SU1242245A1 - Cyclone - Google Patents

Description

The invention relates to ventilation and can be used to reduce noise in air purification systems from industrial dust.

The purpose of the invention is to reduce the radiated sound power.

FIG. 1 shows a cyclone, a general view, and a sound wave pattern for the second MODE; in fig. 2 is a view A of FIG. one; in fig. 3 - section bb pa fig. 2

The cyclone contains the lower conic part 1, the upper cylindrical part 2, the nozzle 3 for introducing the air mixture flow, the exhaust pipe 4 installed along the axis of the cyclone. Parts 1 and 2 consist of an outer sheet 5 and an inner lining 6, between which damping element 7 is placed. Exhaust pipe 4 is designed as an active silencer, which includes sound-absorbing layer 8 and protective perforated screen 9. The height of the deepening of the exhaust pipe hg is em (0,23- 0,26) Nz, where Nz is the height of the cyclone. Inside the exhaust pipe 4 placed swirl 10 made of perforated plates 11 and 12, the gap between which is filled with sound-absorbing material 13. Openings perforations 14 of the plate 11 are offset relative to the holes 15 of the plate 12 not less than the diameter of the hole.

The cyclone works as follows.

The flow of the air mixture through the nozzle 3 enters the interior of the cyclone, where it is expanded, losing speed and sound energy, after which it is directed to the exhaust pipe 4 and through it exits to the atmosphere.

Inside the cyclone, natural oscillations of air volume occur. For a closed volume in the form of a cylinder, the node of the second mode of oscillation, which determines the intensity of the low-frequency component of the sound power emitted by the cyclone, is a distance of a quarter of the wavelength from the end face, i.e. at a distance of 0.25 Nz. Since the cyclone has cylindroconic form.

Compiled by L. Tsyganov

Editor A, SaboTechred I. Veres Corrector L. Patan

Order 3645/13 Circulation 517 Subscription

VNIIPI State Committee of the SS (R

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

0

It also contains a pipe 3 and an exhaust pipe 4, then there is a laugh in it; a vibration of the oscillation unit in the range (0.23–0.26) Hz from the upper end of the apparatus. With the deepening of the exhaust pipe 4 pas distance in the range of Nb.1chnnn. 023 Nc to H5 .. 0.26 Nz, which coincides with the position of the vibration node, provides the most effective reduction of the radiated sound power.

The dust-free sunrise of the first rotating stream of air enters the exhaust pipe 4, equipped with a swirler 10, which causes an active change in the flow and leads to a decrease in air pressure pulsations. When the air flow flows along the perforated surfaces of the plates 11 and 12, a "slit effect" is realized, which ensures intensive attenuation of sound in the low and medium frequency range.

Offset of the holes 14 and 15 of the perforated plates 11 and 12, not less than the diameter of the holes, causes multiple reflection of the sound wave from the plate surfaces and interference of the direct and reflected wave, which leads to an intense attenuation of the sound in the middle frequency range.

Offset perforation plates 11 and 12

by an amount smaller than the diameter of the holes

creates the possibility of the propagation of gf mymy sound waves through holes 14 and 15

0 and reduces the effect of p Umogluc1PP1.

When sound waves penetrate into the sound-absorbing material, their attenuation occurs, which leads to a decrease in the high-frequency component of the sound waves.

The movement of the cleaned air flow inside the exhaust pipe 4 along a helical path along the plaster of the whirlwinds I) increases the contact time of sound waves with sound-absorbing no swirl 10 and exhaust pipe 4, which also contributes to the reduction of the sound sound generated .

6-B

five

five

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Claims (1)

CYCLONE, comprising a housing with a lining, consisting of a conical part and a cylindrical part with a nozzle for introducing the flow of air mixture and an exhaust pipe mounted along the axis of the housing and lined with sound-absorbing material from the inside, characterized in that, in order to reduce the radiated sound power, it is equipped with a swirl mounted inside the exhaust pipe coaxially with it, made of perforated plates with a gap between them, filled with sound-absorbing material, moreover, the perforations of the plates are displaced relative to each other th not less than by the diameter of the hole, and the depth of penetration of the exhaust pipe is 0.23–0.26 of the height of the cyclone. SU „„ 1242245 Fig. 1 I