RU2493381C1 - Engine silencer - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: engine silencer comprises case, inlet and discharge pipes. Said case accommodates vertical and horizontal spreaders and vertical lengthwise baffle. Vertical spreader had orifice holes made behind the discharge pipe edge and front holes to decrease resistance to offgas flow. Vertical lengthwise baffle and horizontal spreader are provided with holes to communicate all four offgas flows ahead of discharge pipe outlet.

EFFECT: higher efficiency of exhaust system.

1 cl, 3 dwg

Description

A device for damping engine noise relates to the field of automotive industry and is intended for use in the exhaust system of a car, in order to reduce noise, reduce temperature, speed and pressure of exhaust gases, as well as eliminate resonance phenomena.

A device for damping noise (patent RU 2362023 C1), comprising a cylindrical body, a transverse partition in the form of a plate with perforation, an inlet and outlet pipe, fixed from the ends of the housing and rigidly connected to the transverse partition inside the housing. The nozzles have perforation directly at the partition. Between the casing and the nozzles are mounted intermediate hollow cylinders with perforation, which are rigidly connected to the partition and with intermediate rings, also having perforation. The perforation of the plate is made along its edge in one third of the area, and the perforation of the intermediate cylinders is located on opposite sides of the partition. The disadvantage of the invention is the large geometric dimensions.

Also known is an exhaust silencer of an internal combustion engine exhaust (patent RU 2191268 C2), comprising a cylindrical body with end walls, in which four successive chambers are formed by transverse partitions: inlet, outlet and two additional, coaxially arranged inlet and outlet pipes and axially located and placed on both sides of the axis of the housing are intermediate nozzles, and the cavity of the nozzles are connected to the chamber cavities by means of their open sections and through perforated Cove. In all chambers, the sections of the nozzles are dynamic or imaginary (the beginning of the perforation section along the gas flow), along which the gas flow is supplied or discharged from the corresponding chamber, located in the nodal zones of the lower intrinsic resonance modes of gas volume enclosed in the cavity of the corresponding chamber, therefore modes are not excited, since the pressure in these modes in the excitation zone is close to zero. At the same time, pulsating gas flows at the inlet section of the nozzles do not experience the corresponding resistance and do not transfer, therefore, energy to the corresponding modes. The disadvantage of this invention is the high resistance to the movement of the exhaust stream.

Of the known ones, the closest in technical essence is a silencer of the exhaust of an internal combustion engine (patent RU 2220298 C2), comprising a cylindrical body with an inlet pipe and an outlet pipe installed in its end wall, an outlet and acoustic chambers formed by shells mounted coaxially one into the other and their bases adjacent to the end wall of the housing. The lengths of the shells increase with the removal of the shells from the axis of the housing. Hollow conical acoustic chambers are installed in the acoustic chambers coaxially with their vertices toward the outlet pipe, the diameter of the bases of which increases as the diameters of the shells increase. On the outside of the base of the conical acoustic chambers, turbine blades are installed along the entire circumference of the base. In front of the inlet, a perforated, truncated housing is installed with its apex toward the inlet nozzle and a perforated nozzle is installed at the top of the cone. The disadvantage of the invention is the design complexity.

The technical result is to reduce the temperature, speed and pressure of the exhaust gases by throttling and increased heat transfer to the walls of the muffler, dissipating the energy of the exhaust gases, eliminating resonance phenomena in the muffler, due to its design features.

The present invention is aimed at reducing noise during the operation of the internal combustion engine, by separating the exhaust gas stream, turning them and combining them again into one stream, as a result of which, when the traffic is in opposite direction, the resulting vortices are mutually destroyed and their energy dissipated.

This is achieved by the fact that in the device for damping engine noise, comprising a housing, inlet and outlet pipes, according to the invention are additionally introduced - the exhaust pipe enters the housing to the holes in the horizontal divider and in the vertical longitudinal partition, a vertical divider with throttles is mounted in the housing holes made behind the outlet pipe cut-out and holes in the front part, horizontal divider, with a hole in front of the pipe outlet cut-out, vertical Single longitudinal partition with a hole cut in front of the outlet.

The diameters of the holes in the vertical longitudinal partition and the horizontal divider are 1.4-1.6 diameters of the outlet pipe and are at a distance of 2.2-3.2 diameters of the outlet pipe from the top of the divider. The vertical divider has openings in the front.

