RU2283434C1 - Multisection silencer for exhaust air ducts of compressors - Google Patents

Abstract

FIELD: mechanical engineering; gas-turbine engines.

SUBSTANCE: invention relates to process of noise damping of compressor stations and test bays for gas-turbine engines. Proposed silencer has cylindrical base rigidly connected with intake branch pipe. Noise-absorbing unit secured on base consists of separate series-connected sections, each being made of layer of noise-absorbing material lined from inside with perforated envelope, and from outside, with rigid material. Ratio of inner diameter of silencer D to diameter of inlet air duct (intake branch pipe) of silencer B is within D/B=1.0-1.5; ratio of outer diameter of inlet air duct of silencer B is within C/B=1.5-2.0; ratio of length of silencer section b to diameter of inlet air duct of silencer B is b/B=2.0-7.0. Sections of noise-absorbing unit are made in for of triangle or ellipse in section square to axis of silencer. Filters are mounted at inlet of intake and outlet of exhaust branch pipes of silencer to entrap oil-containing components.

EFFECT: increased efficiency of noise damping.

3 cl, 1 dwg

Description

The invention relates to techniques for damping the noise of compressor stations and test boxes for gas turbine engines.

The closest technical solution to the technical essence is a multi-section silencer from the book: “Designer Guide. Noise Protection ”, ed. E.Ya. Yudina, Moscow, Stroyizdat, 1974, p. 104, Fig. 7.3, containing a base, rigidly connected to the inlet pipe, and on the base there is a sound-absorbing block consisting of separate series-connected sections, each of which is made of a sound-absorbing layer material, lined with a perforated shell from the inside, and hard material from the outside, and an exhaust pipe.

The disadvantage of the prototype is the relatively low efficiency of sound attenuation.

The technical result is an increase in sound attenuation efficiency.

This is achieved by the fact that in the silencer of a multi-section compressor exhaust duct containing a base rigidly connected to the inlet pipe, and on the base there is a sound-absorbing unit consisting of separate series-connected sections, each of which is made of a layer of sound-absorbing material, lined with a perforated shell from the inside, and on the outside with hard material, and the exhaust pipe, sections of the sound-absorbing block are made in cross section perpendicular to the axis of the silencer, in the form of triangles lnika or in the form of an ellipse, and at the entrance to the inlet duct and the outlet of the outlet arranged filters catching oily components.

The drawing shows a General view of the proposed silencer.

A multi-section muffler for exhaust air ducts of compressors contains a cylindrical base 2 mounted on the base 1. It is made in the form of shells 3 and 5, between which a layer of sound-absorbing material is fixed 8. The inlet pipe 6 contains a filter 4 that traps oil-containing components. A sound-absorbing block 7 is rigidly fixed to the base, consisting of separate series-connected sections 8 and 9, each of which is made of a layer of sound-absorbing material 8, lined with a perforated shell 9 from the inside and hard material from the outside. The ratio of the internal diameter of the muffler D to the diameter of the inlet duct of muffler B lies in the range of D / B = 1.0 ... 1.5; and the ratio of the external diameter of the muffler C to the diameter of the inlet duct of the muffler B lies in the range of C / B = 1.5 ... 2.0; and the ratio of the length of the muffler section b to the diameter of the inlet duct of the muffler B lies in the range of b / B = 2.0 ... 7.0.

The indicated ranges of values are optimal for damping the noise of compressor stations and test boxes for gas turbine engines.

At the outlet of the exhaust pipe 10 of the muffler there is a filter 11 that traps oil-containing components. The sections of the sound-absorbing block are made in a section perpendicular to the axis of the silencer, in the form of a triangle or in the form of an ellipse (not shown in the drawing). Also, sections of the sound-absorbing block can be made in the form of a polygon.

A multi-section muffler for exhaust exhaust ducts of compressors works as follows.

Sound waves together with a turbulent stream of compressed air from the pipe 6 enter the cavity of sections 8 and 9 from the ZPM. An increase in the efficiency of sound attenuation occurs due to an increase in the sound absorption surface.

The elliptical profile of the silencer section helps to reduce the hydraulic resistance of the silencer due to streamlined shapes.

Filters installed at the inlet to the inlet at the outlet of the outlet also increase the efficiency of sound attenuation, because are additional elements of sound absorption.

Claims (1)

A multi-section muffler for exhaust exhaust ducts of compressors containing a base rigidly connected to the inlet pipe, and on the base there is a sound-absorbing unit consisting of separate series-connected sections, each of which is made of a layer of sound-absorbing material, lined with a perforated shell from the inside, and hard material from the outside, and exhaust pipe, characterized in that the sections of the sound-absorbing block are made in a cross section perpendicular to the axis of the silencer, in the form of a triangular Single or in the form of an ellipse, and at the entrance to the inlet duct and the outlet of the outlet arranged filters catching oily components.