RU2265732C1 - Muffler - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention is designed for suppressing exhaust noises in internal combustion engines. Proposed muffler has rectangular housing, inlet and outlet branch pipes, longitudinal partitions forming labyrinth passage with inlet, intermediate and outlet channels. Partitions are interconnected by bridges and are provided with shelves forming slot channels with housing walls. Bridge forms port with muffler housing which connects elbows of gas passage. Inlet and outlet elbows of gas passage are interconnected by slot channels, and ribs are made in bridge. Inlet branch pipe can be arranged in center of muffler. Gaskets of noise absorbing material can be placed in end faces of housing.

EFFECT: possibility of effective use of muffler volume for resonant damping of noise.

3 cl, 5 dwg

Description

The invention relates to the field of engineering and is intended primarily to damp exhaust noise in internal combustion engines.

Known silencer of gas flow noise for an internal combustion engine, comprising a housing and at least one perforated pipe placed therein, or a curved gas duct of three perforated pipes forming a common resonance chamber with the housing (see German application No. 3740341 of 11.27.97, cl F 01 N 1/08).

The design drawback is that the perforated hole does not absorb sound energy of the high-frequency spectrum of the noise field poorly. The silencer has a complex structure and detects a lack of technological development.

A gas flow silencer is also known, comprising a case with corrugations, in which parallel curved partitions are located, forming a curved channel that divides the body into three resonant chambers, interconnected by slots formed by the gap between the shelves of the partitions and the wall of the body (see a.c 1773279, CL F 01 N 1/10 dated 09/21/90).

The design flaws include the fact that the Helmholtz principle of resonant absorption of high-frequency sound in narrow channels that communicate with resonant cameras is not effectively used. The design is taken as a prototype.

The objective of the invention is the most efficient use of the volume of the silencer for resonant sound absorption in a wide range of frequencies, including the high-frequency spectrum.

The problem is solved in that in the gas flow silencer the jumper forms a window with the silencer body that connects the gas duct bends, the inlet and outlet gas duct bends are also interconnected by gap channels, and ribs are made in the bridge to form gap channels.

The inlet pipe and the inlet elbow of the duct can be placed in the center of the housing, which makes the structure stiffer. At the ends of the silencer body, gaskets made of sound-absorbing material can be installed, which simultaneously serve as sound insulators between the elbows of the duct.

The invention is illustrated by drawings, where figure 1 shows a General view of a muffler, a section;

figure 2 is a section aa in figure 1;

figure 3 - section bb in figure 1;

figure 4 is a General view of the Central inlet pipe;

figure 5 is a section bB in figure 4.

The gas flow silencer comprises a rectangular housing 1 with end walls and parallel inlet 2 and 3 outlet pipes and longitudinal partitions 4 forming a labyrinth gas duct with inlet 5, intermediate 6 and outlet 7 elbows. Partitions 4 are provided with shelves 8, in which ribs 9 are made, forming slotted channels 10 with the wall of the housing 1. In the jumper 11, ribs 9 are made, which form slotted channels 10 with the wall of the housing 1, by means of which the elbows 5 and 7 communicate with each other.

The housing 1 can be made with a central inlet 2 pipe, while the jumper 8 forms a window 12 with the wall of the housing 1, which connects the intermediate 6 and the outlet 7 of the duct bend.

At the junction of the partitions 4 with the end walls of the silencer housing 1, sound-absorbing gaskets 13 can be installed, which reduce noise and simplify the assembly of the structure.

The muffler works as follows. The flow of exhaust gases enters through the inlet pipe 2 into the inlet elbow 5 of the duct, in which sound waves from the walls of the housing 1 of the partition 4 flow into the slit channels 10, while the outlet 7 and the intermediate 6 of the duct bend become active resonant chambers. The efficiency of resonant absorption of sound energy is ensured by many slotted channels 10, where the vibrational velocity of gas particles due to sound waves is reduced due to friction against the walls. The principle of interference absorption of sound energy determines the design of the labyrinth scheme of the duct, all the elbows 5; 6; 7 which communicate with each other through slotted channels 10.

This design of the silencer provides high efficiency with the smallest dimensions of the housing 1, since all the elbows 5, 6, 7 of the labyrinth duct simultaneously serve as resonant chambers, while the silencer has little hydraulic resistance to gas flow.

With a central location of the inlet pipe, the muffler has increased structural rigidity and high sound absorption, as Noise from the surface of the housing is reduced. In this case, the sequence of operation of the knees of the flue changes. Sound-absorbing gaskets increase the sound-absorbing properties of the silencer and facilitate assembly.

Claims (3)

1. A gas flow silencer comprising a rectangular housing with end walls and parallel inlet and outlet nozzles and longitudinal partitions forming a labyrinth gas duct with inlet, intermediate and outlet bends, the partitions being interconnected by a jumper and provided with shelves forming with the walls of the housing slotted channels, characterized in that the jumper forms a window with the silencer body that connects the elbows of the duct, the inlet and outlet elbows of the duct also communicate between battle with slotted channels, and ribs are made in the jumper for the formation of slotted channels. 2. The muffler according to claim 1, characterized in that the inlet pipe is located in the center of the muffler. 3. The muffler according to claim 1, characterized in that gaskets of sound-absorbing material are placed at the ends of the housing.

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