RU2280174C1 - Exhaust silencer - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in compressor stations. Proposed silencer contains housing of round or square cross section with outer size "c" and inner size "b", intake member in form of tube with at least three holes in lower part and exhaust member made in form of louvers with size "d" in upper part of housing. Layer of noise absorber is fastened to inner surface of housing cover. At least grills with filled layer of noise-absorbing material are placed on rolled bearing structure inside housing. Filled layer has thickness "a" being made of crushed stone. Distance between upper layer of noise-absorbing material and grill of other layer is equal to "a" also. Ratios of above-indicated sizes lie in intervals of a/b=0.1-0.3 and d/b-0.4-0.7.

EFFECT: improved efficiency of noise damping.

2 cl, 1 dwg

Description

The invention relates to a technique for damping noise.

Known silencer containing a cylindrical body with an oblique exhaust cut, end inlet pipe and sequentially located in the housing sections, each of which is equipped with a central pipe and solid baffles with a conical shell (AS USSR No. 371354, F 01 N 1/00, 1971).

A disadvantage of the known technical solution is the relatively low efficiency of noise attenuation at low frequencies.

The closest technical solution in technical essence is a multi-section silencer according to RF Patent No. 2062889, F 01 N 1/00, 1994, containing a cylindrical body, an end exhaust pipe, rigidly connected to a central pipe having perforation, the perforated partitions are made in the form of coaxial located to the casing and the central pipe of an additional perforated pipe, and the ends of all pipes are rigidly connected to the casing by means of blind partitions.

The disadvantage of the prototype is the relatively low efficiency of sound attenuation due to the possibility of the occurrence of a "radiation effect" and, as a result, the penetration of sound waves both along the axis of the muffler and through its two walls.

The technical result of the invention is to increase the efficiency of sound attenuation by eliminating the "radiation effect" and the penetration of sound waves both along the axis of the muffler and through its two walls by introducing sound-absorbing elements on the propagation path of sound waves.

This is achieved by the fact that in the exhaust silencer comprising a housing, intake and exhaust elements and sound-absorbing active elements, the cross section of the housing is either square or round with an external dimension “c” and an internal “b”, and the intake element is made in the form of a pipe having at least three openings in the lower part, and the outlet element is made in the form of a “d” louvre grille in the upper part of the housing, with a layer of sound absorber attached to the inner surface of the housing cover, and on the carrier inside at least two gratings with a bulk layer of a sound absorber made of crushed stone of thickness “a” are located, and the distance between the upper layer of a sound absorber and a grating of another layer is also equal to “a”, and the ratio of the above dimensions is in the optimal range of values: a / b = 0.1 ... 0.3 and d / b = 0.4 ... 0.7.

The drawing shows a frontal section of the proposed silencer.

The exhaust silencer comprises a housing 1, intake 4 and exhaust 10 elements and sound-absorbing active elements 3. The cross-section of the housing is either square or round with an external dimension “c” and an internal “b”, and the intake element is made in the form of a pipe 4 having in the lower part there are at least three openings 6, and in front of the openings 6 there is an air filter 5 with a small resistance, for example a mesh filter. The exhaust element 10 is made in the form of a louvre grille of size “d” in the upper part of the housing, and a layer of sound absorber 13 is attached to the inner surface of the housing cover, and at least two grilles 2 with a bulk layer of sound absorber 3 from crushed stone are located on the supporting structure of rolled metal thickness "a", and the distance between the upper layer of the sound absorber and the lattice of another layer is also equal to "a". The ratios of the aforementioned silencer sizes are in the optimal range of values: a / b = 0.1 ... 0.3 and d / b = 0.4 ... 0.7. The housing 1 is based on a foundation consisting of a waterproofing layer 7 and reinforced concrete 8, and for collecting condensate from the inlet pipe 4, a drainage pipe 9 is connected to the sewer. The silencer housing can be half or more buried in the ground and made of brick.

Silencer works as follows.

Sound waves, together with a turbulent stream of compressed air, enter the cavity of the perforated pipe 4, and from it through the sound-absorbing elements 3 to the louvre grille 10. At the same time, the sound power of the compressed air jet is lost both in bulk sound absorbers 3 and in the screen sound-absorbing element 13.

The proposed design is efficient and reliable.

Claims (2)

1. An exhaust silencer comprising a housing, intake and exhaust elements and sound-absorbing active elements, characterized in that the cross-section of the housing is either square or round with an external dimension with and an internal b, and the intake element is made in the form of a pipe having a lower there are at least three openings, and the exhaust element is made in the form of a louver grill of size d in the upper part of the housing, with a layer of sound absorber attached to the inner surface of the housing cover, and on the supporting structure inside the housing and rolled arranged at least two arrays with a bulk sound absorbing bed of crushed stone and thickness, the distance between the upper layer absorber layer and another grating is also equal to a. 2. The exhaust silencer according to claim 1, characterized in that the ratio of the above dimensions is in the optimal range of values a / b = 0.1 ... 0.3 and d / b = 0.4 ... 0.7.