SU985343A1

SU985343A1 - Multisection noise silencer

Info

Publication number: SU985343A1
Application number: SU813317146A
Authority: SU
Inventors: Александр Иванович Николаев; Жан Рахманович Рахманов
Original assignee: За витель
Priority date: 1981-06-11
Filing date: 1981-06-11
Publication date: 1982-12-30

Description

(54) МНОГОСЕКЦИОННЫЙ ГЛУШИТЕЛЬ .JVMA(54) .JVMA MULTIPLE MUFFLER

Изобретейие относитс к технике глушени шума.The invention relates to a silencing technique.

Известны многосекционные глушители шума, содержащие цилиндрический корпус с косым выпускным срезом,торцовой впускной патрубок и последовал-ельно расположенные в корпусе секции , кажда из которых снабжена центральной трубой, расположенными между последней и корпусом чередующимис перфорированными и сплошными перегородками и конической обечайкой, обращенной вершиной к впускному патрубку и перекрывающей торец центральной трубы с кольцевым боковым зазором, образующими в секции центральную и периферийные звукопоглощающие каме Ж1 1 .Multisection silencers are known, comprising a cylindrical body with an oblique discharge cut, an end inlet and subsequently placed in a section body, each of which is provided with a central tube located between the latter and the body alternating perforated and solid baffles and a conical shell with its apex facing the inlet a branch pipe and an overlying end of the central tube with an annular side gap, forming in the section a central and peripheral sound-absorbing chamber K1 1 .

Однако глушители недостаточно эффективны при низких частотах.However, silencers are not effective at low frequencies.

Цель изобретени - повышение эффективности глушени шума.The purpose of the invention is to increase the efficiency of jamming noise.

Дл достижени поставленной цели центральна труба последней по ходу потока секции выполнена открытой с торца, между ней и корпусом установлена одна перфорированна перегородка и секци дополнительно снабжена криволинейным перфорированным козырьком с переменным радиусом кривизныTo achieve this goal, the central tube of the last section along the flow is made open from the end, one perforated partition is installed between it and the body, and the section is additionally equipped with a curved perforated peak with a variable radius of curvature

перекрывающим центральную трубу с кольцевым боковым зазором со стороны косого среза и обращенным к последнему выпуклой стороной, причем площадь бокового зазора, зазоров, образованных торцом козырька с перфорированной перегородкой и со стенкой корпуса выполнена большей площади поперечного сечени впускного патрубка.the overlapping central pipe with an annular side clearance on the side of the oblique cut and facing the last convex side, the side clearance area, the gaps formed by the end of the visor with a perforated partition and with the wall of the body are made larger in cross-sectional area of the inlet pipe.

Центральна труба последней по ходу секции-и дополнительна центральна труба могут быть выполнены заодно с боковыми отверсти ми между секци ми.The central tube of the last section — and the additional central tube — may be integral with the side openings between the sections.

1515

На чертеже представлен глушитель, продольный разрез,The drawing shows a silencer, a longitudinal section,

Глушитель содержит цилиндрический корпус 1 с косым выпускным срезом, The muffler contains a cylindrical body 1 with an oblique discharge cut,

20 торцовой впускной патрубок 2 и последовательно расположенные в корпусе шумоглушащие секции 3,20 end inlet 2 and successively located in the housing sound attenuating section 3,

Кажда секци снабжена центральной трубой 4 и конической обечайкой 5, обращенной вершиной к впускному Each section is provided with a central tube 4 and a conical shell 5, with its top facing the inlet

Claims

25 a nozzle 2 and an overlying end of the central tube 4 with an annular side gap 6. In the annular gap between the tube 4 and the body 1 there are at least one pair of alternating perforated 7 and solid 8 partitions. The central tube 4, the shell 5 and the partitions 7 and 8 form the central 9 and peripheral resonant 10 sound-absorbing chambers. The central pipe 11 of the last section downstream is made open from the end at the same time as pipe 4 of section 3. Perforated partition 12 is installed between pipe 11 and case 1, and side holes 13 are made in section of pipe between partition 12 and solid partition 8 of section 3. The central tube 11 is provided with a curvilinear perforated visor 14 with a variable radius of curvature / overlapping the central tube with an annular side gap 15 on the side of the oblique cut and facing to the last convex side. The side clearance 15, as well as the gaps 16 and 17, formed respectively by the end of the visor 14 with a perforated partition 12 and with the wall of the housing 1, is made of a larger cross-sectional area of the inlet nozzle 2. . The total flow area of the holes 13 can be made equal to the total perforation area of the partition 12. The multi-section silencer works as follows. Exhaust gases, for example, an internal combustion engine, flow through inlet pipe 2 into building 1 of the silencer. Upon entry, the gas stream is divided into two parts by a cone shell 5. One part of the gas flow through the perforated partition 7 enters the resonant chamber 10. The other part of the gas flow is directed to the central sound-absorbing chamber 9. The gas flow is divided in the same way in all subsequent sections 3, Acoustic waves in chamber 10, meeting at its the path of the solid partition 8, reflected from it to the source, this reflected and incident acoustic waves, traveled different paths, occur in opposite phases, which causes the mutual amplification of wave amplitudes of the same frequency s. In addition, when gases pass through pipes, openings and silencing chambers, the loss and dissipation of acoustic energy occurs. As a result, takes place substantially. noise reduction. In the following sections, the noise reduction process is similar. During the passage of the flow through the additional central pipe 11, the part of the flow, the passage through its side openings 13, is directed to the chamber, from which it passes through the perforated partition 12 and the annular gap 17 to the atmosphere. The other part of the flow is directed to the perforated curved visor 14, partially dissipated through its perforations, and partially passing through the annular gaps 15 and 16, is superimposed on the flow coming from the partition 12. The part of the flow that passes through the perforated partition 12. dissipates It enters the atmosphere more lately than the part of the stream passing through curvilinear visor 14 due to the passage of a larger path and additional resistance. Thus, the exhaust is stretched over time, and consequently, the efficiency of noise absorption increases. At the same time, a significant role is also played by the fact that the perforated curved visor is made with a variable radius of curvature. Claim 1. A multi-section silencer comprising a cylindrical body with an oblique discharge cut, an end inlet and successively arranged sections in the body, each of which is provided with a central tube located between the latter and the body alternating perforated and solid baffles and a conical shell with its apex facing the inlet pipe and the overlapping, the end of the central pipe with an annular side gap, forming a central section in the section, and peripheral sound absorbing chambers, which are due to the fact that, in order to increase efficiency, the central tube of the latter, along the section flow, is made open from the end, one perforated partition is installed between it and the body, and the section is additionally equipped with a curvilinear perforated peak with a variable radius of curvature, overlying the central tube with an annular side gap on the side of an oblique cut and facing the last convex side, with the side gap area, the gaps formed by the end of the visor with perforated and with the second partition wall of the housing having a greater cross-sectional area of the inlet pipe. 2, the silencer according to claim 1, characterized in that the central pipe of the latter along the section and the additional central pipe are made integral with the side openings between the sections. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 371354, cl. F 01 N 1/00, 1971.