7 and is thrown away by its concave surfaces into the expansion chamber 2. From the expansion chamber 2, the exhaust gases enter the exhaust pipe 4, adjacent to the housing wall 5, opposite to the inlet nozzle 3. The high-speed pressure of the gas flow partially extinguishes its energy and contributes to the blurring of the jet core, which allows to reduce the force on the wall b of the outlet nozzle 4, and therefore to reduce the stress in the metal structure of the outlet nozzle 4. This leads to increase the operational reliability of the exhaust silencer.

The imposition of asymmetric sound waves due to their reflection from the wave-shaped fairing 7 contributes to the effective attenuation of sound waves in a wide spectrum of frequencies and the smoothing of their pressure fluctuations, which contributes to increasing the effectiveness of noise reduction.

The design of the fairing 7, located opposite the intake nozzle, is wave-shaped, helps to reduce the aerodynamic resistance of the exhaust, which leads to a decrease in specific fuel consumption.

Claims (1)

The formula of the invention is an internal combustion engine exhaust muffler comprising a flat-walled housing that forms a /5 expansion chamber, an inlet port and an outlet port that adjoins the housing wall opposite the inlet port, characterized in that on the outlet port wall, inverted to the intake pipe, a wavy fairing is installed, the middle part of which is convex, and the extreme parts are concave. with more 6) « (ee) with (Se) and - - and? -i (o) ime) (ee) s» ime) 60 b5