SU829993A1

SU829993A1 - Noise silencer

Info

Publication number: SU829993A1
Application number: SU792801321A
Authority: SU
Inventors: Юлия Дмитриевна Чурилина; Александр Сергеевич Чурилин
Original assignee: Проектный Институт "Ленжилпроект"; Ордена Ленина Лесотехническая Акаде-Мия Им. C.M.Кирова
Priority date: 1979-07-25
Filing date: 1979-07-25
Publication date: 1981-05-15

Description

1one

Изобретение относитс к технике глушени шума и может быть использовано дл глушени аэродинамического шума.This invention relates to a noise suppression technique and may be used to silence aerodynamic noise.

Известны глушители шума, содержащие кожух, тканевые разделительные перегородки, раздел ющие кожух на параллельные каналы и установленные на каркасе ПЗ.Noise silencers are known, comprising a casing, tissue dividing walls dividing the casing into parallel channels and mounted on the chassis frame.

Однако данные глупштели не обеспечивают достаточных активных потерь дл широкополосного звукопоглощени .However, these dummies do not provide sufficient active losses for broadband sound absorption.

Цель изобретени - повьшгенне зффективности шумоглушени путем обеспечени возможности нат жени и изменени шага расположени тканевых перегородок.The purpose of the invention is to improve the efficiency of sound attenuation by allowing tension and changing the spacing of the tissue partitions.

Дл достижени поставленной цели каркас выполнен в виде прутков, собранных на направл ющих в две параллельные группы, примыкающие к противоположным стенкам кожуха и установленные с возможностью перемещени прутков в направл ющих с изменением шага и вместе с направл ющие - относительно, стенок кожуха, причем тканевые перегородки размещены зигзагообразно и огибают прутки. Тканевые перегородки могут быть пропитаны демпфирующим составом с включением наполнителей например металлической стружки, а ваг расположени прутков в центре глушител может быть меньше чем ка периферии .To achieve this goal, the frame is made in the form of rods assembled on rails in two parallel groups adjacent to the opposite walls of the casing and installed with the ability to move the rods in rails with varying pitch and together with the rails relative to the walls of the casing, and the fabric partitions placed zigzag and bends around the rods. Fabric partitions can be impregnated with a damping compound with the inclusion of fillers, such as metal shavings, and the location of the bars in the center of the silencer can be less than the periphery.

Claims

Figure 1 shows the muffler; on .2 — T tension node of fabric partitions. Silencer 1: hold cover I, frame 2 and fabric partition walls 3. Frame 2 consists of two groups of bars 4.1 installed in the grooves of horizontal guides 5 that can be moved and fitted with clamping nuts 6. Horizontal guides 5 are attached to the vertical bars 7 with the help of extreme clamping nuts 6 and can be moved in the grooves of the latter to ensure tension of the fabric partitions 3. Fabric partitions, such as canvas, mesh carpets or nylon cloth, can be treated with a damping composition m with the inclusion of fillers. for example, a mixture of chalk and cement with the addition of glue and metal chips. Air flow and sound vibrations excite membrane vibrations of plates at different frequencies, which due to a large decrement of ZH5khani are extinguished, while the out-of-phase vibrations of adjacent channels of different widths contribute to attenuation, as well as the attenuation in the pores of the partitions on the roughness and in the boundary layer at the partitions due to the expense of anomalies in the pores of the partitions on the roughness and in the boundary layer at the partitions due to the expense of the anomalies in the pores of the partitions on the roughness and in the boundary layer at the partitions due to the expense of the anomalies in the pores of the partitions on the roughness and in the boundary layer at the partitions due to the expense of the anomalies in the pores of the partitions on the roughness and in the boundary layer at the partitions due to the damping and the Konstantinov effect. In addition, with the same silencer length, regardless of the flow rate and noise level, the use of the above effects makes it possible to achieve, with a change in the tension of the partitions, as well as the density of their distribution over the cross section, which means only an increase in the effectiveness of noise suppression. Claim 1. A noise silencer containing a casing of fabric partitions, a section of the casing on parallel channels and installed on a frame, characterized in that, in order to increase the efficiency of sound attenuation by allowing tension on the change in the pitch of the fabric partitions, the frame is made in the form of rods assembled on guides in two parallel groups adjacent to the opposite walls of the casing and installed with Boq the ability to move the bars in the guides with a change of pitch and together snapshots kschimi is - relative to the housing walls, and partitions fabric has a zigzag manner and encircle the bars.

2. Silencer pop. 1, characterized in that the fabric partitions are impregnated with a damping compound with the inclusion of fillers.

3. The silencer according to claim 2, in which the metal chips are used as the filler.

4. The silencer according to claims 1-3, which is based on the fact that the spacing of the bars in the center of the silencer is smaller than at the periphery. Sources of information taken into account in the examination I. USSR author's certificate 687306, cl. Р 16 L 55/02, 1978.

fi & .1

s

Nl

ut.i