The introduction of vertical and horizontal dividers, a vertical partition into the design allows organizing the movement of exhaust gases in such a way as to ensure sequential separation, changing the direction of the exhaust gas flow with their subsequent oncoming movement, resulting in the mutual destruction of the vortices and the dissipation of the energy of the exhaust gases.

The openings of the vertical divider behind the exhaust pipe cut allows for a turn of the exhaust gases, which in turn leads to an increase in the path traveled by the gases and heat transfer to the walls of the muffler.

In Fig.1 schematically shows a top view of a device for damping engine noise, in Fig.2 and Fig.3 shows sections of the proposed device.

1 - inlet pipe

2 - case

3 - exhaust pipe entering the body for more than half the length

4 - vertical divider with throttling holes

5 and 6 - throttling holes

7 - horizontal divider

8 - vertical partition

In this case, the inlet pipe 1 and the exhaust pipe 3 are hermetically connected to the housing 2, the exhaust pipe 3 enters the housing 2 to the holes in the horizontal divider 7 and the vertical partition 8, the vertical divider 4 has throttling holes 5, which are located behind the cut of the exhaust pipe, relatively the direction of movement of the exhaust gases, throttling holes 6 located in its front part, the horizontal divider 7 is connected to the housing 2, the vertical divider 4 and the vertical partition 8 and relies on the same distance from the upper and lower walls of the housing 2. The vertical divider 4, a horizontal divider 7, a vertical partition 8 may be executed as a single piece or of several joined by welding.

A device for damping engine noise as follows.

The inlet pipe 1 receives the exhaust gases of the internal combustion engine, which collide with a vertical divider 4 and a horizontal divider 7, hermetically connected to the housing, and are divided into four flows enveloping the vertical divider 4. With further movement, they wash the inner surfaces of the housing and flow through the throttling holes 5 of the vertical divider 4. Since the hole of the outlet pipe is in front of the throttle holes 5, relative to the direction of movement of the exhaust call, and the pressure of the heated gases is higher than atmospheric, then the exhaust gases are deployed and move to the outlet of the exhaust pipe 3. Exhaust gases pass through the holes in the horizontal divider 7 and the vertical partition 8. Four streams move towards each other, collide. As a result, mutual destruction occurs, formed during the movement of gases inside the muffler, vortices and the dispersion of the energy of the exhaust gases. The exhaust gases are combined into a single stream, rotate under the influence of excess pressure and exit into the atmosphere through the exhaust pipe 3. Throttle openings 6 serve to reduce the resistance to the movement of the exhaust gas flow and organize blowing. As a result, a low-pressure region is formed at a section of the outlet pipe 3.

Exhaust gases moving from the inlet pipe meet with dividers located in the vertical and horizontal plane and are divided into four identical flows. Then they pass through the throttling openings of the vertical divider and turn around, moving to the opening of the exhaust pipe, which enters the silencer body more than half the length of the body. A vertical partition located in the plane of symmetry serves to separate the flows as they move to the outlet of the outlet pipe. The horizontal divider and the vertical partition have round holes located in front of the outlet nozzle opening, designed to combine all four streams before exiting the muffler.

The present invention allows to reduce the noise level during the operation of the internal combustion engine, due to the separation of the exhaust gas stream, their reversal and combining again into one stream, as a result of which, when they meet, there is a mutual destruction of the formed vortices and dissipation of their energy.

Claims (1)

A device for damping engine noise, comprising a housing, inlet and outlet nozzles, characterized in that the housing has a rectangular cross-sectional plan, turning into a truncated cone, in the housing, in order to separate the exhaust gas flow, the vertical and horizontal dividers are mounted symmetrically with respect to the axis of the nozzles, vertical longitudinal partition, the distance between the housing and the vertical divider, the vertical divider and the vertical longitudinal partition are equal, the vertical divider has other settling holes made behind the front cut of the outlet pipe, and holes in the front part, the apex of the divider is located at the junction of the case from a rectangular section into a truncated cone, holes with a diameter of 1.4-1.6 of the diameter of the outlet pipe are made in the vertical longitudinal partition and horizontal divider and are at a distance of 2.2-3.2 diameters of the outlet pipe from the top of the vertical divider, the outlet pipe enters the housing to the holes in the horizontal divider and vertically longitudinal bulkhead.

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