SU926337A1 - Gas flow noise silencer - Google Patents

Description

one

The invention relates to mechanical engineering and can be used to reduce the intensity of gas flow noise, in particular the exhaust gases of internal combustion engines. .

Known silencers gas flow containing a resonant chamber in communication with the pipeline through a channel formed by at least two nozzles installed at the ends of the inlet and outlet of the pipeline. The silencer can reduce gas flow noise tU.

A disadvantage of the known devices is inefficient noise attenuation at low frequencies. . The aim of the invention is to increase the efficiency of sound attenuation.

This goal is achieved by the fact that the nozzles are made in the form of cones with angles at the tops of .20-170.

In this case, the nozzles can be provided with longitudinal partitions on the channel side.

In addition, at least one of the nozzles may be formed by the wall of the resonant chamber.

Figure 1 shows the proposed muffler with a channel having nozzles with different angles at their tops, a longitudinal section; FIG. 2 shows a gas 10 wire of the proposed silencer with a channel made of the same nozzles with tops pointing in one direction, a longitudinal section; in FIG. 3 - the same, directed in opposite directions, a longitudinal section; in fig. - a gas pipeline with a channel in which lamellar partitions are installed, a longitudinal section; figure 5 is the same, side view; on

20 of FIG. 6, the proposed muffler, in which one of the nozzles of the channel is made as part of the wall of a resonant chamber, is a longitudinal section.

The silencer contains inlet and outlet parts 1 and 2 of the pipeline installed in the resonant chamber 3. The end of the intake suit of the pipeline and at the beginning of its outlet part are installed nozzles. In the channel formed by nozzles C, longitudinal partitions 5 are located. Nozzles are made in the form of a cone.

Nozzle C, mounted on the end of the inlet part of the pipeline, can be made as part of the wall 6 of the resonant chamber.

The silencer works as follows.

. The gas flow, passing through the inlet part 1 of the pipeline, enters the channel formed by nozzles A, connecting the gas pipeline with the resonant chamber 3.

The channel and volume of the resonant chamber are an acoustic oscillatory system excited at a certain frequency; at the same time, the gas acquires a greater velocity in the channel and, as a result, friction and reradiation loses some of the sound energy. Then, gases are discharged from the silencer through the outlet part 2 of the pipeline.

The principle of sound attenuation does not change when gas flows through the pipeline

proposed muffler from left to right and from right to left.

The silencer allows you to increase the efficiency of sound attenuation at low frequencies, reducing the size, weight and cost of the silencer.

Claims (3)

1. A gas flow noise silencer containing a resonant chamber communicated with a gas pipeline by means of a channel formed by at least two nozzles installed at the ends of the inlet and outlet portions of a gas pipeline, characterized in that, in order to increase the sound attenuation, the nozzles are made in the type of cones angles at peaks 20-170. 2. Silencer according to claim 1, about tl and h and y and with the fact that the nozzles from the channel are provided with longitudinal partitions. 3. A silencer according to claims 1 and 2, which is based on the fact that at least one of the nozzles is formed by the wall of the resonant chamber. Sources of information taken into account in the examination 1. US patent No. 27650, CL., Published.1952. Rig. I fPui f. iJ ift /