RU213650U1 - EXHAUST MUFFLER FOR INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

The utility model relates to mechanical engineering, in particular to silencers for exhaust noise from internal combustion engines of stationary power plants. An internal combustion engine exhaust muffler comprises inlet and outlet pipes, a body divided by a partition into two expansion chambers connected by a bypass pipe, the diameter of the inlet and outlet pipes being less than the diameter of the expansion chambers, the body being formed by a perforated inner shell and an outer shell, the space between which is filled sound absorbing material. The technical result is an increase in the efficiency of exhaust sound absorption over the entire range of engine operation and a reduction in the size of the muffler.

Description

The utility model relates to mechanical engineering, in particular to silencers for exhaust noise from internal combustion engines of stationary power plants.

Known exhaust muffler (patent for invention US11220949, publ. 01/11/2022), integrated into the exhaust channel of the vehicle to reduce exhaust noise and containing a muffler housing with an expansion chamber; an inlet pipe hermetically inserted into the inlet of the muffler housing; and an exhaust pipe hermetically inserted into the outlet of the muffler body, wherein the inlet pipe and the exhaust pipe are provided with openings in their upper portion.

A disadvantage of the known solution when used in stationary power plants is the insufficiently effective damping of sound waves in one resonator unit and requiring the presence of 3 stages (resonators), which increases the size of the muffler.

The closest to the claimed solution is the exhaust device of the internal combustion engine (patent for invention JP7032108, publ. 03/08/2022), including a silencer to reduce the sound of the exhaust. The muffler includes a plurality of expansion chambers, a connecting pipe, and a sound-absorbing element. The expansion chambers have an increased cross-sectional area of the flow section, exceeding the diameter of the exhaust pipe of the internal combustion engine. The connecting pipe connects the expansion chambers in series and forms a connecting channel, the cross-sectional area of which is less than the cross-sectional area of the expansion chamber. The sound-absorbing element is located inside the connecting pipe and absorbs the sound of the exhaust.

The disadvantage of the known solution is that the sound-absorbing element is located only inside the connecting pipe and does not insulate the outer shell, which leads to excessive noise during transient engine operation.

The technical task of the claimed utility model is to increase the acoustic efficiency of the muffler.

The technical result is an increase in the efficiency of exhaust sound absorption over the entire range of engine operation and a reduction in the dimensions of the muffler.

The technical result is achieved by the fact that the silencer of the exhaust noise of the internal combustion engine contains an inlet and outlet branch pipes, a body divided by a partition into two expansion chambers connected by a bypass pipe, while the diameter of the inlet and outlet pipes is less than the diameter of the expansion chambers, the body is formed by a perforated inner shell and an outer shell, the space between which is filled with sound-absorbing material.

The utility model is shown in the drawings:

Figure 1 shows a General view of the muffler of the exhaust noise of an internal combustion engine;

Figure 2 shows the muffler of the exhaust noise of an internal combustion engine in section.

An internal combustion engine exhaust silencer comprises a cylindrical body made of an outer shell 2 and an inner shell 1 with perforation over the entire surface, end caps 3 and 5 with inlet 4 and outlet 6 nozzles equipped with connecting flanges. In the central part of the body 1, a partition 7 is fixed with a bypass pipe 8 hermetically fixed in it. The bypass pipe 8 is placed coaxially with the inlet and outlet openings. Between the outer shell 2 and the outer surface of the body 1 there is a packing 9 made of sound-absorbing material.

Silencer parts (body, shell, bypass pipe) are made of heat-resistant steel. The end caps are fixed to the outer shell of the housing and transfer the load to the connecting flanges through the gussets.

The inner shell 1 is perforated with round holes arranged in a checkerboard pattern. Glass fiber can be used as a sound-absorbing material.

During the passage of the exhaust gas flow, chemically aggressive condensate accumulates in the packing, which causes corrosion of the muffler parts. To drain condensate in the outer shell, condensate drain fittings 10 with meshes 11 are provided, preventing the passage of the packing.

The device works as follows:

An internal combustion engine exhaust silencer consists of two expansion chambers formed by the inner surface of the inner shell 1, a baffle 7 and end caps 3 and 5. the first chamber is the expansion of the exhaust gases. Thanks to the perforated surface of the inner shell 1, the exhaust gases and sound waves pass through the holes of the inner shell 1 and enter the packing 9 between the inner shell 1 and the outer shell 2, which ensures the attenuation of the sound wave and the reduction of the kinetic energy of the exhaust gases. Through the bypass pipe 8, the exhaust gases enter the second expansion chamber. This design design allows for an effective two-stage attenuation of the sound wave.

The condensate accumulating in the packing 9 is discharged through the condensate drain fittings 10, thereby allowing to increase the life of the muffler.

The placement of sound-absorbing material between the perforated inner shell and the outer shell, as well as the design of the muffler with two expansion chambers arranged in series, makes it possible to achieve sound minimization at high frequencies and reduce the heating of the outer shell. This fact allows the installation of this muffler in the aggregate compartment, without additional thermal insulation.

Claims (2)

1. An exhaust silencer for an internal combustion engine, containing inlet and outlet pipes, a housing divided by a partition into two expansion chambers connected by a bypass pipe, while the diameter of the inlet and outlet pipes is less than the diameter of the expansion chambers, characterized in that the housing is formed by a perforated inner shell and outer shell, the space between which is filled with sound-absorbing material. 2. An exhaust silencer for an internal combustion engine according to claim 1, characterized in that condensate drain fittings are made in the outer shell.

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