RU2350764C2 - Ice exhaust silencer - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: proposed device incorporates silencer casing divided by partitions into two or more chambers, intake and discharge branch pipes and pipeline. The pipeline inlet end is located in the silencer last chamber, while its outlet end face is fitted coaxially in the discharge branch pipe. The pipeline length exceeds that of the discharge branch pipe. Pipeline area-to-discharge branch pipe circular area ratio makes 0.9 to 1.1. The pipeline can be arranged in silencer casing.

EFFECT: higher efficiency of silencing.

2 cl, 2 dwg

Description

The invention relates to the field of engine engineering and can be used to reduce exhaust noise.

A device for damping the noise of an exhaust from an internal combustion engine (ICE) is provided, comprising a housing divided by a partition into a main and damping cavity, an exhaust pipe and an intermediate pipe placed in the housing, integral with the exhaust pipe and having a window in the initial portion communicating with the main cavity while the intermediate pipe is made in the form of a spiral, placed on the periphery of the housing and communicated with the output end with a damping cavity, and the exhaust pipe is placed in the main cavity (RF Patent No. 2 013575, IPC F01N 1/08, 05/30/94).

A disadvantage of the analogue is the high hydraulic resistance of the spiral pipe and the limited damping of noise.

A device is known comprising an exhaust manifold, a receiver, an exhaust pipe, a silencer body divided by partitions into cavities, an exhaust pipe (AS USSR No. 643659, class F01N 7/02, 1979).

A disadvantage of the known device is the lack of effectiveness of damping noise.

A device is known, selected as a prototype, containing an exhaust manifold, receiver, exhaust pipe, silencer body, divided by partitions into two or more cavities, an exhaust pipe, in which the receiver is connected to the silencer body with additional pipes of a greater length, providing a compression wave in time silencer body between the waves exiting into the silencer body from the first pipeline, each pipe is communicated by the outlet end with one or different cavities, and the exhaust pipe Larger lengths are made with a large flow cross-section, which ensures a cyclical gas flow rate of the same as through a short pipeline (RF Patent No. 22525229, IPC ⁷ F01M 1/00, 06/27/2005).

A disadvantage of the known device is the lack of effectiveness of damping noise.

The objective of the invention is to increase the efficiency of noise suppression due to the location of the inlet end of the pipeline in the last cavity of the silencer body, and the outlet end of the pipeline coaxially in the exhaust pipe.

This object is achieved in that in a device for damping the exhaust noise of an internal combustion engine, comprising a silencer body divided by partitions into two or more cavities, an inlet and an outlet pipe and a pipeline, in contrast to the prototype, the inlet end of the pipeline is located in the last cavity of the muffler, and its outlet end is located coaxially in the outlet pipe, while the pipeline has a longer length compared to the outlet pipe, and the ratio of the area of the pipeline to the annular area of the outlet pipe and is 0.9-1.1.

In addition, the pipeline can be made in the silencer housing.

The invention is illustrated by drawings: figure 1 shows a diagram of a device for damping the noise of the exhaust of an internal combustion engine; figure 2 shows a graph of fluctuations in gas flow over time in the exhaust pipe and pipe, located coaxially.

A device for damping the noise of an exhaust from an internal combustion engine comprises an inlet pipe 1, a silencer body 2 divided by partitions into two or more cavities, an exhaust pipe 3, and a pipe 4 of a greater length compared to the exhaust pipe 3. The inlet end of the pipe 4 is located in the last cavity of the silencer body, and its outlet end is located coaxially in the exhaust pipe. The pipeline has a length that ensures the arrival of a compression wave in antiphase with a compression wave in the exhaust pipe, and the ratio of the area of the additional pipeline to the annular area of the exhaust pipe is 0.9-1.1.

A device for damping the exhaust noise of an internal combustion engine is as follows. The compression wave through the inlet pipe 1 enters the first cavity of the muffler 2 and then into the last cavity. In the last cavity of the silencer, the compression wave is divided into two waves, which move along the exhaust pipe 3 and the pipe 4 at approximately the same speed. Since the pipeline 4 has a greater length than the exhaust pipe 3, the release of a portion of gas from the pipe 4 occurs later. The lengths of the exhaust pipe and pipeline are selected in such a way as to ensure the arrival of compression waves in antiphase (figure 2), which allows to reduce fluctuations in the flow rate of exhaust gases and, accordingly, the amplitude of sound vibrations.

So, the claimed invention improves the efficiency of damping the noise of the release.

Claims (2)

1. A device for damping the exhaust noise of an internal combustion engine, comprising a silencer body divided by partitions into two or more cavities, an inlet and an outlet pipe and a pipeline, characterized in that the inlet end of the pipeline is located in the last cavity of the muffler, and its outlet end is located coaxially in the outlet pipe, while the pipeline has a longer length compared to the outlet pipe, and the ratio of the area of the pipeline to the annular area of the outlet pipe is 0.9-1.1. 2. The device for damping exhaust noise according to claim 1, characterized in that the pipeline is made in the silencer body.

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